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¡ MICROLINE 3390/3391 PRINTER
Maintenance Manual

All specifications are subject to change without notice.

PREFACE
This maintenance manual describes how to maintain the Microline 3390/3391 printer in the field. This manual is for customer engineers. For further information, refer to the Users Manual for handling or operating the equipment.

iii

TABLE OF CONTENTS
1. CONFIGURATION 1.1 1.2 2. Standard Printer Configuration Options

THEORY OF OPERATION 2.1 Electrical Operation 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 2.1.6 2.1.7 2.1.8 2.1.9 2.2 Summary Microprocessor and the Peripheral Circuit Initialization Parallel Interface Control Print Control SP/LF Motor Control Operation Panel Alarm Circuit Power Supply Circuit

Mechanical Operation 2.2.1 2.2.2 2.2.3 2.2.4 2.2.5 2.2.6 2.2.7 2.2.8 Printhead Mechanism and Operation Spacing Operation Head Gap Adjusting Ribbon Drive Paper Feed Operation Paper Detection Mechanism Automatic Sheet Feed Paper Park Function

3.

ASSEMBLY/DISASSEMBLY 3.1 3.2 3.3 Precautions for Parts Replacement Service Tools Disassembly/Reassembly Procedure 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 Printhead Ribbon Protector Pull-up Roller Assy Upper Cover Assy, Access Cover Assy and Sheet Guide Assy Gear Case Assy PC Connector Space Motor, Guide Roller Assy Space Rack

i

3.3.9

Carriage Cable

3.3.10 Backup Roller Holder Assy 3.3.11 Platen Assy 3.3.12 Driver Board (SRXD) 3.3.13 LF Motor 3.3.14 Operation Panel PCB (LEOP) 3.3.15 Control/Power Supply Board (SRXC) 3.3.16 Transformer Assy 3.3.17 Change Lever and Gears 3.3.18 Carriage Shaft 3.3.19 Paper Pan 3.3.20 Rear Tractor Assy 3.3.21 Rear Pressure Assy 3.3.22 Switch Lever 4. 5. ADJUSTMENT CLEANING AND LUBRICATION 5.1 5.2 6. Cleaning Lubrication

TROUBLESHOOTING AND REPAIR 6.1 6.2 6.3 6.4 6.5 Items to Check Before Repair Troubleshooting Table Lamp Display Connection Circuit Check for Printhead and SP/LF Motor Troubleshooting Flow Chart

APPENDIX A. B. C. PCB LAYOUT SPARE PARTS LIST RS-232C Serial Interface Board (OPTION)

ii

1. CONFIGURATION

1.

CONFIGURATION

1.1. Standard Printer Configuration
This printer consists of the following assemblies:

Sheet guide assy

Platen knob

Access cover assy

Upper cover

Transformer assy Pull-up roller assy Control/Power supply assy

Driver board

Operation panel assy Main frame

Figure 1-1 Configuration

1­1

1.2

Options
(1) Cut sheet feeder unit (CSF) (Narrow and wide versions available) Dual-bin CSF Single-bin CSF

Attachment assy

(2)

Pull-tractor assy

1­2

(3)

Bottom push tractor unit

(4)

Roll paper stand (Narrow only)

(5)

Serial I/F · RS232C · RS422A · Current Loop

1­3

2. THEORY OF OPERATION

2.
2.1

THEORY OF OPERATION
Electrical Operation
The electrical operation of the printer circuit is described in this section.

2.1.1 Summary Fig. 2-1 shows the block diagram of the printer. The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors and interface connectors. The power to the control board is supplied by the power board through the connector cord. The power to other electrical parts is also distributed through the connectors within the control board. 2.1.2 Microprocessor and the peripheral circuit (1) Microprocessor (Q7: 67X640) This processor is a CMOS single-chip computer with integrated peripheral device functions and a 16 bit MPU core, all OKI original architecture. The processor has a 20 bit address bus and a 16 bit data bus. It is capable of accessing up to 1M word program memory and 1M bytes of data memory. The following characteristics are also provided: · Built-in type data memory of 512 bytes · 8-bit 4-channel A/D converter × 1 · 16-bit automatic reload timer × 2 · 8-bit serial port × 2 · 8-bit parallel port × 3 (bitwise I/O specification available) And others. The function of this microprocessor is to provide a central mechanism for the entire printer by executing the control program through the LSI and driver circuits.

2­1

67 x 640 LSI Roll paper stand ROM DRAM 4*64 Kbit*2 ParaI/F TSD EEPROM 1Kbits I/F-IPT Print-IPT Release-SW Bottom-SW PE-SENSOR OPERATION PANEL Alarm -circuit Power-off Alarm-Odd Alarm-Even SP-Alarm Serial SP alarm LF driver M SP driver Head driver Alarm-Odd Alarm-Even
(opt.) RS232CI/F

AD-BUS

(opt.) CSF

ADDRESS

12.288 MHz
16*1024 Kbits

ROM max 4M max 16M

4

AI

Vcc-Level TSD SEL-N

2­2
Reset circuit Divider 40 volt 8 volt 5 volt RESET 5VD Vcc-Level Rectifier circuit

INT

2P Encoder M SP

LF

Fuse 40 V

AC-input

Transformer

Figure 2-1

(2)

Program ROM This is a 256 × 16 bits (4M bit) [MAX] EPROM with the control program for the printer stored. The MPU executes instructions under this program. The program ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU. The following shows the operation of the memory access.

MPU A0~A17 D0~D15 PG-N

ROM

CSO PSEN

CE OE

MPU CLOCK

A0~A17 PG-N

PSEN-N Program D0~D15 Program Program

IN

IN

IN

2­3

(3)

RAM (MSM51C464A-80RS) The RAM is CMOS dynamic RAM with (64K × 4-bit) × 2 configuration, and used as buffers (such as receiving buffer, printing buffer, DLL buffer and working buffer). The following shows the examples of the memory access operation.

MPU A0~A7 P03 CS1

RAM 1 (Q3) RAM 2 (Q4) RAS CAS

D0~D3

D4~D7 RD OE

Clockout*

T1

T2

T3

A0~A7

CS1~CS4 RD

D0~D7 (Read) WRH

WRL

D0~D7 (Write)

8-bit bus, byte instruction

* Clockout is provided when the original excitation is selected.

2­4

(4)

CG ROM This is a 1024K × 16 bits (16M bits) MASK ROM with the font data for the characters stored. CG ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU. The following shows the memory access operation.

MPU A0~A19 D0~D15 CG-N

ROM

P02 PSEN

CE OE

MPU CLOCK A0~A19 CG-N

PSEN-N Program D0~D15 Program Program

IN

IN

IN

2­5

(5)

EEPROM The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and writing 1,024 bits. The EEPROM contains menu data. The following shows the memory access operation.

MPU P24 P27 P25 P26 EECLK-P EEDIN-P EECS-P EEDOUT-P

EEPROM D1 CS DO SK

PRE = O PE = X EECS-P
t CS

EECLK-P
Start code

Operation code 1 0 A5

Address

EEDIN-P

1

A0 0 D15 D0 D15 D0 D15

EEDOUT-P

Read cycle timing (READ)
PRE = O PE

EECS-P

t CS

EECLK-P
Start code Operation code 0 1 Address A5 A0 D15 Data D0

EEDIN-P

1

EEDOUT-P
twp

Bus

Ready

Write cycle timing (WRITE)

2­6

(6)

LSI This LSI detects and controls the SP motor speeds by monitoring the two phase sensor signals obtained from the DC motors and modifying the excitation phases as appropriate. This LSI is connected in multiplex to the MPU.

MPU

A/D bus

LSI

P07 RD WRL P01

ALE RDN WRL LSIC

Clockout*

A0~A19 LSICS

ALE

D0~D15 (Read) RD

Address

Data

D0~D15 (Write) WRL

Address

Data

* Clockout is provided when the original excitation is selected.

2­7

2.1.3 Initialization This printer is initialized when the power is turned on or when the I-PRIME-N signal is input from the host side via the parallel interface. For the initialize operation, the RST-N signal is first output from the reset circuit to reset the MPUs and LSIs. When resetting ends, the program starts and the LSIs are reset by MPU via LSIRST-N. Reset operation by I-PRIME starts program to initialize, but does not reset the MPU. The program here sets the mode of the LSI including the MPU, checks the memories (ROMs and RAMs), then carries out carriage homing, and determines the LF motor phase. Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F: BUSY-N signal off) and lights the SELECT lamp to inform the ready state for receiving to the host side and ends the initialize operation.

Start

MPU RESET MPU Initial Setting Internal RAM CHECK ROM CHECK LSI RESET External RAM CHECK LSI Initial Setting and I/F Busy ON RAM Clear Carriage Homing LF Motor Phase Initialization Serial I/F I/F BUSY OFF Parallel I/F I/F ACK Send

End

2­8

2.1.4 Parallel Interface Control The parallel data input from the host to the interfaced LSI is latched to its internal register at the falling edge of the STROBE-N signal. At the same time, the LSI sets the BUSY signal to the high level to inform the host that the data is being processed, and outputs the RXD signal to inform the MPU of data reception. The data is read upon receiving the RD-N signal from the MPU. When the data processing ends, the BUSY signal is set to off and the ACK-N signal in sent to request the next data. When reception is impossible because the buffer is full, the BUSY signal is sent to request stopping of data transmission.

CN1 MPU LSI Receive Data BUSY ACK-N STB-N

NBSY A/D bus ACK RXD P16 NRXD NSTB

Data 1 to 8 STROBE 500ns max. BUSY ACK

2~8µs RXD

2­9

2.1.5 Print Control Print data is transmitted as parallel data (HEAD1~HEAD24) from LSI to print head. LSI generates print timing and drive time.

Control/Power Supply Board MPU A/D bus LSI

Driver Board

Print Data HEAD1-N~ HEAD24-N

DRIVER

Print Data HEAD1~ HEAD24

Print Head

HEAD DRIVE TIMING CHART

DT1

DT2

HEAD DRIVE CURRENT

2 ­ 10

Print Compensation Control The print compensation can be made as shown below: (a) (b) (c) Voltage compensation (See 2.1.8 "Alarm Circuit.") Temperature compensation (See 2.1.8 "Alarm Circuit.") Pin stroke compensation

Platen Print Head Pin 1~4 5~20

As shown in the drawing left, the stroke length up to the platen is different for each pin.

21~24

Pin coil current Pin 1~4, 21~24

Pin 5~20 Time

(d)

Simultaneous Compensation of the number of impact pins The LSI is provided with the compensation table for each pin to make necessary compensation. Number of impact pins Drive time Few Short Many Long

2 ­ 11

(e)

Print mode compensation According to the thickness of the printing medium, the print mode is compensated as shown in the table below: Head Gap Range Print speed Drive time 1 100% 2 95% Short 3 85% 4 85% Long (Drive time lengthens at each step.) 5 80%

2 ­ 12

2.1.6 SP/LF Motor Control (1) Space Motor Control The SP motor driver (HA13412) drives the three-phase brushless motor based on the phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. The MPU can identify the current speed of the space motor by measuring through the LSI the pulse length of the output (øA, øB) of the slit encoder included in the space motor. By comparing the target speed for each print mode with the actual current speed to change the speed instruction data, the motor speed is accelerated or decelerated to maintain the specified speed for each print mode.

SPU

SPV

SPW

SP truth table HALL SPU H H H L L L AMP SPV H L L L H H INPUT SPW L L H H H L U OPEN L L OPEN H H OUTPUT V L OPEN H H OPEN L W H H OPEN L L OPEN

2 ­ 13

(2)

Encoder Disk In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated when the encoder disk interrupts the photo sensor. The LSI divides these edge pulse signals in accordance with the print pitch, and sends the IPT signal to provide dot-on timing and carriage position detection timing.

SPU SPV SPW

PHASE-A PHASE-B

1/720"

· UTILITY MODE
IPT 10 CPI 1/120" IPT 12 CPI 1/144" IPT 15 CPI 1/180" IPT 17 CPI 1/206" IPT 20 CPI 1/240"

2 ­ 14

(3)

LF Motor Control The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar, based on the phase changeover data and the output current data from the LSI. The data from the LSI is processed by a specific register contained in the LF motor driver to measure the overdrive time and to change the phase.
PHASE-A

PHASE-B [FORWARD] [REVERSE]

2 ­ 15

2.1.7 Operation Panel The clock synchronization OPCLK of LSI is used to input the switch data and output the LED data through the operation panel control LSI (IC1: BU5148S).

LSI OPTD OPCK OPTXD 77 OPCLK Command and Data latch LED Driver

78 OPCLR-N NPA2 80 OPRXD OPRD 79

+5V

Switch controller

A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the LSI (BU5148S) in synchronization with the OPCLK signal. The LSI decodes this command and when it is found to be legal, returns a 2-byte command response back to the LSI which includes data on Switch information, LED status, receive command ACK/NAK and 1 odd parity bit. Any transmission errors found cause the command to be reissued after the transmission of the OPCLR-N signal.

2 ­ 16

1
OPTXD Command (first) Command (second) bit0 bit7

2

3

2

31

6 7

5 or 8

Power ON
OPCLK

Write instruction for LSI reset
Command response (first) Note OPCLR-N

1

OPRXD

bit0

bit7 Command response (second)

LSI write for LED data, etc.

2

2 ­ 17
Reset within BU5148S

Read instruction for data read

3

4

Response check for OK or NG

NO

YES

Error notification

7

5 8

6

Instruction for retransmission

Note: From the illustration above, you can see that the command and the command response are output at the same time. This is because the bit 0 to bit 3 of OPRXD are fixed so that the response can be returned before decoding the command.

2.1.8 Alarm Circuit (1) Head drive time alarm circuit This circuit monitors the drive time using the HDALM signal interlocked with the overdrive signal of each drive circuit. If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit sends an ALARM-N signal to turn on the SCR (SO). This cause the secondary coil (40V) of the transformer to be short-circuited, causing an overcurrent to flow through the primary coil and making the AC fuse (transformer ASS) open. (2) Alarm processing when DC power is low. + 40V is converted into the POWLEV signal (0V to +5V) by R531 and R532 and input into the A/D port of the MPU to control the drive time and the print speed (pass number) of the head.
+40V R531 POWLEV R532

(a)

Head drive time The head drive time is lengthened to compensate for the amount of voltage drop by monitoring the POWLEV signal once every 500 µ sec. to control and maintain the impact necessary for each printing pin at the fixed value.

(b)

Print speed Voltage, +40V 38V or more 25V to 37V 25V or less Pass number 1 Pass 1 Pass 1 Pass Print speed 100% 100~30% 30%

2 ­ 18

(3)

Head overheat alarm The voltage of the output TSD signal of the thermistors, one of which is contained in the print head and the other in the print head driver, is monitored by the CPU/AD port to control the voltage

Temp

Stop 119°C Mode up °C ß°C Mode down

Mode and print control Mode 1 2 3 4 5 6 (7) Speed 100% 85% 70% 55% 40% 30% Stop Pass 1 1 1 1 1 1 Direction Bi Bi Bi Bi Bi Bi 1.5 Sec Stop

· When the temperature is between °C and 119°C, the mode switches sequentially to higher level. When the temperature falls below ß°C, the mode switches to lower level. · When the temperature exceeds 119°C, printing will stop. · When temperature gradient is steep, higher mode shall be specified directly.

2 ­ 19

2.1.9 Power Supply Circuit This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC.

Control Board SW Fuse Noise filter circuit Transformer

Rectifier

+40V

Rectifier

+8V

Regulation Circuit

+5V

AC10V

The uses of output voltages and signals are described below.
Voltage/signal +5V +8V + 40V AC 10V Use Logic IC/LED drive voltage Serial interface line voltage and SP motor driver Printhead, LF motor drive voltage, SP motor drive voltage Option board

2 ­ 20

2.2

Mechanical Operation

2.2.1 Printhead mechanism and operation (See Figure 2-2.) The printhead is a spring charged 24-pin driving head using a permanent magnet. It is attached to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to the control circuits through the control board.

#1

#2

#23

#24

Figure 2-2 Arrangement of the head pins View from the tip of the printhead

(1)

The printhead configuration: The printhead is composed of the following parts: (a) (b) (c) (d) Wire guide Spring assembly (Wire, Armature, Spring, Yoke, Spacer) Magnet assembly (Magnet, core, coil, Yoke) Printed circuit board

2 ­ 21

(2)

Operation of printhead (See Figure 2-3.) (a) When the printhead is idle, the armature is attracted by a permanent magnet and the spring fixing the armature is compressed. The print wires fixed to each armature are thus concealed under the wire guide. When a signal for a character to be printed is detected, a current flows through the coil. When the coil is activated, the magnetic flux (caused by the permanent magnet between the armature and the core) is canceled to eliminate the attraction force. The armature is driven in the direction of the platen by the force of the armature spring. The print wire fixed to the armature protrudes from the tip of the wire guide, strikes the paper through the ribbon and prints a dot on the paper. After the character has been printed, the armature is magnetically attracted again and the print wires are again concealed under the wire guide. A thermistor in the printhead prevents burning caused by over-heating of the coil during extended continuous bi-directional printing. When the temperature of the coil exceeds a pre-determined limit (about 119°C) the control circuit detects a thermistor signal. Printing will then be intermittent or stop completely until the coil temperature falls below the limit value.

(b)

(c)

2 ­ 22

Paper Print wire

Printhead

Platen

(1)

When printing
Paper

Armature assembly Print wire Thermistor

Wire guide Yoke Spacer Magnet assembly

(2)

When not printing
Paper

Figure 2-3

2 ­ 23

2.2.2 Spacing operation (See Figure 2-4.) The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom of the carriage frame. Items included in the spacing mechanism are as follows: (a) (b) (c) (d) (e) (f) (1) DC motor with motor gear Carriage frame (stationary yoke and motor driver board included) Carriage shaft Space rack Sensor Encoder disk

Spacing operation The carriage frame, on which the printhead and space motor are mounted, moves along the carriage shaft in parallel with the platen. When the spacing motor rotates counterclockwise, the driving force is transmitted to the motor gear. As the motor gear rotates, the carriage moves from left to right. Mechanically, it is designed in such a way that for every revolution of the DC motor, the carriage frame moves 0.8 inch (20.32 mm). At the same time the encoder disk rotates together with the motor and passes the sensor. The position of the carriage frame can be determined by counting the interrupts detected by the sensor. In the same way, the rotation of the space motor can be recognized and controlled by measuring the cycle of interrupts detected by the sensor.

2 ­ 24

Print Head Carriage shaft

Space rack Carriage frame Encoder disk Encoder sensor

Motor gear

Slider Guide rail

Figure 2-4

2 ­ 25

2.2.3 Head gap adjusting (See Figure 2-5.) The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the printhead and the platen. The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever is moved creating a fine gap adjustment. If the adjusting gear is pushed down, the adjusting screw can be turned with a screw driver to change the coarse gap adjustment. When the adjusting lever is set to range ~ the contact which is attached to the under side of the carriage cover will connect with the contact of the space motor PC board. The printer will reduce the printing speed automatically to ensure that adequate printing pressure is maintained for multipart paper. And, the adjusting cam adjusts the headgap toward left and right side in accordance with the guide rail up and down as a position of the left end of it.

2 ­ 26

Platen

Range

1 2 3 4 5
Adjusting lever Idler gear Adjusting gear Adjusting screw Printhead

Carriage shaft

Range from

5

to

1 Narrows Printhead

Adjusting screw Adjusting cam C.C.W.

Platen

Guide rail Widens

Range from

1

to

5

C.W.

Figure 2-5

2 ­ 27

2.2.4 Ribbon drive (See Figure 2-6.) The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consist of the following items: (a) (b) (c) (1) Ribbon drive gear assembly Ribbon gear (space motor) Ribbon cartridge

Ribbon cartridge An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built in to the ribbon cartridge.

(2)

Ribbon feed operation When the space motor is activated, the ribbon gear rotates. The rotation is transmitted via the ribbon drive gear assembly to the drive gear in the ribbon cartridge, thus moving the ribbon. The feed direction of the ribbon is maintained by switching the rotational direction of the gears in the ribbon drive gear assembly. This ensures ribbon movement when bidirectional printing is used.

2 ­ 28

Ribbon cartridge Drive gear

Ink tank

Figure 2-6

2 ­ 29

2.2.5 Paper feed operation Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by the LF pulse motor. Item of the paper feed mechanism are as follows: (a) (b) (c) (d) (e) Pulse motor with gears Decelerating gear Platen Tractor feed unit Pressure roller

2 ­ 30

(1)

Cut sheet and continuous sheet switching mechanism (See Figure 2-8.) Three different paper paths can be selected and set by the change lever. (a) TOP (for cut sheet) When the cut sheet is used in the manual mode or fed by the CSF (option), set the change lever at the position marked TOP. [Operation] The driving force of the platen gear (R) is transmitted to the idle gear by setting the change lever to the TOP position. However, this causes the idle gear to be disengaged from the change gear, leaving it free. At this time, the pressure rollers (at the rear and the front) are pressed securely to the platen to feed the cut sheet. At the same time, the switch lever positions between the rear switch and bottom switch, to confirm to the control board that you are in the cut sheet mode. In the cut sheet mode, the control board automatically feeds the sheet up to the print start position after pausing for the wait time stored in the menu. (b) REAR (Continuous sheet from push tractor) When the change lever is set to REAR position, the change gear is engaged with the idle gear and the tractor gear to transmit the rotation of the platen to the push tractor shaft, and the continuous sheet is fed from the push tractor. At the same time, the switch lever turns on the rear switch, to confirm to the control board that you are in the continuous sheet mode.

2 ­ 31

(c)

BOTTOM (Continuous sheet from bottom feeder) (option) When the change lever is set in the BOTTOM position, the rotation of the platen is transmitted to the drive gear of the bottom tractor feed unit through the idle gear to feed the sheet which has been set in the bottom tractor feed. At the same time, the switch lever turns on the bottom switch, to confirm to the control board that you are in the continuous sheet mode.

Correlation in Mechanism
Mechanism Lever Position Rear Switch Bottom Switch Idle Gear Change Gear Tractor Gear Sheet Insertion Manual/ automatic TOP OFF OFF Rotate Stop Stop CSF: Operation SW or instruction · Operation SW or · instruction · Operation SW or · instruction

REAR

ON

OFF

Rotate

Rotate

Rotate

BOTTOM

OFF

ON

Rotate

Rotate

Stop

2 ­ 32

Control Power supply Assy Bottom switch Switch lever Change gear shaft Rear switch

Change lever

Release shaft Change arm

TOP Platen BOTTOM Change lever

REAR

Tractor gear

Change gear Platen gear (R)

Reset spring

Idle gear (Bottom tractor unit)

Figure 2-8

2 ­ 33

(2)

Cut-sheet feeder operation (See Figure 2-9.) The pulse motor used for the paper feed mechanism is mounted on the left of the frame, and the rotation of the motor is transmitted through decelerating gears (LF idle gear, platen gear) to the platen. When using cut-sheet paper, the change lever must be in the TOP position to grab the paper, while disengaging the push tractor. When the change lever is set to the TOP position, the cut sheet is automatically fed in up to the print start position after pausing for the wait time stored in the menu.

Stepping motor (LF motor)

Pressure roller Platen

Platen gear LF Idel gear

Figure 2-9

2 ­ 34

(3)

Continuous paper feed operation (Rear) (See Figure 2-10.) The force transmitted to the platen, rotates the tractor gear through platen gear, the idler gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotate through a sheet feeder shaft, feeding the continuous paper.

Platen gear

Tractor gear

Paper

Idle gear Change gear

Figure 2-10

2 ­ 35

(4)

Push and pull tractor mechanism (Option) (See Figure 2-11). This mechanism consist of an optional pull tractor and a standard push tractor mechanism. This mechanism can perform forward and reverse feed by setting continuous sheets to the push tractor and pull tractor. The rotation of the platen is transmitted to the push tractor and the pull tractor. Sheets are fed by these two tractors at the same time. To remove slack from the sheets, set the sheets according to the following procedure when using the push and pull tractors.
1

Set the change lever to the REAR position (setting the sheets to the push tractor to feed). Set the paper, which is fed in front of the platen, to the pull tractor. Set the change lever to the TOP position and feed paper using the platen knob. If paper slack is removed, set the change lever to the REAR position.

2 3 4

Pull tractor Drive gear Idle gear Push tractor

Platen gear

Platen

Figure 2-11

2 ­ 36

(5)

Pull tractor mechanism (option) (See Figure 2-12.) Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed. The rotation of the platen is transmitted to the idle gear of the pull tractor unit through the platen gear at the left end of the platen. The rotation of the idle gear is transmitted to the drive gear, and continuous sheet forms are fed by the pull tractor being rotated through the sheet feeder shaft.

Continuous sheet form

Pull Tractor assembly

Sheet feeder shaft

Drive gear

Idle gear

LF motor

Platen Platen gear LF Idle gear

Figure 2-12

2 ­ 37

(6)

Bottom push feed operation (option) (See Figure 2-13). The bottom push feed of the continuous sheet is possible only when the bottom tractor feed unit is installed. When the platen rotates, the rotational force of the platen is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor, and the sheet of paper is fed in to the print start position.

Platen

Platen gear

Change gear

Idle gear

Tractor change gear Tractor idle gear

Tractor drive gear

Figure 2-13

2 ­ 38

(7)

Paper clamp mechanism (See Figure 2-14.) When setting the change lever to the BOTTOM , TOP or REAR position, the operation of the front release gear arm changes according to the position of the release cam. And at the same time, the position of the cam installed to the front release gear shaft changes, and the open and close of the pressure roller. Position of change lever
BOTTOM TOP REAR

Open or close of front pressure roller
OPEN CLOSE OPEN

Open or close of rear pressure roller
OPEN CLOSE OPEN

2 ­ 39

TOP
Change lever

Release cam

Platen

Change arm

BOTTOM

REAR

Figure 2-14

2 ­ 40

2.2.6 Paper detection mechanism (See Figure 2-15.) (1) Cut sheet detection When the cut sheet is inserted, the point A is pushed backward and the paper near end lever B rotates counter clockwise (CCW). At this time, the rear sensor lever rotates counterclockwise (CCW), the rear sensor lever and pulls out of the rear and top paper end sensor to detect that the sheet is provided. The procedure for the paper end is made in the reverse order, that is, its detection is performed when the paper end sensor is blocked. (2) Rear feed detection When the sheet is fed from the push tractor, the point B is pushed to the front side and the paper near end lever A rotates clockwise (CW). At this time, the rear sensor lever rotates counterclockwise (CCW), and pulls out of the rear and top paper end sensor to detect that the sheet is provided. The procedure for the paper end is made in the reverse order, that is, its detection is performed when the rear sensor lever intercepts the sensor. (3) Bottom feed detection When the sheet is fed from the bottom, the point C rotates clockwise (CW). When the bottom sensor lever rotates clockwise (CW), it pulls out of the bottom paper end sensor to detect that the sheet is provided. The procedure for the paper end is made in the reverse order, that is, its detection is performed when the bottom sensor lever intercepts the sensor.

2 ­ 41

Paper end sensor Sensor lever

A

Shaded portion

Paper end lever

B

Bottom paper end lever

Figure 2-15

2 ­ 42

(4)

Top line print mechanism (See Figure 2-16). The front edge of the sheet is protected by the ribbon protector so that it can stop at a position just near to the print head (0 tear off position) to start printing at the front end of the sheet, without causing the sheet to crumple or curl up. The printing starts at the front end of the sheet, and continues uni-directionally until the front end of the sheet gets to the inside of the pull up roller cover. After that, that printing continues bi-directionally.

2 ­ 43

Platen Ribbon protector

Printhead

Carriage frame assembly

Figure 2-16

2 ­ 44

2.2.7 Automatic sheet feed This function is used to feed in the sheet automatically up to the print start position when the cut sheet or the continuous sheet is used. [Operational procedure] (1) When using the cut sheet 1) 2) 3) 4) Set the change lever to the TOP position. (See Figure 2-17.) Insert a sheet of paper between the platen and the paper shoot. After the lapse of time selected by the "wait time" in the menu, the LF motor starts its operation to feed the sheet of paper up to the print position. When the default is selected, the sheet of paper is feed in up to the position 0.35 inches (first dot position) from the upper end of the sheet. However, the 0 tear off mechanism allows the printing at the front end of the sheet by changing the TOF position.

Sheet setting

Time out PE

Detection timer Time selected on the menu LF action

SW2 REAR TOP BOTTOM BOTTOM TOP

SW1 REAR

Figure 2-17

2 ­ 45

(2)

When using the continouos paper 1) 2) 3) 4) 5) Set the change lever either to the rear side or the bottom side position. (See Figure 2-17.) Set a sheet of paper either to the push tractor or the bottom tractor. Press the "FF/LOAD" switch. The LF motor starts its operation to feed the paper up to the print start position. The paper is fed in up to the TOF position (Factory default: 0.35 inches from the top).

Push down the "FF/LOAD" switch.

Detection of the sheet supplied

PE

LF action Line feed (about 3 inches) until the detection of the sheet supplied

When the ""FF/LOAD" switch is pushed down, the LF motor feeds in the sheet about 3 inches. When the LF motor completes the operation and the sheet has not been fed in, the feeding operating operation becomes, ineffective, thus resulting in the feeding jam.

2 ­ 46

2.2.8 Paper park function (continuous paper) Continuous sheets which have been inserted can be reversed automatically by using the "PARK" button on the operation panel. 1) 2) 3) Press the "PARK" button on the operation panel. Reverse LF is started and paper is fed in reverse until paper end occurs or 19 inches maximum have been fed. The paper is fed in reverse, to leave the paper on the push-tractor or bottom-tractor.

PARK PE

Paper end detection

LF action Reverse LF from P.E. Sensor to tractor feed assy. Reverse LF until paper end or 19 inches max.

Alarm LED lights up when P.E. is not detected after 19 inches reverse feeding. Operator can press SEL key to turn off the ALARM LED then press PARK key to continue park function. This operation is required when the length of paper for parking is more than 19 inches.

2 ­ 47

3. ASSEMBLE/DISASSEMBLE

3.

ASSEMBLY/DISASSEMBLY
This section explains the procedures for removing and installing various assemblies and units in the field. Description is mainly limited to the removal procedure; installation should basically be performed in the reverse sequence of the removal procedure.

3.1

Precaution for Parts Replacement
(1) Remove the AC cable and the interface cable before disassembling or assembling. (a) (b) Turn off the AC power switch. Remove the AC input plug of the AC cable from the receptacle. Remove the AC cable from the inlet on the printer (only 200V). To connect the AC cable again, connect it to the inlet on the printer (only 200V) first, then insert the AC input plug into a receptacle.

AC input aplug

AC receptacle

AC cable

Interface cable

(2) (3) (4) (5) (6) (7) (8) (9)

Do not disassemble the printer as long as it is operating normally. Do not remove unnecessary parts, and limit the disassembly area as much as possible. Use the designated service tools. Carry out disassembly in the prescribed sequence; otherwise, damage to the parts may result. It is advisable to temporarily install screws, snap rings and other small parts in their original positions to avoid losing them. Whenever handling the microprocessors, ROM, RAM IC chips and boards, do not use gloves which may cause static electricity. Do not place the printed circuit board directly on the equipment or on the floor. If adjustment is specified in the middle of installation, follow the instructions.

3­1

3.2

Service Tools
Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the field. Table 3.1 Service tools
No. 1 Service Tool No. 1-100 Phillips screwdriver No. 2-200 Phillips screwdriver No. 3-100 screwdriver Q'ty 1 Use Screws 2.6 mm Screws 3-5 mm Remarks

2

1

3

1

4

Spring hook

1

5

J-YX4025­83335-3

1

Head gap adjustment

6

Volt/ohmmeter

1

7

Feeler gauge

1

Head gap adjustment

8

Pliers

1

9

No. 5 nippers 1.1 lbs (500 g) bar pressure gauge

1

10

1

3­2

3.3

Disassembly/Reassembly Procedure
This section explains the assembly replacement procedures according to the following disassembly system. [Parts Layout]

Upper cover assy Transformer assy

Control/Power supply board

Printhead

Driver board

Operation panel board

Printer unit

Figure 3-1 Printer unit

3­3

[How to Change Parts] This section explains how to change parts and assemblies appearing in the disassembly diagram below.

Printer unit

3.3.1

Printhead 3.3.2 Ribbon protector

3.3.3 3.3.4

Pull-up roller assy Upper cover, access cover and sheet guide 3.3.5 3.3.6 Gear case assy PC connector 3.3.7 Space motor and guide roller assy

3.3.8 3.3.9 3.3.10 3.3.11 Platen assy 3.3.19 3.3.12

Space rack Carriage cable Back-up roller holder assy

Paper pan

Driver board (SRXD) 3.3.13 3.3.18 LF motor Carriage shaft

3.3.14 3.3.15 3.3.16 3.3.17

Operation panel PCB (LEOP) Control/Power supply board (SRXC) Transformer assy Change lever and gears 3.3.20 3.3.21 3.3.22 Rear tractor assy Rear pressure assy Switch lever

3­4

3.3.1 Printhead (1) (2) (3) (4) Open the access over. Pull up and rotate the head clamp Disconnect the printhead
2 1

to unclamp the printhead
3.

2

as shown fig. 3.3.1.

from PC connector

To install, follow the removal steps in the reverse order.

Notes on installation: (1) (2) (3) (4) Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame
4.

4

The head clamp 1 must surely be sandwiched between printhead as shown fig. 3.3.2. Be sure to check the gap between platen and printhead (See 4). Be careful not to touch the print head while it is very hot.

2

and carriage frame

1 4 2 1

2 Figure 3.3.1 2 Figure 3.3.2

4 1

3

3­5

3.3.2 Ribbon Protector (1) (2) (3) (4) Remove the printhead (see 3.3.1). Open the pull-up roller cover
1. 2.

Raise and remove the ribbon protector

To install, follow the removal steps in the reverse order.

2

1

3­6

3.3.3 Pull-up Roller Assy (1) (2) Open the access cover
1. 4

Lift up the sheet guide Assy

to remove.
4

Note: Please do after always removing the sheet guide Assy Assy 2 is installed and removed. (3) (4) Tilting the pull-up roller Assy
3. 2

when the pull-up roller

toward the front, remove from the shaft of platen Assy

To install, follow the removal steps in the reverse order.

2

3 4 1

3­7

3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy (1) (2) (3) (4) (5) (6) (7) (8) Pull off the platen knob Turn the change lever
1.

2

toward the bottom position.

Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame and twist to disengage claws of upper cover 3. Raise the front side of upper cover Assy 3 and shift toward the rear to disengage claws (6 places) (5 places for narrow type) of frame. Raise the upper cover Assy
3

to remove. toward the front to remove. to remove.

Open the access cover Assy Lift up the sheet guide Assy

4 5

To install, follow the removal steps in the reverse order.

Remark on assembly: Match the posts A at the both sides of the Sheet Guide the upper cover. Push the Guide into the Cover.
5

with the arrow marks on

5

A

4

1

3

2

3­8

3.3.5 Gear Case Assy (1) (2) (3) (4) (5) Remove the printhead (see 3.31). Remove the upper cover (see 3.3.4 (1) ­ (5)). Move the carriage Assy to right hand side, remove two screws
2. 1,

then the space motor

Disconnect a carriage cable. Disengage claws (4 places). Using a flat-blade screwdriver, push to widen the claw for easy disengagement.

(6) (7)

Remove the gear case Assy 3 in upper direction and release the carriage cable from the cable clamp of the gear case Assy. To install, follow the removal steps in the reverse order.

Note on installation: (1) (2) To assemble, align the direction of the SP motor axis Case assy.
4

with the Gear Hole of the Gear

Be sure to check, and adjust if necessary, the gap between platen and printhead (see 4-1).

4 2 1

3

3­9

3.3.6 PC Connector (1) (2) (3) (4) (5) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the gear case Assy (see 3.3.5). Remove the PC connector
1

from the space motor Assy

2.

To install, follow the removal steps in the reverse order.

Note on installation: (1) (2) Do not touch the space motor 2 or terminals of PC connector dust or foreign matters.
1.

Also, take care to avoid

After installation, check and adjust the gap between platen and printhead (see 4-1). 1

2

3 ­ 10

3.3.7 Space Motor, Guide Roller Assy (1) (2) (3) (4) (5) (6) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the gear case Assy (see 3.3.5). Remove the PC connector (see 3.3.6). Remove screw
2,

then the guide roller Assy

3

from the space motor

1.

To install, follow the removal steps in the reverse order.

Notes on installation: (1) (2) (3) (4) Do not touch the terminals of space motor matters. When installing the guide roller Assy
1. 3, 1.

Also, take care to avoid dust or foreign

push portions A and B against the space motor

When installing the space motor 1, align the face C with carriage frame 4 and push portion D against the frame. After installation, check and adjust the gap between platen and printhead (see 4-1). 4 2

C D

3

11

B

3

A

3 ­ 11

3.3.8 Space Rack (1) (2) (3) (4) (5) (6) (7) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the spring
1. 2

Disengage the claw on left side of space rack rack 2 in upper direction.

from the frame, and remove the space

To install, follow the removal steps in the reverse order.

Note on installation: (1) After installation, check and adjust the gap between platen and printhead (see 4-1).

1 2 1

2 2

3 ­ 12

3.3.9 Carriage Cable (1) (2) (3) (4) (5) (6) (7) (8) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the space rack (3.3.8). Remove two screws 1, release the driver board 2 and PCB sheet and disconnect cable from connector 3, 4, 5, 6. Remove carriage cable 7 from fasteners on frame. To install, follow the removal steps in the reverse order.
9

by lifting clamp

8,

Note on installation: (1) (2) Take care not to fold the carriage cable 7 during installation. Curve slightly the carriage cable 7 when assembling into the fasteners. Make sure that the paper end lever mounting the Driver Board.
A

will not contact the Paper end Sensor

0

when

0

A

7

2

8

6 9

2 1

5 3
Claw

7

Claw

1

4

3 ­ 13

3.3.10 Backup Roller Holder Assy (1) (2) (3) (4) (5) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the backup roller spring
2. 1,

Disengage claws (2 places) of roller holder from the carriage frame backup roller holder assy 3. (6) To install, follow the removal steps in the reverse order.

and remove the

1

Claw (2 places) 3

2

Note: Small round hole with metal tip on back up roller holder assy up when installing.

3

should be facing

3 ­ 14

3.3.11 Platen Assy (1) (2) (3) (4) (5) (6) (7) (8) Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller Assy (see 3.3.3). Remove the upper cover (see 3.3.1 (1) ­ (5)). Turn the change lever
1

to the bottom position.

Push in the lock levers 2 on both sides to unlock from the frame, then rotate them upward by 90°. Remove the platen Assy
4

from base frame.

To install, follow the removal steps in the reverse order.

2 2 2 4

1 2

3 ­ 15

3.3.12 Driver Board (SRXD) (1) (2) (3) (4) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove two screws 1, and release the driver board
4. 2

and PCB sheet

5

by lifting clamp

Disconnect all cables from driver board

2.

To install, follow the removal steps in the reverse order.

Note on installation: (1) Insert one sensor lever
3

between sensor when installing the driver board

2.

2

4 4

5

1

Sensor

1 2

2

3

3

3 ­ 16

3.3.13 LF Motor (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller Assy (see 3.3.3). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the platen Assy (see 3.3.11). Remove the driver board (see 3.3.12). Remove the left FG plate
1. 2.

Release the lock A to remove the LF motor

To install, follow the removal steps in the reverse order.

Remark on assembly: (1) Press the LF Motor Cable with a portion
A

of the Motor Plate.

Lock A

2

A

1

3 ­ 17

3.3.14 Operation Panel PCB (LEOP) (1) (2) (3) (4) (5) Remove the upper cover (see 3.3.4 (1) ­ (5)). Disconnect the cable
1

from connector

3

of Driver board

2. 4.

Disengage claws on both sides from the frame, and remove the operation panel Open claws (8 places) and remove the operation panel PCB
4. 5

from the operation panel

To install, follow the removal steps in the reverse order.

5

2

3

4 1

3 ­ 18

3.3.15 Control/Power Supply Board (SRXC) (1) (2) (3) (4) (5) Remove the upper cover (see 3.3.4 (1) ­ (5)). Disconnect two flexible cable
1. 3

from the connector
4

2

the Control/Power Supply Board
1.

Remove the cable

5

from the connector
6,

on the Control/Power Supply board
1.

Remove two screws

and remove the Control/Power Supply Board

To install, follow the removal steps in the reverse order.

Remark on assembly: (1) To mount the Control/Power Supply Board, set the change lever to the top position so that the Switch Lever 7 will not hooked on the microswitches 8. 6 3 4 5 7

8

8 2 1

3 ­ 19

3.3.16 Transformer Assy (1) (2) (3) (4) (5) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove AC inlet
1

and AC switch
3

2

from the frame guide.
4

Disconnect the cable Remove a screw
6

from the connector

on the Control/Power Supply Board
7. 9

5.

and disconnect ground cable
8

Remove two screws

and shift the transformer Assy

to the left and remove it.

6 1 8 7 2

9

3 5 4

3 ­ 20

3.3.17 Change Lever and Gears (1) (2) (3) (4) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the reset spring 1, then remove the idle gear 2, the tractor gear 4 and the change gear 5. Push back the protrusion of the Change Gear Shaft remove the change lever 3.
6

with a flatblade screw driver to

To perform mounting, follow the reverse procedure of removal.

Remark on assembly: (1) To insert the change lever into the Change Gear Shaft 4 3 1
6,

match the flat surface (D cut).

5

6 2

3

D cut

3 ­ 21

3.3.18 Carriage Shaft (1) (2) (3) Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the driver board (see 3.3.12). Remove the FG plate (L) (4) (5) Slide the carriage shaft
1 2.

to the left side (in the direction of the arrow) to remove.

To perform mounting, follow the reverse procedure of removal.

Note on installation: (1) After installation, check and adjust the gap between platen and printhead (see 4-1).

1

2

3 ­ 22

3.3.19 Paper Pan (1) (2) (3) (4) (5) (6) (7) (8) Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller assy (see 3.3.2). Remove the upper cover assy (see 3.3.4 (1) ­ (5)). Remove the platen assy (see 3.3.11). Release claws
A

.
1

Lift up the paper chute assy

and remove.

To perform mounting, follow the reverse procedure of removal.

1

A

3 ­ 23

3.3.20 Rear Tractor Assy (1) (2) (3) (4) (5) (6) (7) (8) Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller assy (see 3.3.3) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the reset spring (see 3.3.17 (3)) Remove the tractor gear Shift the drive shaft
2 1.

to the right side to remove (in the direction of the arrow).

To perform mounting, follow the reverse procedure of removal.

Remark on assembly: (1) When the Tractor Assy (L) 3 (R) 4 have been detached from the Drive Shaft, align the protrusions 5 of the Pin Tractor Wheels to the same direction before assembly. 5 4 2

3 1

3 ­ 24

3.3.21 Rear Pressure Assy (1) (2) (3) (4) (5) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the change lever and gears (see 3.3.17). Remove the paper pan (see 3.3.19). Remove the rear pressure roller Rotate the release shaft
2 1. 2.

and move it to the left to detach the release shaft

Match the Main Frame Rib A with the protrusion B of the Release Shaft. (6) (7) Remove rear pressure SP assy
3.

To install, follow the removal step in the reverse order. Note: (1) At mounting release shaft 2, pay attention to the gear engagement of release shaft 2, change arm lever 6, change gear shaft 7. (2) There are 5 Rear pressure Spring Assemblies. Use two pieces which have larger spring diameter on the right side. Use three remaining pieces on the left side (for ML3391). (3) Make sure that the Release Shaft
2

will be on top of the Support spring

4.

(4) To assemble the Release Shaft 2, make sure that the protrusion of the switch lever 5 is in the U groove of the Release Shaft 2. 3 1 2 3 A B 3 5

4

2

7 6

2

3 ­ 25

3.3.22 Switch Lever (1) (2) (3) (4) (5) (6) Remove the upper cover (see 3.3.4 (1) ­ (5)). Remove the change lever and gears (see 3.3.17). Remove the paper pan (see 3.3.19). Remove the rear pressure assy (see 3.3.21). Pull the Switch Lever toward you and remove it upward. To install, follow the removal step in the reverse order.

Remark on assembly: (1) At the time of the Switch Lever assembly, make sure that the Micro switch on the Main Board works properly. Switch lever

Switch lever

Micro switch

3 ­ 26

4. PERIODIC MAINTENANCE

4.

ADJUSTMENT
(1) (2) Be sure to carry out this adjustment with the printer mechanism mounted on the lower cover. Be sure to carry out this adjustment operation on a level and highly rigid work table (flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error.

4­1

No.

Item

Specification

Drawing

Adjustment method It shall be measured at 3 points: the left end, the center and the right end of the platen. Adjustment method (1) Gap between the platen and the print head at the left end and the right end shall be adjusted by rotating the adjust cam. (2) Set the adjust lever at the Range: 1. Press the adjust gear downward (in direction A) to push the adjust gear and the adjust gear out of mesh. (3) Adjust the gap by rotating the adjust screw in direction B or C while the adjust lever and the adjust gear are disengaged. (4) After adjustment, mark the adjust cam position with a red pen.

4­1­1 Gap between the platen and the print head 1) Parallelism justment adVariation of value at the left, the center and the right shall be less than 0.02 mm After adjustment, mark the adjust composition with a red pen. Left Right Adjust cam

Marking

2) Initial adjustment

0.41±0.03 mm

Carriage shaft Platen

Left

Center

Right

Range: 1 Range: 5 Print head

Adjust lever Adjust screw

Adjust gear Adjust cam

4­2

No.

Item

Specification

Drawing

Adjustment method Note 1) The head gap shall be measured with the change lever set to rear position. Note 2) The head gap shall be measured positioning the platen gear (R) craw on the top. Adjust screw C Note 3) Move the adjust screw in clockwise direction (in direction B) to measure.

Adjust lever A

Adjust gear

Adjust spring B

Click of platen gear R Print head Gap Adjust lever Adjust gear

Platen

Adjust cam

4­1­2 Measure variation of G a p = 0 . 7 1 gap when range is ±0.05 at the changed. range 5.

4­3

No.

Item

Specification

Drawing

Adjustment method Confirm followings.

Gap between the con- 0.3mm or more tact and the monitor Adjust lever

Make sure that the gap between the contact and the motor PCB is 0.3 mm or more.

0.3mm or more

Contact Motor PCB At the time of printing test, make sure that the contact touches the motor PCB and it becomes reduced speed mode when the adjust lever is set to range 2 and 4.

Touching

4­4

No. 4­2

Item Gap between the platen and the paper pan

Specification 1±0.5

Drawing

Adjustment method Confirm followings. (1) When the change lever is set at Friction position, the gap between the platen and the paper pan at the Bottom rear side shall be 1±0.5mm. (2) When the change lever is set at Rear or Bottom position, the gap between the platen and the paper pan at the front side shall be 1±0.5 mm.

Change lever Rear

Platen

5 0. 1± n) tio ric tf (A

5 0. 1± r, ea m ) (R otto ion B osit p

Paper pan Friction position Rear, Bottom position

Change lever 4­3 Gap between the platen and the pressure roller
(Center friction)

Bottom

Confirm followings. (1) When the change lever is set at Friction position, all the pressure rollers shall be pressed to the platen. (2) When the change lever is set at Rear or Bottom position, the gap between the platen and the pressure roller at the rear side shall be 3mm. The front pressure rollers shall be pressed to the platen.

Rear

Platen

Paper pan Front pressure roller

Pressure roller

4­5

No.

Item

Specification

Drawing

Adjustment method To confirm: The tractor gear shall rotate smoothly when the change lever is set at Friction position.

4­4­1 Rotation of the push tractor

Change lever (Center friction)

Push tractor

Tractor gear Slight backlash

4­4­2 Backlash between gears

Approx. 0.05 to 0.11 mm

To confirm: There shall be slight backlash between gears to allow smooth rotation of gears. (Backlash 0.05 to 0.11 mm)

4­6

No.

Item

Specification

Drawing

Adjustment method To confirm: Ribbon shall be fed smoothly when the carriage is moved from side to side.

4­5­1 Ribbon feed

Ribbon feeding

4­5­2 Running load to spac- 250g or less ing mechanism without a ribbon cartridge

Ribbon

To confirm: Make sure that the power is turned off at the time of measurement.

Load measurement portion

Ribbon cartridge

4­7

No. 4­6

Item Engagement of the double gear and the LF motor idle gear of the Platen Assy.

Specification

Drawing

Adjustment method To confirm: The idle gear of the LF motor and the platen gear (L) and the bias gear of the platen shall be in mesh in such way that the platen gear (L) and the bias gear rotate against each other to pinch the teeth of idle gear. The idle gear stays in mesh with the platen gear (L) and the bias gear and not locked. The bias gear and the platen gear shall be staggered by one teeth as shown in the drawing.

LF Motor idle gear

Platen gear (L)

Bias gear

Good Tension

Not good (Locked)

4­8

5. TROUBLESHOOTING FLOWCHARTS

5.
5.1

CLEANING AND LUBRICATION
Cleaning
[Cautions] 1. 2. 3. Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC Power cord from the printer. Avoid dust inside the printer mechanism when cleaning. If a lubricated part has been cleaned, be sure to apply lubricating oil to that portion after cleaning. (1) Cleaning time When the equipment operating time has reached six months or 300 hours, whichever comes first. (2) Cleaning tools Dry cloth (soft cloth such as gauze), vacuum cleaner (3) Places to be cleaned Table 5.1 lists the places to be cleaned: Table 5.1
Place to be cleaned Carriage shaft and the vicinity Paper travel surface Cleaning procedure Remove paper waste and wipe off stain, dust, ribbon waste. etc.

5­1

Carriage shaft

5­2

5.2

Lubrication
This printer is designed to be maintenance free and requires no lubrication during normal operation. However it is necessary to apply lubricant in case the printer is disassembled, reassembled, cleaned or parts have been changed. (1) Cleaning time Remarks: 1) Turn off the power before cleaning. 2) Make sure that paper dust will not fall inside of the machine. · Cleaning period: 6 months of operation or 300 hours of operation, whichever the earlier. · Cleaning points: Carriage shaft and surroundings: Paper path: Paper End Sensor (2) Lubricant · Pan motor oil (or equivalent): PM · Molicort (or equivalent): EM-30L (3) Amount of lubricant · Medium amount A : Apply three to four drops of oil, or 0.008 inch (0.2 mm) thick grease. · Small amount B (4) Areas to Avoid
No. 1 2 Do not lubricate Platen assembly (rubber face) Pressure roller (rubber face) Carriage shaft Ink ribbon image Pin tractor Flexible cable and crack Motor PCB Connector terminals Reason To prevent stained paper and illegal paper feed. To prevent stained paper Pay attention not to put the grease on the rubber face of the pressure roller. Remarks

Remove paper and ribbon dust. Clean stains and dusts. Remove the dust on the Sensor.

: Apply one drop of oil (0.006±0.002 g)

3 4 5 6 7 8

To stabilize carriage traveling load To prevent blurring of print To prevent stained paper To prevent loose connection To prevent loose connection To prevent loose connection

5­3

6. SPARE PARTS LIST

6.
6.1

TROUBLESHOOTING AND REPAIR
Items to Check Before Repair
(1) (2) (3) (4) Check the inspection items specified in the instruction manual. Find out as many details of the trouble as possible from the customer. Inspect in the conditions as close as possible to those at the time the trouble occurred. Proceed with the repair as follows: Check the trouble status according to Table 6.1 for the details of the trouble. Then, locate the trouble position according to the detailed flowchart. (5) Carry out a thorough test after the repair to check for correct functioning.

6.2

Troubleshooting Table
Table 6.1
Status Trouble Contents · Power is not supplied. Trouble upon power on · No spacing operation Troubleshooting Flowchart No. 1 2 Surmise of Trouble Control/Power Supply Board, Driver Board, Transformer Assy. Space Motor, Carriage Cable, Printhead. Space Motor, Carriage Cable, Control/Power Supply Board, Driver Board, Spacing Mechanism Pressure Roller Mechanism, Pull Up Roller Cover. Printhead, Driver Board, Space Motor, Carriage Cable Printhead, Ribbon Feed Assembly, Driver Board Ribbon Feed Assembly, Space Motor, Driver Board LF Motor, Platen Assy, LF Mechanism, Driver Board Operation Panel, Driver Board Driver Board, (I/F Board), I/F Cable, Menu Setting

· Homing does not end normally.

3

· Paper jam while paper insertion · Smearing/Missing dots · Faint or dark print Trouble during printing · Ribbon feed trouble · Line feed trouble · Malfunction of switch on operation panel · Data receiving failure

4 5 6 7 8 9 0

6­1

6.3

Lamp Display
(1) Printer mode display Table 6.2

ALARM CATEGORY

LED CONDITION ALARM ALARM Paper end alarm ON SEL OFF MENU -- 10CPI -- 15CPI -- From, cut sheet or bottom paper end Change lever is set to TOP position while paper is already inserted from rear or bottom. CONTENTS

TROUBLE SHOOTING Set New paper. · Set the lever to specified position. · Check rear sensor lever. · Replace Control Board · Remove the paper or check feed Mechanism · Press SEL key. · Wait until it is cooled. · Replace P.H. or Driver Board · It is recovered automatically · Replace SP motor or Driver Board See Table 6.3.

Paper change lever alarm

ON

OFF

--

BLINK 1

OFF

OPERATOR ALARM

Paper jam alarm

ON

OFF

--

OFF

· Cut sheet could not be BLINK ejected. 1 · Cut sheet could not be fed properly -- Print head temperature exceeds 119°C Temperature of space motor exceeds specified value. Hardware Alarm has occurred.

Print Head thermal alarm Space motor thermal alarm FATAL ALARM

OFF

--

BLINK 1 BLINK 1 OFF

--

OFF BLINK 2

--

--

--

OFF

See Table 6.3

Note: BLINK1 : 400ms ON, 400ms OFF BLINK2 : 200ms ON, 200ms OFF -- : LED is kept in Current Condition (no change)

(2)

Fault alram display When the printer detects any of the various alarm states, the information is displayed as shown below on the operation panel. The alarm is specified by lamp combination of PRINT QUALITY and CHARACTER PITCH. (See Table 6.3 for details.)

PRINT QUALITY SEL SEL MENU EXIT POWER LF SHIFT
Micro Feed Down LQ COURIER
­ ROMAN ­

GOTHIC BOLD
­ SWISS ­

FF/LOAD
Micro Feed Up

TEAR

PARK

QUIET TOF

UTILITY

PRESTIGE

CHARACTER PITCH
10 12 20 15 PROP

GROUP ALARM

ITEM

SET MENU

PRINT
RESET

17

Figure 6-1

6­2

(3)

Fatal Alarm

Table 6.3 (1/2)

LED DISPLAY
ALARM PROP UTILITY PRESTIGE BOLD

ALARM CATEGORY
10 12 15 17 20

ALARM REMARKS Read/write error Check sum error Read/write error Check sum error No reaction when MPU reads data MPU is locked up and it ios reset after 65ms. NMI port of MPU is kept low level. FFFF data is detected due to MPU locked up. Read/write error Check sum error Read/write error No reaction from serial I/F board : LED Blink (200ms ON, 200ms OFF) : LED Lights up

TROUBLESHOOTING Replace Control/ Power Supply Board

MAIN CONTROL ALARM

MPU internal RAM alarm Program ROM alarm RAM on Control Board alarm

CG ROM alarm

EEPROM alarm

6­3

WDT (Watch Dog Timeout) alarm

FIRMWARE DETECTION NMI signal alarm ALARM

BRK instruction alarm MPU internal RAM alarm

Replace ROM or Control/Power Supply Board Replace Control/ Power Supply Board Replace Control/ Power Supply Board Replace Control/ Power Supply Board Turn the power OFF and ON or replace Control/ Power Supply Board Turn the power OFF and ON or replace Control/ Power Supply Board Replace ROM or Control/Power Supply Board Replace I/F Board Replace ROM on I/F board or I/F Board Replace I/F Board Replace I/F Board or Control Board.

SERIAL ROM alarm INTERFACE RAM on I/F board ALARM alarm

I/F not mounted

Table 6.3 (2/2)

LED DISPLAY
ALARM PROP UTILITY PRESTIGE BOLD

ALARM CATEGORY
10 12 15 17 20

ALARM REMARKS
Space IPT is not occurred within in specified timing. Print head does not reach to the home position.

TROUBLESHOOTING

Spacing alarm

SPACING ALARM

Print Head homing alarm

· Replace space motor. · Replace P.H. cable. · Replace Control/ Power Supply Board · Check the mechanisms if load is too much. · Check the Pl.H. connection. · Replace Print Head. · Replace P.H. cable. · Replace Control/Power Supply Board

6­4

Print Head A/D alarm

Thermister is open, short with 0V or short with +5V.

PRINT HEAD ALARM

Print Head Gap A/D alarm

Print Head Gap Signal open

· Replace P.H. cable. · Replace Space Motor Assy. · Replace Control/Power Supply Board

: LED Blink (200ms ON, 200ms OFF) : LED Lights up

Operation panel board

Centro-connector

Driver board AC connector

Switch

Transformer

6­5
LF motor

Print head

Control/Power Supply Board

Space motor

6.4

Connection Circuit Check for Printhead and SP/LF Motor
(1) Printhead

Signal
CN1
FG HD1 HD3 HD9 HO11 COM COM HD17 HD19 HD21 HD22 HD20 HD18 COM COM HD12 HD10 HD4 HD2 TH FG HD5 HD7 HD13 HD15 COM COM HD23 HD24 COM COM HD16 HD14 HD8 HD5 TH 1 2 3 4 5

Connector pin number

1 1

#1 2 #3 2

#1 #3

1

#5 2

#5

1

#7 2

#7

6 7 8 9 10
1 #13 1 #9

#9 2

1

#11 2

#11

#13 2

11 12 13 14 15 16
1 #23 1 #15

#15 2

1 1

#17 2 #19 2

#17 #19

1

#21 2

#21

#23 2

17 18 19 20 21
1 1 1 #2

#2 2 #4 2

#4

#6 2 #8 2

#6 #8

22 23 24 25 26 27 28 29 30
1 1 #14 1

1 1

#10 2 #12 2

#10 #12

#14 2

1

#16 2 #18 2

#16

#18

31 32 33 34 35 36
1
1 #20

#20 2

1 1

#22 2 #24 2

#22 #24

Thermistor (Typ.: 5k ohm)
2

6­6

(2)

Line Feed Motor Resistance of each coil should be about 7.6. Signal Connector pin number
CN6

LF1

LF2

LF3
LF motor

LF4

6­7

(3)

Space Motor Resistance of each coil should be about 5. Signal
CN2

Connector pin number

SP-U SP-V SP-W SPA SPB + 5V EL

3 5 2 SP Motor

20 10 11 18 200 R1

øA øB DA Vcc DK G

6­8

6.5

Troubleshooting flow chart
1 Power is not supplied. Is the AC cable connected correctly? Yes No Connect the AC cable correctly. Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown? No Yes Replace fuse (with same type and rating). Remedied? No Yes End Does DC + 8V out? No Yes Remove Print Head. (Turn power off, then on.) Remedied? No Yes End Replace carriage cable or ribbon feed mechanism. Remedied? No Yes End Replace Control/Power Supply Board Remove CN3 on Driver Board Measure for any short circuits between + 5V, + 40V, + 8V, 0V (EL or EP). Any short circuit? No Yes

6­9

No Yes Replace Driver Board. Replace Transformer Assy. Remedied? No Yes End Replace Control/Power Supply Board. CN2 20············1 Driver Board

Pin No. Signal

19 18 17 16 15 14 13 10 9 EP AC EL +8V +40V (F.G) 10V (0V)

20

8

7

6

5

+5V

6 ­ 10

2

No spacing operation

(The alarm LED Blinks)

Is carriage assembly binding or jammed? No Yes Check around space motor to repair the mechanism of space rack, back up roller, ribbon feed mechanism, and carriage frame etc. Replace space motor assy. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace carriage cable.

6 ­ 11

3

Homing does not end normally Yes No Check around space motor to repair the mechanism. (Space rack, ribbon feed assembly back up roller, carriage frame, support protector and ribbon protector.) Remedied? No Yes End Replace space motor assy. Replace space motor assy. Remedied? No Yes End Replace carriage cable Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace Control/Power Supply Board

6 ­ 12

4

Paper jam while paper insertion Jam 1

Check the ribbon protector. Check the pull up roller cover is closed properly.

Pull up roller cover

Platen

Ribon Protector

Paper

Jam 2 (wrinkled paper)

Check around pressure roller mechanism. · · · Front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not. Tension of all of front pressure rollers is properly. Make sure of the fitting position of change gear shaft, change arm shaft and release shaft are correct.

6 ­ 13

5

Smearing/Missing Dots Does ALARM LED blink and display alarm? No Yes See Tables 6.2 and 6.3 for troubleshooting information. Replace print Head. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace carriage cable or space motor assembly.

6 ­ 14

6

Faint or dark print Is the print head gap set properly? Yes No Adjust the print head gap (see section 5) Remedied? No Yes End Replace print Head. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace ribbon feed mechanism

6 ­ 15

7

Ribbon feed trouble Remove the ribbon cartridge. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Change ribbon cartridge. Remove ribbon feed mechanism. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Replace ribbon feed mechanism Replace space motor assy.

6 ­ 16

8

Line feed trouble Turn the power off, and rotate the platen manually. Does the platen rotate smoothly? Yes No Is the platen gear (L) broken? No Yes Replace platen assembly Is the LF motor idle gear broken? No Yes Replace the LF motor assembly or LF idle gear. Is the platen gear (R), idle gear or change gear broken? No Yes Replace the gear. Set change lever to the rear position. Does the platen rotate smoothly? No Yes Replace tractor feed assembly. Replace LF motor assembly. Replace LF motor assembly. Remedied? No Yes End Replace Driver Board

6 ­ 17

9

Malfunction of switch on operation panel Is the CN1 of operation panel connected to the CN3 on the Driver Board? Yes No Connect the cable properly. Replace operation Panel Board Remedied? No Yes End Replace Driver Board

6 ­ 18

0

Data receiving failure Is the SEL LED blinking? No Yes Printer went into the print suppress mode. Wait until printer to receives DC1 code, or change the menu item "Print suppress-Ineffective" when the function is not required. Is the I/F RS2