S3S4 serie VCR.pdf part of Daewoo S3 S4 Mecha Deck vcr_mech_.part1.rar, Technical Service Manual Vcr Mechanism Unit - (2.664) 2 Part File

Text preview for : S3S4 serie VCR.pdf part of Daewoo S3 S4 Mecha Deck Technical Service Manual Vcr Mechanism Unit - (2.664) 2 Part File - pag. 45

Back to : vcr_mech_.part1.rar | Home

S/M No. : S3/S4MECHA

CONTENTS
1. DESCRIPTION OF THE MECHANISM
1. CHARACTERISTIC OF THE S3/S4-DECK MECHANISM ................................................................................ 2 2. DESCRIPTION OF THE MODE.........................................................................................................................3 3. TIMING CHART OF THE S3/S4-DECK MECHANISM .....................................................................................9 4. WIRE DIAGRAM...........................................................................................................................................10

2. ARRANGEMENT AND CHECK FOR MAJOR PARTS
1. NAMES OF MAJOR PARTS..........................................................................................................................12 2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE.................................................................................14 3. JIGS AND TOOLS .........................................................................................................................................17

3. DISASSEMBLY AND REPLACEMENT
1. DISASSEMBLY OF THE DECK TOTAL ASS'Y ................................................................................................19 2. REPLACEMENT OF THE F/LOADING ASS'Y .................................................................................................21 3. REPLACEMENT OF THE S/T-REEL TABLE ASS'Y..........................................................................................22 4. REPLACEMENT OF THE PINCH LEVER TOTAL ASS'Y ..................................................................................23 5. REPLACEMENT OF THE S/T-SLANT POLE ASS'Y.........................................................................................24 6. REPLACEMENT OF THE DRUM PRICE ASS'Y...............................................................................................25 7. REPLACEMENT OF THE CAPSTAN MOTOR .................................................................................................26 8. REPLACEMENT OF THE ACE HEAD TOTAL ASS'Y .......................................................................................26 9. REPLACEMENT OF THE L/C BRACKET TOTAL ASS'Y ..................................................................................27 10. REPLACEMENT OF THE MAIN PLATE ASS'Y .............................................................................................27

4. MECHANICAL ADJUSTMENT
1. CHECK FOR THE MECHANICAL POSITION ..................................................................................................29 2. HOW TO SET MECHANICAL MODE.............................................................................................................30 3. MEASUREMENT OF THE PRESSING FORCE OF THE PINCH ROLLER ..........................................................30 4. MEASUREMENT AND ADJUSTMENT OF THE BACK TENSION .................................................................31

5. ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM
1. SCHEMATIC DIAGRAM OF THE TAPE TRANSPORTING SYSTEM...............................................................32 2. ADJUSTMENT FLOW OF THE TAPE TRANSPORTING SYSTEM..................................................................33 3. ADJUSTMENT PROCEDURES ......................................................................................................................34

6. EXPLODED VIEW OF THE DECK AND PARTS LIST
1. EXPLODED VIEW OF THE DECK ...................................................................................................................41 2. PARTS LIST...................................................................................................................................................43 3. MAJOR SPARE PARTS LIST .........................................................................................................................44

1

CONTENTS 1. DESCRIPTION OF THE MECHANISM(CONTINUED)
1. CHARACTERISTIC OF THE S3-MECHA DECK
1) S3/S4-MECHA DECK satisfies both the VHS and NTSC/PAL specifications. 2) S3/S4-MECHA DECK is driven by three motors (DRUM MOTOR, CAPSTAN MOTOR and L/C MOTOR). 3) S3/S4-MECHA DECK uses the L/C MOTOR to carry out FRONT LOADING. 4) S3/S4-MECHA DECK System has six operating Modes (EJECT, INITIAL, FF/REW, BRAKE, REVIEW and PLAY mode), and each mode is recognized by 4bits signal mode switch, which is driven by the L/C MOTOR. 5) The CST IN-PLAYING of S3/S4-Mecha is carried out after Mi-com congnizes the point light transmitted start sensor during F/L drive rack is back, When CST inserts. 6) S3/S4-MECHA DECK eliminated the deck PCB and directly connects the main PCB with the 3 main parts (1Capstan motor, L/C motor, Cam Switch) by using the board to board type connector.

2

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
2. DESCRIPTION OF THE MODES
1) EJECT MODE A. The Cassette-In/Out operation is performed in this mode. The cassette In/Out Operation is initiated by the rotation of the L/C motor to which the Front-Loading driving parts are directly related. The cassette-in operation : Cassette-in movement starts when the light transmits start sensor as F/L drive rack is back by CST inserting proper power. If there is not no copy Tap. CST-IN movement is carried out Play mode. The cassette-out operation : The Cassette Holder Assembly is located at the entrance of the Front Panel, and only the Cassette-In operation can be executed. B. Mechanical Arrangement a. The Band Brake is released from the S Reel Table. b. The S & T Sub Brake is attached to the S/T-Reel Table. c. The IDLER GEAR is attached to the S-Reel Table.

EJECT MODE

3

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
2) INITIAL MODE A. This mode is used as a reference mode for unloading location when power is off. B. The Configuration of appliance a. The BAND BRAKE is released from the S-REEL TABLE. b. The S/T SLANT POLE AS is in the unloading condition. c. The S/T SUB BRAKE is attached to the S/T REEL TABLE.

INITIAL MODE

4

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
3) FF/REW MODE A. This is the mode that conducts the fast forward winding and rewinding of tape by rotating the Capstan Motor at high speed to the clockwise and counter-clockwise direction and running the Reel Table. The BRAKE mode works when the End/Start sensor is on during the FF/REW operation, and it conducts the review and cue operation temporarily. The FF/REW mode conducts Direct operation, and when the deck stops, it transfers to the BRAKE mode. B. The configuration of appliances a. The S/T slant pole assembly is in the unloading condition. b. The Band Brake is separated from the S-Reel Table. c. The S/T Sub Brake is attached from the S/T Reel Table.

FF/REW MODE

5

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
4) BRAKE MODE A. The BRAKE mode is configured between the FF/REW mode and the Loading section. When the PLAY, STOP or EJECT button is pushed during FF/REW, S/T-Reel Table stops immediately so that it prevents the loosening of cassette tape by the law of inertia. Therefore the BRAKE mode becomes the criteria of the unloading location when the power is off. B. The configuration of appliances a. The S/T Slant Pole Assembly is in the unloading condition. b. The Band Brake is separated from the S-Reel Table. c. The S/T Sub Brake is attached to the S/T Reel Table.

BRAKE MODE

6

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
5) REVIEW MODE A. The Review Search operation is performed in this mode. This mode is obtained by pressing the REW button in the state of playing. The L/C motor is rotated until the Cam Switch detects the REVIEW mode. When the Cam Switch detects the REVIEW mode, the L/C motor is stopped and shortly afterwards the Capstan starts to rotate CCW to transport the tape in reverse. B. The Configure of appliance a. The BAND BRAKE is released from the S-REEL TABLE. b. The PINCH ROLLER is applied to the CAPSTAN SHAFT. c. The S-SUB BRAKE is released from the S-REEL TABLE. d. The T-SUB BRAKE is applied to the T-REEL TABLE.

REVIEW MODE

7

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
6) PLAY/STOP/CUE/RECORD MODE A. The PLAY/STOP/CUE/RECORD mode performs the playback and recording while moving the tape from the S-Reel Table to the T-Reel Table at a constant speed. When the Slow function is added, it can run at the PLAY mode. B. The configuration of appliances a. The Tension Pole is in the given location. b. The Band Brake is attached to the S-Reel Table to perform the Tension Servo. c. The S/T-Sub Brake is separated from S/T-Reel Table. d. The Pinch Roller is attached to the Capstan Shaft.

PLAY/STOP/CUE/RECORD MODE

8

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
3. TIMING CHART OF S3/S4-MECHA DECK

9

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
4. S3/S4-MECHA DECK WIRE DIAGRAM
1) WIRE DIAGRAM

10

1. DESCRIPTION OF THE MECHANISM(CONTINUED)
1. CHARACTERISTIC OF THE S3-MECHA DECK
2) CONNECTOR PIN ARRANGEMENT
(A) DRUM HEAD(s3/s4) (2HEAD MONO) A 1 AFM-L AFM COMM AFM-R SP-L SP COMM SP-R GND EP-R EP COMM EP-L (E) CAPSTAN MOTOR CND D.PWM D.Vcc D.FG D.PG S3 1 2 3 4 5 6 (D) DRUM MOTOR 1 2 3 4 5 6 CTL HEAD(+) CTL HEAD(-) AUDIO HEAD AUDIO HEAD GND AUDIO ERASE 1 2 3 4 5 6 7 8 GND GND C.I.LIMIT C.PWM Vcc C.FG C.F/R EVER 5V S4 7 8 9 10 (F) CAM SWITCH 1 2 FE HEAD GND 1 2 3 4 5 6 VCC(12V) CONTROL PG OUT NONCONNECT GND FG OUT (B) FE HEAD (C) ACE HEAD

4HEAD Hi-Fi

2 3 4 5 6 7 8

2HEAD

4HEAD MONO
A-1 1 2 3 4 5

9 10

VCC(5V) F/R FG-OUT CTL-REF CTL I-LIMIT VCC(12V) GND IC GND NONCONNECT

1 2 3 4

CAM A CAM B CAM C CAM D(GND)

(G) L/C MOTOR 1 2 L/C M/T(+) L/C M/T(-)

11

2. MAINTENACE AND CHECKING OF MAJOR SYSREM
1. NAMES OF MAJOR PARTS AND AREA
1) NAMES OF MAJOR PARTS

A. Top View

12

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)

B. Bottom View

13

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)
2. MAINTENANCE AND PERIODIC CHECKING TABLE OF S3-MECHA DECK
1) MAINTENANCE AND GENERAL INFORMATION A. To guarantee the perfect performance and the function of 2W-MECHA Deck and also to use the tape for the long life, you should conduct the periodic maintenance and checking. · Replacement after checking · Conduct replacement and checking without regard to the time used.

B. Cleaning of the rotary Head Drum · To clean the rotary Head Drum, wet a towel with non-water added alcohol to clean the surface of the Drum gently while rotating the Head Drum Assembly by hands slowly. (Warning : Do not clean while running the Head Drum by motor.) · Do not clean the Drum with the towel paralleling with Head tip vertically. (The Head tip is very fragile.) C. Cleaning of the Tape Transporting section Clean the tape Running Mechanism using the towel or the cotton swab wet with non-water added alcohol. D. Cleaning of the operating parts. Clean the operating parts using the towel or a cotton swab wet with non-water added alcohol. E. Checking Procedure Do maintenance and checking according to the checking table.

14

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)
2) CLEANING AND GREASING A. Cleaning a. Tape Running Mechanism (Clean it every 500 hours of actual using time.) · Tension Pole · S-Slant Pole · Ace Head · S-Guide Post · Video Head/Drum Ass'y · T-Guide Post · FE-Head · T-Slant Pole · Capstan shaft · S-Guide Roller · T-Guide Roller · Pinch Roller Since the above mentioned parts directly contact with tapes, they can be easily contaminated by dust or foreign matters. Also if they are contaminated by dust or foreign matters, they can affect the conditions of display directly and damage the tapes. Before inserting a cassette tape into the deck, make sure these parts are completely dried after cleaning with a non-water added alcohol. b. Operating Parts (Clean it every 1,000 hours of actual using time.) · S-Reel Table · Reel Belt · Capstan Fly-Wheel/Pulley · T-Reel Table · Reel Pulley B. Lubrication (Apply grease on parts every 2,000 hours of actual using time for lubrication.) · S-Reel Table Post · T-Reel Table Post · Reel Gear Post · Teeth and Surface of the Cam Gear · Main Base Area (S/T Slant Pole Ass'y and the moving area of Cassette Holder Ass'y) Apply grease on the above parts after cleaning with non-water added alcohol, but do not apply excessively.

15

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)
3) MAJOR PARTS SERVICE SCHEDULE Conduct the maintenance and the replacement of the major parts according to the below table based on the actual using time.
Maintenance period (Hrs) NAME 1000 DRUM PRICE AS CAPSTAN MOTOR L/C BRKT TOTAL AS REEL BELT IDLER PLT AS S/T REEL TABLE AS T-SUB BRAKE AS BAND BRAKE AS MAIN PLATE L-LOADING AS PINCH LEVER T/T AS ACE HEAD T/T AS FE HEAD REEL GEAR TOTAL AS 2000 3000 4000 5000

*

*

*

* * *

*

*

*

*

*
: Replacement.

*

*

: Check and replace parts if necessary.

· Warning : Do cleaning lubrication from time to time even if the deck is not used. Replace all belts every 2 years. However, the condition of belts is good enough for use, you can keep using it.

16

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)
3. JIGS AND TOOLS FOR S3-MECHA DECK
1) JIG AND TOOL LIST
NO ITEMS MODEL NTSC: SP MONOSCOPE 7KHz SP COLORBAR 1KHz PAL: SP MONOSCOPE 6KHz SP COLORBAR 1KHz DHC-602(DAEWOO) KM-300NV(K-MEDIA) KM-300RV(K-MEDIA) KM-300FF(K-MEDIA) FIG. NO REMARKS

1

ALIGNMENT TAPE

!

Adjustment & Check of Tape Running System

2

CLEANING TAPE (DAEWOO)

@

Cleaning of the Tape Running System Measurement of REEL Torque Measurement of S,T-SUB BRAKE Torque Measurement of Back Tension

#

3

CST TORQUE METER

4

DIAL TORQUE GAUGE

$

5

TENTELLOMETER

T2-H7-UM

%

6

VHS SPINDLE HEIGHT GAUGE PUSH-PULL GAUGE

TSH-V4

^ &

Measurement of the height of Reel Table Measurement of the pressure of Pinch Roller Measurement of Idler Torque Assembling & Disassembling Adjustment Adjustment

7 8 9

ABOVE 2Kg

TENSION GAUGE +,- DRIVER PATH DRIVER CYLINDER DRIVER

* a b c d

17

2. MAINTENACE AND CHECKING OF MAJOR SYSREM(CONTINUED)
2) SKETCHS OF JIGS AND TOOLS

18

3. DISASSEMBLY AND REPLACEMENT
· Warning : The disassembly of the deck mechanism should be conducted at the EJECT mode and the assembling is proceeded by reversing the order.

1. DISASSEMBLY OF THE DECK TOTAL ASS'Y (FIG. 3-1)
1) Disassemble the top cover and front panel. 2) Separate the Drum FPC ! and the FE Head Connector @ and the A/C Head Connector # from the main body. 3) Unscrew 2 of the Top Plate fixing screws % tightened with the Main Chassis $. 4) Unscrew 4 of the Deck Assembly ^ fixing screws & tightened with the Main Chassis $. 5) Disassemble the Deck Ass'y ^ from the Main Chassis $ by lifting it up but be careful not to damage any parts fixed to the main PCB Assembly.

19

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)

Figure 3-1

20

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
2. REPLACEMENT OF F/LOADING ASS'Y (FIG. 3-2)
1) Unscrew 2 of the Top Plate fixing screws @ tightened with the Main Base Press ! and separate the Top Plate # from the main body. 2) Disassemble the F/L Door Opener % after pushing the Cassette Holder Ass'y $ about 20~30 mm to the cassette-in direction(Arrow Direction). 3) Lift the right side of the Cassette Holder Ass'y $ up and disassemble it after pushing it thoroughly to the cassette-out direction(Anti-Arrow Direction) but be cautious of its distortion. 4) Turn the Shaft Holder ^ 90° to the clockwise direction and separate it from the Main Base Press !. 5) Push the Loading Lever Ass'y & to the left, and lift the right side of it up to disassemble. 6) Replace with new parts and assemble them by the reversing procedure of the disassembly.

Figure 3-2

21

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
3. REPLACEMENT OF S.T-REEL TABLE ASS'Y (FIG. 3-3)
1) Release the T-Sub Brake Spring @ connected to the Main Base Press ! from the hook. 2) Turn the T-Sub Brake Ass'y # to the counter-clockwise direction, and lift it up for disassembly. 3) Release the S-Sub Brake Spring $ connected to the Main Base Press ! from the hook. 4) Turn the S-Sub Brake Ass'y % to the counter-clockwise direction, and lift it up for disassembly. 5) Release the Tension Lever Spring ^ from the Main Base Press ! to remove the Poly Washer &, and lift the Tension Lever Ass'y * up for disassembly. 6) Disassemble the S/T-Reel Table Ass'y (&) by lifting up. However be careful not to damage the teeth of gears. 7) Replace with new parts and assemble them by the reversing procedure of the disassembly.

Figure 3-3

22

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
4. REPLACEMENT OF PINCH LEVER TOTAL ASS`Y (FIG. 3-4)
1) Push the hook area of the Cassette Cap Opener ! to the Y-axle direction and lift it up to separate from the Main Base Press @. Be cautious of breakage of Hook. 2) Disassemble the Pinch Lever Spring #. 3) Disassemble the Pinch Lever Total Ass'y % next the Poly Washer $, but be careful not to contaminate the Pinch Roller ^. 4) Replace with new parts and assemble them by the reversing procedure of the disassembly.

Figure 3-4

23

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
5. REPLACEMENT OF S,T SLANT POLE ASS`Y (FIG. 3-5)
Disassemble the Pinch Lever Total Ass'y first before the S/T Slant Pole Ass'y. 1) Turn over the deck, and unscrew 2 of the L/C BRKT Total Ass'y @ fixing screws # tightened with the Main Base Press !. And then remove the L/C BRKT Total Ass'y @ from the main body. 2) Disassemble the Reel Gear Total Ass'y ^ after removing the Reel Belt $ and the Poly Washer %. 3) Unscrew the fixing screw * for the LED Prism & tightened with the Main Base Press !, and remove the LED Prism & and the Clutch Lever (. 4) Unscrew 2 of the fixing screws 1 for the Loading Gear Bracket Ass'y ) tightened with the Cassette Guide BRKT, and then remove the Loading Gear Bracket Ass'y ) by pushing it slightly to the plus Y-axle direction. 5) Remove the Poly Washer 2 and then disassemble the Main Plate 3. 6) Disassemble the R-Loading Ass'y 4 and L-Loading Ass'y 5 in sequence. And then remove the S/T Slant Pole Ass'y (16, 17) by pushing them slightly to the minus Y-axle direction. 7) Replace with new parts and assemble them by the reversing procedure of the disassembly.

Figure 3-5

24

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
6. REPLACEMENT OF DRUM PRICE ASS`Y (FIG. 3-6)
1) Turn over the Deck Assembly. 2) Unscrew 3 of the fixing screws @ for the Drum Price Ass'y tightened with the Main Base Press !, and disassemble the Drum Price Ass'y #. 3) Replace the Drum as the Drum Price Ass'y package. The assembling is proceeded by the reversing order of the disassembling procedure. 4) Check the running conditions of tapes after replacement. If the adjustment of Running Mechanism is needed, adjust depending on the adjustment method of the Running Mechanism(Refer to the Chapter 5).

NOTES

* In disassembling the Drum Price Ass'y, pay attention to the distortion of the Leaf Spring Ass'y % within the Loading Gear Bracket Ass'y $. * Be careful not to damage the Head, not to contaminate the surface of the Drum, or not to scratch it when you repair or replace the Drum Price Ass'y. * When the playback screen is abnormal, clean the Head and check the conditions of connectors. If the playback condition does not improve after these efforts, replace the Drum Price Ass'y.

Figure 3-6

25

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
7. REPLACEMENT OF CAPSTAN MOTOR (FIG. 3-7)
1) Turn over the Deck Ass'y upside down and disassemble the Reel Belt !. 2) Turn over Deck Ass'y to the upper part and unscrew 3 of the fixing screws @ for the Capstan Motor. Disassemble the Capstan Motor # from the lower part of the Deck Ass'y.

8. REPLACEMENT OF ACE HEAD TOTAL ASS`Y (FIG. 3-7)
1) Unscrew 2 of the fixing screws $ for the ACE Head Total Ass'y, and disassemble the ACE Head Total Ass'y %. But be careful not to contaminate it. 2) Replace with new parts and assemble them by the reversing procedure of the disassembly. 3) Adjust the Running Mechanism depending on the adjusting method(Refer to Chapter 5).

Figure 3-7

26

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)
9. REPLACEMENT OF L/C BRKT TOTAL ASS'Y (FIG. 3-8)
Disassemble the Pinch Lever Total Ass'y first before disassembling it. 1) Turn over the Deck Ass'y upside down. 2) Unscrew 2 of the fixing screws ! for the L/C Bracket Total Ass'y and disassemble the L/C Bracket Total Ass'y @. 3) Replace with new parts and assemble them by the reversing procedure of the disassembly. 4) Reassembling is done by checking the assembly location of L/C Bracket Total Ass'y (Refer to Pic. 4-1) pushing the Main Plate # completely to the right side to fix it firmly in the right position.

10. REPLACEMENT OF MAIN PLATE ASS'Y (FIG. 3-8)
Disassemble the Pinch Lever Total Ass'y first before disassembling it. 1) Disassemble the L/C Bracket Total Ass'y @. 2) Disassemble the Reel Belt $ before removing the Poly Washer %. 3) Disassemble the Reel Gear Total Ass'y ^. 4) Unscrew the fixing screws * for the LED Prism & before removing the LED Prism and the Clutch Lever (. 5) Unscrew the fixing screws 1 for the Loading Gear Bracket Ass'y ) and push it slightly to the plus Yaxle direction for disassembly. 6) Disassemble the Main Plate # after removing the Poly Washer 2. 7) Replace with new parts and assemble them by the reversing procedure of the disassembly.

NOTES

* Be cautious of the distortion of the Main Plate when assembling and disassembling it. * Be careful not to contaminate the Reel Belt with oil or grease when assembling and disassembling it. * Push the Main Plate slightly to the minus X-axle direction to assemble Clutch Lever. And then stick the Main Plate fast to the right side.

27

3. DISASSEMBLY AND REPLACEMENT(CONTINUED)

Figure 3-8

28

4. MECHANICAL ADJUSTMENT
1. MECHANICAL CHECKS
Check the following before the disassembly, replacement and assembly of the Deck. 1) Check the assembling standard of the Deck Mechanism at the EJECT Mode. 2) Before and after assembling the L/C Bracket Total Ass'y, check the assembling location for the Cam Switch, the F/L Rack and the Cam Gear. (Refer to the Picture 4-1) 3) Check the assembling location of the R Loading Ass'y and L Loading Ass'y to assemble Loading Gear Bracket Ass'y. (Refer to the Picture 4-2)

Figure 4-1. The Assembly Reference of L/C BRKT TOTAL ASS'Y

Figure 4-2 The Assembly Reference of R-LOADING ASS'Y and L-LOADING ASS'Y

29

4. MECHANICAL ADJUSTMENT(CONTINUED)
2. MODE SETTING METHOD
1) Turn the power switch on while the F/Loading Ass'y is assembled. 2) When you turn the Worm Gear 2 or 3 times by manual, it starts loading and moves to the PLAY/STOP BY Mode. 3) Push any button of the mode you want to set. 4) Unplug when the mode you selected is on. 5) F/Loading Ass'y should be disassembled and assembled at the EJECT mode.

3. MEASUREMENT OF PRESSING FORCE FOR THE PINCH ROLLER
1) Gently insert a cassette tape into the deck for Loading and push the PLAY button to run the tape. 2) Connect a Push and Pull Gauge to the lower part of the Pinch Lever Total Ass'y and pull it slowly to the a direction.(Refer to Picture 4-3) 3) Check the value of the gauge when the tape stops. (Specification : 1.2 ± 0.2kg)

Figure 4-3 The Measurement of the Pressure of PINCH ROLLER

30

4. MECHANICAL ADJUSTMENT(CONTINUED)
4. MEASUREMENT AND ADJUSTMENT OF BACK TENSION
1) Insert a T-120 cassette tape that winds tape equally on the supply side and T/Up side. And push the PLAY button and wait until the operation becomes stable. (About 10 to 20 seconds) 2) Set the Tentelometer as shown in the picture 4-4, and measure the value of tension. (Specification : 20 ~ 28g) 3) When the value is out of the specification, move the spring hook as shown in the Fig. 4-4 to adjust the value of tension.

NOTES

* Make sure that the probe of Tentelometer is adequately attached to the tape. * The Tentelometer is so sensitive that it is recommended to measure about 3 times.

Figure 4-4 Measurement and Adjustment of the Back Tension

31

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM
Since the Tape Transporting System is usually set at the factory before the shipment, it is not necessary to djust or check always. However you should check and adjust the Tape Transporting System in these following cases. · There is some noise on the screen during the playback. · The tape has been damaged. · The components of the Tape Transporting System have been replaced.

1. SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM

Figure 5-1

32

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
2. ADJUSTMENT FLOW

CLEANING

Refer to page 14

REPLACEMENT

· DRUM TOTAL ASS'Y · A/C HEAD ASS'Y · PINCH LEVER TOTAL ASS'Y

PATH ROUGH ADJ.

S-GUIDE ROLLER HEIGHT ADJ. S-GUIDE POST FLANGE T-GUIDE ROLLER HEIGHT ADJ. A/C HEAD TILT ADJ. A/C HEAD HEIGHT ADJ.

PATH PRE-ADJ.

(PG)

REPLACEMENT

· S POLE BASE AS · T- POLE BASE AS · TENSION LEVER AS

LINEARITY ADJ.

ENTRANCE ENVELOPE ADJ. EXIT ENVELOPE ADJ. ENTRANCE/EXIT ENVELOPE FINE
* X-POSITION ROUGH ADJ. * ENTRANCE/EXIT ENVELOPE FINE ADJ.

AUDIO ADJ.

AUDIO TILT, HEIGHT, AZIMUTH ADJ. SP, (EP)

X-POSITION ADJ.

TRACKING CHECK

33

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
3. ADJUSTMENT PROCEDURES
1) ROUGH ADJUSTMENT OF THE TAPE PATH Insert E-160 cassette tape into the Deck and push the PLAY button. 1-1) Height Adjustment for the S/T-GuideRoller A. Make sure if the tape is folded or cracked between the tape and the upper Flange of S/T-Guide Roller and the entrance/exit side Lead Line of Drum while the tape is running. B. If there is any crack or fold on the tape, adjust for smooth run of the tape by rotating the S/T-Guide Roller. 1-2) Tilt Adjustment of the Ace Head A. Check the running condition of the tape at the Lower Flange of the Tape Guide Post(T-Side). B. If the running condition of tape is abnormal, adjust by the Tilt adjusting Screw( @ of Figure 5-2) as shown in the Figure 5-2 for a smooth run of tape.

Figure 5-2

Figure 5-3

34

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
1-3) Height Adjustment of the ACE HEAD A. Check if the gap between the lower part of tape and the lower part of CTL Head is 0.25 mm. B. If the gap is more than 0.25 mm, turn the screw to the counter-clockwise direction as ! @ # step. # step. C. If the gap is less than 0.25 mm, turn the screw to the clockwise direction as ! @

Figure 5-4

2) PRE-ADJUSTMENT OF THE PATH (ADJUSTMENT OF PG) A. Connect the Channel 1(CH1) of the Oscilloscope to TP01-3(Head Switching Pulse) and CH2 to the VIDEO OUT. And align the Tracking VR on the center. B. Playback the Stairstep Signal Tape(DN 2). C. Turn the PG Volume and adjust the gap between the Switching signal and the V-Sync signal to be 6.5H°æ0.5H.

Figure 5-5

35

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
3) ADJUSTMENT OF RF STRAIGHTNESS Connect the Channel 1(CH1) of the Oscilloscope to the TP01-2(CTL Pulse) and CH2 to the TP01-4(Envelope Wave) and EXT. Trigger to the TP01-3(Switching Pulse). And then, playback the test tape of the SP Mode. 3-1) Adjustment of S & T side A. Adjust the Tracking VR to maximize the FM signal of the test tape. B. Make the entrance and exit side Envelope Wave same as the Picture 5-6 by adjusting the S/T-Guide Roller ( % and * of Picture 5-1). 3-2) Rough Adjustment of the X-Position A. Turn the Tracking VR to align it on the center. B. Loosen the A/C Head Screws( $ & % ) of Picture 5-2 by turning about 90°~120°. C. Maximize the Envelope Wave of the Oscilloscope by turning the A/C Head Total Ass'y with a (-) driver as shown in the picture 5-2.

Figure 5-6

Figure 5-7

36

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
3-3) Fine Adjustment of Entrance/Exit side A. Check if the Envelope Wave of the Oscilloscope changes constantly while turning the Tracking VR to the CW/CCW direction. B. If the Envelop Wave of the Oscilloscope at the entrance or/and the exit side changes unsteadily as shown in the picture 5-8 and 5-9, adjust repeatedly the S/T-Guide Roller where the wave is not flat.

Figure 5-8

Figure 5-9

Figure 5-10

37

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
4) THE ADJUSTMENT OF THE AUDIO SIGNAL Before adjusting the Audio, play the tape and check if there is any fold on the tape at the lower part of the Tape Guide Post(T-side). 4-1) Tilt and Height Adjustment of the Audio A. Connect the AUDIO OUTPUT to an Audio Level Meter. B. Playback the DP-1/DN-1(Color Bar) and check the output of the AUDIO. (Specification : Minimum, Output -4.5 ~ -8.5dBm) C. If the 1MHz output is below the gauge value, adjust the Tilt and the Height of the Ace Head again according to the same method as 1-2) and 1-3). 4-2) Adjustment of the Audio Azimuth A. Play the DP-2/DN-2 tape(Stairstep: 6KHz) while connecting the AUDIO OUTPUT to an Audio Level Meter. B. Adjust to maximize the output of the Audio by turning the A/C Head Screw(@ of Figure 5-2) * Specifications · Minimum Output : -8.5 ~ -12.5dBm · The output difference between 1MHz and 6MHz : +2 ~ 4dBm · The Level variation of 6MHz Audio : within 1dBm C. Check if there is any severe fluctuation or top-down vibration of the tape between the T-Guide Roller and the A/C Head while playing the tape after adjustment. If there is any problem, readjust the Audio. D. Check the condition of the Envelope Wave after adjusting. If there is any problem, conducts the fine readjustment of the entrance and exit side according to the same procedure as 3-3).

38

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
5) ADJUSTMENT OF X-POSITION A. Connect the Channel 1(CH1) of the Oscilloscope to the TP01-2(CTL Pulse), and CH2 to the TP014(Envelope), and EXT. Trigger to the TP01-3(Switching Pulse). B. Playback the test tape of the SP Mode after aligning the Tracking VR on the center. C. Turn and adjust the A/C Head Total Ass'y with a (-) driver (refer to the picture 5-2) to make the Envelope Wave same as the picture 5-12 while turning the Tracking VR to the CW/CCW direction. D. Playback the test tape DN-2E(EP Mode)/DP-2 to check if the its directional feature is same as the picture 5-13. (There should be no major change of wave or screen noise from the CCW 4ms to the CW 6ms range of the Tracking Volume.) E. If the above said directional feature is not found, readjust from step "B". F. Check if the output of DP-2/DN-2 6KHz is maximum after adjusting the X-Position. G. If every step is acceptable, apply the lock paint to the A/C Head Screw !, @, and #.

Figure 5-11

Figure 5-12

39

5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM(CONTINUED)
6) CHECKING OF THE TRACKING ADJUSTMENT

TRACKING VR POSITION MODE TAPE USED CHECKING ITEM CCW 6ms Straightness SP DP-2 (DN-2) Noise Straightness EP DN-2E Noise None None None 4:3 None 4:3 CCW 4ms CENTER 4 : 3.5 None 4 : 3.5 CW 6ms 4:3 None 4:3

Figure 5-13

7) FINAL INSPECTION Make sure no tape wrinkle is caused at each Guide Roller and Post.

40

6. EXPLODING VIEW OF DECK AREA AND PART LIST
1. EXPLODING VIEW OF THE DECK

41

6. EXPLODING VIEW OF DECK AREA AND PART LIST(CONTINUED)

42

6. EXPLODING VIEW OF DECK AREA AND PART LIST(CONTINUED)
2. PART LIST
NO. 1 2 STOCK NO. 97SA255600 97SA268900 97SA274270 97SA280000 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 97SA255700 97SA257500 97S1800500 97SA260001 97SA256600 97S2301900 97SA25690A 97SA257200 97SA257300 97SA257400 97SA257100 97S1800600 97S2912500 97S2912600 97SA257000 97S8009500 97S2301800 97S2609201 97SA256100 97SA255800 97SA255900 97S2610800 97S2606900 97SA261700 97SA274301 97S5500500 97SA262100 97S8100700 97SA255500 97S0902700 97SA318300 97SA318400 PART NAME S-SLANT POLE AS DRUM TOTAL AS DRUM TOTAL AS DRUM TOTAL AS T-SLANT POLE AS ACE HEAD T/T AS CST CAP OPENER CST GUIDE BRKT AS PINCH LEVER T/T AS SHAFT HOLDER IDLER PLATE AS T-SUB BRAKE AS LOADING LEVER AS CST HOLDER AS S-SUB BRAKE AS F/L DOOR OPENER S-REEL TABLE T-REEL TABLE TENSION LEVER T/T AS FE HEAD FE HEAD HOLDER REC S/W LEVER LOADING GEAR BRKT AS L-LOADING AS R-LOADING AS LED PRISM LINK CLUTCH LEVER MAIN PLATE AS(S3) L/C BRKT T/T AS(S3) REEL BELT REEL GEAR T/T AS(F) CAPSTAN MOTOR MAIN BASE AS TOP PLATE(S,S2) REFLECTOR HOLDER-L AS REFLECTOR HOLDER-R AS 1 1 1 Q'TY 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RECORD MODEL RECORD MODEL RECORD MODEL NTSC PAL+NTSC PAL+NTSC REMARKS

43

6. EXPLODING VIEW OF DECK AREA AND PART LIST(CONTINUED)
3. SPARE PART LIST
NO. 1 PART NAME DRUM TOTAL AS DRUM TOTAL AS DRUM TOTAL AS 2 3 4 5 6 7 8 9 10 11 12 13-1 14 15 CAPSTAN MOTOR L/C BRKT T/T AS(S3) REEL BELT IDLER PLATE AS S-REEL TABLE AS T-REEL TABLE AS T-SUB BRAKE AS BAND BRAKE AS MAIN PLATE AS(S3) L-LOADING AS PINCH LEVER T/T AS ACE HEAD T/T AS FE HEAD REEL GEAR T/T AS(S3) STOCK NO. 97SA268900 97SA274270 97SA280000 97S8100700 97SA274301 97S5500500 97SA25690A 97SA256700 97SA256800 97SA257200 97SA313200 97SA261700 97SA255800 97SA256600 97SA257500 97S8009500 97SA262100 HVFHF0004AK CR F2QTB12 DESCRIPSION Q'TY 3 3 3 3 3 3 3 1 1 3 1 3 1 3 3 3 3 REMARKS NTSC NTSC+PAL NTSC+PAL

44