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Q995/V995
Multiscanning Color Monitor



TECHNICAL SERVICE MANUAL
Q995/V995 Technical Service Manual


Safety Precaution
WARNING
Service should not be attempted by anyone unfamiliar with the necessary precautions on this
monitor.
The followings are the necessary precautions to be observed before servicing.
1. Always discharge the high voltage to the CRT conductive coating before handling the CRT.
The picture tube is highly evacuated and if broken, glass fragments will be violently
exploded. Use shatter proof goggles and keep picture tube away from the bare body while
handling.
2. When replacing a chassis in the cabinet, always be certain that all the protective devices are
put back in place, such as nonmetallic control knobs, insulating covers, shields, isolation
resistor capacitor network etc.
3. Before returning the monitor to the customer, always perform an AC leakage current check
on the exposed metallic parts of the cabinet, such as signal connectors, terminals, screw
heads, metal overlays, control shafts etc, to be sure the monitor is safe to operate without
danger of electrical shock. Plug the AC line cord directly into a AC outlet (do not use a line
isolation trasformer during this check.). Use an AC voltmeter having 1500 ohm per volt or
more sensitivity in the following manner : Connect ground(water pipe, conduit, etc.) and
the exposed metallic parts, one at a time. Measure the AC Voltage across the combination
of 1500 ohm resistor and 0.15 capacitor. Reverse the AC plug at the AC outlet and
repeat AC voltage measurements for each exposed metallic part. The Voltage must not
exceed 0.3 volts RMS. This corresponds to 0.2 milliamp AC. Any value exceeded this limit
constitutes a potential shock hazard and must be corrected immediately.

AC VOLTMETER




0.15µF

Place this probe
Good earth ground on each exposed
such as the water 1500 ohm metallic part.
pipe, conduit, etc 10 WATT 0.15µF



INSTRUCTIONS TO USER
This equipment generates and uses radio frequency energy and if not installed and used
properly, that is, in strict accordance with the manufacturer's instruction, may cause
interference to radio and television. It has been tested and found to comply with the limits for
the specifications in Subpart J of Part 15 FCC Rules, which are designed to provide reasonable
protection against such interference in a residential installation. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures.
· reorient the receiving antenna
· relocate the computer with respect to the receiver
· plug the computer into a different outlet so that computer and receiver are on different
branch circuits.

--1--
X-Ray Radiation Precaution
1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid
such hazards, the high voltage must be under the specified limit. The nominal value of the
high voltage of this monitor is 25KV 1.0KV at zero beam current(minimun brightness)
under a 120V AC power source. The high voltage must not(under any circumstances)
exceed30KV. Each time a monitor requires servicing, the high voltage should be checked.
It is recommended the high voltage be recorded as a part of the service record. It is
important to use an accurate and reliable high voltage meter.
2. This monitor is equipped with a protection circuit which prevents the monitor from
producing excessively high voltage. Each time the monitor is serviced, the protection
circuit must be checked to determine that the circuit is properly functioning.
3. The only source of X-RAY RADIATION in this monitor is the picture-tube.
For continued X-RAY RADIATION protection, the replacement tube must be exactly the same
type tube as specified in the parts list.
4. Some parts in this monitor have special safety-related characteristics for X-RAY RADIATION
protection.
For continued safety, parts replacement should be undertaken only after referring to the
product safety notice.


RODUCT SAFETY NOTICE
Many electrical and mechanical parts in this monitor have special safety-related
characteristics.
These characteristics are often not evident from visual inspection.
Replacement parts which have these special safety characteristics are identified in this
manual; electrical components having such features identified by " ! " in the replacement
parts list and schematic diagram.
For continued protection, replacement parts must be identical to those used in the
original circuit.
The use of substitute replacement parts which dose not have the same safety
characteristics as the factory recommended replacement parts shown in this service
manual, may create shock, fire,
X-RAY RADIATION or other hazards.



PRODUCT CDRH NOTICE
Electrical potentiometers which is marked as caution " ! " in parts list are crititial
components of safety & CDRH.
Therefore, for continued protection, replacements parts must be used it which is used in
original PCB ASS'Y.




--2--
Q995/V995 Technical Service Manual


General Information
1. Description
This 19"(18" viewable) color display monitor is operated in R, G, B, drive mode input.
2. Operating instructions
2-1. External instructions
2-2. Front
Power LED,Power Switch, menu key, Select Key, UP/Down Key
2-3. Rear
Signal : 15 Pin D-Sub,
Power : 3-pole receptacle
2-4. Service Instruction(internal controls)
Focus,Screen
2-5. OSD Controls
Contrast, Brightness, H/V-Position, Pincushion, Trapezoid, Paralleogram, Pincushion
Balance, Pin-Corner Top, Pin-Corner Bottom, Rotation, H/V-Linearity, Color adjust,
Language, Information, Degauss, H/V-Moire, Recall
3. Electrical Characteristics
3-1. 100-240 Volt 60Hz/50Hz for use all over the world.
This power supply is a 85 Watt(TYP.) multi output SMPS for monitor.
3-2. Video
Input : 0.7V p-p analog signal(at 75 ohm terminated)
Bandwidth : 202.5MHz(Max. Dot Rate)
Polarity : Positive
3-3. Horizontal Drive
Level : TTL High : 2.4V min . Low : 0.4V max
Polarity : Negative or Positive
Frequency : 30KHz ~ 95 KHz
Sync on Green (Option)
Polarity : Negative
Sync Level : 280 mV min
3-4. Vertical Drive
Level : TTL High : 2.4V min . Low : 0.4V max
Polarity : Negative or Positive
Frequency : 50Hz~150Hz
4. Model Description.
TCO'03
CRT Type No: V995 M46QCEXXXXXXX
Q995 M46QCKXXXXXXX




--3--
Control Desciption
Front View
- Q995




LED Indicator Power Switch




- V995




Power Switch / LED Indicator




--4--
Q995/V995 Technical Service Manual


Video Input Signal
Recommended signals are shown below.
63
· Video Signal 700mV
Video Level : 0 to 700mV 62
Polarty : Positive 61 · Signal: 64 level gray scale
Video Input : RGB separated
60 · Linear stepping:
Analog level
(11.1mV-64 Steps)
Sync input : H-Sync ; TTL level 59
V-Sync ; TTL level
· Waveform
Video input(R, G, B) 4
3
2
1
0



· H-Sync · V-Sync

ACTIVE (4) ACTIVE (4)




Front Porch Period (T1) Front Porch (T5) Back Porch (T3)
(T5) Period (T1)
Back Porch (T3) Sync Width (T2)
Sync Width (T2)




--5--
· Timing Table
Horizontal Dot 720 800 1024 1024 1280 1280 1600
Frequency kHz 31.469 53.674 60.023 68.677 79.976 91.146 93.75
Period(T1) µs 31.778 18.631 16.66 14.561 12.504 10.971 10.677
Sync Width(T2) µs 3.813 1.138 1.219 1.026 1.067 1.016 0.948
Back Porch(T3) µs 1.907 2.702 2.235 2.201 1.837 1.422 1.501
Active(T4) µs 25.422 14.222 13.003 10.836 9.481 8.127 7.901
Front Porch(T5) µs 0.636 0.569 0.203 0.508 0.119 0.406 0.316
Blanking Time µs 6.356 4.409 3.657 3.725 3.022 2.844 2.766

Vertical Line 400 600 768 768 1024 1024 1200
Frequency Hz 70.087 85.061 75.029 84.997 75.025 85.024 75.000
Period(T1) ms 14.268 11.756 13.328 11.765 13.329 11.761 13.333
Sync Width(T2) ms 0.064 0.056 0.05 0.044 0.038 0.033 0.032
Back Porch(T3) ms 1.080 0.503 0.466 0.524 0.475 0.483 0.491
Active(T4) ms 12.711 11.179 12.795 11.183 12.804 11.235 12.800
Front Porch(T5) ms 0.413 0.019 0.017 0.015 0.013 0.011 0.011
Interlaced ms 1.557 0.577 0.533 0.582 0.525 0.527 0.533
H N N N N N N N
Sync Polar
V -/+ +/+ +/+ +/+ -/- +/+ +/+
Interlaced Y/N 28.3 56.2 78.7 94.5 135.0 157.5 202.5




The monitor is compatible with additional modes within the specified frequency ranges
provided that they are different at least for one of the following :
Horizontal Freq.: 1.1kHz
Vertical Freq.: 1Hz


Note: Even if the monitor detects the input timing as a factory preset mode, the size
Note: Even if the monitor detects the input timing as a factory preset mode, the size and
position position may not be able to be set as desired. Check the input timings are under
and
the specificationsto be adjust the image as you want. timings are under the
may not be able and set as desired. Check the input
specifications and adjust the image as you want.
For better quality of display image, use the timing and polarity shown in the table above.
For better quality of display image, use polarity shown
Please see your video card user's guide to ensure compatibility.
Please see your video card user's guide to ensure compatibility.




--6--
Q995/V995 Technical Service Manual


Video Input Terminal
A 15 Pin D-sub male connector is used as the input signal connector.
Pin and input signals are shown in the table below.

Pin Description

SIGNAL SEPERATE
PIN NO. SYNC

1 RED
2 GREEN
3 BLUE
4 N.C
5 DDC RETURN
6 RED GROUND
7 GREEN GROUND
8 BLUE GROUND
9 +5
10 LOGIC GROUND
11 GROUND
12 SDA
13 H-SYNC
14 V-SYNC(VCLK)
15 SCL


D-Sub male connector


1 2 3 4 5
6 7 8 9 10
11 12 13 14 15




--7--
Connecting With External Equipment
Cautions
Be sure to turn off the power of your computer before connecting the monitor.

- Q995




--8--
Q995/V995 Technical Service Manual


- V995




--9--
Theory of Operation
1. Power Supply
The AC voltage is from 90 ~ 264Vac.
The conducted noise is filtered by Line filter(LP1), Coil(LP2), X and Y
Capacitor(CP01,CP02,CP03.CP14).
NTC1 reduces the inrush current.
Bridge diode BD1 converts AC to DC.
And this DC voltage is charged CP04.
The STR-F6654 is a hybrid IC with a built in control IC and MOSFET.
The start-up circuit starts and stops the operation of the control IC by detecting the voltage
appearing at the VIN (PIN4)
At start-up of the power supply, CP08 is charged though the start-up registor RP09.
When the VIN(PIN4) voltage reaches 16V, the control circuit starts operation by the function
of the start-up circuit.
(In normal state, VIN of ICP01 is supplied by CP08's dc voltage. In OFF MODE, VIN of ICP01 is
supplied by CP11's dc voltage.)
The switching frequency is locked to Horizontal scan frequency by horizontal flyback pulse
from sync trans transfomer(TP02).
The output pulse width is controled by current of OCP/F.B (PIN1)
The SMPS output has 200V, 80V,-12V,6.3V, 16V
Theory of Circuit Operation
Micro Controller System
The micro controller system is composed of the MCU, the serial E2PROM, key control circuit.

The MCU (ICM01, WT62P1) mainly provides the following functions:
1) Detect the system input signals and send proper control signals via general purpose I/O
pins.
2) Output 4 PWM's to adjust the voltage controlled functions such as Brightness, Rotation, H-
Linearity,ACL.
3) Control the following characteristics of the deflection IC TDA4841 and the video pre-amp
KA2506 via I2C bus:
a. TDA4841:
· H-Phase (H-Position), H-Size
· V-Size, V-Position
· Pincushion, Pin-Balance
· Trapezoid, Parallelogram
· H-Corner Top, Bottom
· H-PinBal
· H/V-Moire
· H-Linearity
· V-Linearity
· H-Focus
b. LM1247:
· Contrast
· R,G,B gain
· R,G,B cut-off
4) Monitor the level of ADC input ABL and then send the proper contrast setting in LM1247
to achieve the beam current limitation .
5) Set and detect the key board status and implement the One-Touch-Control function via
ADC input KEY and encoder signals.
6) Provide the DDC1/2B interface to PC system.

The serial E2PROMle memory device to reserve the fixed monitor parameters, the factory
alignment result, the user adjusting result, the user defined timing characteristics,etc.




--10--
Q995/V995 Technical Service Manual


DPMS Mode
The power supply supports DPMS function. Its operation is shown in the below table.

H/V H MCU V MCU
MODE 205V -12V 80V 16V 6.3V
-Sync 39 40

NORMAL O/O 197V -12V 80V 16V 6.3V H H

STAND-BY X /O O O O O O L H

SUSPEND O /X O O O O O H L

OFF X /X O O O O O L L


Microcontroller
CS Control table

CS1 CS2 CS3 CS4
H-Freq.
[kHz] QH09 QH19 QH11 QH13
Pin30 Pin29 Pin28 Pin27

31-36k ON ON ON ON
36-40k ON OFF OFF ON
40-44k OFF ON ON ON
44-51k OFF ON ON OFF
51-55k OFF ON OFF ON
55-62k OFF ON OFF OFF
62-66k OFF OFF ON ON
66-72k OFF OFF ON OFF
72-85k OFF OFF OFF ON
85-95k OFF OFF OFF OFF




--11--
High Voltage Control Circuit:
High Voltage Control Circuit is working basically by using switching theory with the main
component ICF01 (KA3843). Circuit operating theory is explained as following:
1) When Power ON and the Vcc DC level of pin7 of ICF01 (KA3843) exceeding 8.4V, ICF01
starts to work and the oscillate frequency is decided by RF04, CF04.
2) When ICF01 is working normally the output square wave of pin6 will turn on QF01. The
ON/OFF cycle of QF01 will make the primary of FBT(pin 1~2) acted like a Switching
Power Thansformer.
3) AFC signal is differential by CF05, RF06 and connected with CF04 in order to force ICF01 in
synchronization. Then, the high voltage will be always synchronized with horizontal
deflection.
4) Usually loading change will cause unstable condition, so a high voltage feed back system
is designed to maintain the stability of the high voltage circuit. This feed back system is
started from voltage sensor on the pin12 of the FBT. This sensor voltage compares with
voltage of the OP1 via the buffer(OP2) of LM358 and returns to ICF01.
LM358 OP1 is controlled by following factors:
1) A feed back reference high voltage circuit that consists of RF21,VRF01 and RF20 to adjust
the high voltage.
2) During the period the horizontal frequency is changed, for example, H-UnLock will be
from low to high (the time frequency changes). H-Unlock is controlled by pin 17 (H-
UnLock) of ICH01 TDA4841. After differential circuit that consists of RF24 and RF05, the
signal will turn QF03 on when frequency changed and reduce the high voltage by
paralleling with RF21,VRF01 and RF20.
X-RAY High Voltage Protection CRT
X-RAY High Voltage Protection CRT is to get a DC level voltage by utilizing the output
waveform of FBT's pin4 to pin9(GND) via a rectifier consists of DH18, CH45. This DC level
voltage inputs to the pin2 (X-RAY) of ICH01 TDA4841 The preset X-RAY protection voltage is
6.3V. If the high voltage is higher than the preset voltage, the DC level voltage input into the
pin2 will also be higher than 6.3V.
It also means the HD signal is off, then horizontal deflection is off and the high voltage is also
off.
Video-Amplifier/On-Screen-Display
The video amplifier system is consist of the Pre-Amplifier, the Video-Power-Amplifier, and the
Cutoff-Voltage-Adjusting circuits.
The functions of the Pre-Amplifier ICC01(LM1247) include:
1) The small signal video amplifier controlled by MCU via I2C bus for the features of
contrast(main gain control), 3 sub cut-off controls(R Cut-off, G Cut-off, B Cut-off),
clamping pulse source and the clamping pulse width.
2) The H-Blanking signal is sent to the pin24 of ICC01.
To turn off the Horizontal scan Line during horizontal retrace period.
The Video-Power-Amplifier ICC03 is a 3-channel hybrid-IC which functions as a cascade type
transistor amplifier to reach the high bandwidth performance.
The Cutoff-Adjusting circuit consist of ICC04 is to provide the function of dark/background
white-balance control by varying the peak voltages on the CRT cathodes. ICC03(LM2465)
serving as the OSD generator outputs the R,G,B,FBKG(FBLK) signals that contain the
information by which the MCU shows the monitor's status and the user adjusting indications.
The R,G,B,FBKG signals are synchronized by the horizontal and vertical deflection sync input
on Pin24 and Pin1. The MCU controls the OSD via the signals,SDA,SCL on Pin 11,12.




--12--
Q995/V995 Technical Service Manual


Horizontal Deflection B+ Control Circuit
H/V Processing circuit
H/V Processing IC TDA4841 is I2C-autosync deflection controller for PC monitor.
All functions are controllable by I2C-bus.
The TDA4841 provides syncronization processing, horizontal and vertical synchronization
with full autosync capability.
HSYNC(Pin15) is the input horizontal syncronization signals, which can be DC-coupled TTL
signals and AC-coupled negative-going video sync signals.
The IC generates the drive waveforms for DC-coupled vertical boosters such as TDA4841 and
KA2142
The TDA4841 provides extended functions e.g. as a flexible B+ control, an extensive set of
geometry control facilities, and an combined output for horizontal and vertical focus signals.
External power components are given a great deal of protection.
The X-ray protection input X-Ray (Pin2) provides a voltage detector with a precise threshold.
In normal state, the pin2 voltage is about 5.3V. If incresing the high voltage, pin2 voltage is
increased. When pin2 voltage exceeds about 6.3V, TDA4841 is forced into protection mode.
In this mode several pins are forced into defined states:
HUNLOCK is flouting
Horizontal output stage (HDRV) is flouting
B+ control driver stage (BDRV) is flouting
CLBL provides a continuous blanking signal
The supply voltage of the IC must be switched off for a certain time, before the IC can be
restarted again using the standard power-on procedure.
Horizontal Drive /B+ Drive circuit
H/B+ Drive signal (square pulse) is generated from ICH01 pin 8,6.
The H Drive signal is switching QH05. and H-drive trans amplify QH06's base drive current.
B+ Drive signal is amplified by push pull (QH02, QH03) amplifier, this amprified signal the
switching B+ voltage is supplied horizontal deflection coil though coil(TH02)

Change the Brightness level by controlling the G1.
1) In normal working condition, the G1 waveform is synchronized with the vertical sync.
Since the purpose is to blank the vertical flyback scanning line when vertical is flyback, so
the Clamp/Blanking pulse of ICH01 pin16 through QH10 is used to control it.
2) Brightness control is via the control at pin36 of ICM01(HMS97C7134K) and through the
control at QF04 and QF05 to control the DC level of G
Focus CRT
Dynamic Focus is used to get perfect focusing of each dot on the screen.
There are
H-Focus and V-Focus:
ICH01 Pin 32 outputs a parabolic waveform (H+V Focus).
QH17 amplify this focus signal.
Vertical Deflection CRT
Vertical deflection Saw-tooth waveform is provided by ICH01 pin12, 13 (Vout1, 2) and Vout1,
Vout2 is input to Vertical Amplified IC(KA2142) Pin 1,10
This Signal is Amplified by ICV01(KA2142) and output via out pin6 of KA2142




--13--
Trouble Shooting
Symptom Check 1. (OK NO ) Check 2. (OK NO ) Action

1. No power 1) Check CP04 voltage 1) Check FP01 (short?) Change
2) Check BDP01 (diode test) Change
3) Check input voltage
2) Check ICP01 1) Check RP09 Change
(1) Check #4 (Vcc) (=16V) 2) Check Change
DP04,DP09,DP03,DP02,QP02

(2) Check #1 wave form 1) Check DP06 (diode test) Change
Check ICP06 Change

(3) Check #3 wave form Change ICP01 (#3 dead) Change


(4) Check TP01

2. No high voltage 1) Check 80V (DP22 anode) 1) Check no power Change
2) Check 80V line
CRT B/D ICC04,QC01

2) Check TH05 1) Check LF01,ICF01 open
#2 voltage (80V)
3) Check ICF01 #6 wave form 1) Check ICF01 #7(Vcc 12V) Check 12Vline
2) Check ICF01 Change
4) Check QF01 gate wave 1) Check RF08 Change

5) Check TH05 #1 wave form
1) Check DF02,DF03,CF09,QF01 Change

6) Check TH05
3. No deflection 1) Check QH06 base wave 1) Check ICH01 #8 wave form 1) Check ICH01
2) Check QH05 Gate waveform 1) Check QH06
2) Check 12VB line
3) Check QH05 Drain wave form 1) Check QH06
2) Check16V line
1) Check LH01,RH27 1) Check QH01,02,03
2) Check QH04 Source wave
form 2) Check QH02 Emitter wave 2) Check 12VB line
form
3) Check QH04
4) Check DH02, 03




--14--
Q995/V995 Technical Service Manual


Symptom Check 1. (OK NO ) Check 2. (OK NO ) Action

4. No video 1) Check ICC01 video output 1) Check ICC01 CLP input 1) Check ICM01 #31(CLP)
(ICC1 #19,20,21 wave (ICC01 #23) 2) Check CNM01 cable
form)
2) Check ICC01 BLK input 1) Check TH03 #7 wave
form
(ICC01 #24)
2) Check CNM01 cable
3) Check QC01, QC02
3) Check ICC01 dead

2) Check ICC03 video input 1) Check ICC04,LC04,LC05,
(ICC3 #6, 7, 9) LC06

3) Check ICC03 video output 1) Check ICC03 VCC(#4, #8) 1) Check 12VB,80V Line
(ICC3 #1, 2, 3) 2) Check ICC03 dead
4) Check R, G, B cathode 1) Check ICC04 #6,7,8
wave form 2) Check DC13~15
3) Check ICC01 #14,15,16

5 ) Check heater voltage Check DP25 Check 6.3v line




--15--
Adjustment Method
1. Caution
Extremely high voltage are present in the area around the FBT and the anode high voltage
lead.
Do not touch QF01 or its heatsink as high voltage is present on these components.
2. Equipment Required
Digital Voltmeter
Frequency Counter : about 40 Hz to 106KHz
Color Analyzer
Video Signal Generator
High Voltmeter : up to 30 KV
3. Before Adjustment
Verify that the video output level is 0.7 Vpp at 75 ohm termination and the video timings
are same as standard timing given in specification. Place the AC power switch to the ON
position.
Allow the monitor to stabilize thermally for 20 minutes at least before any adjustment about
the image parameters. The CRT tube and components of system require time of stabillizing.
4. Adjustment Procedure
4-1 Voltage setting
1) High Voltage Setting
- Video Signal : Black pattern in 93kHz, 1600 mode
- Set the G2 controls to the minimum position.
- Measuring Point : PF01
- Adjustment : VRF01, main board
- Limits : 140 ± 1V
2) Screen Voltage Setting
- Video Signal : Back raster pattern in 93kHz, 1600 mode
- Measuring Point : G2 on the CRT board (use High Voltmeter)
- Adjustment : Screen VR (lower VR or FBT)
- Limits : 570 ± 10V
4-2 Rotation setting
- Video signal : Cross Hatch pattern in 93kHz, 1600 mode
- Adjust the tilt of screen by using the Menu Key.




--16--
Q995/V995 Technical Service Manual


4-3 Color setting
Adhere color Analyzer sensor closely to CRT center.
Video mode : 93kHz, 1600 mode.
1. Color Temperature 9300°K setting
- Select " 9300 " by using the menu key.
1) Cut-off Setting
· Video signal : Back Raster Pattern
· Adjust the brightness to 2.0 0.5 cd/m2 by using the Up/down key.
· Press the Up/down key to get the desired R, G or B Cut-off.
· Press the Up/down key to limit the x and y color coordinate.
· Limits : x=0.283 0.02, y=0.297 0.02, Y=2.0 0.5 cd/m2
2) Drive Setting
· Video signal : 2" square white box
· Select the "9300" by pressing the menu key.
· Adjust the brightness go to 80~100 cd/m2 by using the Up/down key.
· Press the Up/down key to get the desired R or B drive.
· Press the Up/down key to limit the x and y color coordinate.
· Limits : x=0.283 0.02, y=0.297 0.02, Y=80~100 cd/m2
3) Contrast Setting
· Adjust the brightness of 2" square white box by using the Up/down key in
contrast.
· Limits : 150 +/- 5 cd/m2
2. Color Temperature 6500K Setting
- Select " 6500 " by using the menu key and Up/down key.
1) Cut-off Setting
· Video signal : Back Raster Pattern
· Select "Cutott" by pressing the Up/down key
· Adjust the brightness to 2.0 0.5cd/m2. by using the Up/down key.
· Press the Up/down key to get the desired R, G or B Cut-off.
· Press the Up/down key to limit the x and y color coordinate.
· Limits : x=0.313 0.03, y=0.329 0.03
2) Drive, contrast Setting
·The method of Adjust is same to 9300°K.
·The color coordinate is x=0.313 0.03, y=0.329 0.03, Y=80~100 cd/m2
3. ABL Setting
- Video signal : Full white
- Select "ABL" by using the menu Key and Up/down key.
- Adjust the brightness to 108+/-2 cd/m2 by rotating the Adjust dial.
4-4 Focus
Video Signal : Full "H" character pattern in93kHz.
Adjust H/V Focus VR on the top of the FBT so that the image of whole screen looks
clear.




--17--
. X-Ray Protection Test
- In any signal input condition, short RH03 (main board) by using the JIG.
- At this moment, check out whether raster disappears.
- Remove the JIG.
- After the power switch of the set off and on, check out proper working
5. AGING and Self Test Mode
The monitor has an enhanced level of self-diagonostics.
When the signal cable is removed or signal isn't detected, the monitor is operated to OFF-
Mode.
If Function Button is pushed on OFF-Mode, the system has the ability to generate an R.G.B
test pattern and the following OSD image is displayed on screen.
Note
1) Until press information Icon in main menu, the monitor is operated burn-in mode(full
white pattern)display.




NO SIGNAL




2) After press information Icon in main menu, the monitor display random BOX pattern.



NO SIGNAL




--18--
Q995/V995 Technical Service Manual


Specifiaction
Q995
19"(viewable size : 18")
Picture tube Horizontal Dot pitch 0.20 mm
Anti-Static, anti-glare, TCO treatment coated.
Display area factory preset area : 352 x 264 mm
Number of color Infinite
Input signals R.G.B Analog, 15 pin D-sub
Frequency rate Horizontal : 30 to 96kHz, Vertical : 50 to 150Hz
Maximum bandwidth 202.5 MHz
Maximum resolution [email protected]
Input voltage 100 - 240 VAC, 2.5 A
Power consumption 90W (Typ.)
Power Management VESA DPMS
Lower than EPA recommendation
Plug & Play
VESA DDC 1/2B
H/V SIZE, H/V POSITION, PINCUSHION, TRAPEZOID, PARALLEL,
PIN BALANCE, H/V- MOIRE, TOP CORNER, BOTTOM CORNER,
OSD menu H/V LINEARITY, LANGUAGES, ROTATION, OSD H/V POSITION,
COLOR CONTROL, RECALL, INFORMATION, DEGAUSS,
BRIGHTNESS, CONTRAST
Ergonomics, TCO, FCC Class B, CE, VCCI,
Safety and EMC cTÜVus, CB, TÜV, FIMKO, SEMKO
Operating Temperature 0 ~ 40O C
Weight 20.0 Kg unpacked, 23.5 Kg packed
Dimensions (W X H X D mm) 436 X 431 X 456 mm

· Specification is subject to change without notice for performance improvement.




--19--
V995
19"(viewable size : 17.7")
Picture tube Horizontal Dot pitch 0.22 mm
Anti-Static, anti-glare, TCO treatment coated.
Display area factory preset area : 352 x 264 mm
Number of color Infinite
Input signals R.G.B Analog, 15 pin D-sub
Frequency rate Horizontal : 30 to 96kHz, Vertical : 50 to 150Hz
Maximum bandwidth 202.5 MHz
Maximum resolution [email protected]
Input voltage 100 - 240 VAC, 2.5 A
Power consumption 90W (Typ.)
Power Management VESA DPMS
Lower than EPA recommendation
Plug & Play
VESA DDC 1/2B
H/V SIZE, H/V POSITION, PINCUSHION, TRAPEZOID, PARALLEL,
PIN BALANCE, H/V- MOIRE, TOP CORNER, BOTTOM CORNER,
OSD menu H/V LINEARITY, LANGUAGES, ROTATION, OSD H/V POSITION,
COLOR CONTROL, RECALL, INFORMATION, DEGAUSS,
BRIGHTNESS, CONTRAST
Ergonomics, TCO, FCC Class B, CE, VCCI,
Safety and EMC cTÜVus, CB, TÜV, FIMKO, SEMKO
Operating Temperature 0 ~ 40O C
Weight 19.0 Kg unpacked, 22.0 Kg packed
Dimensions (W X H X D mm) 446 X 461 X 457 mm

· Specification is subject to change without notice for performance improvement.




--20--
Q995/V995 Technical Service Manual


Critical Parts Specification
LM2479
MC68HC705BD7B


120V Triple Bias Clamp
General Description · High input impedance
The LM2479 is an Integrated 120V triple bias clamp circuit
· Single supply operation
for DC recovery of each of the AC coupled outputs of a CRT · Matched to the LM126X family of preamplifiers
driver. It is well matched with the DAC outputs of the
LM126X family of pre-amplifiers. Each amplifier has its gain Recommended Applications
internally set to -18. The IC is packaged in an industry · CRT monitors requiring DC restoration at the cathodes
standard 8 lead molded DIP package.

Features
· Wide range integrated triple bias clamp

Block Diagrams Package Pinout




DS101391-2

FIGURE 2. LM2479 Package Pinout
Order Number LM2479NA
NS Package Number: N08E




DS101391-1

FIGURE 1. Simplified Schematic (One Channel)




--21--
Absolute Maximum Ratings (Note 1) ESD Tolerance, Machine Model 200V
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/ Limits of Operating Ranges (Note 3)
Distributors for availability and specifications.
VCC 110 to 125
Supply Voltage, VCC +130V VOUT, VCC = 120V 50 to 120V
Input Voltage, VIN 0V to 5V Ambient Temperature Range, TA 0
0 to 70!C
0 0
Storage Temperature Range, TSTG -65!C to +150!C
Lead Temperature (Soldering,
< 10sec.) 0
300!C


DC CLAMP ELECTRICAL CHARACTERISTICS TARGETS AND LIMIT
Unless otherwise noted: VCC = +120V, VIN = 2.25VDC, TA = 25!C.
Symbol Spec Parameter Conditions Min Typ Max Units
ICC Supply Current All channels 2.3 3.5 mA
VOUT DC Output Voltage 83 87 91 VDC
VOUT-Range Output Voltage Range VIN Range = 1.0V - 4.0V 53 V
AV DC Voltage Gain -16 -18 -20
LE Linearity Error See Note 1 5 %
RIN Input Resistance 24K
Note 1: Linearity Error is the variation in DC gain from VIN = 1.0V to VIN = 4.0V.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 3: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
the test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may
change when the device is not operated under the listed test conditions.
Note 4: All voltages are measured with respect to GND, unless otherwise specified.



Test Circuit




DS101391-3

FIGURE 3. Test Circuit (One Channel)

Figure 3 shows the test circuit for evaluation of the LM2479 Clamp Amplifier. A high impedance VM ( > 100M) is used for DC
measurements at the output.




--22--
Q995/V995 Technical Service Manual


LM1247
MC68HC705BD7B

General Description - I2C compatible microcontroller interface
- OSD override allows OSD messages to override video
The LM1247 pre-amp is an integrated CMOS CRT preamp. and the use of burn-in screens with no video input
It has an I2C compatible interface which allows control of all
- 4 DAC outputs (8-bit resolution) for bus controlled CRT
the parameters necessary to directly setup and adjust the
bias and brightness
gain and contrast in the CRT display. Brightness and bias
can be controlled through the DAC outputs which are well - Spot killer which blanks the video outputs when VCC
matched to the LM2479 and LM2480 integrated bias clamp falls below the specified threshold
ICs. The LM1247 preamp is also designed to be compatible - Suitable for use with discrete or integrated clamp, with
with the LM246x high gain driver family. software configurable brightness mixer
Black level clamping of the video signal is carried out directly - Horizontal blanking and OSD synchronization directly
on the AC coupled input signal into the high impedance from deflection signals. The blanking can be disabled, if
preamplifier input, thus eliminating the need for additional desired
clamp capacitors. Horizontal and vertical blanking of the - Vertical blanking and OSD synchronization directly from
outputs is provided. Vertical blanking is optional and its deflection signals. The blanking width is register
duration is register programmable. programmable and can be disabled, if desired
The IC is packaged in an industry standard 24 lead DIP - Power Saving Mode with 65% power reduction
molded plastic package. - Matched to LM246x driver and LM2479/80 bias IC's


Features Applications
- Internal 512 character OSD ROM usable as either (a) - Low end 15" and 17" bus controlled monitors with OSD
384 2-color plus 128 4-color characters, (b) 640 2-color - 1024x768 displays up to 85 Hz requiring OSD capability
characters, or (c) some combination in between - Very low cost systems with LM246x driver
- Internal 512 character RAM, which can be displayed as
one single or two independent windows


Internal Block Diagram




20048401



FIGURE 1. Order Number LM1247AAG/NA
See NS Package Number N24D




www




--23--
Absolute Maximum Ratings (Notes 1, 3)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage VCC, Pins 10 and 18 6.0V ESD Susceptibility (Note 4) 3.0 kV
Peak Video DC Output Source Current ESD Machine Model (Note 13) 350V
(Any One Amp) Pins 19, 20 or 21 1.5 mA Storage Temperature 65 Cto +150 C
Voltage at Any Input Pin (VIN) VCC +0.5 VIN 0.5V Lead Temperature (Soldering, 10 sec.) 265 C
Video Inputs (pk-pk) 0.0 VIN 1.2V
Thermal Resistance to Ambient ( JA) 51 C/W Operating Ratings (Note 2)
Power Dissipation (PD)
(Above 25 CDerate Based Temperature Range 0 Cto +70 C
on JA and TJ) 2.4W Supply Voltage VCC 4.75V VCC 5.25V
Thermal Resistance to case ( Video Inputs (pk-pk) 0.0V VIN 1.0V
JC) 32 C/W
Junction Temperature (TJ) 150 C

Video Signal Electrical Characteristics
Unless otherwise noted: TA = 25 C,VCC = +5.0V, VIN = 0.70 VP-P, VABL = VCC, CL = 8 pF, Video Outputs = 2.0 VP-P. Setting
numbers refer to the definitions in Table 1. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
Symbol Parameter Conditions Min Typ Max Units
IS Supply Current Test Setting 1, both supplies, no
195 250 mA
output loading. See (Note 8).
IS-PS Supply Current, Power Save Test Setting 1, both supplies, no
55 85 mA
Mode output loading. See (Note 8).
VOBLK Active Video Black Level Output Test Setting 4, no AC input signal, DC
1.2 VDC
Voltage offset (register 0x8438 set to 0xd5).
VOBLKSTEP Active Video Black Level Step Test Setting 4, no AC input signal.
100 mVDC
Size
VO Max Maximum Video Output Voltage Test Setting 3, Video in = 0.70 VP-P 4.0 4.3 V
LE Linearity Error Test Setting 4, staircase input signal
5%
(see (Note 9)).
tr Video Rise Time (Note 5), 10% to 90%, Test Setting 4,
3.1 ns
AC input signal.
OSR Rising Edge Overshoot (Note 5), Test Setting 4, AC input
2%
signal.
tf Video Fall Time (Note 5), 90% to 10%, Test Setting 4,
2.9 ns
AC input signal.
OSF Falling Edge Overshoot (Note 5), Test Setting 4, AC input
2%
signal.
BW Channel bandwidth ( 3 dB) (Note 5), Test Setting 4, AC input
150 MHz
signal.
VSEP10 kHz Video Amplifier 10 kHz Isolation (Note 14), Test Setting 8. 60 dB
VSEP10 MHz Video Amplifier 10 MHz Isolation (Note 14), Test Setting 8. 50 dB
AV Max Maximum Voltage Gain Test Setting 8, AC input signal. 3.8 4.1 V/V
AV C-50% Contrast Attenuation @50% Test Setting 5, AC input signal. 5.2 dB
AV Min/AV Max Maximum Contrast Attenuation Test Setting 2, AC input signal.
20 dB
(dB)
AV G-50% Gain Attenuation @50% Test Setting 6, AC input signal. 4.0 dB
AV G-Min Maximum Gain Attenuation Test Setting 7, AC input signal. 11 dB
AV Match Maximum Gain Match between Test Setting 3, AC input signal. ± 0.5
dB
channels
AV Track Gain Change between channels Tracking when changing from Test
Setting 8 to Test Setting 5. See (Note ± 0.5 dB
11).




--24--
Q995/V995 Technical Service Manual


Video Signal Electrical Characteristics (Continued)
Unless otherwise noted: TA = 25 C,VCC = +5.0V, VIN = 0.70 VP-P ABL=V CC L = 8 pF, Video Outputs = 2.0 VP-P Setting
,V ,C .
numbers refer to the definitions in Table 1. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
Symbol Parameter Conditions Min Typ Max Units
VABLTH ABL Control Range upper limit (Note 12), Test Setting 4, AC input
4.8 V
signal.
VABLRange ABL Gain Reduction Range (Note 12), Test Setting 4, AC input
2.8 V
signal.
AV 3.5 V Max
/A ABL Gain Reduction at 3.5V (Note 12), Test Setting 4, AC input
2 dB
signal. VABL= 3.5V
AV 2.0 V Max
/A ABL Gain Reduction at 2.0V (Note 12), Test Setting 4, AC input
12 dB
signal. VABL= 2.0V
IABLActive ABL Input bias current during (Note 12), Test Setting 4, AC input
10 µA
ABL signal. VABL=V ABLMIN GAIN
IABLMax ABL input current sink capability (Note 12), Test Setting 4, AC input
1.0 mA
signal.
VABLMax Maximum ABL Input voltage (Note 12), Test Setting 4, AC input VCC+
V
during clamping signal. IABL=I ABLMAX 0.1
AV ABL Track ABL Gain Tracking Error (Note 9), Test Setting 4, 0.7 VP-P
input signal, ABL voltage set to 4.5V 4.5 %
and 2.5V.
RIP Minimum Input resistance (pins 5, Test Setting 4.
20 M
6, 7)


OSD Electrical Characteristics
Unless otherwise noted: TA = 25 C,VCC = +5.0V. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
Symbol Parameter Conditions Min Typ Max Units
VOSDHIGH
max Maximum OSD Level with OSD Palette Set at 111, OSD Contrast =
4.5 V
Contrast 11 11, Test Setting 3
VOSDHIGH
10 Maximum OSD Level with OSD Palette Set at 111, OSD Contrast =
3.9 V
Contrast 10 10, Test Setting 3
VOSDHIGH
01 Maximum OSD Level with OSD Palette Set at 111, OSD Contrast =
3.2 V
Contrast 01 01, Test Setting 3
VOSDHIGH
00 Maximum OSD Level with OSD Palette Set at 111, OSD Contrast =
2.4 V
Contrast 00 00, Test Setting 3
VOSD(Black) Difference between OSD Black Register 08=0x18, Input Video =
Level and Video Black Level (same Black, Same Channel, Test Setting 20 mV
channel) 8
VOSD(White) Output Match between Channels Palette Set at 111, OSD Contrast =
11, Maximum difference between R, 3%
G and B
VOSD-out
(Track) Output Variation between Channels OSD contrast varied from max to
3%
min


DAC Output Electrical Characteristics
Unless otherwise noted: TA = 25 C,VCC = +5.0V, VIN = 0.7V, VABL=V CC L = 8 pF, Video Outputs = 2.0 VP-P See (Note 7)
,C .
for Min and Max parameters and (Note 6) for Typicals. DAC parameters apply to all 4 DACs.
Symbol Parameter Conditions Min Typ Max Units
VMinDAC Min output voltage of DAC Register Value = 0x00 0.5 0.7 V
VMaxDAC Max output voltage of DAC Register Value = 0xFF,
3.7 4.2 V
Mode 00 DCF[1:0] = 00b
VMaxDAC Max output voltage of DAC in Register Value = 0xFF,
1.85 2.35 V
Mode 01 DCF mode 01 DCF[1:0] = 01b




--25--
TDA4841
MC68HC705BD7B

FEATURES
Concept features
· Full horizontal plus vertical autosync capability
· Extended horizontal frequency range from 15 to 130kHz
· Comprehensive set of I2C-bus driven geometry adjustments and functions, including standby mode
· Very good vertical linearity
· Moire cancellation
· Start-up and switch-off sequence for safe operation of all power components
· X-ray protection
· Power dip recognition
· Flexible switched mode B+ supply function block for feedback and feed forward converter
· Internally stabilized voltage reference
· Drive signal for focus amplifiers with combined horizontal and vertical parabola waveforms
· DC controllable inputs for Extremely High Tension (EHT) compensation
· SDIP 32 package.
Synchronization
· Can handle all sync signals (horizontal, vertical, composite and sync-on-video)
· Output for video clamping (leading/trailing edge selectable by I2C-bus), vertical blanking and
protection blanking
· Output for fast unlock status of horizontal synchronization and blanking on grid1 of picture tube.
Horizontal section
· I2C-bus controllable wide range linear picture position, pin unbalance and parallelogram correction
via horizontal phase
· Frequency locked loop for smooth catching of horizontal frequency
· Simple frequency preset of fmin and fmax by external resistors
· Low jitter
· Soft start for horizontal and B+ control drive signals.
Vertical section
· I2C-bus controllable vertical picture size, picture position, linearity (S-correction) and linearity balance
· Output for I2C-bus controllable vertical sawtooth and parabola (for pin unbalance and parallelogram)
· Vertical picture size independent of frequency
· Differential current outputs for DC coupling to vertical booster.
· 50 to 160Hz vertical autosync range.
East-West (EW) section
· I2C-bus controllable output for horizontal pincushion, horizontal size, corner and trapezium
correction
· Optional tracking of EW drive waveform with line frequency selectable by I2C-bus.
Focus section
· I2C-bus controllable output for horizontal and vertical parabolas
· Vertical parabola is independent of frequency and tracks with vertical adjustments
· Horizontal parabola independent of frequency
· Adjustable pre-correction of delay in focus output stage.




--26--
EHT compensation
via vertical size

VCAP 7V
EHT compensation
22 k 100 150 via horizontal size
1.2V
1% nF nF
VREF 5% VAGC VSMOD HSMOD EWDRV
23 24 22 21 31 11
BLOCK DIAGRAM




V-SYNC INPUT V-SYNC VERTICAL EHT COMPENSATION EW-OUTPUT V-OUTPUT 12 VOUT2
14
V-sync AND POLARITY OSCILLATOR H-SIZE AND V-SIZE H-PINCUSHION
(TTL level) CORRECTION INTEGRATOR AND AGC V-LINEARITY 13 VOUT1
H-CORNER
H-TRAPEZIUM V-LINEARITY BALANCE
clamping H-SIZE
VIDEO V-POSITION
blanking 16
CLAMPING V-SIZE, VOVSCN
AND V-BLANK
OUTPUT or
TDA 4841 ASOR 20
Q995/V995 Technical Service Manual




PROTECTION ASYMMETRIC
17 HUNLOCK
HUNLOCK AND SOFT START EW-CORRECTION
OUTPUT
FOCUS
19 HORIZONTAL 32
SDA I 2 C-BUS 2
18 I C-BUS REGISTERS