Hitachi CM772U, CM772ET, CM771U, CM771ET Schematic

SM0401

CM771ET CM771U

SERVICE MANUAL

CM772ET CM772U

DJ72 Chassis

CAUTION:

FEATURES...........................................................................................................................2

SAFETY PRECAUTIONS......................................................................................................2

CHECK OF HIGH VOLTAGE HOLD DOWN CIRCUIT.........................................................2

PRODUCT SAFETY NOTICE...............................................................................................3

SPECIFICATIONS ................................................................................................................3

CONTROLS..........................................................................................................................4

SIGNAL TIMING CHART......................................................................................................5

DESCRIPTION OF CIRCUIT ................................................................................................7

TROUBLESHOOTING.........................................................................................................17

ADJUSTMENTS.................................................................................................................. 20

WIRING DIAGRAM............................................................................................................. 24

BLOCK DIAGRAM .............................................................................................................. 25

P.C.B.A. ASSEMBLY........................................................................................................... 26

REPLACEMENT PARTS LIST............................................................................................ 27

SCHEMATICS..................................................................................................................... 39

MECHANICAL PARTS LIST................................................................................................. 41

Before servicing this chassis, it is important that the service personnel must read the “Safety Precautions” and “Product Safety Notice” in this Service Manual.

CONTENTS

H972

(V1.0)

DISPLAY ASSEMBLY.......................................................................................................... 42

ATTACHMENT A ................................................................................................................. 45

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

HIGH RESOLUTION COLOR DISPLAY MONITOR

(Sept. 2000)

FEATURES

1. Flat screen CRT with anti-glare, dynamic focus circuit, dark glass, and INVAR shadow mask give the sharpest focus and highest contrast.

2. Automatic scanning and automatic adjustment to conform to a wide range of scanning frequencies and user requirements.

3. Signal input allows D-Sub Mini 15-pin cable.

4. Power Save Mode automatically puts the monitor into a standby mode (power consumption less than 15W) when the H.sync. signal is not detected, and a power off mode (less than 5W) when the V.sync. signal is not detected. Normal mode is restored immediately when the H. sync. signal and the V.sync. signal are detected. This feature prolongs monitor life and reduces energy consumption by up to about 75 %.

SAFETY PRECAUTIONS

NOTICE:

notes located on or inside the cabinet and on the chassis or picture tube.

The following precautions must be observed.

1. Do not install, remove, or handle the picture tube in

2. When replacing a chassis in the monitor, all the

3. When service is required, observe the original lead

4 Always use the manufacturer’s replacement components.

5. Before returning a serviced monitor to the customer,

6. In the case of the microprocessor unit, shop

High Voltage

This monitor is provided with a high voltage hold down circuit for clearly indicating that voltage has increased in excess of a predetermined value. Comply with notes described in this Service Manual regarding this hold down circuit when servicing, so that this hold down circuit may function correctly.

Comply with all cautions and safety related

any manner unless shatterproof goggles are worn. People not so equipped should be kept away while picture tubes are handled.

protective devices must be put back in place, such as, barriers, non-metallic knobs, adjustment and compartment shields, and isolation resistor-capacitor, etc.

dress. Extra precaution should be taken to assure correct lead dress in the high voltage circuitry area.

Especially critical components as indicated on the circuit diagram should not be replaced by other manufacturer’s one. Furthermore where a short circuit has occurred, replace those components that indicate evidence of overheating.

the service personnel must thoroughly test unit to be certain that it is completely safe to operate without danger of electrical shock, and be sure that no protective device built into the monitor by the manufacturer has become defective, or inadvertently defeated during servicing. Therefore, the following checks should be performed for continued protection of the customer and service technician.

adjustment is necessary after exchange of the microprocessor unit.

Service Warning

With minimum Brightness and Contrast the operating high voltage in this display is lower than 30 kV. If any component having influence on the high voltage is replaced, confirm that the high voltage with minimum Brightness and Contrast is lower than 30 kV. To measure high voltage use a high impedance high-voltage meter. (SENSITIVE RESEARCH Model: ESH or Equivalent) Connect (-) to chassis earth and (+) to the CDT anode button. (See the following connection diagram Fig. 1.)

NOTE:

Turn power switch off without fail before making

the connection to the Anode button

CDT ANODE

HIGH IMPEDANCE H.V. METER SENSITIVE RESEARCH Model: ESH or equivalent. CHASSIS GROUND

(+)

(-)

FIG. 1

X-radiation

TUBE:

The source of X-radiation in this monitor is the picture tube. The tube utilized in this chassis is specially constructed to limit X-radiation emissions. For continued X-radiation protection, the replacement tube must be the same type as the original, manufacturer approved type. When troubleshooting and making test measurements in a monitor with a problem of excessive high voltage, avoid being unnecessarily close to the picture tube and the high voltage components. Do not operate the chassis longer than is necessary to locate the cause of excessive voltage.

CHECK OF HIGH VOLTAGE HOLD DOWN CIRCUIT

Checking of the high Voltage hold down circuit operation.

1. Turn the switch of the unit ON, and set the Brightness

and Contrast controls to max.

2. Turn the switch of the unit OFF.

3. Connect a DC Voltmeter and an adjustment jig as

shown in Fig. 2.

4. Set the adjustment VR to fully counterclockwise.

5. Turn the switch of the unit ON and gradually rotate the

adjustment VR clockwise.

6. Check that a reading of DC voltage-meter is less-than

0.60.1 V when picture disappears.

7. Turn the switch of the unit OFF immediately after

checking that the picture disappears.

8. Remove the adjusting jig and the DC voltmeter.

NOTE:

Reading of 0.6 V is approximately equivalent to 30 kV of CDT Anode High Voltage.

 2 

PRODUCT SAFETY NOTICE

Many electrical mechanical parts in the color monitor units have special safety related characteristics. These are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service Manual. Electrical components having such features are identified by marking with on the schematics and on the parts list in this Service Manual. The use of a substitute replacement component which does not have the same safety characteristics as the manufacturer recommended replacement one, shown in the parts list in this Service Manual, may create shock, fire, X-radiation, or other hazards. Productions are issued from time to time. For the latest information, always consult this Service Manual.

SPECIFICATIONS

DC VOLT METER (10 V range)

VARIABLE



Clockwise

RESISTER

To CHASSIS GROUND

R793



R792

DEF BOARD ASSEMBLY

FIG. 2 CHECKING CIRCUIT USING JIG

RESISTER 300 k -B (1/2 W)

68 k (1/2W)

Model Name

CM771U CM771ET CM772U CM772ET

Destination North America Europe North America Europe

Rated Voltage AC 100-120 / 200-240 V, Automatically select.

Provided with Power Circuit.

Power Consumption 98 W nominal

Color Display Tube (CDT)

Rated Frequency

Resolution

Horizontal 31 - 96 kHz 31 - 96 kHz 31 - 106 kHz 31 - 106 kHz

Vertical 50 - 160 Hz

Horizontal Up to 1600 dots Up to 1600 dots Up to 1600 dots Up to 1600 dots

19 inches diagonal, 0.22 mm horizontal dot pitch, Invar shadow mask, Black matrix, Anti-Reflection coat, Short persistence phosphors.

Vertical Up to 1280 lines Up to 1280 lines Up to 1280 lines Up to 1280 lines

Signal Inputs Red, Green and Blue analog video

H/V separate, H/V composite or Sync. on Green sync.

User Controls Power Switch

Degauss Language Select Contrast Brightness H. Position H. Size V. Position V. Size

Environmental Condition

Operation Storage Temperature : 5  to 35  20  to 60 

Rotation Pincushion Trapezoid Pin.Balance Parallelogram H. Moiré V. Moiré Color Select Red, Green, Blue

DMS Mode OSD H-Position OSD V-Position Dynamic Focus V.Linearity V.L. Balance Hemisphere Total Reset Single Recall

Top Corner Pin. Bottom Corner Pin.

Humidity : 10 % to 80 % 10 % to 90 %

Dimensions

448(W)  442 (H)  450 (D) mm, Including Tilt & Swivel base.

Weight 24.0 kg

 3 

CONTROLS

Front Cover

Control Panel

FIG.3 FRONT VIEW

Menu Key Adjustment Keys

FIG. 4 CONTROL PANEL

Power Indicator

Power Switch

CRT Surface

Tilt & Swivel Base

FIG. 3 FRONT VIEW

D-Sub Mini 15-pin

AC Inlet

FIG. 5 REAR VIEW

Signal Cable

(D-Sub Mini 15-pin)

 4 

SIGNAL TIMING CHART

Signal

CM771U-511 999

CM771ET-301 999

CM772U-511 999

CM772ET-301 999

1 Video Type R/G/B Analog R/G/B Analog R/G/B Analog R/G/B Analog

Voltage 0.7 Vp-p 0.7 Vp-p 0.7 Vp-p 0.7 Vp-p

Set Up None None None None

2 Sync Type H/V Separate H/V Separate H/V Separate H/V Separate

Amp. TTL Level

3 Video frequency 25.175 MHz 56.250 MHz 94.500 MHz 157.500 MHz

4 Character (Letter)

5 Horizontal Frequency 31.469 kHz 53.674 kHz 68.677 kHz 91.146 kHz

Front

porch

Sync.

width

Back

porch

Blanking

width

Display

time

H. period

(1H)

6 Vertical Frequency 70.086 Hz 85.061 Hz 84.997Hz 85.024 Hz

Front

porch

Sync.

width

Back

porch

Blanking

width

Display

time

H. period

(1H)

7 Scan System (Non-interlaced) (Non-interlaced) (Non-interlaced) (Non-interlaced)

8 Signal name 30B 54A 68A 91A

* VGA is a registered trademark of International Business Machined Corporation. * VESA is a trademark of a nonprofit organization, Video Electronics Standard Association.

640 dots400 lines 800 dots600 lines 1024 dots768 lines 1280 dots1024

0.636 µs (16cl) 0.569 µs (32cl) 0.508 µs (48cl) 0.406 µs (64cl)

3.813 µs (96cl) 1.138 µs (64cl) 1.016 µs (96cl) 1.016 µs (160cl)

1.907 µs (48cl) 2.702 µs (152cl) 2.201 µs (208cl) 1.422 µs (224cl)

6.356 µs (160cl) 4.409 µs (248cl) 3.725 µs (352cl) 2.844 µs (448cl)

25.422 µs (640cl) 14.222 µs (800cl) 10.836 µs (1024cl) 8.127 µs (1280cl)

31.778 µs (800cl) 18.631 µs (1048cl) 14.561 µs (1376cl) 10.971 µs (1728cl)

0.381 ms (12H) 0.019 ms (1H) 0.015 ms (1H) 0.011 ms (1H)

0.064 ms (2H) 0.056 ms (3H) 0.044 ms (3H) 0.033 ms (3H)

1.112 ms (35H) 0.503 ms (27H) 0.524 ms (36H) 0.483 ms (44H)

1.557 ms (49H) 0.578 ms (31H) 0.582 ms (40H) 0.527 ms (48H)

12.711 ms (400H) 11.179 ms (600H) 11.183 ms (768H) 11.235 ms (1024H)

14.268 ms (449H) 11.756 ms (631H) 11.765 ms (808H) 11.761 ms (1072H)

VGA

640400

(70Hz)

(Neg./Pos.)

VESA

800600

(85Hz)

9999

TTL Level

(Pos./Pos.)

VESA

1024768

(85Hz)

9999

TTL Level

(Pos./Pos.)

VESA

12801024

(85Hz)

9999

TTL Level

(Pos./Pos.)

lines

 5 

Signal

CM771U-511

CM771ET-301

CM772U-511 -

CM772ET-301 -

1 Video Type R/G/B Analog R/G/B Analog R/G/B Analog R/G/B Analog

Voltage 0.7 Vp-p 0.7 Vp-p 0.7 Vp-p 0.7 Vp-p

Set Up None None None None

2 Type H/V Separate H/V Separate H/V Separate H/V Composite

Amp. TTL Level

3 Video frequency 202.500 MHz 229.500 MHz 25.175 MHz 24.800MHz

4 Character (Letter)

5 Horizontal Frequency 93.750 kHz 106.250 kHz 31.469 kHz 31.000 kHz

Front

porch

Sync.

width

Back

porch

Blanking

width

Display

time

H. period

(1H)

6 Vertical Frequency 75.000 Hz 85.000 Hz 59.940 Hz 50.000 Hz

Front

porch

Sync.

width

Back

porch

Blanking

width

Display

time

H. period

(1H)

7 Scan System (Non-interlaced) (Non-interlaced) (Non-interlaced) (Non-interlaced)

8 Signal name 94A 106B 30C 31W

0.316 µs (64cl) 0.279 µs (64cl) 0.636 µs (16cl) 0.403 µs (10cl)

0.948 µs (192cl) 0.837 µs (192cl) 3.813 µs (96cl) 3.790 µs (94cl)

1.501 µs (304cl) 1.325 µs (304cl) 1.907 µs (48cl) 2.258 µs (56cl)

2.765 µs (560cl) 2.440 µs (560cl) 6.356 µs (160cl) 6.452 µs (160cl)

7.901 µs (1600cl) 6.972 µs (1600cl) 25.422 µs (640cl) 25.806 µs (640cl)

10.667 µs (2160cl) 9.412 µs (2160cl) 31.778 µs (800cl) 32.258 µs (800cl)

0.011 ms (1H) 0.009 ms (1H) 0.381 ms (10H) 3.548 ms (110H)

0.032 ms (3H) 0.028 ms (3H) 0.064 ms (2H) 0.129 ms (4H)

0.491 ms (46H) 0.433 ms (46H) 1.049 ms (33H) 3.097 ms (96H)

0.533 ms (50H) 0.471 ms (50H) 1.430 ms (45H) 6.774 ms (210H)

12.800 ms (1200H) 11.294 ms (1200H) 15.253 ms (480H) 13.226 ms (410H)

13.333 ms (1250H) 13.333 ms (1250H) 16.683 ms (525H) 20.000 ms (620H)

VESA

16001200

(75Hz)

(Pos./Pos.)

1600 dots1200

lines

VESA

16001200

(85Hz)

TTL Level

(Pos./Pos.)

1600 dots1200

lines

VGA

640480

(60Hz)

 

TTL Level

(Neg./Neg.)

640 dots480 lines 640 dots410 lines

TTL Level (Neg./Neg.)

Adjustment

signal

 6 

DESCRIPTION OF CIRCUIT

1. Power Supply Circuit

This model incorporates a wide range universal power supply utilizing a switching regulator (see block diagram in Fig.6).

1.1 AC input

AC input consists of AC inlet, EMI filter (C901C905,C907) and rectifier (D901D904). Rectifier circuits adapt to full-wave method. Inrush current limiting circuit (R90A) protects from excessive inrush current at initial stage of power on.

1.2 Switching Regulator circuit

Switching Regulator circuit is designed to handle variations of two conditions to ensure constant +B voltage to secondary circuit : (Circuit #2) varying load conditions of video, (Circuit #3) varying horizontal frequencies and load conditions.

1.2.1 Circuit #1 :

Circuit #1 consists of chopper inductor (L910), chopper component (Q910), rectifier component (D910, C920) and control IC (I920). R918 and R919, R91A detect output voltage and provide signal to I920 pin 20 which adjusts the pulse width based on the pin 20 voltage level to provide constant voltage output.

1.2.2 Circuit #2 :

Circuit #2 consists of chopper transformer (T921), chopper component (Q920) and control IC (I920). T921 detects output voltage and provides signal to I920 pin 4 which adjusts the pulse width based on the pin 4 voltage level to provide constant voltage output. If the secondary circuit becomes overloaded, primary current through T921 is detected at R923, R924 and stops the switching operation. Once the circuit has overloaded, the power switch must be turned off for a short period and then turned on to re-establish power.

Switching frequency is determined by time constant of R92E and R92F, R92G.

1.2.3 Circuit #3 :

Circuit #3 has two outputs. +5V is used mainly to drive the microprocessor circuit and input the signal selection circuit. +6.3V is used for the CRT heater.

When the DC voltage from circuit #1 is applied to I940, I940 starts oscillations. Once oscillations start, the switching transistor is driven by the voltage taken from the tertiary winding of T940. The output voltage of the T940’s tertiary winding is rectified by D942 and C942.

The main power supply (Circuit #2) turns on (off) when a signal High (Low) is applied to the base of Q984 from the microprocessor circuit.

1.3 Degaussing circuit

When the power is switched on, the CRT is degaussed automatically by current flowing through the degauss circuit while the relay (S99R) is closed. Degaussing current flows for approximately 20 seconds and stops by causing relay (S99R) to be opened after secondary circuit operation is stabilized. The circuit also allows for manual degauss by using “DEGAUSS” control on OSD menu which closes S99R through Q991 to allow current to flow through the degauss coil.

 7 

AC inlet

FIG. 6 BLOCK DIAGRAM FOR POWER SUPPLY CIRCUIT

Main power supply

Circuit #2

Chopper

Control

+85V

+54V

+14V

Circuit #1

Degauss

Circuit

Manual

Degauss

Circuit #3

+ 12V

Chopper

On/Off control

Reg.

+ 6.3V

MPU

Control

Standby power supply

On/Off

On/Off control

Heater

 8 

2. Video Processing Circuit

Amp

2.1 Video select circuit (Optional)

Two of Video input signals shall be switched at Video selector (I205) controlled by switching signal coming from microprocessor.

2.2 Video Processor

The video input signal of 0.7 Vp-p is amplified to approximately 50 Vp-p by the video processing circuit and is fed to the cathode to drive the beam current. This chassis incorporates a single chip video processor I201, with three channels, one for each of R/G/B, which functions as the pre-amp of the inputs, OSD mixer and also gain control. A control signal from the microprocessor changes the amplifier gain of the video channels (R/G/B) together with white balance control.

Video Output circuit I202 amplifies R/G/B signals controlled by I201 to the enough level to drive Cathode of CRT. DC voltage of Cathode is determined by DC Cut off voltage from Cathode Clamp Circuit. DC Cut off voltage is generated at Level Shift Circuit which consists of I203, Q22R, Q22G and Q22B, whose R/G/B channels are also controlled by microprocessor.

2.3 ACL Circuit

The current at the secondary winding of the flyback transformer is used to represent the CRT beam current. The current is measured and fed to the contrast control Q281,Q282 to limit the maximum beam current with negative feedback.

2.4 Blanking Circuit

Video blanking during the beam retrace period is achieved by applying both horizontal and vertical blanking pulses to I201.

2.5 Precedence of Clamp Pulse Circuit

Video Processor I201 receives Clamp pulse signal from I701, Precedence of Clamp Pulse Circuit.

2.6 OSD Circuit

I301 receives H/V pulses from Deflection Circuit and control signal from microprocessor, whose output feeds Clock signals synchronized with H pulse and control signals from microprocessor, OSD display signals in R/G/B, OSD blanking signal to OSD Mixer Circuit in I201.

FIG. 7 VIDEO PROCESS CIRCUIT

Video in to CRT

Video Processor I201

Gain Control

Amp. Clamp

Level shift

ACL

I701

Output

Cathode clam

Cathode

R/G/B Gain Control

Contrast Control

From FBT

Brightness Control

R/G/B Cut off Control

 9 

)

8Buffe

)

3. Horizontal Deflection and High Voltage Regulation Circuit

3.1 Horizontal Deflection Circuit

The purpose of the horizontal deflection circuit is to cause the CRT electron beam to be scanned horizontally by driving a current through the deflection yoke, synchronized by the H sync pulse. The circuit consists of an AFC circuit, made up of an H phase locked loop and VCO (voltage controlled oscillator), and the deflection output. The H.sync. signal is input to I701 where it is delayed and then input to a phase detector. The phase locked loop (I701) also accepts input from a saw tooth waveform which is provided by the deflection feedback (flyback pulse) through the R707. The output of the phase detector creates an error voltage between the feedback pulse and the input pulse and is then fed to the VCO after processing by an AFC Filter. If the oscillator frequency deviates more than 4% of H.SYNC, PLL1 (I701) goes into search mode and HUNLOCK (I701) changes to “H”. The minimum horizontal frequency is determined by the capacitor at C706 and R704. Horizontal frequency range is determined by R705. H.SIZE, S.PIN and Trapezium are controlled by PWM circuit (Q801). The output pulse from the VCO is fed to the pre-drive and then output from I701 to the drive buffer Q701 / Q702. The pre-drive circuit within I701 is controlled by duty cycle by the internal circuit. In case of no sync signals supplied or excessive frequency change, such as a signal timing change, HUNLOCK once changes to “H”, and PWM circuit (Q801) output is stopped. The deflection circuit of the DJ72 chassis has been separated from the high voltage regulation circuit to provide improved H linearity performance by utilizing the consonant conditions of the horizontal beam current characteristics. The S-consonant capacitors, C770C777, are changed by Q767Q771 and S77R, which provide 812 stages of

consonant conditions. The horizontal linearity coils L771L772 are changed by S77R to provide two stages of H Linearity conditions. The H.DEF +B voltage chopper power supply parabolically modulates the H.DEF +B voltage of the deflection circuit, based on the horizontal frequency, to provide a frequency - dependent voltage of between 42.5V and 160V to the deflection circuit.

HFLB

V.SYNC

H.CP

V.BLK

From MPU

H.SYNC/Composite SYNC

MPU

FIG. 8 HORIZONTAL DEFLECTION CIRCUIT

I701

SEPA RATER

SDA

SCL

+B (+200V

H.SIZE CONTROL

OSCILLATOR

5 3 4 6

Drive Buffer

E / W

From

H.SIZE

PWM

H.Cen

MPU

I601

Vertical

Output

H-V

Def Out

Amp

Driv

H.DRIVER

+B E

V.DY

Lin. Coil

(85V

PWM

Module

Lin. Coil

T751

L771

ERROR

S77R

C771~

Q767~

Q771

 10 

C777

From MPU

S.fig. Cap.

C770

From MPU

Select Select

V-sync

clamping blanking

HUNLOCK

SDA

SCL

I701

FIG. 9 DEFLECTION CONTROL IC BLOCK DIAGRAM

EWDRV

EW-Output

H-Pincushion

H-Corner

H-Trapezium

V-Sync

Integrator

Video Clamping And V-BLANK

HUNLOCK Output

I2C-BUS

Receiver

Vertical

Oscillator

and AGC

V-Position V-Size,VOVSCN

Protection

and Soft Start

I2C-BUS Registers

1.2V

V-Output

V-Linearity

V-Linearity Balance

FOCUS

Horizontal

and Vertical

H-Size

Control

OUT2

OUT1

Focus

H-Size Control Oscillator

H/C-sync

H/C-Sync

Input and

Polarity

Correction

Coincidence Detector

PLL1 and

H-Position

Horizontal

Oscillator

H-Output

Stage

PLL2,Parallelogram,

Pin Unbalance and

Soft Start

HFLB

HDRV

 11 

FBT

3.2 High Voltage Regulation Circuit

The output pulse from Q701 is also fed to the high voltage regulation circuit with the same design of consonant circuit as the horizontal deflection circuit. High voltage of 27.0 kV is obtained by the step-up windings of the flyback transformer to drive the CRT anode. The high voltage is monitored by the E

error detection circuit. The error detection circuit

functions by stepping the high voltage down and comparing it with the reference voltage of inside I740 whose output controls I740, the Integrated Circuit included with E

switching transistor.

3.3 Dynamic focus drive circuit

This monitor’s CRT includes a dynamic focusing electron gun to achieve sharp and uniform focus throughout the display area. The CRT’s Focus anode receives a DC component of approximately 27% of the CRT anode voltage, combined with the AC voltage parabolic wave form of magnitude of 600 Vp-p horizontal, and 180 Vp-p vertical. DC focus voltage is obtained from a tap of the flyback transformer’s bleeder resister, and fed to G3 focus electrode. Horizontal and vertical parabolic output pulses are amplified at Q501Q508, T560 and fed to the flyback transformer where they are combined with the DC component (27% of anode voltage). The potentiometers (focus 1, focus 2) at the flyback adjust the DC focus voltage. The focus 2 potentiometer mainly adjusts horizontal beam shape (vertical line width), and the focus 2 potentiometer mainly adjusts the vertical beam shape (horizontal line width) by optimizing the DC component of the parabolic waveform.

3.4 High Voltage Hold-Down Circuit

DJ72- Chassis uses a system that stops H/V DRIVE SIGNAL output when abnormal high voltage is detected. So that the high voltage output will be declined to zero. The circuit operation in detail is as follows. When an input voltage to I740 (pin15, it is determined by R792 and R793) exceeds the specified level, the high voltage is declined to zero.

FIG.10 HIGH VOLTAGE HOLD-DOWN CIRCUIT DIAGRAM

For the models CM771U-511, CM771ET-301

I740 module



EHV +B





R792 R791

R793

C791

D790

L791

HIGH VOLTAGE

CRT

R746

R756

R747

 12 

+ 26 hidden pages