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

V



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)

9

9

9

9

(Neg./Pos.)

VESA

800600

(85Hz)

9999

9999

9999

9999

TTL Level

(Pos./Pos.)

VESA

1024768

(85Hz)

9999

9999

9999

9999

TTL Level

(Pos./Pos.)

VESA

12801024

(85Hz)

9999

9999

9999

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)

9

9

(Pos./Pos.)

1600 dots1200

lines

VESA

16001200

(85Hz)

-

-

9

9

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

Chopper

Control

+B

+85V

+54V

+14V

Circuit #1

Degauss

Circuit

Manual

Degauss

Circuit #3

+ 12V

Chopper

On/Off
control

5V

Reg.

+ 6.3V

MPU

Control

Standby power supply

On/Off

On/Off
control

Heater

 8 

2. Video Processing Circuit

Amp

p

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

e

t

)

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

14

SEPA
RATER

SDA

SCL

+B (+200V

16

19

18

15

17

H.SIZE CONTROL

OSCILLATOR

5 3 4 6

Drive
Buffer

E / W

From

H.SIZE

PWM

H.Cen

MPU

32

12

13

I601

Vertical

Output

f

H-V

Def
Out

Amp

Amp

Driv

r

H.DRIVER

+B E

V.DY

Lin.
Coil

(85V

PWM

E

HV

Module

Lin.
Coil

T751

T751

L771

ERROR

S77R

C771~

Q767~

Q771

 10 

C777

From MPU

S.fig.
Cap.

S.fig.
Cap.

C770

From MPU

Select Select

V-sync

clamping
blanking

HUNLOCK

SDA

SCL

I701

14

16

17

19

18

FIG. 9 DEFLECTION CONTROL IC BLOCK DIAGRAM

EWDRV

11

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

7V

1.2V

V-Output

V-Linearity

V-Linearity Balance

FOCUS

Horizontal

and Vertical

H-Size

Control

12

13

32

6

4

3

5

V

OUT2

V

OUT1

Focus

H-Size
Control
Oscillator

H/C-sync

15

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

1

HFLB

HDRV

8

 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

HV

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.

HV

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

8

10

E

HV

I740
module



EHV +B





R792 R791

R793

+

C791

-

D790

L791

HIGH
VOLTAGE

CRT

R746

R756

R747

 12 

4. Vertical Deflection Circuit

The purpose of the vertical deflection circuit is to cause the CRT electron beam to be scanned vertically by driving a
current through the deflection yoke, synchronized by the V sync pulse. V sync is input to the V oscillator circuit, I701,
generating the vertical saw tooth wave. The vertical saw tooth wave is fed to I601 to be amplified of I601 to drive the
vertical deflection yoke.
The feedback circuit inside I601 works such that the differential voltage between pin9 and pin4 equals zero. The
differential input current is compared with the feedback current, and the differential drives the output amplifiers. By
varying resistor R612 or R619 one can set the desired deflection current.
The picture can be shifted in vertical direction by making a DC-offset current through the coil. DC-offset current through
the coil is controlled by the differential input current from I701.
I601 uses an external flyback supply voltage, which is connected to pin7. The signal from the I601 8pin output is used
for protection. The guard output is also activated during thermal shutdown i.e. when Tj>=160
of range.

FIG. 11 VERTICAL DEFLECTION CIRCUIT

o

C, and feedback loop out

V.SYNC

From MPU

SDA

SCL

V.BLK

I601

8 3 5 7

GUARD

I701

V.Lin

V.Lin balance

V.Position

19

18

13

12

V.OUT

14

IN A

IN B

1

INPUT
STAGE

2

CIRCUIT

PROTEC

TION

GND

C609
+

AMPLIFIER

AMPLIFIER

V

VP

FB

+

C613

FLYBACK

GENERATOR

A

B

6

OUT A

9

FEEDB

4

OUT B

C610

R620

R619

R611

V.DY

R612

 13 

5. Microprocessor Circuit

The microprocessor circuit consists of the following four detailed circuits as shown in Fig.12.

1. Sync detect circuit

2. Front panel key data Input / Output (I/O)

3. Processing and memory

4. Control output

5.1 Sync detect circuit

The sync priority selector (I302) outputs H/V separate or composite sync signal to the sync processor inside the
microprocessor (I101). The sync processor has H/V polarity detector and sync separator for composite sync, H/V
frequency counter, dummy frequency generator, and outputs the processed H/V sync signal to the deflection processing
IC (I701) through the sync selector (I104).

5.2 Front panel key data Input / Output (I/O)

Microprocessor (I101) received user input from the front panel keys, which consists of: one menu key, four adjustment
keys (two pairs)

Contrast and Brightness are adjusted by four adjustment keys when OSD is disappeared.

Other feature requires controlling four adjustment keys when OSD is appeared by a menu key.

Current settings (including picture size, geometry, and color setting) are automatically stored to non-volatile memory.
The maximum memory capacity is for 48 presets including factory standard settings.

5.3 Processing and memory

I101 is an 8-bit microprocessor that equips with ROM and RAM for system program and sync processing circuit. Data
memory consists of one EEPROM chip (I102) for preset data.

5.4 Control output

Output of the microprocessor (I101) controls the deflection processing IC (I701) and the video pre-amplifier IC (I201),
the OSD control IC (I301), the rotation circuit, Horizontal drive correction circuit, the mute circuit, the sync priority
selector (I302), sync selector (I104), power save function. The deflection processing IC receives the signal through I
Bus to control the geometric function (H/V size and position, Pincushion, Trapezoid, Pin.Balance, Parallelogram, H/V
Moiré, Dynamic focus, Top/Bottom corner pincushion, V.Linearity, V.L.Balance). The video pre-amplifier IC receives the
signal through I
to control R/G/B Cut off and Contrast, Brightness, Sub BKG, ACL, C-Contrast, and shows guidance for monitor control
function on screen display by generating video signal for OSD and feeding it to video pre-amplifier IC. Power save
function has Standby mode (main power supply has no output if either H sync or V sync is not supplied) and Off mode
(all power supply except +5V have no output if both H sync and V sync are not supplied). The mute circuit brings video
output to black level when timing signal changes or the monitor goes into the power saving mode.

This chassis is capable of communication with external PC for factory adjustment through video connector (D-sub).

2

C Bus to control R/G/B Gain and Sub Contrast. The OSD control IC receives the signal through I2C Bus

2

C

 14 

y

Sync on Green

H/V Separate

or

Composite Sync

FIG. 12 MICROPROCESSOR CIRCUIT

Sync
Priority
Control

Polarity

H/V s

Detect

nc

H/V sync

H.sync

H/V sync

H/V
Dummy
Sync
Generator

Selector

Deflection

1.H/V Size

2.H/V Position

3.Pincushon

4.Trapezoid

5.Pin.Balance

6.Parallelogram

7.Top/Bottom corner Pin.

OSD

8.H/V

9.Dynamic Focus

10.V.Linearity

11.V.L.Balance

12.Hemisphere

1.Contrast

2.Brightness

3.Color BKG R/G/B

4.Sub BKG

5.C-Contrast

6.ACL

Moiré

Front
Keys

Video

V Sync

Separator

DDC

port

V.sync

Sync Processor

Central

Processing

Unit

ROM RAM

H/V

Frequency

Counter

DAC

I101

I102

EEPROM

Microprocessor Circuit

I2C BUS

Video

Mute

Freq.

Select

Power

Save

Function

Rotation Control

Horizontal

drive

correction

1.Color Gain R/G/B

1.S-Fig. Cap select

1.Main power supply
On/Off

2.CRT heater
On/Off

1.H.SIZEC

2.f

to V

H

 15 

6. Power Save Function

The DJ72 chassis is capable of power savings by sensing of the sync input conditions by the microprocessor. The
microprocessor can identify two sync conditions, (1) No detection of H.sync, (2) No detection of V sync.

The following table shows the details of the Power save mode.

TABLE: POWER SAVE FUNCTION

Sync

V Sync Yes Yes No No

VESA

Standard

Effect None Minimum Minimum Maximum

Circuit

Operation

Video

Power LED CM771U-511

Power consumption

(Typical) : AC (120V)

H Sync Yes No Yes No

Name Normal Standby Suspend Off

Recovery Time N/A Short Short

H. Deflection

V. Deflection

CM771ET-301

Normal

operation

Normal

operation

Normal

operation

Lighting

Green

All White : 98W
All Black : 65W

System

Dependent

Stop Stop Stop

Stop Stop Stop

Mute Mute Mute

Lighting

Orenge

less than 10W less than 10W less than 3W

Lighting

Orenge

Lighting

Orenge

 16 

TROUBLESHOOTING

1. Raster does not appear

Relevant circuit : Power circuit, Horizontal deflection circuit,

High voltage limitter circuit

Check supply

Voltage AC100-200V/

AC 200-240V

Normal

Check F901

Power LED is green.

Normal

(Normal)

Yes

Abnormal

Abnormal

(Abnormal)
No

Replace F901

The power LED

is orange.

Normal

Ye s

Abnormal

No

Trouble outside the monitor

Q910, Q902, I940
D901, D902, D903, D904
C901, C902, C903, C904,
C905, C907, C910, C920

(Change the DJ72 Main Board)

I940, D98A

(Change the DJ72 Main Board)

Horizontal drive pulse

Abnormal

Normal

Check +B

after removing

L971

193.5+

3 V

Others

Sync. Signal input error
Refer to Item 2.

(Change the DJ72 Main Board)

Q765, Q801, I740

(Change the DJ72 Main Board)

(Change the DJ72 Main Board)

Sync. Signal input error

Refer to Item 2.

I740, T751

 17 

2. Synvhronization is not obtained

Relevant circuit : Sync. input circuit, Microprocessor, Deflection circuit

H.SYNC and V.SYNC of

H.SYNC and V.SYNC of

Check

I101 8pin and 9pin

normal

Check

I701 15pin and 14pin

normal

abnormal

abnormal

H.Sync.

or

V.Sy nc .

V.SYNC is
not
obtained

3. Vertical single line

Relevant circuit : Horizontal output circuit

H.SYNC is
not
obtained

I101, I104, I201, I302

Q320, D26Z, D35Z

(Change the DJ72 Video
Board or Main Board)

I101, I104, I201, I302, Q320

D19Z, D27Z, D36Z

(Change the DJ72 Video
Board or Main Board)

I104,I701

(Change the DJ72 Main
Board)

I101,I701

(Change the DJ72 Main
Board)

DY faulty, Q801, D763, Q764, Q765

4. Horizontal single line

Relevant circuit : Vertical deflection circuit

Check the

voltage on pin 3 of

voltage on pin 7 of

voltage on pin 24 of

I601

13~15V

Check the

I601

53~56V

Check the

I701

Normal

Others

Others

Vertical sawtooth is
not obtained

DY, C974, D764, D975, I601,

I971, Q763, Q764

(Change the DJ72 Main Board)

C973, D604, D605, D974,

I601, R610

(Change the DJ72 Main Board)

I701

(Change the DJ72 Main Board)

C602, C603, C621, I601,

R603, R604, R621, R622

(Change the DJ72 Main Board)

 18 

5. Color does not appear

A

Relevant circuit : Video amplifier circuit

Check

the input signal.

Normal

Check

the voltage of 12V

Normal (12V)

Check the

voltage of I201

24 pin

Normal (1.5~4.0V)

Abnormal

Abnormal

0V

the voltage of I201

Check

18 pin

Abnormal

Normal (2~3V)

Trouble outside the
character monitor

D975, I971

(Change the DJ72 Main Board)

bnormal

Check the

voltage of I301

13 pin

Normal (0~5V)

I301, I101

I203, Q281, Q282

Check

the voltage of I202

1 pin

Normal (30~75V)

Note

: Trouble in the blue circuit is shown in this diagram as representative color.

Refer to : when green does not appear, and when red does not appear.

0V

(Change the DJ72 Video Board)

I201,I101

(Change the DJ72 Video Board)

I202

(Change the DJ72 Video Board)

I203, Q22B

(Change the DJ72 Video Board)

 19 

ADJUSTMENTS

1. Power supply

1.1 Standby power supply voltage adjustment.

(1) Turn the switch of the unit off.

(2) Place a jumper wire across R943, Q801 (G)-(S), I101(26pin) to GND, I740(13pin) to GND on main-p.w.b to

disable Main power supply voltage.

(3) Place resister 3.9k(31W) across C971(+) to GND

(4) Receive reverse cross hatch pattern of signal 94A.

(5) Connect a Digital multimeter across C981.

(6) Turn the switch of the unit on.
(7) Adjust Standby power voltage to 6.2  0.05V using R982.

(8) Turn the switch of the unit off.

(9) Remove the jumper wire.

1.2 PFC output voltage adjustment.

(1) Turn the switch of the unit off.

(2) Place a jumper wire across Q801 (G)-(S), I101(26pin) to GND, I740(13pin) to GND on main-p.w.b to disable

horizontal output and EHV output.

(3) Place resister 3.9k(31W) across C971(+) to GND

(4) Receive normal cross hatch pattern of signal 94A.

(5) Connect a Digital multimeter between + and - of C920.

(6) Turn the switch of the unit on.
(7) Adjust R919 to 364  2V.

(8) Turn the switch of the unit off.

(9) Remove the jumper wire.

1.3 Main power supply voltage adjustment.

(1) Turn the switch of the unit off.

(2) Place a jumper wire across Q801 (G)-(S), I101(26pin) to GND, I740(13pin) to GND on main-p.w.b to disable

horizontal output and EHV output.

(3) Place resister 3.9k(31W) across C971(+) to GND

(4) Receive reverse cross hatch pattern of signal 94A.

(5) Connect a Digital multimeter across C972.

(6) Turn the switch of the unit on.
(7) Adjust Main power supply voltage to 85.5  0.3V using R973.

(8) Turn the switch of the unit off.

(9) Remove the jumper wire.

 20 

2. Deflection circuit

2.1 SUB H.SIZE adjustment

(1) Turn the switch of the unit off.

(2) Connect a Digital multimeter across C771.

(3) Turn the switch of the unit on.

(4) Receive normal cross hatch pattern of signal 94A.

(5) Adjust H.SIZE to maximum and S.Pincushion minimum by the Front Key.
(6) Adjust R811 to the C771 voltage value to 130  0.5V.
(7) Receive normal cross hatch pattern of signal 30C and check the C771 voltage is at 42.5  1.5V.

adjustment

2.2 High voltage adjustment

(1) Turn the switch of the unit off.

(2) Connect a high voltage meter, which is capable to measure up to 40kV, between CDT anode and GND.

(3) Receive normal cross hatch pattern of 94A signal.

(4) Turn the switch of the unit on.
(5) Adjust high voltage level to 27.0  0.3kV using R747.

(6) Turn the switch of the unit off.

(7) Remove the adjustment jig.

 21 

3. Video circuit

Prior to the video circuit adjustment, all sync. and Deflection circuit adjustment must be completed. The monitor must
have been warmed up for more than 60 minutes. Video signal must be terminated with 75 and should provide the
correct voltage at the monitor end.

[Pre-setting before adjustment]

TABLE 3: OUTPUT OF DAC

Function Pin No. Output

R Color FF (MAX)

G Color FF (MAX)

B. Color FF (MAX)

R. BKG #16 pin (I301) 0V (MIN)

G. BKG #17 pin (I301) 2.5V (CENT)

B. BKG #15 pin (I301) 0V (MIN)

Contrast #13 pin (I301) 0V (MAX)

Brightness #18 pin (I301) FF (MAX)

Sub Contrast 7F (CENT)

Sub Brightness #11 pin (I301) 7F (CENT)

ACL #12 pin (I301) 7F (CENT)

C-Cont #14 pin (I301) FF (MAX)

Note 1) Color Analyzer : Minolta CA 100 or equivalent.

3.1 Cut off adjustment

(1) Receive a signal of 94A with a blank signal pattern. (Black video)
(2) Connect a high impedance voltmeter (more than 1000M) to the Screen terminal (G2) on the Video board.

Adjust the Screen voltage pot on FBT to see 600  5V .

(3) After the screen voltage adjustment is completed, fix the SCREEN VR(FBT) shown in Attachment A.

(4) Ambient light on the surface of the CRT should show lower than 20 lux.

(5) Adjust R, G & B, BKG to show the CIE coordinate of

X=0.3130.02, Y=0.3290.02 at 1.2 cd/m

2

(0.35ft-L).

If it looks difficult to obtain X and Y readings mentioned above, do the followings to obtain these numbers.

1) Reset Sub Brightness to 9Fh or 60h.

2) Reset Sub Brightness to CFh or 30h.

3) If the adjustment can not be done with 1) and 2).

 When the value shown below can not hight: Change the R827 to R82E.
 When the value shown below can not low: Change the R827 to R82D.

3.2 White balance adjustment (Color 2)

(1) Receive a signal of 94A with a 100100 mm window pattern.

(2) Set Brightness Control to the center (7Fh) and C-Cont to the minimum (00h).

(3) Adjust the light output to 80 cd/m

(4) Adjust the white balance of high light output by Green and Blue color adjustments to read CIE coordinate of

X=0.313  0.008, Y=0.329  0.008

(5) Adjust Contrast Control to read 3 cd/m

(6) Adjust Red and Blue BKG to read the same CIE coordinate shown in 3.2.(4)

(7) Adjust Contrast or Sub Contrast Control to read 80 cd/m

shown out range, go back to 3.2(4)

(8) Register the readings of R/G/B BKG and Color data (Color 2) to the microprocessor.

2

(24.6ft-L) at the center of screen by adjusting Sub Contrast Control.

2

(0.87ft-L).

2

(23.3ft-L) and then confirm CIE coordinate. If it

3.3 White balance adj

ustment (Color 1)

(1) Receive a signal of 94A with a 100100 mm window pattern.

(2) Set Brightness Control to the center (7Fh) and C-Cont to the minimum (00h).

2

(3) Adjust the light output to 80 cd/m

(23.3ft-L) at the center of screen by adjusting Sub Contrast Control in

Color 2 mode.

(4) Adjust the white balance of high light output by R/G/B color adjustments to read CIE coordinate of

 22 

X=0.281  0.008, Y=0.311  0.008

(Either Red color or Green color must be set to the maximum (FFh) )

(5) Register the readings of R/G/B BKG and Color dada (Color 1) to the microprocessor.

3.4 White balance adjustment (Color 3)

(1) Receive a signal of 94A with a 100100 mm window pattern.

(2) Set Brightness Control to the center (7Fh) and C-Cont to the minimum (00h).

2

(3) Adjust the light output to 80 cd/m

(23.3ft-L) at the center of screen by adjusting Sub Contrast Control in

Color 2 mode.

(4) Set Red color to the maximum (FFh).

(5) Adjust the white balance of high light output by Green and Blue color adjustments to read CIE coordinate of

X=0.336  0.008, Y=0.352  0.008

(6) Register the readings of R/G/B BKG and Color data (Color 3) to the microprocessor.

3.5 White balance adjustment (DMS)

(1) Register Color 1 data(R/G/B BKG and Color data) to the microprocessor as DMS Color data.

3.6 Brightness adjustment

(1) White balance adjustment must have been done before Brightness adjustment.

(2) Receive signal of 94A with a blank signal pattern.(Black video)

(3) Set Brightness and Contrast, C-Cont Control to their maximums.

(4) Ambient light on the surface of the CRT should show lower than 20 lux.
(5) Select Color Select to Color 1.

(6) Adjust the light output to 1.2 cd/m

(7) Register the readings of Sub Brightness to the microprocessor (Sub Brightness data).

(8) Set Brightness Control to the center (7Fh) and C-Cont to the minimum (00h).
(9) Receive a signal 94A with a window pattern (100  100 mm)

(10) Adjust the light output to(*1) 150 cd/m

Contrast Control.

(11) Register the readings of Sub Contrast to the microprocessor (DMS Sub Contrast data).

(12) Adjust the light output to (*1)125 cd/m

Control.

(13) Register the readings of Sub Contrast to the microprocessor (Sub Contrast data).

(14) Receive a signal of 94A with a full white pattern.

(15) Adjust the light output to (*1) 110 cd/m

(16) Register the readings of ACL to the microprocessor (ACL data).

2

(0.35 ft-L) at the center of screen by adjusting Sub Brightness Control.

2

(43.8 ft-L) at the center of screen by adjusting Sub

2

(36.5 ft-L) at the center of screen by adjusting Sub Contrast

2

(32.1 ft-L) at the center of screen by adjusting ACL Control.

4 Focus adjustment

(1) Receive signal 94A with a full screen “E” characters.

(2) Set user Contrast control to its maximum.

(3) Set user Brightness control so that the back ground raster is just diminished.

(4) Adjust S-Focus control on the FBT so that focus at the middle points between the center of the screen to its

best.

(5) Adjust D-Focus control on the FBT so that focus at four corners of the screen to its best.

D-FOCUS ( FOCUS 1 )

S-FOCUS ( FOCUS 2 )

SCREEN







 23 

WIRING DIAGRAM

24

15P-DSUB

R
G
B

H. SYNC
V. SYNC
SDA

SCL
DDC5V

BUFFER

R

R. G. B . GA I N CONT ROL

G

CL P

B

BLK

C ONT

R
G
B

VIDEO
OUT PUT

BKG
CONTROL

Sync on G Sep.

CONT C-CONT

S-BKG

ACL

BRT BKG S-BKG

CDT

VIDEO PWB

MAIN PWB

V. OUT

ACL

V.OUT

ROTATION

CONTROL

85 V

HEATER

FBT

G1

G2

G3-1

G3-2

EHV

DDC

O SD P W M

SYNC
PRIORITY
CONTROL

VBLK

MUTE

SCL

SDA

V.SYNCB

DSDA

DSCL

H.SYNCB

H.CLAMP

SOGCHK

HBLK

KEY
SW

MICON

HIGH
VOLTAGE

SOGCHK

H.OUT
V.OUT

SDA
SCL
MUTE

ROTATION

LIMIT

HUNLK

H.CENT
H.SIZEC
FHTOV

CS1 - CS6

AC SW

MEMORY

DEGAUSS

6.3V

(HEATER)

SWITCHING

POWER
SUPPLY

SELECTOR

(MPU)

5V

RECTIFIER

H.SYNCB
V.SYNCB

H.IN
V.IN

DSDA
DSCL

MPU

KEY
SW

DG

PS1(STB)

PS2(MODE
O FF)

FUSE

FILTER

H.SYNCA
V.SYNCA

CHOPPER

SDA

SCL

HUNLOCK

B

SWITCHING

POWER
SUPPLY

FILTER

H. SYNCA

V. SYNCA

85V

54V

14V

CLBL

H. V. OSC

FOCUS

V.OUT

BDRV

BRETURN

H.FLB

HDRV

H. DRIVE
CONTROL

DRIVE

HIGH
VOLTAGE
CONTROL

X-RAY

HIGH
VOLTAGE
OUTPUT

HIGH
VOLTAGE
REG IC

EHV

EHV
RETURN

RETURN

+B
(DEF)

H. OUT
DRIVE

+B

H. OUT REG

H. OUT
REG
CONTROL

H.
RETURN

DF OUT

E

HV

REF.

H.CENT

CS6

CS1-5

ACL

H. OUT

G1
REGULATOR

SUB BKG

CS

COIL

+6.3V
HEATER

H. LIN
COIL

H. DY

SW

SM0401

BLOCK DIAGRAM

25

P.C.B.A ASSEMBLY

WARNING

1) This product contains components which are critical for X-radiation safety. Read the Service manual

carefully for proper replacement. Maximum 2nd anode voltage use high impedance meter, connect

(-) to chassis, use a high voltage lead from (+) to 2nd anode.

2) Critical Components are marked with the symbol of

in the material list. For continued protection

against X-radiation, replace only with same type and rating components.

3) Critical Components are marked with the symbol of # in the material list. For continued protection

against Low Radiation, replace only with same part number.

4) This symbol warns the personnel that un-insulated voltage within the unit may have sufficient



magnitude to cause electric shock.

Therefore, it should be read carefully in order to avoid any problems.







26

THE UPDATED PARTS LIST

FOR THIS MODEL IS

AVAILABLE ON ESTA

SM0401

Deflection/Power/MCU Circuit (Main)

39

SM0401

Video Circuit

40

SM0401

MECHANICAL DISASSEMBLY

42

SM0401

ELECTRICAL DISASSEMBLY

43

SM0401

DISPLAY UNIT ASSEMBLY

44

Attachment A

Page 1 of 5

Procedure to fix the Screen VR on FBT of CM771

1.Preparation

(1) Solder tool with flat head.(Refer to Photo 1 and 2)

2.Operation

(1) Chassis adjustment should be completed.

(2) Attach the head of solder tool softly on the right side of Screen VR knob together with

FBT body for approximately 5 seconds to melt them. (Refer to Photo 3 and 4)

(3) Attach the head of solder tool softly on the left side of Screen VR knob together with

FBT body for approximately 5 seconds to melt them. (Refer to Photo 5 and 6)

(4) Attach the head of solder tool on the top of Screen VR knob for approximately 7

seconds to melt it. (Refer to Photo 7 and 8)

(5) Check Screen VR can not be turned and the G2 voltage is within 600+/-10V.

45

Attachment A

Page 2 of 5

Photo 1. Head of solder tool (Side view)

Photo 2. Head of solder tool (Top view)

46

Attachment A

Page 3 of 5

Photo 3. Melting right side of VR knob together with FBT body

Photo 4. Melting right side of VR knob together with FBT body (Done)

47

Attachment A

Page 4 of 5

Photo 5. Melting left side of VR knob together with FBT body

Photo 6. Melting left side of VR knob together with FBT body (Done)

48

Attachment A

Page 5 of 5

Photo 7. Melting top of VR knob

Photo 8. Melting top of VR knob (Done)

49

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HITACHI Europe AB
Box 77 S-164 94 Kista

SWEDEN

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HITACHI EUROPE LTD (Norway) AB
STRANDVEIEN 18
1366 Lysaker
NORWAY
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HITACHI EUROPE AB

Neopoli / Niemenkatu 73
FIN-15140 Lahti

FINLAND

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HITACHI EUROPE LTD

Na Sychrove 975/8
101 27 Praha 10 – Bohdalec

CZECH REPUBLIC

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