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2-6

CN602

CN601

CN604

CN1102

CN312

CN311

CN318

CN319

CN320

CN316

CN315

CN303

CN1103

CN1400

CN1500

CN1401

CN605

CN701

CN501

CN1601

CN1600

CN1602

CN2

CN1

CN1

5P

CN3

CN1003

CN904

CN2601

4P

4P

D board

A1 board

N board

L2 board

Magnetic sensor

US board

H1 board

Picture tube

AC inlet (3P)

3-1

HV Regulator
Circuit Check

HV Protector
Circuit Check

Beam Current
Protector Circuit
Check

When replacing or repairing the shown below table, the

following operational checks must be performed as a

safety precaution against X-rays emissions from the unit.

Part Replaced (

[)

RV901

HV ADJ

*

Confirm one minute after turning on the power.

1) Turn the RV901 slowly, and adjustment so that high

voltage is in the specified range.

[Specification]: 27.00 ± 0.05 kV

2) Check that the voltage of D912 cathode on the D

board is 17.0 V or more.

1) Using external DC Power Supply, apply the voltage

shown below between cathode of D912 and GND,

and check that the RASTER disappers.

[Specification]: 19.95 + 0.00/– 0.05 V

1) Connect constant current source to a section between

T901 (FBT) qa pin and GND, and check that the

RASTER disappers when the specified current flows

to the qa pin.

[Specification]: 2.12 + 0.00/– 0.01 mA

Part Replaced (

])

D Board C925, IC901, R901,

R902, R905, R924,
R925, R926, RV901,
T901 (FBT)
• Mounted D Board

D Board C920, C923, D911,

D912, R903, R917,
R918, R919, R920,
R923, T901 (FBT)
• Mounted D Board

N Board IC1001, RB1001

• Mounted N Board

D Board C930, D917, R921,

R932, R933, R935,
T901 (FBT)
• Mounted D Board

N Board IC1001, RB1001

• Mounted N Board

•

1. Display all white pattern (or black dot pattern).
2. Set contrast to 255.
3. Display green plain pattern.
4. Side back DY and roughly adjust green plain pattern to be

centered on the useful screen with Purity Magnet.

5. Adjust DY tilt.
Note: Set ROTATION to 128 and LCC_NS to 128 when

adjusting DY tilt.

6. LIghtly tighten the DY screw.

•

Note: (1) After adjust W/B (9300k), measure the average of

IK with all white video input, while CONTRAST is

maximum and BRIGHTNESS is center. And
adjustment shall be made so that the miss-landing
become least after aging 2H with the IK 30% of
measured value shown above.

(2) The magnetic field shall be BH = 0.
(3) When adjusting at other than BH = 0, calculate the

shifted value from BH = 0.

1. Put the monitor in helmholz coil.
2. Set as follows;

LCC_SW = 0

(LCC Correction Current = 0)

FUNCTION_SW bit1 =

(Auto Degauss = On)

CONTRAST = 255

3. Display green plain pattern.
4. Degauss the iron part of chassis with a hand degausser and

degauss coil.

5. Degauss CRT face with a hand degausser again.
6. Input AC 230V to AC IN and turn the monitor off and on.

Then auto-degauss works.

7. Reset FUNCTION_SW bit1 to 0 (auto-degauss = off)
8. Degauss CRT face with a hand degausser again.
9. Attach wobbling coil to the specified place on CRT neck.
10. Put on landing sensor to CRT face.
11. Set LCC_SW to 12.
12. With landing checker, adjust DY position, purity, DY center

and landing of the 4 corners.

13. Read VX and VY value which are the read out of magnetic

sensor, and write to "LCC_VX_REF" and "LCC_VY_REF".

14. Adjust landing by LCC_NS, LCC_LT, LCC_LB, LCC_RT,

and LCC_RB. Adjustment of registers shall be limited
within the following range.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40

Set LCC_SW to 13, and Perform Service Save.

17. Adjust top and bottom pins correction VR.
18. Adjust the horizontal trapezoid distortion by DY horizontal

trapezoid correction VR.

19. Check landing at each corner and in case not in specification,

adjust landing of 4 corners with "LCC_NS", "LCC_LT",
"LCC_LB", "LCC_RT", and "LCC_RB". The limitations of
registers are shown below.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40

20. Remove the sensor and wobbling coil.
21. Switch signals to R, G, and B, and then check that the pure

colors have good color purity.

22. Fix purity magnets with white paint.

4-1

15. Tighten DY screw within specified torque, and auto-

degauss.

Note: Torque 22 ± 2 kgcm (2.2 ± 0.2Nm)
16. Adjust the vertical angle of DY to make top and bottom pins

equal (a = b). The horizontal angle shall not be changed
(straight). Settle DY upright without leaning, and insert
wedges firmly so that DY shall not move.

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

(µm)

10

10

10

10

7

10

10

10

10

(µm)

The red and blue must be within
the specification given right with
respect to the green.

A difference between red and blue
must be within the specification
given right.

<Specifications>
Adjust so that the green is within
the specification given right.
4 corner adjust target : within ± 1

0 ± 3 0 ± 7.5 0 ± 3

0 ± 3 0 ± 7.5 0 ± 3

0 ± 3 0 ± 7.5 0 ± 3

(µm)

a

b

c

d

<How to place wedge>
Green plain crosshatch pattern

a and b should be equal.
c and d should be equal.

Plaster RTV to both sides for the upper wedge.

Make sure that they settle inside DY.

Plaster RTV to one side for other wedges.

4-2

Connect the communication cable of the computer to the connector located on the D board. Run the service software and then follow
the instruction.

IBM AT Computer

as a Jig

1-690-391-21

1

A-1500-819-A
Interface Unit

2

*The parts above (                ) are necessary for DAS adjustment.

1

3

D-sub
(9 Pin [female])

mini Din
(8Pin)

4 Pin

3-702-691-01
Connector Attachment

3

To BUS CONNECTOR

4 Pin

4 Pin

•

(1) Display white crosshatch pattern.
(2) Pile the convex parts of 6-pole magnet for convergence

together.

(3) Roughly adjust H.CONV and V.CONV with 4-pole magnet.

•

1. 9300 K

x = 0.283 ± 0.005
y = 0.298 ± 0.005

(All White)

2. 6500 K

x = 0.313 ± 0.005
y = 0.329 ± 0.005

(All White)

3. 5000 K

x = 0.346 ± 0.005
y = 0.359 ± 0.005

(All White)

•

•

Adjust the focus volume 1 and 2 for the optimum focus.

•

B

a

a     1.8 mm
b     1.8 mm

a

b

b

A

MODE

A

B

4 : 3

388

291

B

A

A

0.20 mm

B

0.24 mm

V

XBV

XCV

B

R

B

R

R
B

B
R

R

B

B

R 

TLV

TLH

YBH

YCH

R B

R B

H.TRAP

TB-PIN

TLH

XCV

Purity

4-pole magnet

6-pole magnet

2-pole magnet

Focus 1

Focus 2

FBT