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3

When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling up it in
the direction of the arrow 

c

.

1

Don’t hurt the surface of anode-caps with shartp shaped material!

2

Don’t press the rubber hardly not to hurt inside of anode-caps!
A material fitting called as shatter-hook terminal is built in the
rubber.

3

Don’t turn the foot of rubber over hardly!
The shatter-hook terminal will stick out or hurt the rubber.

NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT,

after removing the anode.

1

Turn up one side of the rubber cap in
the direction indicated by the arrow 

a

.

2

Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow 

b

.

2-2

     

Demagnetic coil

12

13

     

Tension spring

2

  

 

  

A board

GND

GND

CN506

GND

GND

CN308

CN307

Two 
degaussing
coil holders

14

CN501

CN603

Two screws
(+BVTP 4 x 16)

5

     

Stand assy

4

3 Claw

Bottom cover
(D board)

7

6 Claw

Cushion

Two degaussing
coil holders

15

1

  

 

  

Anode cap

     

Picture tube

11

     

Deflection yoke

9

     

Neck assy

8

     

Four screws
(Tapping screw 5)

10

Connector
(2pin)

2-3

CN901 CN902

CN504

CN603

CN605

CN301

CN310

CN505

CN506

CN501

FBT

Picture tube

Demagnetic coil

D board

A board

CN302

CN305

CN303

CN309

CN304

CN307

CN306

CN308

Part Replaced (

[

)

RV501

HV ADJ

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.

•

Confirm that the voltage between cathode of D521 on D

board and GND is more than 28.5 V DC and Using ex-

ternal DC Power Supply, apply the voltage shown below

between cathode of D521 and GND, and confirm that

the HV HOLD DOWN circuite works. (TV Rester dis-

appears)

Standard voltage  :  Less than 34 V DC

• Input voltage : 100 – 120 V AC

• Input signal

: White Cross hatch at Max fH

• Beam control : CONT : 255, BRT : 80

•

Connect a variable resistor (250 k

Ω

 or more) and an am-

meter in series between FBT pin 1 on D board and

GND. Decrease gradually the resistance of the variable

resistor from maximum to minimum, and confirm that

the Beam Current Protector Circuite works (TV Rester

disappears). The current must be within the range shown

below.

• Standard current  :  Less than 1.50 mA

• Input voltage : 100 – 120 V AC

• Input signal

: White Cross hatch at Max fH

• Beam control : CONT : 255, BRT : 80

•

Standard voltage : 152 

±

 5.0 V DC

• Input voltage : 100 – 120 V AC

Note : Use NF power supply or make sure that

distortion factor is 3% or less.

• Input signal

: White Cross hatch at 64.0 kHz

• Beam control : CONT : 255, BRT : 80

HV Regulator
Circuit Check

HV Hold-down
Circuit Check

Beam Current
Protector Circuit
Check

*

Confirm one minute later turning on the power.

3-1

Part Replaced (

]

)

D board IC502, IC503, C501,

C535, C553, C597,
C598, R592, R593,
R596, RV501,
T501 (FBT)

D board IC501, D521, C585,

C599, R598, R599,
R5C7, T501 (FBT)

D board Q533, D592, C590,

C591, C598, R5A5,
R5C0, R5C3, L502,
T501 (FBT)

•

< Measurement condition >

Magnetic field : BH=0, BV=45

µ

T

CRT size : 270 

× 

202

Measurement point : 240 

× 

180

Temperature : 25ºC (after aging for 12 hours)

< Adjustment target>

1) The value shall be within the following spacification after

0.5 hours of aging in the product condition, all white and
with luminance 100cd/m^.

-2

-1

1

-1

0

0

1

0

-1

Connect the communication cable of the computer to the connector located on the D board on the monitor.  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

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

3

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

2) The value shall be within the following spacification after

3 hours of aging in product condition, 1/2

Σ

 1K (not in-

cluding dark current).

0

0

0

0

0

0

0

0

0

Tolerance +/- 7.

1.

Put the set inside the Helmholtz coil.

2.

Input the single green signal.

3.

Demagnetize the CRT surface with the hand degausser.

4.

Attach the wobbling coil to the designated part of the CRT
neck.

5.

Attach the sensor of the landing adjustment unit on the CRT
surface.

6.

Adjust the DY position and purity, and the DY tilt.

7.

Fasten DY with screw.

Note: Torque 22 

±

2kgcm (2.2 

±

 0.2Nm)

NECK Assy

6Pole Mg

P.S Mg

XBV

DY

CRT

4Pole Mg

•

Set DY four-pole magnet at mechanical center
before adjustment.
This should be prime mode.

Correcting XBV
In case

R

Space between two tabs
shall be less than 10mm
or 15 

°

.

B

B

R

Open 4 pole magnet of DY, Be careful don't not to change H-
STAT.

In this case

1) Open 4 pole magnet of DY. Shall not change HSTAT.
2) Re-adjust V-STAT with 4 pole magnet of neck ass'y.
Don't not perform the XBV correction excessively unless other-
wise necessary.

4-1