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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

1

2

     Two screws

(+BVTP 4 x 16)

     A board

     Neck assy

     Four screws

(Tapping screw 5)

     Deflection yoke

     Picture tube

     Anode cap

Cushion

Bottom cover
(D board)

     Stand assy

3

Claw

6

Claw

4

5

     Two screws

(+BVTT 4 x 8)

7

13

12

8

9

     Picture tube 

shield

11

10

Connector
(2pin)

CN506

CN501

CN603

GND

GND

CN307

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

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)

1

2

1

2

B

R

1

2

R

B

B

R

1 2

+

R

B

1

2

B

R

R

B

1 2

+

1.

Receive R.B. cross-hatch.

2.

Adjust H.STAT and V.STAT at four-pole magnet.

•

1.

Enter the full white signal.

2.

Adjust the contrast to the maximum.

3.

Make the screen monogreen.

4.

Reverse the DY, and adjust coarsely the purity magnet so
that a green raster positions in the center of screen.

5.

Moving the DY forward, adjust so that an entire screen be-
comes monogreen.

6.

Adjust the tilt of DY, and fix lightly with a clamp.

•

1.

Place the set in the Helmholtz coil.

2.

Enter a green signal only.

3.

Degauss the entire screen with hand-degausser.
Then auto degauss it.

4.

Attach a wobbling coil to the specified position of CRT
neck.

5.

Attach a landing adjuster sensor on the CRT.

6.

Using a landing checker, adjust the DY position, purity on
DY, tilt of DY.

7.

Clamp the DY screw.

Clamping torque: 22 

±

 2kgcm (2.2 

±

 0.2Nm)

•

1.

Enter the white crosshatch signal.

2.

Adjust roughly the horizontal and vertical convergence at
four-pole magnet.

3.

Adjust roughly HMC and VMC at six-pole magnet.

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

*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

•

Set DY four-pole magnet to mechanical center before adjust-
ment.
This should be prime mode.

4-1

Allow a 30 minute warm-up period prior to making the following adjustments.

NECK Assy

6Pole Mg

(Stable)
P.S Mg

DY

CRT

4Pole Mg

P.S Mg

Mechanic
Center

Set the
finger