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2-2

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

.

• Remove the D, A and J boards (Refer to 2-3.)

1

2

3

     Anode cup

Cushion

4

5

6

     Neck assy

     Deflection yoke

     Picture tube

     Picture tube shield

     Four screws

(Tapping screw 5)

When replacing parts shown in the table below, the follow-

ing operational chacks must be performed as a safety pre-

caution against X-ray emissions from the unit.

1) Using an external DC Power supply, apply the volt-

age shown below between cathode of D517 on “D”

Board and GND, and confirm that the HV Hold-

Down circuit works. (Raster disappears)

Apply DC Voltage: 31.4 ± 0.01 VDC

• Input voltage : 120 ± 2 VAC

• Input signal

:(fH = 64 kHz), White Cross Hatch

• Controls

: CONT (max) & BRT (center)

• B+ Voltage

: 182.5 ± 3.0 VDC

1) Using an external DC power supply, apply the volt-

age 8.8 ± 0.01 VDC between pin !¡ of FBT (T501)

and GND, and confirm that the voltage across C541

is 3.7 VDC or less.

• Input voltage : 120 ± 2 VAC

• Input signal

:(fH = 64 kHz), White Cross Hatch

• Controls

: CONT (max) & BRT (center)

1) Input white cross hatch (fH = 64 kHz) signal.

2) CONT (max) & BRT (center)

3) Input voltage: 120 ± 2 VAC

Note: Use NF power supply or make sure that distor-

tion factor is 3% or less.

4) Confirm that the B+ voltage is within the voltage

range shown below.

Standard voltage: 182.5 ± 3.0 VDC

D BOARD

Part Replaced (

[

)

RV501 (HV ADJ)

Part Replaced (

]

)

IC501, IC605, IC901, D517, C535, C540, C541,
C542, C544, C553, C554, C555, C558, C561, R545,
R546, R547, R548, R549, R550, R552, R564, R567,
RV501, T501 (FBT)

3-1

* Allow the unit to warm up for one minute prior to check-

ing the following conditions:

1) Input white cross hatch signal. (fH = 64 kHz)

2) Minimum CONT and BRT controls.

3) Cut off Screen VR (G2).

4) Input voltage: 120 ± 2 VAC

5) Confirm that the voltage is within the voltage range

shown below.

Standard voltage: 25.0 ± 0.5KVDC

6) When replacing components identified by 

], make

sure to recheck the High Voltage.

7) Verify the High Voltage as shown above (25 ±

0.5KVDC) is within specification. If not, set H. SIZE

data at minimum (–127) and then adjust RV501 on

“D” Board.

8) After adjusting the High Voltage within specifica-

tion, put the RV cover on RV501 as shown below

and apply sufficient amount of RTV around RV501.

104

RV501

●

1.

Enter the full white signal.

2.

Set the contrast to “CONT”=255.

3.

Make the screen monogreen.

Note: Off the outputs from R ch and B ch of SG.
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.

Note: "TILT" shall be set at 0.

●

1.

Put the set inside the Helmholtz coil.

2.

Input the single green signal and set the CONT control to
MAX.

Note: Set to 

Σ

 1k=300 µA with the signal green signal, and after

aging for about 30 minutes, adjust so that it is exactly this
value.

3.

Demagnetize the CRT surface with the hand degausser , and
perform auto degaussing.

Note: Adjust in s non-magnetic field.
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, and land-
ing of the center and 4 corners with the landing checker.

Purity

Adjust the green of corners 1 to 4, and center 6 to ±5 µm, and
red and blue to within ±7 µm of green, and the difference be-
tween red and blue to within ±10 µm.
Adjust the green of 5 and 7 to within ±10 µm, and red and blue
to within ±7 µm of green, and the difference between red and
blue to within ±10 µm.

(Set each corner to 1st frame of the crosshatch.)

7.

For the up/down and left/right swing, swing the DY and in-
sert a wedge so that the up and down pins are equal at the top
and bottom and the horizontal trapezoid is equal at the left
and right. Insert the wedge firmly so that the DY does not
shake.

Signals: Inverted crosshatch signal (monochrome G)

and crosshatch signals (B and R)

“a” and “b” must be equal, and
“c” and “d” must be almost equal.

A and B, or A’ and B’ must be al-
most equal.

C and D, or C’ and D’ must be al-
most equal.

<How to drive in wedges>

Drive in wedges as shown in the
left figure, and apply RTV as
shown with hatched lines.

←

 As viewed from a neck side

8.

Check the landing of each corner, and if they do not satisfy
the specification, paste a Disk-Mg onto the funnel and ad-
just.

Note:
(1) Do not paste more than 2 magnets to one corner.
(2) Paste within 80 to 100 mm from the DY on the diagonal line

of the magnet.

(3) If using the magnet, be sure to demagnetize with the hand

degausser and check.

9.

Remove the sensor and wobbling coil.

10. Switch the signal to R.G.B., and check that each color is

pure.

11. Check that the DY is not tilting, and fix the purity Mg with a

white pen.

12. Fasten DY with screw.
Note: Torque 20 ±2kg·cm

<Specification>

A

B

A = B

c

a

b

d

B

R

A

R

B

B

A’

B’

or

RB

C

BR

D

C’

D’

or

1

2

4

3

6

7

5

4-1

4-2

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.

Fig. 1

<6 Pole Magnet>

Fig. 4

Fig. 3

Fig. 5

Tab B

Tab A

Adjust HMC

Adjust VMC

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

XBV

XCV

B

R

B

R

R

B

B

R 

H. TILT 

YBH

TLV

R B

YCH

B

R

R
B

R
B

A

312 mm

B

MODE

All mode

234 mm

a 

≤

 3.0 mm

b 

≤

 2.5 mm

a

B

A

b

B

A

A

0.30 mm

B

MODE

All mode

0.30 mm

Purity

4-pole Mg

4-pole Mg

6-pole Mg

XCV

TLH

TLV

YCH

Fig. 2

FOCUS 1

FOCUS 2

●

1.

Enter the white crosshatch signal (white lines on black).

2.

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

3.

Adjust  roughly HMC and VMC at six-pole magnet.
Standard: ± 0.1mm (In the center of screen)

4.

Make rough adjustment of the H direction convergence by
usig H. STAT VR (RV001 of A board).

●

●

(1) 9300K

x = 0.283 ± 0.005
y = 0.298 ± 0.005

(2) 5000K

x = 0.345 ± 0.005
y = 0.358 ± 0.005

●

●

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