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2-6

CN802

CN803

CN801

CN891

CN604

CN5003

CN5004

CN5002

CN5001

CN509

CN673

CN672

CN671

GND

GND

CN605

CN603

CN520

CN507

CN503

CN504

CN506

CN501

CN508

CN502

GND

CN512

CN511

CN1

CN402

CN403

CN407

CN405

CN401

CN406

CN2

G board

L2 board

AC inlet

A2 board

I/O terminal board assy

D board

Rear shield

Picture tube

J board

H5 board

H6 board

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.

1) Confirm that the voltage of the pin 2 of CN901 on

D board is within the voltage range shown below.

Standard: 9.00 ± 0.065 VDC

1) Confirm that the HV protector circuit works and TV

Raster disappears when apply the voltage as shown

below between pin 3 of CN901 on D board and

GND using an external DC power supply.

Check Condition: Less than 34.10 VDC

1) Measure HV voltage and record that value.

2) Shorted between pin 1 and pin 4 of CN901 on D

board.

3) Connect to the Constant Current Jig (A) between pin

1 of CN901 on D board and GND, confirm that the
Beam Current Protector Circuit works and HV go

down more than 1.25 kV from the value of (1).

Check Condition: 1.50 mA

1) Connect to the Constant Current Jig (B) between pin

1 of CN901 on D board and GND, confirm that the
Beam Current Protector Circuit works and TV Ras-

ter disappears.

Check Condition: 1.59 mA

1) Confirm that the voltage of pin 3 of CN901 on D

board is within the voltage range shown below.

Standard: more than 28.0 VDC

Input voltage : 100 ~ 240 VAC

Input signal : White Cross Hatch at 107 kHz

Beam control : BRT and CONT 

→

 Minimum

B+ voltage

: 180 VDC

Part Replaced (

])

D Board IC901, T902 (FBT)

•

 Mounted D board

D Board Q660,

Q661,

D916,

D935,

C924,

R665,

R667,

R940,

R980,

T902 (FBT)

•

 Mounted D board

G Board PH680, Q680,

Q683,

D680,

R680,

R685,

R686,

R687,

R688,

R689

•

 Mounted G board

D Board IC901, D904,

D907,

D908,

R011,

R908,

R909,

R921,

R925,

R926,

R929,

R930,

T902 (FBT)

•

 Mounted D board

HV Regulator
Circuit Check

HV Protector
Circuit Check

Beam Current
Protector Circuit
Check

3-1

•

1. Enter the full white signal. (or the full black dots signal).
2. Adjust the contrast to the maximum.
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. 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. (“LCC SW” = “12”)
2. Input the single green signal and set the CONT control to

MAX.

Note: After the W/B adjustment with 9300K, measure an aver-

age of 

Σ

Ik when a full white signal is entered in the CONT

MAX/BRT CENT status. Then make adjustment so that
the specified screen can be attained after aging for 2 hours
with Ik equivalent to 30% of the average value.

3. Demagnetize the metal part of the chassis with the hand de-

gausser and coil degausser, and the CRT surface with the
hand degausser.
Input AC 230V to AC IN, turn on and off the power to per-
form auto degaussing. (Perform auto degaussing by setting
“MON CON REG2”=152. Return to the original value after
use.)
Demagnetize the CRT surface with the hand degausser
again.

Note:
(1) Hand degauss must be used on stand-by or power-off condi-

tion.
This model has an automatic earth magnetism correction
function by using an earth magnetism sensor and a LCC coil.
When using a hand degauss while monitor (LCC coil) is be-
ing operated, it sometimes gets magnetized, and the system
may not work properly as a result.

(2) Adjust in a non-magnetic field. BV=45uT.
(3) If adjusting in a magnetic fields, add the shift from the non-

magnetic field in your estimation.

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

 ± 6

 ± 6

 ± 6

 ± 4

 ± 6

 ± 6

 ± 6

 ± 6

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

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.

0 ± 3 0 ± 7.5 0 ± 3

0 ± 5 0 ± 5

0 ± 5

0 ± 3 0 ± 7.5 0 ± 3

(µm)

(µm)

10

10

10

10

7

10

10

10

10

(µm)

* Adjustment and measurement should be made at the points

one inch inside the fluorescent screen.

7. For the up/down swing, swing the DY and insert a wedge so

that the up and down pins are equal at the top and bottom.
Adjust the DY TLV VR so that the horizontal trapezoid is
equal at the left and right. Insert the wedge firmly so that the
DY does not shake.

8. Check the landing of each corner, and if it does not satisfy

the specification, adjust the landing of four corners using
“LCC LT“, “LCC LB”, “LCC RT” and “LCC RB”.
However, the register adjustment must be limited within the
following range.

“LCC NS”

128 ± 15

“LCC LT”, “LCC LB”, “LCC RT”, “LCC RB”

128 ± 40

After adjustment, save the service data.

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.

4-1

6. Adjust the DY position and purity, and the DY tilt, and land-

ing of the center and 4 corners with the landing checker.
After adjustment, set “LCC SW” to “13”.

•

Write terrestrial magnetism sensor reading VX and VY to
“LCC VX” and LCC VY” respectively. Adjust the land-
ing by moving “LCC NS”, “LCC LT”, “LCC LB”, “LCC
RT” and “LCC RB”. However, the register adjustment
must be limited within the following range.
“LCC NS”

128 ± 15

“LCC LT”, “LCC LB”, “LCC RT”, “LCC RB”

128 ± 40

Save the service data.

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

•

(1) Receive an image of the white crosshatch signals (white

lines on black).

(2) Place the protrusions of the 6-fold poles magnet attached to

the CRT neck upon each other. (Fig. 1)

(3) Make rough adjustment of the H and V direction conver-

gence by using 4-fold poles magnet.

(4) Make a rough adjustment of the V direction convergence by

using “V. STAT”.

Protrusions

60

°

Fig. 1

Fig. 3

Fig. 2

TLV
YCH
YBH

XBV
XCV
APH

*

* Set so that the protruding parts of

the 2 magnet rings agree with
each other.

•

(1) 9300K

x = 0.283 ± 0.005
y = 0.298 ± 0.005

(All White)

(2) 6500K

x = 0.313 ± 0.005
y = 0.329 ± 0.005

(All White)

•

•

Adjust the focus volume 1 and 2 (HDK 1 and 2) for the opti-
mum focus.

XBV

XCV

R

B

B

R

R

B

B

R

B

B

R 

H. AMP

H. TILT (TLH)

YBH

YCH

R B

R B

R

•

4-2

B

A

Phospher edge

V

H

MODE

fH>

60 kHz

fH<

60 kHz

Zone

A Zone

B Zone

C Zone

A Zone

B Zone

C Zone

N. Hemisphere

0.24 mm

0.24 mm

0.32 mm

0.24 mm

0.32 mm

0.36 mm

S. Hemisphere

0.24 mm

0.28 mm

0.32 mm

0.28 mm

0.36 mm

0.40 mm

C

B

a

a     3.2 mm
b     3.2 mm

a

b

b

A

MODE

A

B

388 mm

291 mm

1, 2

FBT

HDK1 (V)

HDK2 (H)