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Part Replaced (    ) 

HV ADJ

RV501

Part Replaced (    ) 

D Board   

T501, IC501, RV501, R540,
R541, R542, R544, R564, R567,
R568, C532, C534, C539, C553,
C554, C555, C556, C558, C561

HV Regulator
Circuit

D Board   

T501, R510, R543, R547, R549,
R552, R595, D515, D517, C540,
C542, C544, IC607, IC901, C951  

HV HOLD
DOWN Circuit 

D Board   

T501, R545, R546, R548, R550,
R596, R934, C535, C541, IC605,
IC607, IC901  

Beam Current
Protector Circuit

1. ConÞ rm that the voltage between cathode of D517 and GND is 

more than 27.0 VDC.

2.  Using an external DC Power supply,  apply the volt age shown below 

between cathode of D517 on D Board and GND, and conÞ rm that 
the HV Hold-Down circuit works (Raster disappears).  Apply DC 
Voltage: Less than 35.9 VDC.

       Check Condition
       • Input voltage:     120 ± 2 VAC
       • Input signal:       (fH =69 kHz), White Cross Hatch
       • Controls:            CONT (max) &  BRT (center)
       • B+ Voltage:        179 ± 3.0 VDC

1.  Using an external current source, apply < 1.55mA between pin 

11

 

of FBT (T501) and GND, and conÞ rm that the raster fades out.

       Check Condition
       • Input voltage:     120 ± 2 VAC
       • Input signal :      (fH = 69 kHz), White Cross Hatch
       • Controls:            CONT (max) &  BRT (center)
                                            

 

 

 

1.  Input white cross hatch (fH = 69 kHz) signal.
2.  CONT (max) &  BRT (center).
3.  Input voltage: 110 ± 10 VAC.
 

Note:  Use NF power supply or make sure that dis tortion factor is 
3% or less.

4. ConÞ rm that the voltage is within the range shown below:

Standard voltage: 179 ± 3.0 VDC 

 

Allow the unit to warm up for one minute prior to checking the 
following conditions.

1.  Input white cross hatch signal (fH = 80 kHz).
2.  CONT maximum and BRT center.
3.  Cut off Screen VR (G2).
4.  Input voltage: 120 ± 2 VAC.
5. ConÞ rm that the voltage is within the voltage range shown below:
 

  

Standard voltage: 26.0 +0.3, -0.5 kV

6.  When replacing components identiÞ ed by Y , make sure to recheck 

the High Voltage.

7.  Verify the High Voltage as shown above (26.0  +0.3, -0.5 kV) is 

within speciÞ cation.  If not, set H. SIZE data at  minimum (-127) 
and then adjust RV501 on D Board (Adjustment target = 26.0 ± 
0.2 kV).

8.  After adjusting the High Voltage within speciÞ cation, put the RV 

cover on RV501 as shown below and apply sufÞ cient amount of RTV 
around RV501.

RV501

104

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

adjustments.

1.  Display the all white pattern.
2.  Adjust the contrast to maximum value.
3.  Display plain green pattern.
4.  Slide the DY back and roughly adjust the plain green pattern  with 

the purity magnet so that it is centered on the screen.

5.  Adjust HCENTER by HCENTER Volume (RV502 on D Board).
6.  Moving the DY forward, adjust so that an entire screen be comes 

pure green.

7.  Adjust the DY tilt and lightly tighten the DY screw.

1.  Place the monitor in the Helmholtz coil.
2.  Set TLH plate to zero position.
3.  Display plain green pattern.
4.  Degauss CRT face and iron parts with  degauss equipment or hand-

degausser. 

5.  Perform auto degauss. 
6.  Attach a wobbling coil to the speciÞ ed position of CRT neck.
7.  Put the sensor of landing checker to CRT face. 
8.   Adjust purity, DY position and DY tilt.
9. Tighten 

DY 

screw.

10.  Perform auto degauss.
11.  Adjust top and bottom pin by pitching DY up and down with two 

wedges so that [a] is equal to [b].

[a]

[b]

12.  Adjust top and bottom pins to zero with TB. H.PIN VR.  Also, V.SIZE 

should be adjusted at the same time becasue it is changed by TB. 
H.PIN VR.

Connect the communication cable of the connector located on the D Board on the monitor. Run the service software and then follow the instructions.

13.  Adjust V.Key (= H.Trapezoid) with H.TRP VR so that [a] is equal to 

[b] (See Section 3-4.).

14.  If the corner landing is out of speciÞ cation, use a disk magnet for 

the landing correction.

15.  If disk magnets were used, perform an auto degauss.
16.  Remove the wobbling coil and sensor.
17.  Fix the purity magnet on DY with white paint.

1.  Enter the white crosshatch signal.
2.  Roughly adjust the horizontal (H.STAT) and vertical (V.STAT) 

convergence at four-pole magnet.

3.  Roughly adjust HMC and VMC at six-pole magnet.

6-pole

Mg

4-pole

Mg

TLH Plate

TB Pin VR

YCV VR

CRT

DY

XCV VR

TLV VR

H-TRP VR

Purity 

Magnet

Neck Ass'y

A Board

1.  Display crosshatch pattern with green lines and black Þ eld.
2.  Adjust V. Key (=H. Trapezoid) with H.TRP VR so that [a] is equal 

to [b].

[a]

[b]

3.  Adjust the TB Pin with TB Pin VR.

IBM at Computer

as a Jig

1

2

3

1-690-391-21

A-150-919-A

Interface Unit

3-702-691-01
Connector Attachment

To BUS CONNECTOR

D-Sub

(9 Pin [female])

Mini Din

(8 Pin)

4 Pin

4 Pin

4 Pin

* The Parts above (          ) are necessary for DAS Adjustment.

1

3

-

 

4.  Adjust V.SIZE with "VSIZE".
5.  Change "CONV_SW" to "0" and "MCR2" to "153".
6.  Display crosshatch pattern with red and blue lines and  black Þ eld.
7.  Adjust H.STAT and V.STAT with 4 pole magnet.  Use 4 pole magnet, 

not "HSTAT" and "VSTAT".

 

1

1

1

1

1

1

2

2

2

2

2

2

R

B

R

B

R

R

R

R

B

B

B

B

8.  Display crosshatch pattern with white lines and black Þ eld.
9.  Adjust HMC and VMC with 6 pole magnet.

 

1

2

2

1

G

G

10.  Display crosshatch pattern with red and blue lines and black Þ eld.
11.  If necessary, repeat steps 5-8.
12.  Change "CONV_SW" to "6".
13.  Adjust H.TILT with TLH plate. 
 

R B

B R

14.  Adjust XCV with XCV VR.
 

B

R

15.  Adjust YCH with YCH VR.
 

R

B

16.  Adjust V.TILT with TLV VR.
 

R

B

B

R

17.  If necessary, repeat steps 3-14 to make the optimum condition for 

the entire screen.

18.  Fix 4-pole magnet, 6-pole magnet, TLH plate and XCV VR with 

white paint.

 

Purity

4-Pole Mg

6-Pole Mg

B

b

A

a

a

b

B

A

234 312

fH

0kHz

2.0 mm

2.0 mm

fH 60kHz

2.4 mm

2.4 mm

1.  Adjust Focus (V) and Focus (H) for optimum focus.

Focus (V)

Focus (H)

Convergence (Low) Mode
1.  Adjust the H.STAT and V.STAT with "HSTAT" and "VSTAT".
2.  Change "CONV_SW" to "7".

 A. 

Horizontal 

Convergence

9

17

1

19

11

5

6

10

18

2

20

12

CBH-T-LO

MBH-T-L-LO

APH-L-LO

MBH-B-L-LO

CBH-B-L-LO

CBH-T-R-LO

MBH-T-R-LO

APH-R-LO

MBH-B-R-LO

CBH-B-R-LO

YBH-B-LO

HSTAT

YBH-T-LO

B. Vertical 

Convergence

 

13

21

3

23

15

7

8

14

22

4

24

16

CCV-T-L-LO

MCV-T-L-LO

XBV-L-LO

MCV-B-L-LO

CCV-B-L-LO

V STAT-B-LO

V STAT

V STAT-T-LO

CCV-T-R-LO

MCV-T-R-LO

XBV-R-LO

MCV-B-R-LO

CCV-B-R-LO

3.  Repeat the procedure of A and B so that the convergence of the 

entire screen is within the speciÞ cation.

Convergence (High) Mode
1.  Adjust the H.STAT and V.STAT with "HSTAT-HI" and "VSTAT-HI".

 A. 

Horizontal 

Convergence

 

9

17

1

19

11

5

6

10

18

2

20

12

CBH-T-HI

MBH-T-L-HI

APH-L-HI

MBH-B-L-HI

CBH-B-L-HI

CBH-T-R-HI

MBH-T-R-HI

APH-R-HI

MBH-B-R-HI

CBH-B-R-HI

YBH-B-HI

HSTAT-HI

YBH-T-HI

 B. 

Vertical 

Convergence

 

13

21

3

23

15

7

8

14

22

4

24

16

CCV-T-L-HI

MCV-T-L-HI

XBV-L-HI

MCV-B-L-HI

CCV-B-L-HI

V STAT-B-HI

V STAT-HI

V STAT-T-HI

CCV-T-R-HI

MCV-T-R-HI

XBV-R-HI

MCV-B-R-HI

CCV-B-R-HI

Adjust each misconvergence point in sequence.

2.  Repeat the procedure of A and B so that the convergence of the 

entire screen is within the speciÞ cation.

3.  Change "MCR2" to "170".

B

A

312 mm

234 mm

        

A Zone:
Primary Mode      Others
H: < 0.25 mm       H: < 0.3 mm
V: < 0.25 mm       V: < 0.3 mm

B Zone:
Primary Mode      Others
H: < 0.3 mm         H: < 0.4 mm
V: < 0.3 mm         V: < 0.4 mm