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1

 Turn up one side of the rubber cap in

the direction indicated by arrow  a .

3

 When one side of the rubber cap

separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of  arrow  c .

 

2

 Use your thumb to pull the rubber

cap firmly in the direction indicated
by arrow  b .

WARNING: High voltage remains in the CRT even after the power is disconnected.  To avoid electric shock, discharge CRT

before attempting to remove the anode cap.  Short between anode and CRT coated earth ground strap.

NOTE:

After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal
chassis, CRT shield, or carbon painted on the CRT.

1

 Do not use sharp objects which may cause damage to the

surface of the anode cap.

2

 Do not squeeze the rubber covering too hard to avoid damag-

ing the anode cap. A material fitting called a shatter-hook ter-
minal is built into the rubber.

3

 Do not force turn the foot of the rubber cover. This may cause

the shatter-hook terminal to protrude and damage the rubber.

High voltage remains in the CRT even
after the power is disconnected.  To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap.  Short between anode and CRT
coated earth ground strap.

Coated Earth

Ground Strap

8)

After adjusting the High Voltage within specification,

put the RV cover on RV501 as shown below and apply

sufficient amount of RTV around RV501.

1)

Confirm that the voltage between cathode of D517 an

GND is more than 27.5 VDC.

2)

Using an external DC Power supply,  apply the voltage

shown below between cathode of D517 on "D" and GND,

and confirm that the HV Hold-Down circuit works. (Raster

disappears) Apply DC Voltage: Less than 35.8 VDC.

• 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 !¡ of FBT (T501) and GND, and confirm that the

raster fades out.

• Input voltage

: 120 

±

 2 VAC

• Input signal

: (fH = 69 kHz), White Cross Hatch

• Controls

: CONT (max) &  BRT (min)

d) B+ Voltage Check

1) Input white cross hatch (fH = 69 kHz) signal.

2) CONT (max) &  BRT (center)

3) Input voltage: 120 

±

 2 VAC

Note:  Use NF power supply or make sure that

distortion factor is 3% or less.

4) Confirm that the voltage is within the voltage

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 = 69 kHz)

2)

CONT maximum and BRT center

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: 26.9 KV 

±

 0.4 KV

6)

When replacing components identified by   , make

sure to recheck the High Voltage.

7)

Verify the High Voltage as  shown above (26.9 KV 

±

0.4 KV) is within specification.  If not, set H. SIZE data

at minimum (-127) and then adjust RV501 on "D" Board.

Part Replaced (   )

RV501

HV ADJ

Part Replaced (   )

D board

T501, IC501, RV501, 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

HV HOLD
DOWN Circuit

D board

T501, R545, R546, R548, R550,

R596, R934, C535, C541,

IC605, IC607, IC901

Beam Current
Protector Circuit

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

IBM AT Computer

as a Jig

1-690-391-21

1

A-1500-819-A
Interface Unit

2

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

1. Display the all white pattern.

2. Adjust the contrast to maximum value.

3. Display the 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. Moving the DY forward, adjust so that an entire screen

becomes pure green.

6. Adjust the tilt of DY and tighten lightly with a clamp.

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 specified 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].

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

instructions.

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

12. If the corner landing is out of specification, use a disk

magnet for the landing correction.

13. If disk magnets were used, perform an auto degauss.

14. Remove the wobbling coil and sensor.

15. 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.

CRT

Neck Ass’y

A Board

Purity

Magnet

XCV VR

6-pole

Mg

TLH Plate

DY

4-pole

Mg

H-Trp VR TLV VR

YCV VR

1. Display crosshatch pattern with green lines and black field.

2. Adjust V. Key (=H. Trapezoid) with H-Trp VR so that [a]

is equal to [b].

3. Change "CONV_OFF_NDX" to "7".

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

4. Display crosshatch pattern with red and blue lines and

black field.

5. Adjust H.STAT and V.STAT with 4 pole magnet.  Use 4

pole magnet, not "HSTAT" and "VSTAT".

6. Display crosshatch pattern with white lines and black field.

7. Adjust HMC and VMC with 6 pole magnet.

8. Display crosshatch pattern with red and blue lines and

black field.

9. If necessary, repeat steps 5-8.

10. Change "CONV_OFF_NDX" to "3".

11. Adjust H.TILT with TLH plate.

12. Adjust XCV with XCV VR.

13. Adjust YCH with YCH VR.

14. Adjust V.TILT with TLV VR.

15. If necessary, repeat steps 3-14 to make the

optimum condition for the entire screen.

16. Fix 4-pole magnet, 6-pole magnet and XCV VR

with white paint

R  B

B  R

b

b

a

a

A

B