CPD-G420 (serv.man4) - Sony Monitor Service Manual (repair manual). Page 13

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

adjustments.

1.  Display the all white pattern.
2.  Set contrast to 255.
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 the DY tilt.
 NOTE:  Set ROTATION to 128 and LCC_NS to 128 when 

adjusting the DY tilt.

6.  Lightly tighten the DY screw.

NOTE:  (1) After adjusting W/B (9300k), measure the average of 

ΣΙΚ 

with all white video input, while CONTRAST is maximum 
and BRIGHTNESS is centered. Make the adjustments so 
that the miss-landing becomes least after aging 2H with 
the 

ΙΚ

 30% of measured value shown above.

 (2) 

The 

magnetic 

Þ eld shall be BH = 0.

 

(3) When adjusting at other than BH = 0, calculate the shifted 

value from BH = 0.

1.  Place the monitor in the Helmholtz coil.
2.  Set as follows;
 

LCC-SW = 0  (LCC Correction Current = 0)

 

FUNCTION_SW bit1 =   (Auto Degauss = On)

 CONTRAST 

= 

255

3.  Display plain green pattern.
4.  Degauss the iron part of the chassis with a hand-degausser and 

degauss coil. 

5.  Degauss the CRT face with degauss equipment or hand-

degausser. 

6.  Input AC 230V to AC IN and turn the monitor off and on to activate 

the auto degausser.

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

IBM at Computer

as a Jig

1

2

3

1-690-391-21

A-1500-819-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

~

7.  Reset FUNCTION_SW bit 1 to 0 (auto-degauss = off)
8 

Repeat step 5 by degaussing the CRT face with degauss 
equipment or hand-degausser. 

9.  Attach a wobbling coil to the speciÞ ed position of CRT neck.
10.  With landing checker, adjust DY position, purity, DY center, and 

landing of the 4 corners.

11.  Check landing of the 4 corners, and adjust using a magnet if they 

are not in the speciÞ cation.

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 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 ± 3 0 ± 7.5 0 ± 3

0 ± 3 0 ± 7.5 0 ± 3

(µm)

(µm)

10

10

10

10

7

10

10

10

10

(µm)

12.  Tighten DY screw within speciÞ ed torque, and auto-degauss.
 NOTE:  Torque 22 ± 2 kgcm (2.2 ± 0.2 Nm)
13.  Adjust the vertical angle of the DY to make the top and bottom 

pins equal (a = b). The horizontal angle is not changed (straight). 
Settle DY upright without leaning, and insert wedges Þ rmly so that 
the DY does not move.

a

b

c

d

<How to place wedge>
Green plain crosshatch pattern

a and b should be equal.
c and d should be equal.