GDM-F400, GDM-F400T9 - Sony Monitor Service Manual (repair manual). Page 21

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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 128.

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1. Put the set inside the Helmholtz coil. (“LCC SW” = “140”)
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=24uT.
(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. Adjust the DY position and purity, and the DY tilt, and land-

ing of the center and 4 corners with the landing checker.

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Moving the “LCC_NS” , adjust the landing at the Y end.

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Adjust the landing by moving “LCC NS”, “LCC LT”,
“LCC LB”, “LCC RT” and “LCC RB”. However, the reg-
ister adjustment must be limited within the following
range.
“LCC NS”

128 ± 20

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

128 ± 30

After adjustment, save the service data.

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<Specifications>
Adjust so that the green is within
the specification given right.
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. Insert wedges to make the DY neck stand upright without

moving it.
At this time, without shaking the DY, firmly insert the
wedges.

8. Adjust vertical swing with the vertical pin, and adjust hori-

zontal swing so that horizontal keystone and V TILT become
optimum, then fix with four wedges.
In Such a case, insert wedges tightly to eliminate a play of
DY.

4-1

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

the specification, paste a Disk-Mg onto the funnel and ad-
just.

(1) Do not paste more than two magnets on one corner.
(2) Magnets will be placed in a range 80 ~ 100 mm from the DY

along diagonal lines.

(3) After placing magnets, absolutely hand degauss and check

the results.  (Hand degauss must be used on stand-by or
power-off condition.)

10. Remove the sensor and wobbling coil.
11. Switch the signal to R.G.B., and check that each color is

pure.

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

white pen.  Fix wedges with RTV.

c

a

b

d

<How to fix with wedges>

<How to drive in wedges>

“a” and “b” must be equal, and

“c” and “d” must be almost

equal .

Apply an adhesive to the top

wedge only.  Apply it to both

sides of wedge and inside of DY.