Adjustments - Sony Trinitron GDM-200PS Service Manual

• Landing Rough Adjustment
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" = 128
• Landing Fine Adjustment
1. Put the set inside the Helmholtz coil.
2. Input the single green signal and set the CONT control to
MAX.
<Landing adjsutment luminance>
Landing adjsutment after 2 hours of aging by Landing adjustmet
luminance.
• Landing ajdustment luminance
: 1/2 of Landing between COOL and HOT
(Reference: IK = 200 µA)
• Max luminance
2
: 120 cg/m IK = 650 µA
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.
(1) Adjust in a non-magnetic field. BV=55uT (SH Model).
(2) 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. Pull the TLH plate nooked on stopper.
6. Attach the sensor of the landing adjustment unit on the CRT
surface.
7. With landing checker adjsut DY position, punity, DY tilt,
DY center and landing of hte 4 corners. Purity Adjsutment
use 2-pole Mg on DY side.
8. Fasten DY with screw.
Note: Torque 22 ±2kg·cm (2.2 ± 0.2 Nm)
Perform auto degaussing.
SECTION 4

ADJUSTMENTS

<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.
* Adjustment and measurement should be made at the points one
inch inside the fluorescent screen.
Fixing DY with wedges.
c
9. Adjust vertical swing with vertical pins, and also adjust hori-
zontal swing so that horizontal keystone and vertical tilt are
optimum, then fix with four wedges.
(When fixing DY with wedges, insert wedges completely so
that the DY does not shake.)
Note:
(1) Do not paste more than 2 magnets to one corner.
(2) Paste within 80 to 100 mm from the DY on the diagonal line
of the magnet.
<How to drive in wedges>
10. Check the landing of each corner, and if they do not satisfy
the specification, paste a Disk-Mg onto the funnel and ad-
just.
11. If using the magnet, be sure to demagnetize with the hand
degausser and check.
12. Remove the sensor and wobbling coil.
13. Check that the DY is not tilting, and fix the purity Mg with a
white pen.
4-1
GDM-200PS/200PST/200PST9
0 ± 5 0 ± 7.5 0 ± 5
0 ± 5 0 ± 5
0 ± 5 0 ± 7.5 0 ± 5
± 7
± 7
± 7
10
10
10
a
"a" and "b" must be equal, and
"c" and "d" must be almost equal.
d
b
Apply a locking agent to the up-
per wedges only.
In such a case, apply agent so that
it enters both sides of wedge and
also inside the DY.
(µm)
0 ± 5
(µm)
± 7 ± 7
± 5 ± 7
± 7 ± 7
(µm)
10 10
7 10
10 10