Adjustments - Sony GDM-400PS 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" shall be set at 128.
• Landing Fine Adjustment
1. Put the set inside the Helmholtz coil.
Set "LCC SW" at 0.
And check "LCC LT", "LCC LB", "LCC RT", "LCC RB" at
128.
2. Input the single green signal and set the "CONTRAST" to
MAX.
<Landing adjustment luminance>
Landing adjustment after 2 hours of aging by Landing ad-
justment luminance.
*Landing adjustment luminance
:same luminance on aging (Reference: SIK=250uA)
*Max luminance
: 110 ch/m SIK=750uA
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.
(When degaussing, set the current of LCC at 0.)
Note:
(1) Adjust in a non-magnetic field. BV=45uT.
(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. Adjust the DY position and purity, and the DY tilt, and land-
ing of the center and 4 corners with the landing checker.
Purity Adjustment use 2-pole magnet on DY side, Don't use
on Neck Assy one.
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.
8. Tighten DY screw.
Torque: 22±2 kgcm (2.2±0.2 Nm)
Auto-degauss it.
9. Adjustment each top and bottom pins by switching DY neck
up-down, and adjust V. TILT and horizontal trapezoid by
swinging DY neck right-left. And then fix with 4 wedges.
(Insert wedge certainly so that the DY will not loosen.)
Fixing DY with wedges.
c
<How to drive in wedges>
10. Check landing at each corner and in case not in specification,
adjust by sticking disk magnets on CRT funnel. (After plac-
ing disk magnets, absolutely hand degauss and check the re-
sults.)
11. Remove the sensor and wobbling coil.
12. Check that the DY is not tilting. Then, fix purity magnets
with white paint and fix wedge with RTV.
4-1
GDM-400PS/400PST/400PST9
0 ± 4 0 ± 7.5 0 ± 4
0 ± 4 0 ± 5
± 4
± 5
± 5
± 5
8
8
8
"a" and "b" must be equal, and
a
"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 ± 4 0
0 ± 7.5 0 ± 4
(µm)
± 5 ± 5
± 5 ± 5
± 5 ± 5
(µm)
8 8
7 8
8 8