Adjustments - Sony GDM-90W01T5 Service Manual

GDM-90W01T5
z 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. Adjust the brightness is easy to see with the G2 resistor.
5. Reverse the DY, and adjust coarsely the purity magnet so
that a green raster positions in the center of screen.
6. Moving the DY forward, adjust so that an entire screen be-
comes monogreen.
7. Adjust the tilt of DY, and fix lightly with a clamp.
z Landing Fine Adjustment
1. Put the set inside the Helmholtz coil.
2. Input the single green signal and set the CONT control to
MAX.
Note: Set to 1k=300 µA with the signal green signal, and after
aging for about 30 minutes, adjust so that it is exactly this
value.
3. Before making any adjustment, confirm that respective
preadjustment values of the registers listed below have
been entered correctly.
LCC K TEMP
LCC K EW C
LCC K NS C
LCC K NS
LCC K NS FOR ROT 64 LCC VY
LCC K ROT FOR NS 46 LCC K VY NS
LCC K POL
LCC WO
Also, confirm that "LCC NS=LCC LT=LCC LB=LCC
RB=LCC RT=128"
4. Send the "LCC READ" command of the ECS.
If the ECS command cannot be used, execute the status read-
ing and VX, VY and V TEMP values may be entered to
"LCC VX", "LCC VY" and "LCC TEMP" respectively.
5. Execute the service saving.
6. 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 REG 2"=152. Return to the original value after
use.)
Demagnetize the CRT surface with the hand degausser
again.
Note: Hand degauss must be used on stand-by or power-off con-
dition.
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 being operated, it sometimes gets magnetized, and the
system may not work properly as a result.
7. Attach the wobbling coil to the designated part of the CRT
neck.
8. Attach the sensor of the landing adjustment unit on the CRT
surface.
SECTION 4

ADJUSTMENTS

100 LCC R TOL 128
105 LCC SW7
0 LCC TEMP 151
160 LCC VX
255 LCC P TOL 128
128
#=Input values in time adjustments
9. Adjust the DY position and purity, and the DY tilt, and land-
ing of the center and 4 corners with the landing checker.
Note:
(1) Adjust in s non-magnetic field. BV=35uT.
(2) If adjusting in a magnetic fields, add the shift from the non-
magnetic field in your estimation.
<Specification>
1
5
6
3 7
Adjust the green of corners 1 to 4, and center 6 to ±5 µm, and red
and blue to within ±7 µm of green, and the difference between
red and blue to within ±10 µm.
Adjust the green of 5 and 7 to within ±10 µm, and red and blue to
within ±7 µm of green, and the difference between red and blue
to within ±10 µm.
(Set each corner to 1st frame of the crosshatch.)
10. For the up/down and left/right swing, swing the DY and in-
7
sert a wedge so that the up and down pins are equal at the top
and bottom and the horizontal trapezoid is equal at the left
#
and right. Insert the wedge firmly so that the DY does not
#
shake.
0
11. Check the landing of each corner, and if they do not satisfy
the specification, paste a Disk-Mg onto the funnel and ad-
just.
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.
(3) If using the magnet, be sure to demagnetize with the hand
degausser and check.
(4) If the specification cannot be satisfied though the adjustment
of 11 was made, the following adjustment may be made.
a) Adjust the "LCC xx" register that corresponds to the part
to be adjusted. (See the following figure)
Note : "LCC NS" =108~148
except for "LCC NS"=114~142
b) Execute the service saving.
"LCC LT" "LCC NS" "LCC RT"
"LCC LB" "LCC NS" "LCC RB"
(5) If performing a manual degaussing after adjustment of "LCC
xx", set "LCC xx" to 128 (of "LCC SW" to 0).
(After degaussing, return the adjustment value to original
value.)
12. Remove the sensor and wobbling coil.
13. Switch the signal to R.G.B., and check that each color is
pure.
14. Check that the DY is not tilting, and fix the purity Mg with a
white pen.
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