Sony TRINITRON GDM-1601 Service Manual page 28

OV
GIR Level
lJ
L
-45 ±2 V
Fig. 2-1-3
2) Coarse adjustment
(1)
Set the CONT VR to minimum.
(2) Adjust the SCREEN (G2) VR so that the back-
ground of the screen disappears.
(3) Adjust the RV404 (G-BKG) and RV405 (B-BKG)
for dark level white balance.
(4) Set the CONT VR to maximum.
(5) Adjust the RV402 (G-DRV) and RV403 (B-DRV)
for the high-light white balance.
(6) Repeat from
(1)
to (5) until getting the good
white balance. (This adjustment need not be
precise.)
2-2. Beam Landing Coarse Adjustment
If you use the CRT of FRU provided by SONY, you
need not do adjustments decribed below.
1)
Input a full white signal (or equivalent signal).
2) Rotate the CONT VR fully clockwise.
3) Project only green (switch off SG Rand B channel
outputs).
4) Adjust SCREEN (G2) VR to obtain appropriate
brightness.
5) Move the DY backward and make a coarse adjust-
ment with the purity magnet so that the green raster
is at the screen center. (see Fig. 2-2-1)
6) Move the DY forward and adjust so that the entire
screen turns green.
7) Adjust the DY tilt.
8) Lightly fix the DY with the DY fixing bracket.
R
G
B
Fig. 2-2-1
4-2
2-3. Focus Adjustment
If you use the CRT of FRU provided by SONY, you
need not do adjustments described in the item 6),7),
8).
I) Receive a white hatch signal.
2) Draw DQP/NTC connector.
3) Adjust the focus operating RV902 (FOCUS VR).
4) Switch off the SG green switch.
5) Adjust the H convergence of red and blue in the
picture center by H START YR.
6) Impress 500 mADC to the DQP terminal of NTC
from the outside.
7) Switch on and off the external power supply switch
to move the NTC longitudinally. Fix the NTC with
screws in a place where the convergence does not slip.
8) Disconnect the connector from the external power
supply and connect the connector DQP/NTC.
9) Connect oscilloscope intersecting point of L2 and
C41 (L board) and adjust L2 so that SIN wave to
maximum.
10) Switch on a green signal and adjust the focus operat-
ing RV6, 7, and 8 on the L board.
Fig. 2-3-1