Focus Adjustment; G2 (Screen) And White Balance Adjustments - Sony TRINITRON KV-XF21M83 Service Manual

(3) Screen-corner Convergence
b
a-d : screen-corner
misconvergence
c
Fix a Permalloy assy corresponding to the misconverged
areas.
Fix a Permalloy assy
corresponding to the
misconverged areas
a to d : Permalloy assembly

3-3. FOCUS ADJUSTMENT

Adjust FOCUS control on the flyback transformer for the best
focus.
FLYBACK TRANSFORMER (T503)
a
d
b
FOCUS
SCREEN
– 29 –
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C5 board cathode to the oscillo-
scope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the value
below.
5) Adjust G2 (Screen) on FBT until picture shows the point
before cut-off.
2. WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 4-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select GCT (WHB 4) and BCT (WHB 5) with
adjust the level with and
5) Set the PICTURE to maximum.
6) Select GDR (WHB 1) and BDR (WHB 2) with
adjust the level with and
7) Write into the memory by pressing
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black to white from the pattern
generator.
3) BRIGHTNESS .... 50%.
PICTURE ............ MINIMUM
4) Select SBR (WHB7) with
level with and so that the second stripe from the right is
dimly lit.
White
Black
KV-XF21M83/XF21M93
175 V 2(VDC)
0 V
and
for the best white balance.
and
for the best white balance.
then .
and , and adjust SBR (WHB7)
second from the right
RM-952
, and
, and