Focus Adjustment; G2 (Screen) And White Balance Adjustments - Sony KV-HF21M50 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 C3/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 5-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select GCT (WHB 4) and BCT (WHB 5) with
[3]
adjust the level with and
5) Set the PICTURE to maximum.
6) Select GDR (WHB 1) and BDR (WHB 2) with
[3]
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
[1]
4) Select SBR (WHB7) with
[3] [6]
level with and so that the second stripe from the right is
dimly lit.
White
second from the right
Black
KV-HF21M50/XF21M80
175 V ±2(VDC)
0 V
[1] [4]
and , and
[6]
for the best white balance.
[1] [4]
and , and
[6]
for the best white balance.
[MUTING] [0]
then .
[4]
and , and adjust SBR (WHB7)
RM-952