Read Sony KV-AR25M80A Service Manual online
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KV-AR25M80A
RM-952
2. WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 3-1: ADJUSTMENTS
1) Set to Service Mode (Refer Section 3-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select WHB 04 "GCT" and WHB 05 "BCT" with [1] and
3) Set the PICTURE to minimum.
4) Select WHB 04 "GCT" and WHB 05 "BCT" with [1] and
[4], and adjust the level with [3] and [6] for the best
white balance.
white balance.
5) Set the PICTURE to maximum.
6) Select WHB 01 "GDR" and WHB 02 "BDR" with [1] and [4],
6) Select WHB 01 "GDR" and WHB 02 "BDR" with [1] and [4],
and adjust the level with [3] and [6] for the best white
balance.
balance.
7) Write into the memory by pressing [MUTING] then [0].
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black to white from the pattern
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 WHB 07 "SBR" with [1] and [4], and adjust WHB 07
"SBR" level with [3] and [6] so that the second stripe from the
right is dimly lit.
right is dimly lit.
2-4. 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 C6 board cathode to the
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C6 board cathode to the
oscilloscope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the
value below.
5) Adjust G2 (screen) on the FBT until picture shows the point
before cut off.
0 V
Cathode setting voltage:
180 V
180 V
± 2 (VDC)
second from the right
Black
White
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