Sony bg3r chassis kv-ar25m86 Manuales De Servicio

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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 WHB 04 "GCT" and WHB 05 "BCT" with [1] and

[4], and adjust the level with [3]  and [6] for the best
white balance.

5) Set the PICTURE to maximum.
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.

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

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.

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

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:
175 V 

± 2 (VDC)

second from the right

Black

White