Level Adjustment (Bw Board) - Sony BKM-142HD Maintenance Manual

2-6-3. Level Adjustment (BW Board)

Note 1: The following settings should be performed at the
BKM-127W menu of the MAINTENANCE menu.
ACC ON/OFF
PAL S/D
Note 2: The following adjustment menus are below the
BKM-127W menu of the MAINTENANCE menu.
Y LEVEL
PB LEVEL
PR LEVEL
ACC LEVEL
1. Input the PAL YC color bar signal.
(100% White Ref. 75% Saturation)
2. Connect the oscilloscope to TP261 of the BW board.
3. Adjust the Y LEVEL data so that the Y signal level
becomes 645 mV.
TP261 (Y)
645 ±10 mV
Y
Fig. 2-22.
4. Set PAL S/D to S and turn OFF ACC.
5. Connect the oscilloscope to TP421 of the BW board.
6. Adjust the PB LEVEL data so that the PB signal level
becomes 485 mV.
7. Turn ON ACC.
8. Adjust the ACC LEVEL data so that the PB signal
level becomes 485 mV.
TP421 (PB)
PB
485 ±10 mV
Fig. 2-23.
BKM-120D/127W/129X/142HD
9. Turn OFF ACC.
10. Connect the oscilloscope to TP471 of the BW board.
11. Adjust the PR LEVEL data so that the PR signal level
becomes 485 mV.
12. Set PAL S/D to D.
TP471 (PR)
PR
485 ±10 mV
Fig. 2-24.
2-11