Pal Vco Adjustment (Bd Board); Pal A/D Input Level Adjustment (Bd Board); Pal-S Phase Adjustment (Bd Board) - Sony BKM-21D Maintenance Manual

3-3-4. PAL VCO Adjustment (BD Board)

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The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu.
HOLD
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Set 02 CH.
3. Connect the oscilloscope to TP450 of the BD board.
(DC100 mV/div)
4. Adjust the HOLD data so that the DC voltage of
TP450 becomes _ 500 ± 100 mV.
3-3-5. PAL A/D Input Level Adjustment
(BD Board)
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The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu
A D LEVEL
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Set 02 CH.
3. Connect the oscilloscope to TP310 of the BD board.
(DC500 mV/div)
4. Adjust the A D LEVEL data so that the A/D input
level "A" satisfies the specifications.
A
Specification A = 3.45 V ± 5 mV
Fig. 3-3.
BKM-21D
3-3-6. PAL-S PHASE Adjustment
(BD Board)
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The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu.
PHASE OFFSET
PHASE
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Set 02 CH.
3. Connect the oscilloscope to TP601 of the BD board.
4. Check that the PHASE data is 128.
5. Adjust the PHASE OFFSET data so that the line
crawling A of the PR OUT signal of TP601 becomes
minimum.
A
0 V
Fig. 3-4.
3-13 (E)
A