D1 Y/C Delay Adjustment (Bd Board) - Sony BKM-21D Maintenance Manual

3-5-3. D1 Y/C DELAY Adjustment
(BD Board)
1. Input the D1 100% color bar signal (525/60) to the
SDI-1 terminal.
2. Set 06 CH.
3. Set the data as follows at the BKM-21D menu of the
MAINTENANCE menu.
BB0 : 1 RB0 : 1
BB1 : 1 RB1 : 0
BB2 : 0
4. Connect the oscilloscope to the following measuring
points.
CH 1 : TP501 of the BD board (PB OUT)
CH 2 : TP601 of the BD board (PR OUT)
EXT.TRING. : Pin
(H SYNC)
5. Set the oscilloscope to the delay mode and enlarge the
border between yellow and cyan (Fig. 5-4 (1)).
(Setting the oscilloscope to the EXT.TRIG mode)
6. Using the vertical position knob of the oscilloscope,
adjust the vertical position of the PB OUT waveform
and PR OUT waveform as shown in Fig. 5-4 (2) and
(3).
7. Using the horizontal position knob, adjust the PR OUT
waveform center to the horizontal verticl center of the
oscilloscope.
8. Adjust the data as follows so that the horizontal
deviation A of the PB OUT waveform is within the
specification.
(If deviated to the left as shown in Fig.5-4 (2).)
BB2 : 0 → 1 → 1
BB1 : 1 → 0 → 0
BB0 : 1 → 0 → 1
(If deviated to the right as shown in Fig.5-4 (3).)
RB1 : 0 → 1
RB0 : 1 → 0
BKM-21D
YB0 : 0 YW0 : 0
YB1 : 0 YW1 : 1
YB2 : 0
20a of CN2 of the BD board
(1)
Enlarge the image of
the oscilloscope in the delay mode
(2)
PR
a
c
d
b
(3)
PR
a
c
d
b
A
Specification A = Below 30 nsec
Fig. 5-4.
PR OUT (TP601)
PB OUT (TP501)
Vertical center
of the oscilloscope
PB
Horizontal vertical center
of the oscilloscope
a = b
c = d
A
PB
Horizontal vertical center
of the oscilloscope
a = b
c = d
3-23 (E)