3-9 (E)
BKM-21D
3-2-7. NTSC Y/C DELAY Adjustment
(BD Board)
1.
Input the composite NTSC 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2.
Set the data as follows at the BKM-21D menu of the
MAINTENANCE menu.
BB0 : 0
RB0 : 0
YB0 : 1
YW0 : 0
BB1 : 1
RB1 : 1
YB1 : 0
YW1 : 1
BB2 : 0
YB2 : 0
3.
Connect the oscilloscope to the following measuring
points.
CH1 : TP501 of the BD board (PB OUT)
CH2 : TP601 of the BD board (PR OUT)
EXT. TRIG. : Pin
20a
of CN2 of the BD board
(H SYNC)
4.
Set the oscilloscope to the delay mode and enlarge the
border between yellow and cyan (Fig. 2-8 (1)).
(Setting the oscilloscope to the EXT.TRIG mode)
5.
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. 2-8 (2) and
(3).
6.
Using the horizontal position knob, adjust the PR OUT
waveform center to the horizontal vertical center of the
oscilloscope.
7.
Adjust the data so that horizontal deviation A of the
PB OUT waveform is within the specification as
follows.
(If deviated to the left as shown in Fig. 2-8 (2). )
BB2 : 0
→
0
→
1
BB1 : 1
→
1
→
0
BB0 : 0
→
1
→
0
(If deviated to the right as shown in Fig. 2-8 (3). )
RB1 : 1
→
1
RB0 : 0
→
1
PR OUT (TP601)
PB OUT (TP501)
Vertical center
of the oscilloscope
Enlarge the image of
the oscilloscope in the delay mode
a
b
c
d
PR
PB
Horizontal vertical center
of the oscilloscope
a = b
c = d
A
Specification A = Below 35 nsec
Horizontal vertical center
of the oscilloscope
a = b
c = d
a
b
c
d
PR
PB
A
(1)
(2)
(3)
Fig. 2-8.
