Sony Betacam SX DNW-A100 Maintenance Manual page 258

6-2. APR-12 Board Replacement
7. LAU PB Phase Adjustment
Measuring equipment: Oscilloscope (X-Y mode)
(1) Connect and set the oscilloscope as follows:
CH-1: Pin 2 (X) of AUDIO OUTPUT CH1 connector
CH-2: Pin 2 (X) of AUDIO OUTPUT CH2 connector
However, when the optional kit BKNW-105 is equipped in the DNW, connect CH1 and CH2 to
MONITOR OUTPUT L and R connectors respectively.
CH-1: Pin 2 (X) of MONITOR OUTPUT L connector
CH-2: Pin 2 (X) of MONITOR OUTPUT R connector
n
An XLR-to-pigtail cable is very convenient to connect between the oscilloscope and the above-
mentioned connectors. Prepare two XLR-to-pigtail cables for this adjustmemnt.
And connect the XLR plug end of the cable to the above mentioned connector and the pigtailed end
to the oscilloscope. The cables for CH1 and CH2 shall be the same in length and have the same wire
color on the pigtailed end.
(2) For the DNW-A100/A50/A45, playback the 10 kHz, _10 VU portion (3:00 to 4:55) of the alignment
tape CR8-1A.
For the DNW-A100P/A50P/A45P, playback the 15 kHz, 0 VU portion (3:00 to 4:55) of the align-
ment tape CR8-1B PS.
(3) Observe the lissajous waveform on the oscilloscope.
(4) Align the vertical and horizontal amplitudes of lissajous waveform to 60 mm square with the
VOLTS/DIV and VAR controls of the oscilloscope.
(5) Minimize the phase difference A of lissajous waveform.
Adjustment point: 1RV603/APR-12(F-1)
Specification: A < 5.2 mm (Refer to Figure 2.)
Oscilloscope
60 mm
60 mm
Figure 2. Waveform of LAU PB Phase Adjustment
6-20
[GND: Pin 1(G)], AC
[GND: Pin 1(G)], AC
[GND: Pin 1(G)], AC
[GND: Pin 1(G)], AC
A
RV502
RV500
S500
RV501
A
COR100
+4 –3
0 –20
RV101
TP100
COR300
16 18 20
COR301
UNITY (L) VAR (L)
COR302
TP300
RV300
E300
B C D APR–12
A No.
E500
RV504
TP501 TP601
TP500
RV603
RV503 RV604
COR200
RV103
TP101
RV100 RV200
COR101
+4 –3
0 –20
20 18 16
RV201
RV102 E100
TP200
COR400
16 18 20
COR401
UNITY (R) VAR (R)
COR402
+4 +4
TP400
0 0
–3 >EP–GW< –3
–20 –20
RV400
E400
APR-12 Board (Side A)
E F G
LOTNO, S NO,
E600
RV605
1
RV602
TP600
RV600
S600
RV601
2
RV203
TP201
COR201
E200 3
20 18 16
RV202
TP700 TP560
4
5
TP701 6
7
DNW-A100/A50/A45
DNW-A100P/A50P/A45P