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6-2. APR-12 Board Replacement
6. LAU PB Phase Adjustment
Measuring equipment: Oscilloscope (X-Y mode)
(1) Connect and set the oscilloscope as follows:
CH-1: Pin 2 (X) of MONITOR OUTPUT L connector [GND: Pin 1(G)], AC
CH-2: Pin 2 (X) of MONITOR OUTPUT R connector [GND: Pin 1(G)], AC
n
An XLR-to-pigtail cable is very convenient to connect between the oscillscope and above-mentioned
connectors. Prepare two XLR-to-pigtail cables for this adjustment.
And connect the XLR plug end of the cable to MONITOR OUTPUT connector and the pigtailed end
to the oscilloscope.
The cables CH-1 and CH-2 shall be the same in the length and have the same wire color on the
pigtailed.
(2) For the DNW-A22, playback the 10 kHz, _10 VU portion (3:00 to 4:55) of the alignment tape CR8-
1A.
For the DNW-A22P, playback the 15 kHz, 0 VU portion (3:00 to 4:55) of the alignment 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 different 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
6-18
A
A
RV502
RV500
S500
RV501
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
RV103
TP101
COR101
20 18 16
E100
COR400
16 18 20
COR401
UNITY (R)
VAR (R)
COR402
+4
+4
TP400
0
0
–3
–3
>EP–GW<
–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
TP700 TP560
4
5
TP701
6
7
DNW-A22/A22P
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