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1. Offset Level Adjustment
Measuring equipment: Oscilloscope
n
More than 20 minutes should elapse after turning the power on, when this adjustment is performed.
(1) Short-circuit TP101/APR-12(B-3) and E100/APR-12(C-3) with a shorting clip.
(2) Short-circuit TP201/APR-12(F-3) and E200/APR-12(G-3) with a shorting clip.
(3) Connect and set the oscilloscope as follows:
CH-1: TP700/APR-12(G-3), DC 5 V/DIV, 2 us/DIV
CH-2: TP701/APR-12(G-6), DC 5 V/DIV
Trigger: CH-2, _ slope
(4) Adjust 1RV103/APR-12(D-2) so that the audio CH1 part of the waveform at TP700 makes the same
waveform to the Figure 1 (left side).
(5) Adjust 1RV203/APR-12(G-2) so that the audio CH2 part of the waveform at TP700 makes the same
waveform to the Figure 1 (right side).
Oscilloscope
TP701
16-Bit
TP700
(OK)
Audio CH1
NG
Figure 1. Waveform of CH1/CH2 Offset Level Adjustment
(6) Disconnect the shorting clips from TP101, TP102,
E100, and E200.
DNW-A22/A22P
4-Bit
16-Bit
4-Bit
Audio CH2
A
B
C
D
A No.
E500
RV504
RV502
TP501
TP500
RV500
S500
RV503
RV501
TP101
RV103
COR101
20 18 16
E100
COR300
16 18 20
COR301
UNITY (L)
VAR (L)
UNITY (R)
COR302
+4
TP300
0
–3
>EP–GW<
–20
RV300
E300
APR-12 Board (Side A)
6-2. APR-12 Board Replacement
APR–12
E
F
G
LOTNO,
S NO,
E600
RV605
TP601
1
RV602
TP600
RV603
RV600
S600
RV604
RV601
2
TP201
RV203
COR201
E200
3
20 18 16
TP560
TP700
4
COR400
16 18 20
COR401
VAR (R)
5
COR402
+4
TP400
0
–3
–20
RV400
E400
6
TP701
7
6-13
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