Sony DNW-A100 Maintenance Manual page 62

3-6. Audio System Adjustment (APR-12/13 Boards)
3-6-8. Analog Audio Inputs (CH1/2) Adjustment (APR-12 Board)
1. Input Level Adjustment
1. Set the audio analyzer as follows:
Function mode: LEVEL, dBm (600 Z)
Input filter: 80 kHz LPF
CH1 adjustment
2. Short-circuit TP100 (A-3) and E100 (C-3) on the
APR-12 board with the shorting clip.
3. Input the audio signal (1 kHz, +4.0 dBm) to AUDIO
INPUT CH1 connector.
4. Connect the audio analyzer's input to AUDIO OUT-
PUT CH1 connector.
5. Adjust the audio level on the audio analyzer.
1RV100/APR-12(A-3)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
6. Remove the shorting clip on the APR-12 board.
7. Adjust the audio level on the audio analyzer.
1RV101/APR-12(A-3)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
CH2 adjustment
8. Short-circuit TP200(E-3) and E200(G-3) on the APR-
12 board with a shorting clip.
9. Input the audio signal (1 kHz, +4.0 dBm) to AUDIO
INPUT CH2 connector.
10. Connect the audio analyzer's input to AUDIO OUT-
PUT CH2 connector.
11. Adjust the audio level on the audio analyzer.
1RV200/APR-12(E-3)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
12. Remove the shorting clip on the APR-12 board.
13. Adjust the audio level on the audio analyzer.
1RV201/APR-12(E-3)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
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2. Distortion Rate Adjustment
1. Set the audio analyzer as follows:
Function mode: THD+N
Range: 2%
Input filter: 80 kHz LPF
CH2 adjustment
2. Input the audio signal (1 kHz, +23.5 dBm) to AUDIO
INPUT CH2 connector.
3. Connect the audio analyzer's input to AUDIO OUT-
PUT CH2 connector.
4. Adjust the distortion rate on the audio analyzer.
1RV202/APR-12(F-3)
Adj. point:
Specification: Minimize (0.10% or less: OK)
CH1 adjustment
5. Input the audio signal (1 kHz, +23.5 dBm) to AUDIO
INPUT CH1 connector.
6. Connect the audio analyzer's input to AUDIO OUT-
PUT CH2 connector.
7. Adjust the distortion rate on the audio analyzer.
1RV102/APR-12(C-3)
Adj. point:
Specification: Minimize (0.10% or less: OK)
A B C
A No.
E500
RV504
RV502
TP501
TP500
RV500
S500
RV503
RV501
RV100
COR100
TP101 RV103
COR101
+4 –3
0 –20
RV101
20 18 16
E100
RV102
TP100
COR300
16 18 20
COR301
UNITY (L) VAR (L)
COR302
+4
TP300
0
–3 >EP–GW<
–20
RV300
E300
APR-12 Board (Side A)
D APR–12 E F G
LOTNO, S NO,
E600
RV605
TP601
RV602
TP600
RV603
RV600
S600
RV604
RV601
RV200
COR200
RV203
TP201
COR201
+4 –3
0 –20
RV201
E200
20 18 16
RV202
TP200
TP700 TP560
COR400
16 18 20
COR401
UNITY (R) VAR (R)
COR402
+4
TP400
0
–3
–20
RV400
E400
TP701
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
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