Sony DNW-A100 Maintenance Manual page 66

3-6. Audio System Adjustment (APR-12/13 Boards)
3-6-9. LAU PB System Adjustment (APR-12 Board)
CH1 adjustment (METAL)
for DNW-A100P/A50P/45P only
8. Connect the audio analyzer's input to AUDIO OUT-
PUT CH1 connector.
When the VTR is equipped with BKNW-105 (optional
kit), connect the audio analyzer to MONITOR OUT-
PUT L connector.
9. During play back the 1 kHz, _20 VU portion (5:00 to
5:55) of the alignment tape CR8-1B PS in PLAY
mode, measure the audio level on the audio analyzer.
This measured audio level is a reference level (0 dB).
10. During play back the following specified portions
(_20 VU) of the CR8-1B PS in PLAY mode, check or
adjust the dB ratio in response to each frequency
portion.
Playback portion Specification [dB]
5:00 to 5:55 (1 kHz) Measured audio level is a reference level (0 dB).
+0.7
6:00 to 6:25 (40 Hz) C.V.
_1.7
C.V. ±0.3
6:30 to 6:55 (7 kHz)
C.V. ±0.4
7:00 to 7:25 (10 kHz)
C.V. ±0.5
7:30 to 7:55 (15 kHz)
The correction values (C.V.) are given on the label of the alignment tape.
A B C
A No.
E500
RV504
TP501
TP500
RV500
S500
RV502 RV503
RV501
COR100
RV103
TP101
RV100
COR101
+4 –3
0 –20
20 18 16
RV101
RV102 E100
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)
3-30
D APR–12 E F G
LOTNO, S NO,
E600
RV605
TP601
TP600
RV603 RV600
S600
RV604 RV602
RV601
COR200
RV203
TP201
RV200
COR201
+4 –3
0 –20
E200
20 18 16
RV201
RV202
TP200
TP700 TP560
COR400
16 18 20
COR401
UNITY (R) VAR (R)
COR402
+4
TP400
0
–3
–20
RV400
E400
TP701
CH2 adjustment (METAL)
for DNW-A100P/A50P/45P only
11. Connect the audio analyzer's input to AUDIO OUT-
PUT CH2 connector.
When the VTR is equipped with BKNW-105, connect
the audio analyzer to MONITOR OUTPUT R connec-
tor.
12. During play back the 1 kHz, _20 VU portion (5:00 to
5:55) of the CR8-1B PS in PLAY mode, measure the
audio level on the audio analyzer.
This measured audio level is a reference level (0 dB).
13. During play back the following specified portions
(_20 VU) of the CR8-1B PS in PLAY mode, check or
adjust the dB ratio in response to each frequency
portion.
Adjustment point
—
(Check only)
(Check only)
(Check only)
CH-1: 1RV502/APR-12(A-1)
CH-2: 1RV602/APR-12(G-1)
4. LAU Dolby Level Adjustment
CH1 adjustment
1. Connect the audio level meter to TP501(C-1) on the
APR-12 board. GND: E500/APR-12(B-1)
2. Play back the 1 kHz, 0 VU portion (0:00 to 2:55) of
the following alignment tape in PLAY mode.
For DNW-A100/A50/A45:
For DNW-A100P/A50P/A45P: CR8-1B PS
1
3. Adjust the audio level on the audio level meter.
1RV503/APR-12(C-1)
Adj. point:
2
Specification: _10.0 ± 0.2 dBu (0 dBu = 0.775 V rms)
3
CH2 adjustment
4. Connect the audio level meter to TP601(E-1) on the
4
APR-12 board. GND: E600/APR-12(F-1)
5. Play back the 1 kHz, 0 VU portion (0:00 to 2:55) of
the CR8-1A / CR8-1B PS in PLAY mode.
5
6. Adjust the audio level on the audio level meter.
Adj. point: 1RV604/APR-12(E-1)
6
Specification: _10.0 ± 0.2 dBu (0 dBu = 0.775 V rms)
7
CR8-1A
DNW-A100/A50/A45
DNW-A100P/A50P/A45P