Analog Audio Offsets (Ch1/2) Adjustment (Apr-12 Board) - Sony DNW-A100 Maintenance Manual

3-6. Audio System Adjustment (APR-12/13 Boards)
3-6-6. Analog Audio Monitor Outputs (L/R) Adjustment (APR-12 Board)

3-6-7. Analog Audio Offsets (CH1/2) Adjustment (APR-12 Board)

Output Level Adjustment
1. To enter the maintenance mode, press S1101(G-1) on
the SS-63 board.
2. In C23 : AUDIO TEST SG of the maintenance mode,
select "1KHz SINE 0VU" as test signal.
3. Set the audio analyzer as follows:
Function mode: LEVEL, dBm (600 Z)
Input filter: 80 kHz LPF
L channel adjustment
4. Connect the audio analyzer's input to MONITOR
OUTPUT L connector.
5. Adjust the audio level on the audio analyzer.
1RV300/APR-12(A-5)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
R channel adjustment
6. Connect the audio analyzer's input to MONITOR
OUTPUT R connector.
7. Adjust the audio level on the audio analyzer.
1RV400/APR-12(E-5)
Adj. point:
Specification: +4.0 ± 0.1 dBm (at 600 Z load)
8. To exit the maintenance mode, press the MENU
button once.
A B C
A No.
E500
RV504
RV502
TP501
TP500
RV500
S500
RV503
RV501
COR100
RV103
TP101
RV100
COR101
+4 –3
0 –20
RV101
20 18 16
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)
3-24
D APR–12 E F G
LOTNO, S NO,
E600
RV605
TP601
RV602
TP600
RV603 RV600
S600
RV604
RV601
COR200
RV203
TP201
RV200
COR201
+4 –3
0 –20
RV201
E200
20 18 16
TP560
RV202
TP200
TP700
COR400
16 18 20
COR401
UNITY (R) VAR (R)
COR402
+4
TP400
0
–3
–20
RV400
E400
TP701
3-6-7. Analog Audio Offsets (CH1/2)
Adjustment (APR-12 Board)
Preparing tools
. Oscilloscope:
TEKTRONIX 2465B or equivalent
. Extension board: EX-556 (Part No. A-8277-212-A)
. Shorting clip
Preparation
1. Check that the shorting plug settings on the
APR-12 board are factory settings.
(Refer to "Shorting plugs setting" in Section 3-6-2.)
2. Extend the APR-12 board with an extension
board EX-556.
n
Wait more than 30 seconds after turning off the power,
then remove the APR-12 board.
3. Check the settings on the upper control panel.
PB (audio level) controls: CH1 8 PRESET
4. Check the setting on the sub control panel.
EMPHASIS switch
5. Check that the equipment has warmed up.
Before starting the adjustment, warm up the VTR and
oscilloscope through the power for 20 minutes or more.
A B
A No.
E500
RV504
RV502
1
TP501
TP500
RV500
S500
RV501
2
TP101
COR100
RV100
+4 –3
0 –20
3
RV101
RV102
TP100
4
COR300
16 18 20
COR301
5
UNITY (L) VAR (L)
COR302
+4
TP300
0
–3 >EP–GW<
–20
RV300
E300
6
7
APR-12 Board (Side A)
CH2 8 PRESET
8 OFF
C D APR–12 E F
LOTNO, S NO,
E600
RV605
TP601
RV602
TP600
RV603
RV503 RV604
RV601
TP201
COR200
RV103
RV200
COR101 COR201
+4 –3
0 –20
20 18 16 20 18 16
RV201
RV202
E100
TP200
COR400
16 18 20
COR401
UNITY (R) VAR (R)
COR402
+4
TP400
0
–3
–20
RV400
E400
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
G
1
RV600
S600
2
RV203
E200
3
TP560
TP700
4
5
6
TP701
7