Sony Betacam SX DNW-A100 Maintenance Manual page 262

6-3. APR-13 Board Replacement
1. Unity Level Adjustment
n
When the optional kit BKNW-105 is equipped in the
DNW, "Unity Level Adjustment" is not needed.
Measuring equipment: Audio analyzer
(dBm mesururmwnt mode, 80
kHz LPF)
n
More than 20 minutes should elapse after turning the
power on, when this adjustment is performed.
CH3 adjustment
(1) Input the audio signal 1 kHz, +4.0 dBm(600 Z) to
AUDIO INPUT CH3 connector.
(2) Connect the input of audio analyzer to AUDIO
OUTPUT CH3 connector.
(3) Perform adjustment.
Adjustment point: 1RV101/APR-13(C-1)
+4.0 ± 0.1 dBm (at 600 Z load)
Specification:
CH4 adjustment
(1) Input the audio signal 1 kHz, +4.0 dBm(600 Z) to
AUDIO INPUT CH4 connector.
(2) Connect the input of audio analyzer to AUDIO
OUTPUT CH4 connector.
(3) Perform adjustment.
Adjustment point: 1RV201/APR-13(F-1)
+4.0 ± 0.1 dBm (at 600 Z load)
Specification:
A B C
A No.
RV101
RV102
TP100
RV100 TP101
COR100
+4 –3
RV103
0 –20 E100
COR101
16 18 20
COR300 COR400 COR500
RV300 RV400
20 18 16 20 18 16 20 18 16
TP300 TP400
COR301 COR401
–20 –20
–3 –3
0 0
+4 +4
E300 E400
>EP–GW<
APR-13 Board (Side A)
6-24
D APR–13 E F G
LOTNO, S NO,
RV201
RV202
RV200
TP200
TP201
COR200
+4 –3
0 –20
RV203
E200
COR201
16 18 20
TP803 TP801
TP804 TP802
E800
COR600
RV500 RV600
20 18 16
TP500 TP600
COR501 COR601
–20 –20
–3 –3
0 0
TP701
+4 +4
E500 E600
TP700
2. 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-13(B-1) and E100/APR-
13(B-2) with a shorting clip.
(2) Short-circuit TP201/APR-13(F-1) and E200/APR-
13(E-2) with a shorting clip.
(3) Connect and set the oscilloscope as follows:
CH-1: TP700/APR-13(G-6), DC 5 V/DIV, 2 us/DIV
CH-2: TP701/APR-13(G-5), DC 5 V/DIV
Trigger: CH-2, _ slope
(4) Adjust 1RV103/APR-13(C-2) so that the audio CH3
part of the waveform at TP700 makes the same
waveform to the Figure 1 (left side).
(5) Adjust 1RV203/APR-13(F-2) so that the audio CH4
part of the waveform at TP700 makes the same
waveform to the Figure 1 (right side).
Oscilloscope
TP701
16-Bit
TP700
(OK)
Audio CH3
1
NG
2
3
Figure 1. Waveform of CH3/CH4 Offset Level Adjustment
4
(6) Disconnect the shorting clips from TP101, TP201,
E100, and E200.
5
6
7
4-Bit 16-Bit 4-Bit
Audio CH4
DNW-A100/A50/A45
DNW-A100P/A50P/A45P