Mic Level Adjustment; Mic1 Level Adjustment - Sony CCU-590 Maintenance Manual

4-11. MIC Level Adjustment

4-11-1. MIC1 Level Adjustment

Adjustment category: C
Measuring instruments: Oscilloscope, Audio generator
Preparation:
. AUDIO IN +48 V CH1/CH2 switch/CA rear panel →
OFF
. AUDIO IN CH1/CH2 switch/CA rear panel → REAR
MIC
. Input below signal from the audio generator to the CA
AUDIO IN CH1 connector. (Refer to "4-1-4. Audio
Connection".)
Signal name: Sine wave
Frequency: 1 kHz
Output level: 2.2 mV p-p (_60 dBu)
. CA MIC1 GAIN → _60 dB
. S203/AU-295 board → "0 dB"
Measurement point: Follow the steps below.
Note: TP205 (GND: E1) and
TP208 (GND: E1)/AU-295
board
Adjustment point: 1RV201/AU-295 board
B C
A
E2
1
S101
S103
S100
S107
S106
2
S104
E3
S108
S102 S105
RV100
3
RV101
S205
RV102
4
S204
RV203
RV204
5
4-40
D E
TP202
IC105
TP101
TP100
TP102
RV201
S207
RV200
TP210
S206
TP209
AU-295 BOARD (A SIDE)
Adjustment procedure:
1. Input 1 kHz/200 mV p-p sine wave from the audio
generator to e4 (GND: e5) on the extension board.
2. Adjust 1RV201 so that TP205 signal level becomes
"A".
A = 1100 ± 50 mV
3. Connect the oscilloscope to TP208, and check that the
signal level is 1100 ± 100 mV p-p.
F G H
RV202
E1
S201 S200
TP201 TP200
TP205
S203
TP208
TP203
S202
TP204
S4
S3
A
J
K
TP207
TP206
CN902
S2
S1
CCU-590/P/V1(E)