Incom2 Demodulation Adjustment; Incom2 Level Adjustment - Sony CCU-590 Maintenance Manual

4-6-8. INCOM2 Demodulation Adjustment

Adjustment category: C
Note:
Perform this adjustment only
after replacing 1LV501 and/or
1LV502 on the TR-133B
board.
Measuring instruments: Oscilloscope, Audio generator
Extended board: TR-133B board
Preparation:
. Set the switches below on the AU-294 board of CA-590/
590P.
S3 (CM/DYM) → "DYM"
S4 (UNBAL) → "ON"
S5 (GAIN: +/0/_) → "0"
. Input 1 kHz/220 mV p-p sine wave signal from the audio
generator to the pin 2 (X) (GND: pin 3) of the INCOM2
connector (XLR pin 5) of CA-590/590P.
. Fig.1 (Refer to "4-1-4. Audio Connection".)
Measurement point:
TP501 (GND: E300)/TR-133B
board
Adjustment procedure:
1. Set the oscilloscope INPUT (AC/DC) mode to DC,
and connect the probe to TP501 (GND: E300) on the
TR-133B board. Then, turn slowly the 1LV501 (7.4M
TUNE 1) core up to 1.24 ± 0.02 V dc while watching
the oscilloscope screen.
2. Set the oscilloscope INPUT (AC/DC) mode to "AC",
and adjust the 1LV502 (7.4M TUNE2) core to
minimize the carrier.
3. Perform steps 1 and 2 repeatedly to meet the specifica-
tions in 1 and 2.
4-28
1.24 ±0.02 V dc
GND
Minimum

4-6-9. INCOM2 Level Adjustment

Adjustment category: B
Measuring instruments: Oscilloscope, Audio generator
Extended board: TR-133B board
Preparation:
. Input 1 kHz/220 mV p-p sine wave signal from the audio
generator to the pin 2 (X) (GND: pin 3) of the INCOM2
connector (XLR pin 5) of CA-590/590P.
. Fig.1 (Refer to "4-1-4. Audio Connection".)
Measurement point:
TP502 (GND: E300)/TR-133B
board
Adjustment point: 1RV501 (INCOM 2 LEVEL)/
TR-133B board
A = 200 ± 10 mV p-p
Specification:
E1
G
F
TP202
RV801
RV201
E
TP801
E801
LV602
LV601
LV901 LV201
D
RV901 TP201
LV902
C
RV701
RV902
TP901
TP1
B
LV1 LV21
TP701
E701
A
S1
E101
1 2
TR-133B BOARD (A SIDE)
A
CN902
S2
S362
S363
S361
E400
E300
TP602 TP502 TP402 TP302
RV601 RV501 RV401 RV301
TP601 TP501 TP401 TP301
LV502 LV402 LV302
LV501 LV401 LV301
E100
TP21
TP41 TP61 TP81 TP101
E102
LV41 LV61 LV81 LV101
RV41 RV61 RV81 RV101
3 4
CCU-590/P/V1(E)