Incom1 Demodulation Adjustment; Incom1 Level Adjustment - Sony CCU-590 Maintenance Manual

4-6-6. INCOM1 Demodulation Adjustment

Adjustment category: C
Note:
Perform this adjustment only
after replacing 1LV601 and/or
1LV602 on the TR-133B
board.
Measuring instruments: Oscilloscope, Audio generator
Extended board: TR-133B board
Preparation:
. Set the switches below on the MA-128B 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 INCOM1
connector (XLR pin 5) of CA-590/590P.
. Fig.1 (Refer to "4-1-4. Audio Connection".)
Measurement point:
TP601 (GND: E300)/TR-133B
board
Adjustment procedure:
1. Set the oscilloscope INPUT (AC/DC) mode to DC,
and connect the probe to TP601 (GND: E300) on the
TR-133B board. Then, turn slowly the 1LV601 (7.1M
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 1LV602 (7.1M TUNE2) core to
minimize the carrier.
3. Perform steps 1 and 2 repeatedly to meet the specifica-
tions in 1 and 2.
CCU-590/P/V1(E)
1.24 ±0.02 V dc
GND
Minimum

4-6-7. INCOM1 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 INCOM1
connector (XLR pin 5) of CA-590/590P.
. Fig.1 (Refer to "4-1-4. Audio Connection".)
Measurement point:
TP602 (GND: E300)/TR-133B
board
Adjustment point: 1RV601 (INCOM 1 LEVEL)/
TR-133B board
A = 200 ± 10 mV p-p
Specification:
E1
G
F
TP202
RV801
RV201
E
TP801
E801
LV901
LV201
RV901
D
TP201
LV902
C
RV701
RV902
TP901
TP1
B
E701
TP701
A
S1
E101
1 2
TR-133B BOARD (SIDE A)
A
CN902
S2
S363
E300
TP602 TP402 TP302
RV601
RV401 RV301
TP601 TP401 TP301
LV402
LV602
LV302
LV601 LV401 LV301
E100
TP21
TP41 TP101
E102
LV101
RV41 RV101
3 4
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