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CCU-590/P/V1(E)
4-28
A
1.24
±
0.02 V dc
GND
Minimum
4-6-8. INCOM2 Demodulation Adjustment
Adjustment category:
C
Note:
Perform this adjustment only
after replacing
1
LV501 and/or
1
LV502 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
1
LV501 (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
1
LV502 (7.4M TUNE2) core to
minimize the carrier.
3.
Perform steps 1 and 2 repeatedly to meet the specifica-
tions in 1 and 2.
4-6-9. 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:
1
RV501 (INCOM 2 LEVEL)/
TR-133B board
Specification:
A = 200
±
10 mV p-p
CN902
TP1
TP101
TP201
TP202
TP21
TP301
TP302
TP401
TP402
TP41
TP501
TP502
TP601
TP602
TP61
TP701
TP801
TP81
TP901
E1
E100
E101
E102
E300
E400
E701
E801
S1
S2
S361
S362
S363
RV101
RV201
RV301
RV401
RV41
RV501
RV601
RV61
RV701
RV801
RV81
RV901
RV902
A
B
C
D
E
F
G
1
2
3
4
TR-133B BOARD (A SIDE)
LV1
LV101
LV201
LV21
LV301
LV302
LV401
LV402
LV41
LV501
LV502
LV601
LV602
LV61 LV81
LV901
LV902