4-29
CCU-TX7 (E)/V1
4-7-4. INCOM Demodulation Adjustment
Note :
Perform this adjustment only when replacing
1
T401/
AA-90 board.
Equipment
:
Oscilloscope, Audio generator
To be extended :
AA-90 board
AFM-15 board (CA-TX7/TX7P)
Preparetions :
1. Input the 1 kHz sine wave signal of the audio generator
to pin 2 (GND : pin 1) of INTERCOM/PROGRAM
connector (5 pin) on the CA-TX7/TX7P.
.
Fig-1 (Refer to 4-1-5. Audio connection.)
2. Adjust the output level control of audio generator so that
the pin 24 (GND : pin 12) /AFM-15 board is 220 mV p-p.
Test point :
TP14 (GND : E2)/AA-90 board
Adjustment Procedures :
1. Set the input range of oscilloscope to DC made. Adjust
the white core of
1
T401/AA-90 board slowly so that the
DC level at TP14 (GND : E2)/AA-90 board is 1.24
±
0.01
V dc.
2. Set the input range of oscilloscope to AC mode, and adjust
the blue core of
1
T401/AA-90 board so that the sine wave
is minimum.
3. Repeat procedure 1.
1.24
±
0.01 V dc
GND
Minimum
4-7-5. INCOM Level Adjustment
Equipment
:
Oscilloscope, Audio generator
To be extended :
AA-90 board
FM-15 board (CA-TX7/TX7P)
Preparetion :
1. Input the 1 kHz sine wave signal of the audio generator
to pin 2 (GND : pin 1) of INTERCOM/PROGRAM
connector (5 pin) on the CA-TX7/TX7P.
.
Fig-1 (Refer to 4-1-5. Audio connection.)
2. Adjust the output level control of audio generator so that
the pin 24 (GND : pin 12) /AFM-15 board is 220 mV p-p.
Test point
:
TP15 (GND : E2)/AA-90 board
Adjustment point :
1
RV401 (INCOM LEVEL)/
AA-90 board
Specifications
:
A = 220
±
10 mV p-p
A
AA-90
PGM IN
MIC 1 LEVEL
MIC 2 LEVEL
MIC TEST
LEVEL IND
INTER COM
CLEAR
COM
( )
2W
RTS
4W
RTS
CLEAR
COM
OFF
CH-2
CH-1
0dB
–
20dB
0dB
–
20dB
0dB
–
20dB
S2081
PGM IN
TP10
TP13
TP9
TP15
TP12
S201
MIC-1-LEV
S301
MIC-2-LEV
S2004
MIC TEST
INCOM
LEV
RV401
RV101
RV81
PGM
DEV
INCOM
DEV
S2006
RTS 200
OHM
OFF
ON
S2003
INCOM MODE
2CH
1CH
RV41
RV301
MIC 2
LEV
RV201
MIC 1
LEV
INCOM SELECT
S2002
RTS/CLEAR-COM
S2005
RV2000
SIDE TONE
LV1 3.0M
H CONT
LV21
2.5M CCU DATA
TONE TUNE
LV101
5.6M TUNE
T201
T301
T401
LV41
3.6M
LV61
4.3M
AA-90 Board
(A SIDE)
TP46
TP3005
TP3002
TP3004
TP3003
TP3001
TP43
TP7
TP2
TP5
TP6
E2
TP14
TP11
TP8
TP3
TP1
TP44
E12
E1
E11
E10
E3001
