Sony CCU-TX7 Service Manual page 73

4-7-4. INCOM Demodulation Adjustment
Note : Perform this adjustment only when replacing @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 @T401/AA-90 board slowly so that the
DC level at TP14 (GND : E2)/AA-90 board is 1.24 £0.01
V de.
2. Set the input range of oscilloscope to AC mode, and adjust
the blue core of @T401/AA-90 board so that the sine wave
is minimum.
3. Repeat procedure 1.
CCU-TX7 (E)V1
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 : @RV401 (INCOM LEVEL)/
AA-90 board
:A=220+10 mV p-p Specifications
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