Sony CCU-TX7 Service Manual page 75

4-7-8. MIC 2 Demodulation Adjustment
Note : Perform this adjustment only when replacing @T301/
AA-90 board.
Equipment : Oscilloscope, Audio generator
To be extended : AA-90 board
AFM-15 board (CA-TX7/TX7P)
Preparations :
1. AUDIO SELECT switch (CAMERA/CA-MIC/CA-LINE)/
CA-TX7/TX7P — "CA-LINE"
2. Input the 1 kHz sine wave signal of the audio generator to
CH 2 of MIC IN (rear panel) on the CA-TX7/TX7P.
¢ Fig-2 (Refer to 4-1-5. Audio connection.)
3. Adjust the output level control of audio generator so that
the pin 17 (GND: pin 12)/AFM-15 board is 220 mV p-p.
Test point : TP11 (GND : E2)/AA-90 board
Adjustment Procedures :
1. Adjust the white core of @T301/AA-90 board slowly so
that the DC level at TP11 (GND : E2) /AA-90 board is
1.24 +0.01 V de.
1.24 + 0.01 Vde
GND
2. Set the input range of oscilloscope to AC mode, and adjust
the blue core of @T301/AA-90 board so that the sine wave
is minimum.
Minimum
3. Repeat procedure 1.
CCU-TX7 (E)\/V1
4-7-9. MIC 2 Level Adjustment
Equipment : Oscilloscope, Audio generator
To be extended : AA-90 board
AFM-15 board (CA-TX7/TX7P)
Preparations :
1. AUDIO SELECT switch (CAMERA/CA-MIC/CA-LINE)/
CA-TX7/TX-7P — "CA-LINE"
2. Input the 1 kHz sine wave signal of audio generator to
CH 2 of MIC IN (rear panel) on the CA-TX7/TX7P.
¢ Fig-2 (Refer to 4-1-5. Audio connection.)
3. Adjust the output level control of audio generator so that
the pin 17 (GND: pin 12)/AFM-15 board is 220 mV p-p.
4. S301 (0 dB/—20 dB)/AA-90 board — "0 dB"
Test point : TP13 (GND : E2)/AA-90 board
Adjustment point : @RV301 (MIC 2 LEVEL)
. AA-90 board
Specifications :A=1100+50mVp-p
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AA-90 Board (A SIDE)
4-31