4-30
CCU-TX7 (E)/V1
4-7-7. MIC 1 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/TX7P rear panel
→
"CA-LINE"
2. Input the 1 kHz sine wave signal of the audio generator to
CH 1 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 19 (GND : pin 12) / AFM-15 board is 220 mV p-p.
4. S201 (0 dB/
_
20 dB)/AA-90 board
→
0 dB
Test point
:
TP10 (GND : E2)/AA-90 board
Adjustment point :
1
RV201 (MIC 1 LEVEL)/
AA-90 board
1100
±
50 mV p-p
4-7-6. MIC 1 Demodulation Adjustment
Note :
Perform this adjustment only when replacing
1
T201/
AA-90 board.
Equipment
:
Oscilloscope, Audio generator
To be extended :
AA-90 board
Preparations :
1. AUDIO SELECT switch (CAMERA/CA-MIC/CA-LINE)/
CA-TX7/TX7P rear panel
→
"CA-LINE"
2. Input the 1 kHz sine wave signal of the audio generator to
CH 1 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 19 (GND : pin 12)/AFM-15 board is 220 mV p-p.
Test point :
TP8 (GND : E2)/AA-90 board
Adjustment Procedures :
1. Adjust the white core of
1
T201/AA-90 board slowly so
that the DC level at TP8 (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
T201/AA-90 board so that the sine wave
is minimum.
3. Repeat procedure 1.
1.24
±
0.01 V dc
GND
Minimum
