7 - 2
7.2
Standard Signal Level and Adjustment
a)
CONTROL (CDE-885)
Item
Turning
control
Check
terminal
Value
Measurement
equipment
Remarks
Mic gain
RV5
IC41 1pin
0.7Vp-p
Oscilloscope
With 1kHz 3mVp-p signal at mic terminal
Remote
audio
signal input level
RV3
IC41 1pin
0.7Vp-p
Oscilloscope
With 1kHz -10dBm signal at
Remote AF input
RX AF input level
RV4
IC38 1pin
0.7Vp-p
Oscilloscope
With 40uVemf RF signal (modulation: 1kHz
signal, 3.0kHz deviation)
External AF signal
output level
RV7
External AF
output
terminal
-10dBm
Level meter
With 40uVemf RF signal (modulation: 1kHz
signal, 3.0kHz deviation)
Record output level
RV3
Record
terminal
-10dBm
Level meter
With 40uVemf RF signal (modulation: 1kHz
signal, 3.0kHz deviation)
b)
RX CIRCUIT (CMA-705)
This printed circuit board has some adjustment points. However, these adjustment points require the special measurement
equipment for adjusting without following point.
Item
Tuning
control
Check
terminal
Value
Measurement
equipment
Remarks
Receiving level
VR2
IC1 7pin
4.75V
Multi meter
With 70uVemf RF signal(no modulation)
c)
7
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