DP480 Service Manual
32
2
Communication fails
A. Make sure the channels the both radios communicate on are of
the same frequency.
B. The radios use different CTCSS/DCS signaling codes. Set the
same one via PC.
C. Out of communication range.
3
Cannot receive
signals
A. The antenna has bad contact. Screw up the antenna connector.
B. Sensitivity is low. Fine tune the “debugging mode”.
C. The squelch level is too high, so that squelch cannot be enabled.
Set a lower level via PC.
D. The Q3 does not work well. Replace the 2SC3356.
4
Red light on during
transmitting,
but receiver hears
no voice
A. The tube power amplifier outputs no power. Replace with a new
amplifier.
B. The microphone does not work well. Replace with a new
microphone.
5
Green light on
during receiving,
but cannot hear
voice
A. The speaker does not work well. Replace with a new speaker.
B. The audio amplifier IC5 does not work well. Replace with a new
TDA8547.
6
Programming fails
Check wiring.
7
Low voice
Check the settings of volume and MIC gain via the PC Tool.
Appendix 1 Abbreviations
AMP
Amplify, amplifier
ANT
Antenna
APC
Automatic power control
BPF
Band-pass filter
CTCSS
Continuous tone control squelch system
DCS
Digital code squelch
DEMOD Demodulation
E2PROM Electrically Erasable Programmable Read-Only Memory
HPF
High-pass filter
IDC
Instantaneous deviation control
Содержание DP480
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Страница 76: ...DP480 Service Manual 73 Top Layer Layout Drawing of Main Board ...
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Страница 80: ...DP480 Service Manual 77 Bottom Layer Layout Drawing of Key PCB ...
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