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FP460 Service Manual
Page 36 of 53
range.
4 No
signal
A. The antenna is in poor contact. Please fasten it.
B. The HF amplifying tube Q509 is broken. Please
change it.
C. The squelch level is too high, so the squelch
cannot be opened. Please adjust the squelch level.
5 The
indicator
lights red while
transmitting, but
no voice is heard
by the recipient.
A. The power amplifying tube is broken, so there is no
power output. Please change it.
B. The MIC is broken. Please change it.
C. The operational amplifier U600 is broken. Please
change it.
6 The
indicator
lights green while
receiving, but no
sound is heard.
A. The speaker is broken. Please change it.
B. The audio power amplifier U600 is broken. Please
change it.
C. The switch diode Q601 is broken. Please change
it.
7 The
programming
is abnormal
A. The programming cable is not correctly connected
to PC. Please check the cable connection.
B. The Computer’s RS-232 serial port output is
abnormal. Please check the computer.
C. The earphone jack of the radio is in poor contact.
Please check the earphone jack. If it is abnormal,
please change it.
Appendix1 Abbreviation
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
HPF high pass filter
Содержание FP460
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Страница 52: ...FP460 Service Manual Page 51 of 53 Figure2 FP460 Top Board Position Mark Diagram ...
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