Troubleshooting
8-7
Troubleshooting Flow Chart
for Controller
Start
Apply power to radio and
Was good or bad power-on
Yes
End
Was good power-on beep
Are alert tones
enabled with RSS?
Use RSS to enable tones.
Was good power-
on beep present?
Main radio board must be
replaced.
Are tones present
on power up at
U0202, pin 8
Audio problem. Trouble-
shoot audio circuitry.
With power connected to radio and the radio turned
on, check the following:
1) 5 V at pin 1 of U631 and pin 71,12,31,41 of U0101.
2) Check for 14.7456 MHz at pin 73 of U0101.
3) Check DC at pin 75 of U0101. If < 4.5V DC check
TP0200 for 2.1 MHz signal.
4) Check for typical voltages of U0101 and U0201.
beep present?
turn on.
present?
Done
Done
Done
Yes
Yes
Yes
Yes
No/Don’t
know
No
No
No
Are alert tones
enabled with RSS?
RIB/radio
connections OK?
Yes
No
No
Yes
(RX AUDIO)?
Reprogram radio with
RSS. Apply power to
radio and turn on.
Check radio con-
nection to RIB and
computer.
