Troubleshooting Flow Chart For Controller - Motorola M11URD6CB1_N Service Manual

Troubleshooting
Troubleshooting Charts
Are alert tones
No/Don't
know enabled with RSS?
Use RSS to enable tones.
Yes
Are alert tones
enabled with RSS?
No
Check radio con-
nection to RIB and
computer.
RIB/radio
No
connections OK?
Yes
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 U101.
2) Check for 14.7456 MHz at pin 73 of U101.
3) Check DC at pin 75 of U101. If < 4.5V DC check
C202 for 2.1 MHz signal.
4) Check for typical voltages of U101 and U201.
Troubleshooting Flow Chart
for Controller
9-8
Start
Apply power to radio and
turn on.
No
Was good or bad power-on
beep present?
Yes
Was good power-on beep
present?
End
6880905Z99-O
GTX LTR/Privacy Plus 800 MHz Mobile Service Manual
Yes
No
Yes
No
Main radio board must be
replaced.
Done
No
Are tones present
on power up at
U202, pin 8?
Yes
Audio problem. Trouble-
shoot audio circuitry.
Reprogram radio with
RSS. Apply power to
radio and turn on.
Was good power-
on beep present?
Yes
Done
Done
June, 2000