6816985H01-F February 14, 2012
700/800 MHz Troubleshooting Charts: No Display Troubleshooting Chart (3 of 3) 6.4-15
6.4.16No Display Troubleshooting Chart (3 of 3)
MAEPF-27341-O
Low-
Level Pulses
Present?
Check Active
Low Status on
both RESET
and CS
Use an Oscilloscope to check for
a low level (0V) pulse occurrence
during power-on initialization period.
Use an Oscilloscope to check for
either a low level (0V) pulse or
high-level (1.85V) occurrence during
power-on initialization period.
No
No
Yes
Yes
3
Signal
present
at appropriate
level?
Repair
appropriate
connections
Check D0-D7
for appropriate
voltage levels
Return radio to
service depot for
further analysis
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