November 16, 2006 6881094C31-E
5-18 Troubleshooting Charts: Display Failure (NTN9564)
Display Failure (NTN9564)—Page 3
MAEPF-27406-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
Ye s
No
Ye s
3
Signal
present
at appropriate
level?
Replace
Display
Check D0-D7
for appropriate
voltage levels
Return radio to
service depot for
further analysis
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