Motorola ASTRO XTS 5000 Detailed Service Manual page 91

Troubleshooting Charts: Display Failure (NTN9564)
Display Failure (NTN9564)—Page 3
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.
6881094C31-D
3
Check Active
Low Status on
both RESET
and CS
Low-
No
Level Pulses
service depot for
Present?
Yes
Check D0-D7
for appropriate
voltage levels
Signal
No
present
at appropriate
level?
Yes
Replace
Display
Return radio to
further analysis
MAEPF-27406-O
July 21, 2004
5-13