Motorola ASTRO XTS 5000 Detailed Service Manual page 50

5-10 Troubleshooting Charts: Display Failure (NNTN4563, NNTN4819, & NNTN4717 VOCON Kits)
Display Failure (NNTN4563, NNTN4819, & NNTN4717 VOCON Kits)
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 (0-V2) occurrence during
power-on initialization period.
October 14, 2003
3
Check Active
Low Status on
both RESET
and CS
Low-
No
Level Pulses
Present?
Yes
Check J301, pins
15 and 16 for
appropriate voltage
levels (0-V2)
Signal
No
present
at appropriate
level?
Yes
Replace
Display
Return radio to
service depot for
further analysis
MAEPF-27507-A
6881094C31-C