Motorola ASTRO XTS 5000 - Page 106

6881094C31-E November 16, 2006
Troubleshooting Charts: Display Failure (NNTN4563, NNTN4819, NNTN4717 & NNTN5567 VOCON Kits) 5-15
Display Failure (NNTN4563, NNTN4819, NNTN4717 & NNTN5567 VOCON
Kits)
Page 3
MAEPF-27507-A
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 (0-V2) occurrence during
power-on initialization period.
No
Ye s
No
Ye s
3
Signal
present
at appropriate
level?
Replace
Display
Check J301, pins
15 and 16 for
appropriate voltage
levels (0-V2)
Return radio to
service depot for
further analysis