Motorola ASTRO XTS 5000 - Page 97

November 16, 2006 6881094C31-E
5-6 Troubleshooting Charts: Power-Up Failure
Power-Up Failure (for kit NNTN5567)—Page 2
1
Probe
16.8 MHz
Signal at R459
Signal may
appear for a very
short period of
time (50ms). Use
an oscilloscope
with trigger to
capture signal.
Note: All components noted on this
chart are VOCON components.
Investigate
16.8 Mhz
Reference
Oscillator
No
No
Signal
greater than
600mV?
Yes
Yes
No
No
Yes
Yes
Check
16.8 MHz
Signal at
C450
Signal
greater than
600mV?
The signal may
contain harmonics
and, therefore, may
not appear as a
perfect sineware.
Investigate
Clock Buffer
Components and
Isolate Problem
Refer Board to
Service Depot for
Reflash, Patriot,
SRAM, and
FLASH Analysis
2
Components
Ok?
Replace
Problem
Component
Fixed?
Replace
Y502
No
Yes
Fixed?
Replace
U501
End