Motorola ASTRO XTS 5000 - Page 95

November 16, 2006 6881094C31-E
5-4 Troubleshooting Charts: Power-Up Failure
Power-Up Failure—Page 2
MAEPF-27390-A
Investigate
Clock Buffer
Components and
Isolate Problem
This signal may
contain harmonics
and, therefore, may
not appear as a
perfect sinewave.
Signal may
appear for a very
short period of
time (50ms). Use
an oscilloscope
with trigger to
capture signal.
Refer Board to
Service Depot for
Reflash, Patriot,
SRAM, and
FLASH Analysis
Investigate
16.8 MHz
Reference
Oscillator
Probe
16.8 MHz
Signal at R452
Signal
greater than
600mV?
Signal
greater than
600mV?
Check
16.8 MHz
Signal at
C452
Replace
U301
Replace
Problem
Component
Components
OK?
Fixed?
End
Fixed?
Replace
Y301
No
No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
1
2
Note: All components noted on this
chart are VOCON components.