Motorola ASTRO XTS 5000 Detailed Service Manual page 97

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