User's Manual

6881094C31-C October 14, 2003
Troubleshooting Charts: Power-Up Failure 5-3
5.3 Power-Up Failure—Page 1
MAEPF-27389-C
Radio
Power-Up
Failure
Remove
R528 (VOCON)
Replace U301
(Flipper) and
place R528
back on board
Fixed?
Place R528
back on board
Probe
32.768 kHz
Clock at R316
Signal
Present?
Is
VOCON Board
NNTN4563, NNTN4819,
or NNTN4717
kit?
Signal may appear
for a very short period
of time (50 ms). Use
an oscilloscope with
trigger to capture signal.
Verify integrity
of C308 and
C309
Remove
Shield
SH101
Verify Standard
Bias in
Table 5-1
Standard
Bias OK?
Isolate and
Repair Problem
See DC Supply
Failure flowchart
No
No
No
No
Ye s
Ye s
Ye s
Ye s
1
2