Power-Up Failure - Motorola ASTRO XTS 5000 Detailed Service Manual

Troubleshooting Charts: Power-Up Failure
5.3 Power-Up Failure—Page 1
Isolate and
Repair Problem
See DC Supply
Failure flowchart
Replace U301
(Flipper) and
place R528
back on board
Signal may appear
for a very short period
of time (50 ms). Use
an oscilloscope with
trigger to capture signal.
6881094C31-D
Radio
Power-Up
Failure
Verify Standard
Bias in
Table 5-1
No Standard
Bias OK?
Yes
Remove
R528 (VOCON)
Yes
Fixed?
No
Place R528
back on board
Probe
32.768 kHz
Clock at R316
Signal No
Present?
Yes
Is
VOCON Board
No
NNTN4563, NNTN4819,
or NNTN4717
kit?
Yes
Remove
Shield
SH101
Verify integrity
of C308 and 2
C309
1
MAEPF-27389-C
5-3
July 21, 2004