Motorola SSETM 5000 - Manual (Page 122)

November 11, 2004 6881094C12-A
9-18 Troubleshooting Charts: VOCON RX Audio
9.12 VOCON RX Audio—Page 1
MAEPF-27394-B
Probe R406 for
Frame Sync Signal,
Compare with
RX SAP waveform,
Trace 1
Frame
Sync
Present?
Replace U401
and reflash
Probe R403 for
Data, Compare
with RX SAP
waveform, Trace 2
Signal
Present?
THD <3%?
Clock
Present?
Probe R405
for Clock Signal,
Compare with
RX SAP
waveform, Trace 3
Go to
RX RF
flowchart
Data
Present?
Check
Distortion of
Signal at C533
Replace U501
(GCAP II)
Check Preamp
Input Signal at
C533
No No
No
No
No
Yes
Yes
Yes
Yes
1
Yes
Bad SINAD
Bad 20db Quieting
No Recovered Audio
Inject Standard
Input into Antenna
Connector
A standard input is an
RF signal with a 1 kHz
tone modulated with 3 kHz
deviation in a 25 kHz channel.