Motorola ASTRO SPECTRA - AIB Board Issues

6881086C22-B 59
AIB TX Audio Troubleshooting Chart
Yes
Yes
Yes
Yes
9.6V ±5%
present between
R104 and
C105?
No
9.6V ±5%
present at
U101-4?
No
4.8V
present at
U101-3, 5, 10?
No
1kHz
90mVrms at
U101-8?
Inject 1kHz tone
onto appropriate
transmit source path
Yes
No
No
No
Carrier
at RX/TX
connector?
Yes
Radio cable
continuity ok?
Replace
radio
cable
J1-1
0V?
Set up standard
transmit test
configuration
(see notes)
Remove all
external
accessories
Consult
appropriate radio
service manual
Verify accessory
cabling continuity
and consult appropriate
component manual
Repair or
replace board
as necessary
Short J3-19 to
digital ground
Yes
No
NOTES:
1. Standard transmit receive signal is 1kHz
at 60% FSD on appropriate carrier.
2. Be sure all jumpers and switches are
appropriately set for application (see schematic).
2
2
1
2
2
2
2
Yes
Is
1kHz signal
present at
J3-46?
No
2
1
MAEPF-26317-A
AIB TX AUDIO
START