Aib Tx Audio Troubleshooting Chart - Motorola ASTRO Spectra Instruction Manual

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

AIB TX Audio Troubleshooting Chart

59