Motorola ASTRO Digital Spectra, Instruction Manual

Page: 82 / 114

60 6881086C22-B
AIB RX Audio Troubleshooting Chart
Yes Yes Yes Yes
9.6V
±
5%
present between
R104 and C105?
No
9.6V
±
5%
present at
U102-4?
Yes
Yes
Yes
Yes
Yes
Filtered
Audio?
No
2.2V
present at
U102-5, 10?
No
1kHz
at J3-1 and
J3-6?
1kHz
at J3-46
Remove cables
from accessory
connectors
Ensure
S101-SW7
is on
Yes
No
1kHz
present at
J1-17, 36, 49?
Radio cable
continuity
ok?
Replace
cable
No
No
No
Check/Replace
jumper J15
Is
busy light
on?
Consult
appropriate radio
service manual
No
Digital
deskset
present?
WARNING:
SPKR_LO must not be
grounded or damage
to the radio may result
Determine
receiver audio
routine source
Detect
Audio
Speaker
audio?
No
Yes
Yes
Yes
Is jumper
placed for active
high or active
low?
Active
low
Is
Jumper J15
placed
appropriately?
No
Speaker
UnMute?
No
Set up standard
receive test
configuration
(see notes)
Verify accessory
cabling continuity
and consult appropriate
component manual
Repair or
replace board
as necessary
NOTES:
1. Standard receive 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
1
2
Yes
2
Yes
No
Continuity
between J1-22,
47 and J3-4
ok?
Continuity
between J1-24,
49 and J3-2
ok?
Continuity
between J1-11,
36 and J3-32,
7 ok?
Continuity
between J1-22,
47 and J4-2
ok?
Continuity
between J1-24,
49 and J4-1
ok?
No
No No
Yes
2
2 2
2
1
No
No
No
2
2
2
Yes
1
Yes
1
MAEPF-26318-A
AIB RX AUDIO
START
Active
high
Does
TP17 go from
0V to 5V when
receiving?
No
Yes
Check/Replace
U107
Check/Replace
Q101 and/or Q102
Check/Replace
jumper J15
Place the jumper for
either active high or
active low operation
No
Does TP16
voltage go from
5V to 0V when
receiving?
Yes
No
Does
TP25 go from
0V to 8V when
receiving?
Yes