Channel Select Error - Motorola APX 5000 Service Manual

Troubleshooting Charts: Channel Select Error
5.8

Channel Select Error

Physical RTA3
Position (R2130)
Channel 1 1
Channel 2 1
Channel 3 1
Channel 4 1
Channel 5 1
Channel 6 1
Channel 7 1
Channel 8 1
Channel 9 0
Channel 10 0
Channel 11 0
Channel 12 0
Channel 13 0
Channel 14 0
Channel 15 0
Channel 16 0
RTA2 RTA1 RTA0
(R2129) (R2128) (R2127)
0 1 0
0 1 1
1 1 1
1 1 0
1 0 0
1 0 1
0 0 1
0 0 0
0 0 0
0 1 0
0 1 1
1 1 1
1 1 0
1 0 0
1 0 1
0 0 1
CHANNEL
SELECT ERROR
Verify operation of
Channel Select
switch by using
"Button Test"
flowchart
Pass Button
Test?
No
Disconnect the control top flex from
the controller board. Visually
inspect the control top flex for tears
or other damage. For each
channel in error, use the chart to
compare the continuity to ground
for each pin.
Pass visual
inspection and
continuity check?
Yes
Reconnect the control top to
the controller and power on
the radio. Verify the logic
levels at R2130, R2129,
R2128, R2127 with chart.
Logic Good?
Yes
Verify board to flex
connection.
Yes
Verify code plug
programming
No
Replace Control
Top
No
Replace controller
board
5-25