Motorola APX 2000 - Channel Select Error (APX 2000; APX 4000 (Two Knobs))

Troubleshooting Charts: Channel Select Error (APX 2000/ APX 4000 (Two Knobs)) 5-25
5.8 Channel Select Error (APX 2000/ APX 4000 (Two Knobs))
Physical
Posion
RTA3
(R21007)
RTA2
(R21006)
RTA1
(R21005)
RTA0
(R21004)
Channel 1 1 0 1 0
Channel 2 1 0 1 1
Channel 3 1 1 1 1
Channel 4 1 1 1 0
Channel 5 1 1 0 0
Channel 6 1 1 0 1
Channel 7 1 0 0 1
Channel 8 1 0 0 0
Channel 9 0 0 0 0
Channel 10 0 0 1 0
Channel 11 0 0 1 1
Channel 12 0 1 1 1
Channel 13 0 1 1 0
Channel 14 0 1 0 0
Channel 15 0 1 0 1
Channel 16 0 0 0 1
Channel Select
Error
Disconnect the GCAI flex
from the front kit flex.
Visually inspect the GCAI
flex for tears or other
damage. For each channel
in error, use the chart to
compare the connuity to
ground for each pin.
Verify operaon of
Channel Select Switch
by using Buon Test
flowchart
Reconnect the GCAI flex to
frontkit flex and power on the
radio. Verify the logic levels at
R21007, R21006, R21005 and
R21004 with chart.
Pass Buon
Test?
Verify code plug
programming
Pass visual
inspecon and
connuity check?
Replace GCAI
flex
Logic Good?
Verify board to flex
connecon.
Replace RF
Board
Yes
No
No
No
Yes
Yes