Motorola SSETM 5000 - Manual (Page 116)

November 11, 2004 6881094C12-A
9-12 Troubleshooting Charts: Channel Select Error
9.7 Channel Select Error
MAEPF-27402-A
Replace
Housing
Assembly
Verify operation
of channel knob
using Button Test
flowchart
Signals
check good at U1
on the controls
flex assy.?
Verify codeplug
programming with
RSS. If codeplug
checks OK, then
replace U1.
By studying the
adjacent table against
the channel numbers
that have errors, one
signal may be determined
to be in error. Verify
logic levels at R235,
R236, R239, and R241
for each channel.
Channel
Select Error
No
Yes
RTA3
(R241)
RTA2
(R239)
RTA1
(R236)
RTA0
(R235)
Channel
Probe Point
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0 1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0 1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0 1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16