User's Manual

6881094C31-C October 14, 2003
Troubleshooting Charts: Channel/Zone Select Error 5-15
5.8 Channel/Zone Select Error
MAEPF-27402-O
Replace Front
Cover Housing
Assembly
Repair flex or
connections as
needed
U1
checks
good?
Verify operation
of zone 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
No
Ye s
Ye s
Verify similar
operation directly
at U1 on controls
flex assembly
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