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UHF1 Troubleshooting Charts: Zone/Channel Select Error Troubleshooting Chart
6.2.12Zone/Channel Select Error Troubleshooting Chart
Channel
Select Error
Verify operation
of zone knob per
"Button Test"
flow chart
By studying the
adjacent chart against
the channel numbers
which have errors,
one signal may be
determined to be in
error or verify logic
levels at R513-R516
for each channel.
Signals
check good
at 800?
Verify voltage levels
directly at pin C1 of
the frequency switch
(S500). Position A =
2.2V, Position B = 0V,
Position C = 1.5V
checks
good?
contact with
circuit board
6816985H01-F
Probe Point
Verify codeplug
programming with
Yes
RSS. If codeplug
checks OK, then
replace U800.
No
S500
No
Yes
Verify
Channel
RTA3
RTA2
(R513)
(R514)
1
1
1
2
1
1
3
1
1
4
1
1
5
1
0
6
1
0
7
1
0
8
1
0
9
0
1
10
0
1
11
0
1
12
0
1
13
0
0
14
0
0
15
0
0
16
0
0
Replace
Switch
S500
MAEPF-27337-O
RTA1
RTA0
(R515)
(R516)
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
February 14, 2012
6.2-11
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