Chart 21. Zone/Channel Select Error - Motorola ASTRO XTS 3000 Service Manual

Verify codeplug
programming
Yes
with RSS. If
codeplug checks
good replace
U702.
U1 of controls flex assembly.
Replace
No
front cover (housing)
assembly.
Zone/Channel Select
Error.
Verify operation of
zone knob per "Button
Check" flow chart C.18.
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 PH3-PH0 at
U702 for each
channel.
Signals
check good
at U702?
No
Verify similar
operation directly at
U1 checks
good?
Yes
Repair flex or
connections as needed.
MAEPF-26035-O
Synopsis
This chart relates to a failure
in reading the zone/channel
select knob. Basic Failure
modes are as follows:
1) Failure in flex circuit.
2) Bad connection.
3) Defective switch.
4) Defective port in SLIC.
Channel RTA3 RTA2 RTA1
1 0 0
2
0 0
3
0 0
4 0 0
5 0 1
6
0 1
7
0 1
8
0 1
9 1 0
10 1 0
11 1 0
12
1 0
13 1 1
14 1 1
15 1 1
16
1 1

Chart 21. Zone/Channel select Error

RTA0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
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