Motorola ASTRO Digital Saber Service Manual page 96

Zone/Channel Select
Error.
Verify operation of
zone knob per "Button
Check" flow chart C.20.
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
U206 for each
channel..
Verify codeplug
programming
Signals
Yes
with RSS. If
check good
codeplug checks
at U206?
good replace
U206.
No
Verify similar
operation directly at
S902.
No
S902 checks
Replace S902.
good?
Yes
Repair flex or
connections as needed.
MAEPF-24402-A
Chart 23 . Zone/Channel Select Error
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 RTA0
1 0 0 0 0
2 0 0 0 1
3 0 0 1 0
4 1 1
0 0
5 0 0
0 1
6 0 1 0 1
7 0 1 1 0
8 0 1 1 1
9 1 0 0 0
10 0 1
1 0
1 0
11 1 0
12 1 0 1 1
13 1 1 0 0
14 1 1 0 1
15 1 1 1 0
16 1 1
1 1
Top/Side Button
Error
Verify operation of
buttons per "Button
Check" flow chart C.20.
Using RSS, verify Yes Buttons
problem button is check good?
enabled for function.
No
Using a voltmeter,
measure the voltage at
PE3 of U204 while
Yes
Button depressing the following
enabled? button:
Button Nom. VDC
Top 0.00
Top Side 2.38
No
Side 1 3.06
Side 2 3.77
Use RSS to
enable button.
Levels
Yes
Replace U204.
correct?
Replace frame
assembly.
Chart 24 . Top/Side Button Error
10-14
Synopsis
This chart relates to a failure
in reading the buttons: Top, Top
Side, Side Button 1, or Side
Button 2. Basic Failure modes
are as follows:
1) Failure in flex circuit
consisting of R902, R903,
R904, R201.
2) Bad connection.
3) Defective switch.
4) Defective A/D port in host
µC.
Verify
No
operation of buttons
S903, S905, S906,
and S907.
No
Buttons OK?
Yes
Verify connections
and control top/PTT
flex circuit
consisting of
R902, R903 ,R904,
R201 and repair as
necessary.
MAEPF-24400-A