Top/Side Button Test - Motorola ASTRO XTSTM 4000 Detailed Service Manual

Troubleshooting Charts: Top/Side Button Test
5.8

Top/Side Button Test

No
Replace
U1304
6871620L01-C
Using RSS, verify
Yes
problem button is
enabled for
function
Using a voltmeter, measure the
voltage at U1305 pin 3 while
Yes
Buttons
depressing the following buttons:
enabled? Emergency, Side Button 1,
Side Button 2, and Side Button 3.
The probe points are as follows:
No
Emergency Button
Clear/Secure Button
Programmable Button
No Button Pressed
Use RSS
to enable
button
Yes
Replace U1305
Problem Yes
End
Fixed?
Top/Side Button
Test
This chart relates ro a failure in
reading the buttons: Emergency,
Side Button 1, Side Button 2, or
SIde Button 3.
Verify operation
of zone knob
Basic failure modes are as follows:
using Button Test
1) Failure in controls flex circuit
flowchart
2) Bad connection
3) Defective Switch
4) Defective A/D port in GCAP II
Button check
OK?
No
0.03V
1.40V
2.20V
2.85V
Verify physical
Levels
No
operation of
Correct?
buttons
Buttons
Verify connections
and Control Top/ PTT
flex circuit and repair
as necessary
Synopsis
No
Replace Radio
OK?
Chassis Assembly
Yes
May 28, 2008
5-15