Top/Side Button Error Troubleshooting Chart - Motorola XTS 2500 Service Manual

6.3-12

6.3.13Top/Side Button Error Troubleshooting Chart

Using RSS,
verify problem
button is enabled
for function
Yes
Buttons
Enabled?
No
Use RSS
to enable
button
Replace
U701
February 14, 2012
UHF2 Troubleshooting Charts: Top/Side Button Error Troubleshooting Chart
Top/Side
Button Test
Verify operation
of zone knob per
"Button Test"
flow chart
Button
Yes
check OK?
No
Using a voltmeter, measure the voltages
at the resistor while depressing the
following keys:
Button
Voltage
Emergency
2.50V to 0V
Top Side
2.70V to 0V
Middle Side
2.70V to 0V
Bottom Side
3.00V to 0V
Levels
Yes
correct?
Replace
buttons and/or
switch
Synopsis
This chart relates to a failure in
reading the buttons. Side Button 1,
Side Button 2, or Side Button 3.
Basic failure modes are as follows:
1) Bad connection
2) Defective Switch
3) Defective MAKO IC (U701)
Resistor
R511
R510
R509
R508
Verify physical
No
operation of
buttons
No
Buttons
OK?
Yes
Verify contact
with circuit
board
MAEPF-27338-O
6816985H01-F