10-24
Chart 22. Top/Side Button Error
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 controls flex circuit.
2) Bad connection.
3) Defective switch.
4) Defective A/D port in host
C.
Use RSS to
enable button.
Top/Side Button
Error
Using RSS, verify
problem button is
enabled for function.
Button
enabled?
Yes
No
Using a voltmeter,
measure the voltage at
PE3 of U701(pin 27) while
depressing the following
button:
Button Nom. VDC
Top 0.00
Top Side 2.38
Side 1 3.06
Side 2 3.77
Levels
correct?
Replace U701.
Verify connections
and control top/PTT
flex circuit
consisting of
R1, R2, and R3
and repair as
necessary.
No
Yes
Verify
operation of buttons
SB1, SB2, SB3,
and SW3.
Buttons OK?
Replace
front cover (housing)
assembly.
No
Yes
MAEPF-26036-O
Verify operation of
buttons per "Button
Check" flow chart C.18.
Buttons
check good?
Yes
No
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