Motorola SSETM 5000 - Manual (Page 115)

6881094C12-A November 11, 2004
Troubleshooting Charts: Volume Set Error 9-11
9.6 Volume Set Error
MAEPF-27401-B
No
No
No
Yes
Yes
Yes
Volume
Set Error
Using a voltmeter,
measure voltage at
U507 pin 1, when volume
knob is all the way on.
The value should be V2*
Voltage
Functional?
Replace
U501
Verify connections
and control top/PTT
flex connections
Volume
check OK?
Refer to
VOCON RX
Audio flowchart
Verify operation
of volume knob
using Button Test
flowchart
Replace
U507
Volume
pot OK?
Replace
Housing
Assembly
This chart relates to a failure in the volume
set knob. Basic failure modes are as follows:
1) Failure in control top/PTT flex circuit
2) Bad connection
3) Defective volume control potentiometer
4) Defective A/D port in GCAP II
5) Problem in receive audio circuit
Synopsis
Measure voltage from
R526 to GND while
moving volume knob
from min to max. Max
volume is 2.50V
* per Standard Bias Table