Volume Set Error - Motorola ASTRO XTS 5000 Detailed Service Manual

Troubleshooting Charts: Volume Set Error

6.12 Volume Set Error

Refer to
VOCON RX
Audio flowchart
68P81094C31-O
Volume
Set Error
Verify operation
of volume knob
using Button Test
flowchart
Yes
Volume
check OK?
No
Using a voltmeter,
measure voltage at
U507 pin 1, when volume
knob is all the way on.
The value should be 3.0V
Replace Front
Cover 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
Voltage
Functional?
No
Replace
U507
Measure voltage from
R526 to GND while
moving volume knob
from min to max. Max
volume is 2.50V
Volume
No
pot OK?
Yes
Verify connections
and control top/PTT
flex connections
Synopsis
Yes
Replace
U501
MAEPF-27401-O
April 15, 2002
6-11