6871620L01-C
May 28, 2008
Troubleshooting Charts:
Volume Set Error
5-13
5.6
Volume Set Error
Volume
Set Error
Verify operation
of volume
Buttom Test
flow chart
Volume
button OK?
Refer to “No
Receive Audio”
flow chart
Yes
No
Yes
No
Yes
No
Using a voltmeter,
measure voltage at
C1106. The value
should be V2
Voltage
Functional?
Replace
Mainboard
Replace Mainboard
to Top and Side
Control Flex J(3)
Volume
pot OK?
Replace
Volume control
button flex
Verify contact
with circuit
board
Any Digital data
or activity?
Synopsis
This chart relates to failure in the volume
button. Basic failure modes are as follows:
1) Bad connection
2) Defective volume control button
3) Detective MAKO IC U1304
4) Problem in receive audio circuit
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......