May 28, 2008
6871620L01-C
5-20
Troubleshooting Charts:
VOCON RX Audio
VOCON RX Audio–Page 2
Signal
Present?
Check Audio PA output
signal at VR1201
pins 1 & 4 (differential)
No
No
Yes
Yes
1
Distortion
>3%?
Check DC level,
V at R1328.
If V=7.50 +/- 1V,
then replace U1304.
Otherwise, verify R1328.
Check connector J2.
If no problems were found
on connector J2, check
UCM-CE-Audiojack flex.
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: ......