6871620L01-C
May 28, 2008
Troubleshooting Charts:
DC Supply Failure
5-9
DC Supply Failure–Page 4
4
Check voltage at
C14
Voltage =
5.0 Vdc +/ -
5%?
Check Q4,
E5, D1,
C10, C11, C12,
C14, Q1301 &
R1709
Component
OK?
Replace problem
components
No
Yes
No
Yes
Replace U1
Check voltage at
C27
Voltage =
3.0 Vdc +/ -
5%?
Check L10, D3,
C25, C26, C27,
C28 & C30
Component
OK?
Replace problem
components
No
Yes
No
Yes
Replace U3
Check voltage at
C17
Voltage =
3.0 Vdc +/ -
5%?
Check D2, C15,
C16, C17 & C9
Component
OK?
Replace problem
components
No
Yes
No
Yes
Replace U2
END
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: ......