6871620L01-C
May 28, 2008
Troubleshooting Charts:
DC Supply Failure
5-7
DC Supply Failure–Page 2
Check voltage at pin
1,2,3,6,7 & 8 of Q1302
Voltage =
SWB+
7.5V +/-
20% ?
No
Yes
Check voltage at
R1311
(FET_ENX)
Voltage =
GND?
Check voltage at
R1320
No
Replace Mainboard
Yes
Voltage =
SWB+?
No
Check L1307,
L1308, R1320,
R1321, C1342 &
C1343
Component
= OK?
Replace problem
components
No
Check voltage at
C1337
Yes
Replace Q1302
Voltage =
?
No
Replace Mainboard
Yes
2
1
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: ......