May 28, 2008
6871620L01-C
5-8
Troubleshooting Charts:
DC Supply Failure
DC Supply Failure–Page 3
Check voltage at
R1319
Voltage =
3.8 Vdc +/-
5%?
Check L1306 &
C1333
Component
OK?
No
Yes
No
Replace problem
components
Check R1318
Yes
Component
OK?
Check voltage
,
at L1304
Voltage =
1.875 Vdc
+/- 5%?
Check L1304,
C1330 & C1331
Component
OK?
No
Yes
Replace problem
components
No
Check voltage at
L1303
Yes
Yes
No
ReFLASH HOST
C Code
Fixed ?
END
Replace Mainboard
No
Voltage =
1.55 Vdc
+/- 5%?
Check L1303,
C1328 & C1329
Component
OK?
2
3
Replace problem
components
No
Yes
3
Check voltage, V2
at L1302
Yes
No
Yes
Voltage =
2.9 Vdc +/-
5%?
Check L1302,
C1324 & C1325
Component
OK?
Replace problem
components
No
Yes
3
Check voltage at
L1301
Voltage =
5.0 Vdc +/ -
5%?
Check L1301,
C1318, C1319 &
VR1206
Component
OK?
Replace problem
components
No
YES
3
4
Yes
No
No
Yes
3
Replace problem
components
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: ......