Motorola ASTRO XTSTM 4000 Detailed Service Manual page 70

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