Motorola APX 1000 Detailed Service Manual page 119

Troubleshooting Charts: DC Supply Failure
DC Supply 1.4 Volt Failure
Replace fuse
Verify L200, C202
and C203 is good.
No
Voltage
= 1.5V?
Yes
Verify UNSW_B+
No
at test point:
F_UNSW_B+
Yes
Verify Q6501
V_SW_1.4
No
Voltage
1.8V?
Yes
Voltage
1.8V?
Yes
No
Voltage
2.775V?
Yes
Check if U6302
draining high
current thru E6502
Check external
circuitry for U6507.
If good, change
U6507.
No
Refer troubleshooting
guide 5.4.5
5-21