Motorola APX 3000

5-16 Troubleshooting Charts: DC Supply Failure
5.4.2 DC Supply 3.6 Volt Failure
V_SW_5
Is fuse intact
(not blown)?
Replace Fuse
Verify UNSW_B+ at
test point: F_UNSW_B+
Verify L200, C202
and C203 is good
Verify SW_B+
at C6524
Is 6 < V < 9
Verify Q6501
Check U6504 circuitry.
Enable input
present?
Check U6508 loading
V_SW_3.60
MAKO damaged. Replace
MAKO
Is radio current
>100mA
Check U201 is loading
V_SW_3.60
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No