Motorola APX 1000 Detailed Service Manual page 772

5-16
DC Supply 3.6 Volt Failure
Replace Fuse
Verify L200, C202
and C203 is good
No
Is fuse intact
(not blown)?
Yes
No
Verify UNSW_B+ at
test point: F_UNSW_B+
Yes
Verify Q6501
Troubleshooting Charts: DC Supply Failure
V_SW_5
No
Is radio current
>100mA
Yes
Is connectors from J2301 to
display connector shorted or damage?
No
Verify SW_B+
at C6524
No
Is 6 < V < 9
Yes
Check U6504 circuitry.
Enable input
present?
No
MAKO damaged. Replace
MAKO
Yes
Replace board with
damaged connector.
Yes
Check U6508 loading
V_SW_3.60
Check U201 is loading
V_SW_3.60