Motorola APX 3000 Detailed Service Manual page 106

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DC Supply 3.6 Volt Failure

Replace Fuse

Verify L200, C202

and C203 is good

Is fuse intact

(not blown)?

Verify UNSW_B+ at

test point: F_UNSW_B+

Verify Q6501

Troubleshooting Charts: DC Supply Failure

Is radio current

Verify SW_B+

Is 6 < V < 9

Check U6504 circuitry.

Enable input

MAKO damaged. Replace

Check U6508 loading

Check U201 is loading

Troubleshooting