Dc Supply Failure - Motorola APX 1000 Detailed Service Manual

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Troubleshooting Charts: DC Supply Failure

DC Supply Failure

DC Supply 5 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

Is radio current

Verify if USB accessory is

shorting VBUS line.

Verify SW_B+

Is 6 < V < 9

Measure BGAP_COMP

voltage at R6543

Is 2.2 < V < 2.7

Check BGAP_COMP circuitry.

Replace defective part

Replace accessory

Check Q6502 and

Q6508 for damage

Check U6505 circuitry. If good,

change U6505

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