Motorola APX 3000

5-18 Troubleshooting Charts: DC Supply Failure
5.4.4 DC Supply 1.85 Volt Failure
Yes
No
Yes
Voltage 3.6V?
Verify BGAP_COMP
is present.
2.2 < V < 2.7?
Check BGAP_COMP
circuitry
Check for damage
to Q6507
Check if U6101,
U6405, U6301 and
U6304 is draining
high current.
Verify V_SW_3.60 is
present at R6510
Replace main board
Refer troubleshooting guide
5.4.2 DC supply 3.6V
V_EXT_1.85
No
Check U6508
circuitry
Check BGAP_COMP
circuitry
Check if U6302 is
drawing high
current thru E6501