Motorola APX 1000 Detailed Service Manual page 774

5-18
DC Supply 1.85 Volt Failure
V_EXT_1.85
Verify V_SW_3.60 is
present at R6510
Yes
Voltage 3.6V?
No
Refer troubleshooting guide
5.4.2 DC supply 3.6V
Troubleshooting Charts: DC Supply Failure
Verify BGAP_COMP
is present.
No
Check BGAP_COMP
2.2 < V < 2.7?
Yes
Check U6508
circuitry
Check for damage
to Q6507
Check BGAP_COMP
circuitry
Check if U6101,
Check if U6302 is
U6405, U6301 and
drawing high
U6304 is draining
current thru E6501
high current
Check for connector
Check if keypad is
damages from J2301 to
draining high
frontkit flex
current.
Replace main board
circuitry