5-16 Troubleshooting Charts: DC Supply Failure
5.4.2 DC Supply 3.6 Volt Failure
V_SW_3.6 supply
Is radio
drawing > 100mA
from battery
or power
supply?
Remove
VOCON
shield(s)
Voltage
level
correct?
Replace
VOCON
board
Yes
Yes
Yes
No
No
No
Verify connectors
J1001 to P101 are
seated correctly
and not damaged
Verify battery or
battery eliminator
contacts are
connecting to the
RF board’s
spring contacts
Check U6504 and
verify enable input is
present
Check L6502
for damage
Verify SW_B+ is
present at C6565
Verify
UNSW_B+ is
present at
Test Point:
F_UNSW_B+
Remove RF board
and ohm across
P101
(pins 28 thru 36)
and B+
(battery contact)
at the RF board
and verify fuse
F200 is intact
(i.e. not blown)
Check for unstable output
voltage due to C6560,
C6561 or L6502 having
values that are out of spec
for U6504
Check
Q6501
Replace
VOCON
board
Check Q6502 and
Q6503 for damage
Replace
VOCON
board
Voltage level correct
for V_SW_3.6
at C6561?
MAKO
damaged
Replace RF
board
No
Yes
No
No
Remove
VOCON
shield(s)
No
Verify all other voltages are present
(i.e. 1.85, 1.4, etc) since if they are
absent, radio IC’s maybe preventing
MAKO from turning on and
generating V_SW_3.6
Yes
No
Check if U6508
is loading down
V_SW_3.6
No
No
Check for
short to GND
at J1001-37
or J4001-41
Check if
U2204 is
damaged
No
No
No
No
Yes
Replace board
with damaged
connectors
Are connectors
J4001 to P2001
shorted or
damaged?
Yes
Refer to other
troubleshooting
charts for these
voltage supplies
Check for
short to GND
at J2001-41,
P2001-28
Replace
Expansion
board
Check if
regulator U2402
is drawing
excessive current for
GPS_BT_3.3v sources
No
No
No
Check if
BlueTooth U2401
is drawing
excessive current
Yes
Check if
regulator U2405
is drawing
excessive current for
GPS_BT_2.8v sources
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