Troubleshooting Charts: DC Supply Failure 5-15
5.4 DC Supply Failure
5.4.1 DC Supply 5 Volt Failure
V_SW_5 supply
Is radio
drawing > 100mA
from battery
or power
supply?
Voltage
level
correct?
Replace
VOCON
board
Yes
Yes
Yes
Yes
No
No
No
No
Replace board
with damaged
connectors
Are connectors J4001
to P2001 shorted or
damaged?
Check U6505 for
enable input and
voltage output lines
Check L6504
for damage
Verify SW_B+ is
present at C6565
Measure if USB accessories
are shorting VBUS line
Verify
UNSW_B+ is
present at
Test Point:
F_UNSW_B+
Check Q6505 and
Q6506 for damage
Check
Q6501
Replace
VOCON
board
Check Q6502 and
Q6503 for damage
Replace
VOCON
board
Voltage level correct
for V_SW_5
at C6567?
Remove accessory
or cable and replace
with good device
MAKO damaged
No
Yes
No
Yes
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_5
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
Remove RF board
and ohm across
P101
(pin 28 thru 36)
and B+
(battery contact)
at the RF board
and verify fuse
F200 is intact
(i.e. not blown)
Replace RF
board
No
No
Remove
VOCON
shield(s)
No
Yes
Yes
Refer to other
troubleshooting
charts for these
voltage supplies
No
No
Check for short
to GND at
J2001-49 and
P2001-51
Replace
Expansion
board
Check if
U2101
is drawing
excessive current for
audio controller
No
Yes
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