AC-DC Power Supply (PSU) Troubleshooting
Properly terminate PA into 50ohm load.
YES
PSU is
operating
correctly.
NO
Apply proper AC power to back panel
(check if 110V or220V).
Turn on AC rocker switch on back panel.
Reset circuit breaker on back panel.
DC
voltage on
display
correct?
AC breaker tripped?
NO
NO
NO
YES
YES
YES
NO
Remove lid of enclosure with power supply.
DANGEROUS
VOLTAGES INSIDE!
AC voltage present
on PSU input?
NO
Faulty AC connection, entry, switch, or breaker.
DC voltage present
on PSU output?
YES
Disconnect DC loads (tape off so they do not
short out) to see if DC output loaded down.
Proper DC voltage
on PSU output?
YES
YES
NO
Bad PSU - magic smoke released.
Replace PSU.
Pallet, fan, or control system loading PSU down.
Troubleshoot control system or RF signal path.
Last Updated: 12-Jul-2011
Is PSU in
shutdown mode?
NO
YES
Remove shutdown conditions and
reset the PSU.
Display
on?
Display and
PSU come
back on?
Screen not displaying, but DC PSU
voltage okay. Troubleshoot control
system.
Turn off power from back panel.
