No Power (Led Off) - Samsung ML-4500/XEV Service Manual

No Power (LED Off)

NO
Plug in the
power cord?
YES
The power
NO
voltage supplying is
the same as
rating?
YES
The fan
NO
revolves when
powered on?
YES
LEDs blink
NO
once when
powered on?
YES
The On-Line
NO
key is being pressed
or shortage on
the panel
board?
YES
Repair/replace the
board
Samsung Electronics
Check the voltage first and plug
the power cord
The connection
error between
controller board
and panel board
or malfunction
of boards.
-> Replace the
boards
Remove the shortage
or replace the board
Supply the power as the rating
Connections
NO
on board are OK?
YES
NO
Fuse of SMPS
if open?
YES
Shortage
between 5V and
NO
GND, or between
24V and
GND?
YES
Re-connect firmly
and re-test
Replace the fuse
NO
Toner cartridge
is in the set?
YES
Detect failure due to the
board which detects top
cover open or switch error
-> Replace the board or switch
Troubleshooting
Put in the
cartridge
4-23