Samsung SCX-5935FN Service Manual page 136

No Power (LCD NO display LED Off)
Plug in the
power cord?
YES
The power
NO
voltage supplying is
the same as
rating?
YES
The fan
revolves when
powered on?
YES
LEDs blink
once when
powered on?
YES
NO
Shortage on
the OPE panel
board?
YES
Repair/replace the
board
Service Manual
Alignment & Troubleshooting
NO
NO
NO
The connection
error between
controller board
and panel board
or malfunction
of boards.
-> Replace the
boards
Check the voltage first and plug
the power cord
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
Detect failure due to the
Remove the shortage
or replace the board board which detects side
cover open or switch error
-> Replace the board or switch
4-85
Re-connect firmly
and re-test
Replace the fuse
NO
Toner cartridge
is in the set?
YES
Samsung Electronics
Put in the
cartridge