No Power (Lcd No Display Led Off) - Samsung ML-920 Service Manual

Troubleshooting

No Power (LCD NO display 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
NO
Shortage on
the OPE panel
board?
YES
Repair/replace the
board
4-33
Check the voltage first and plug
the power cord
Supply the power as the rating
Connections
on board are OK?
Fuse of SMPS
The connection
between 5V and
error between
GND, or between
controller board
and panel board
or malfunction
of boards.
-> Replace the
boards
Remove the shortage
or replace the board
NO Re-connect firmly
and re-test
YES
NO
Replace the fuse
if open?
YES
Shortage
NO
Toner cartridge
is in the set?
24V and
GND?
YES
Detect failure due to the
board which detects side
cover open or switch error
-> Replace the board or switch
NO
Put in the
cartridge
YES
Samsung Electronics