Malfunction - Samsung ML-5000A Service Manual

Troubleshooting

4-3 Malfunction

4-3-1 No Power (LED Off)
Plug in the
power cord?
YES
The power
voltage supplying is
the same as
rating?
YES
The fan
revolves when
powered on?
YES
LEDs blink
once when
powered on?
YES
The On-Line
key is being pressed
or shortage on
the panel
board?
YES
Repair/replace the
board.
4-12
NO
NO
NO
NO
The connection
NO
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 Re-connect firmly
on board are OK?
and re-test.
YES
NO
Fuse of SMPS
Replace the fuse.
is open?
YES
Shortage
between 5V and
NO
GND, or between
24V and
GND?
YES
Detect failure due to the
Remove the shortage
board which detects top
or replace the board.
cover open or switch error.
-> Replace the board or switch.
NO
Put in the
Toner cartridge
cartridge.
is in the set?
YES
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