Power (Lcd No Display Led Off) - Ricoh FAX1120L Service Manual

TROUBLESHOOTING FLOW CHART
4.5.18 NO POWER (LCD NO DISPLAY 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
NO
Check the voltage first
and plug the power cord
NO
Supply the power as the
rating
NO
Connections on
board are OK?
YES
Fusing unit of
SMPS if open?
YES
Shortage
between 5V and GND,
or between 24 V and
GND?
YES
Remove the shortage or
replace the board
NO
The connection error
between controller board
NO
and panel board or
malfunction of boards.
→ Replace the boards
NO
Re-connect firmly and
re-test
NO
Replace the SMPS
NO
AIO is in the set?
YES
Detect failure due to the
board which detects top
cover open or switch
error
→ Replace the board or
switch
4-20
10 October, 2002
NO
Put in the cartridge
H911T928.WMF