12
Troubleshooting
12-12 bizhub 500/420
12.4 Simple Troubleshooting
Symptom Possible Cause Remedy
Main
body
The machine does not
start up when the main
power switch is turned
on.
Is no power supplied
from the electrical out-
let?
After the main power switch and
sub power switch are turned off,
correctly insert the power supply
plug into the electrical outlet.
Has the sub power
switch been turned on?
Turn on the sub power switch.
Correctly insert the
power supply plug into
the electrical outlet.
Are the doors, such as
the front doors (left and
right) or the finisher
door, open?
Securely close the doors, such
as the front doors (left and right)
and the finisher door.
Is there no paper that
matches the docu-
ment?
Load paper of the appropriate
size into the paper tray.
The printed output is
too light.
Is the copy density set
too light?
Touch [Dark] in the Density
Screen to copy at the desired
copy density. (page 4-18)
Is the paper damp? Replace the paper with new pa-
per.
The printed output is
too dark.
Is the copy density set
too dark?
Touch [Light] in the Density
Screen to copy at the desired
copy density. (page 4-18)
Was the document not
pressed close enough
against the original
glass?
Position the document so that it
is pressed closely against the
original glass.
The printed output is
blurry.
Is the paper damp? Replace the paper with new pa-
per.
Was the document not
pressed close enough
against the original
glass?
Position the document so that it
is pressed closely against the
original glass.
There are dark specks
or spots throughout the
printed output. There
are streaks in the print-
ed output.
Is the original glass
dirty?
Wipe the glass with a soft, dry
cloth. (page 13-4)
Is the left partition
glass dirty?
Wipe the glass with a soft, dry
cloth. (page 13-3)
Is the document pad
dirty?
Wipe the document pad with a
soft, dry cloth. (page 13-5)
Was the original docu-
ment printed on highly
translucent material,
such as trace paper or
overhead projector
transparencies?
Place a blank sheet of paper on
top of the document.
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