5
Troubleshooting
5-44 bizhub 501/421/361 (Version 2)
5.3 Simple troubleshooting
Symptom Possible cause Remedy
Main unit The machine does not
start up when the main
power switch is turned on.
Is no power supplied from the elec-
trical outlet?
Correctly insert the power supply
plug into the electrical outlet.
Has the sub power switch been
turned on?
Turn on the sub power switch.
Copying does not start. Is the upper right-side door of the
machine open?
Securely close the upper right-side
door of the machine.
Is there no paper that matches the
original?
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 densi-
ty. (See p. 3-60.)
Is the paper damp? Replace the paper with new paper.
(See p. 2-49, p. 2-52 and p. 2-57.)
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 densi-
ty. (See p. 3-42.)
Was the original not pressed close
enough against the original glass?
Position the original so that it is
pressed closely against the original
glass. (See p. 3-9.)
The printed output is blur-
ry.
Is the paper damp? Replace the paper with new paper.
(See p. 2-49, p. 2-52 and p. 2-57.)
Was the original not pressed close
enough against the original glass?
Position the original so that it is
pressed closely against the original
glass. (See p. 3-9.)
There are dark specks or
spots throughout the print-
ed output.
There are streaks in the
printed output.
Is the original glass dirty? Wipe the glass with a soft, dry
cloth. (See p. 10-3.)
Is the left partition glass dirty? Clean the left partition glass with
the left partition glass cleaner. (See
p. 10-3.)
Is the document pad dirty? Clean the document pad with a
soft cloth dampened with a mild
detergent. (See p. 10-3.)
Was the original printed on highly
translucent material, such as diazo
photosensitive paper or OHP
transparencies?
Place a blank sheet of paper on top
of the original. (See p. 3-9.)
Is a double-sided original being
copied?
If a thin double-sided original is be-
ing copied, the print on the back
side may be reproduced in the
copy. Touch [Light] on the Back-
ground Removal screen to select a
lighter background density. (See
p. 3-52.)
Are the writing unit glass and elec-
trode wires dirty?
Clean the writing unit glass and the
electrode wires. (See p. 10-4.)
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