AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 18

Problem

Cause

Remedy

The ready lamp (green) does not
light up.

The power switch is not turned
on.

Turn on the power switch.

The power cord is not connected
properly.

Check the power cord connection.

The GDI driver cannot be
installed.

There is no sufficient free space
in the hard disk of the computer.

Delete unnecessary files and applications to assure enough space.

The operating system is not
compatible. 

Use the proper operating system (Windows 95, Windows NT4.0).

The printer does not print.

The interface cable is not
connected properly.

Check the interface cable connection. 
(Check that it is of bi-directional.)

The interface cable is defective.

Use the computer and the printer to check that the cable is proper or
not. If necessary, replace the interface cable. 

Incorrect port setting

Check Windows control panel printer setting to confirm that the print
job is sent to the proper port (for example, LPT1).

Improper installation of developer
cartridge and photoconductor
cartridge

Check that the developer cartridge and the photoconductor cartridge
are properly installed. 

Paper jam

Remove the paper jam.

Incorrect configuration setting of
the printer

Perform the GDi test print. If the test print is made properly, GDI
printing is properly made. Check the application to confirm that the
print setting is proper or not. 

Incorrect installation of GDI

Reinstall the GDI software and try printing the test page.

Paper is not fed to the printer.

Improper setting of paper

Set paper properly.

The paper release lever is not
pushed back.

Insert paper into the paper feed tray and push back the paper release
lever.

Too much paper is loaded in the
paper feed tray.

Remove some paper from the paper feed tray.

The whole page of printed paper
is blank.

Improper installation of developer
cartridge

Install the developer cartridge properly.

Developer cartridge empty

Replace he developer cartridge.

Half page of printed paper is
blank.

Too complex page layout

Simplify the paper layout. If possible, remove unnecessary format
commands from the document.

Reduce resolution setting. If currently set to 500dpi, change to 300dpi. 

Install an expansion random access memory (RAM) to the computer.

Incorrect setting of page
orientation

In the printer setup dialogue box, change the page orientation.

Too many applications are open.

Close all the applications before printing.

Reduce the resolution setting. If it is set to 600dpi, change to 300dpi.

Install an expansion random access memory (RAM) to the computer.

Half page of printed paper is
blank.

The size of paper in the printer is
greater than that specified by the
application or Windows Printing
System.

Set proper paper to the printer.

Scaling is set to a lower level
than 100%.

In the printer setup dialogue box, change the scaling.

Incorrect specification of the
interface cable

Check the interface cable specification, or replace the cable with an
EEE-1284 cable.

Incorrect specification of the CPU

Check that the CPU satisfies the specifications. 

Insufficient capacity of
computer’s random access
memory RAM

Install an expansion random access memory (RAM) to the computer.

The printer prints erroneous
characters or erroneous data. 

Improper connection of the
interface cable

Check connection of the interface cable. 

The GDI software may cause the
problem.

Cancel the Windows mode and resume the computer.

Turn off the printer and turn it on again.

Incorrect specification of the
interface cable

Check the interface cable specification. 

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