Archived from groups: comp.periphs.printers (
More info?)
"Bob Kos" <see@text.for.eddress> wrote:
><Tony> wrote in message news
art1of1.1.jbCMQoaDK$40Uw@ue.ph...
>>
>> Several possibilities but first of all you need to carefully look at the
>toner
>> cartridge. Hold it as if you are going to put it in the printer, look at
>the
>> top near the left hand side, there should be a plastic tab about one inch
>from
>> the left and about 1/2 inch high almost triangular. This opens the scanner
>door
>> when you put the cartridge into the printer, if this broken (seen a few of
>> those) or even slightly bent (should be dead vertical) the scanner door
>will
>> not open and you will print blank pages. The printer does not check to see
>if
>> the door is open.
>> Check that first.
>> Tony
>
>Hi Tony:
>
>Thanks for your reply. I have checked the toner cartridge as you have
>suggested above. It looks fine. I went one step further by pulling the
>upper cover off and removing the cover from the laser housing. I then
>inserted the cartridge and watched for movement of the metal door. It
>swings 90 degrees and allows a seemingly clear path from the lense to the
>prism at the front of the laser housing.
>
>You mention that there are several possible problems that may cause the
>problem I'm having. Can you offer any other suggestions?
>
>I appreciate your help.
Pity, that was the easiest possibility.
The service manual suggests the following: with some additional information I
have added.
White or missing image
No toner is available for print. Remove sealing tape or replace the
toner cartridge.
Defective laser shutter. Check that the laser shutter operates
freely when the toner cartridge is installed.
Toner cartridge guide damaged, improperly
positioned, or missing. Make sure the guide is installed
properly above the toner cartridge.
No transfer roller voltage. Without transfer roller voltage, toner
cannot be attracted from the surface of the drum to the print media.
Perform the half self test functional check to check
all other electrophotographic processes.
Perform Half self test functional check.
Put a sheet of paper on the manual feed and push the button on the printer for
a self test. When the paper is about 3/4 of the way into the printer, open the
top cover to stop the printer. Remove the toner and push back the flap on the
toner cartridge and see if there is an image on the toner drum. If there is,
your isssue is probably the transfer roller which sits below the toner
cartridge. If no image your issue is the toner cartridge, laser/scanner
assembly to include the shutter as mention above or cable going to it, or high
voltage issue either the contacts or the main board. Replace the transfer
roller if necessary.
No developing bias. Clean the high-voltage power supply
contacts. With no developing bias charge, toner is not attracted to the
drum. Replace the power supply.
No drum ground path. With no ground path, the drum cannot
discharge. The negative charge on the drum repels toner, and leaves a white
page with bubble print. Check the drum ground spring and
reconnect it, if necessary. Replace the power supply PCB.
Defective laser scanner cable assembly. Low-level signals exchanged between
the laser/scanner assembly and theengine controller PCB might be
affecting laser output. Replace thelaser/scanner cable assembly.
I suggest you do the half test first, this will show if the scanner is OK, if
the drum has an image on it the scanner is working and the transfer roller is a
possibility.
Tony