derrick@cs.AthabascaU.CA (Derrick Rowlandson) (07/19/89)
We have a number of HP series II (and Apple series II) laser printers that are developing a very ugly scratch on the fusing roller. It appears that the heat sensor (thermostat?) may be the culprit. Now with the series I engines, we were able to purchase the fussing roller as a seperate entity, and make some cost effective repairs, but we have been unable to do the same for the series II printer, HP is nailing us over $200 for a complete fusing assembly. Does anyone have any recommendation on how to avoid this problem?How about any techniques for actually repairing the fusing roller? How about a source for the rollers? Any help would be greatly appreciated. thanks in advance derrick
dan@amperif.UUCP (Dan Mehlhorn) (08/09/89)
This is for Derrick and anyone else having fuser scoring problems.
My field engineer says, "There is a thermistor and thermal switch that are
in contact with the upper fuser roller. The upper fuser roller is teflon
coated as are the thermistor and the thermal switch.
Canon toner (HP, Apple, QMS and others just license the print engine, the
cartridges are interchangable.) is magnitite coated with resin. During the
heat-up and cool down cycle of the fuser toner sticks to the thermistor and
thermal switch causing wear on the upper fuser roller.
Solutions: Either A) Replace ALL three parts (thermistor, thermal switch,
and upper fuser roller) at the same time or B) clean the thermistor and
thermal fuse with 91% (by volume) or 99% (by weight) Isopropyl Alcohol.
The lower roller (the pressure roller) should be changed with the upper
roller."
Any questions to us will be answered at (402) 498-0936. As I can only
follow up or reply to posted articles until my mailer is fixed.
Dan Mehlhorn
--
Every child deserves a home of his own. - Harry Holt
Dan Mehlhorn uucp: dan@amperif.uucp
All comments are my own. No one else should be blamed for them.