Hello Everyone!

Sikna says,

Tired of shredded plastic films in your HP LaserJet 4200 printers???

Wouldn't it be nice to be able to have a heavy-duty metal-film sleeved fuser like the 4250, 4300, 4345 and 4350 use installed in your 4200?

It can be done and very easily. I have one in service and it works flawlessly. Toner is very well fused and no issues have developed in months of regular use.

To convert the metal-sleeved 4300 fuser for use in the 4200:

Remove the tan plastic back cover by taking out the two screws holding it then sliding it downward to disengage the small tabs (one each side and one on the bottom) holdin it.

When replacing this cover be sure to get the two upper plastic u-shaped catches under the corresponding metal tabs which are at each end right by the output roller shaft bushings and get the bottom metal tab into the plastic slot.

This will reveal the wires/jumper going into the back of the black electrical connector.

There is one jumper with a small loop of wire attached to it. Just pull this wire loop and the attached small connector out or the attachment block.

Now your HP LaserJet 4300 fuser will be accepted by the electronic detection system in the printer and work fine in your 4200.

There is another issue with the loose fit of all these 42xx/43xx fusers. The latches on the 4200 were plastic and the one on the gear side would break off at the tip and then the already wobbly fuser would really be loose!

HP addressed this by switching to a metal-reenforced latch which does not break. Still the fuser is not held solidly in position with this latching system.

Just take hold of the fuser and you can tip it back and forth easily. This sloppy fit causes accelerated wear on the gear teeth meshing the fuser with the printer. If this has advanced to a serious level, with the fuser removed, you will see a little pile of plastic shavings at the left of the fuser opening right under the swing-plate gear.

If you don't see this yet, it will happen but take more printing to show up.

The swing-plate and fuser gear can be easily replaced, but the problem will happen again.

The real fix is to remove the flimsy latches and use screws to fasten the fuser solidly into place, thus holding the gears rigidly in mesh and stopping the movement causiing the premature wear.

I have developed custom made parts to do this. If you are interested let me know.

Sikna out...