HP 1120C dismantling

[Steve]

This is going to sound daft, but how do you dismantle a HP 1120C? It works
fine, but the build of ink inside is getting everywhere and it needs a good
clean. I have the tools but can't seem to get the case off. I have removed
the 4 obvious torx screws, but the top is stuck fast. Any ideas?

 

[Forristal]

---working from memory as the printer is in the office ---

BEFORE you try removing the top case you need to remove the power supply
cover- this is the rectangular plastic bulge housing the power connector
and parallel port. You need a (pair of) thin bladed screwdrivers or kitchen
knives to release clips on the left and right sides of this casing, gently
pull out horizontally.

For the top case- look under the printer and you will find 4 slots, two at
rear left and right, two at front laft and right, which if you gently probe
with a narrow flat head screwdriver will release clips which hold the
plastic top case securely to the metal base. With a bit of dexterity
required you will get all 4 clips disengaged and simply lift the cover. Some
wiring connects the front panel to a rear board - the wires can be unplugged
from the main board easily to allow full removal of the plastic case.

Once open if you need to go deeper you may need a smaller torx head for some
of the components. Most of the drive bars are held by plastic bushings which
can be released easily by partial rotation.

From memory in addition to a pad to soak surplus ink in the base there was
also a "tank" to the left of the cartridge parking area in which a large
waxy stalagmite of ink was growing - I used a tweezers to pull out most of
this. You also need to rotate a drum in the parking area and clean the
various wipers and rubber seals on the drum.

I opened same model recently as it was suffering from paper path problems -
if your suffers from poor pickup, multi-page pickup (major jam!), blank
pages within multiple page docs or similar I would advise while you have
cover off etc take out and clean well the rollers (single pickup and
multiple travel)- I used cloth damp with water and detergent solution after
VERY light sanding to clean and remove any glaze. I also pulled the rubber
pickup roller to one side off its mount - do this gently - and packed a
couple of rounds of pvc tape onto the metal bar to thicken it slightly. Cut
locally to let the cam reappear and slide the rubber roller back in its
correct alignment. I dont know if all this would meet the approval of HP but
it has rendered useable a printer which I felt was probably not worth
getting repaired professionally.

 

[Steve]

Okay, I've got top case off but I need to take it apart further. The ink has
built up on the base plate and is covered quite thickly in the front right
corner (under the head parking area). How do I get this base plate off or
the whole mechanism off the base plate in one go? I'm afraid to take
individual components off incase I either lose something or break something.
I don't wish to clean anything except for getting all this ink off.

 

[Forristal]

Sorry I can't help on that one - from memory I think it probably has to be
taken apart piece by piece.

While you have it apart do consider a general cleaning because these models
do have a history of paper feed problems in later life.

 

[Steve]

Thanks for your help.

Sorry I can't help on that one - from memory I think it probably has to be
taken apart piece by piece.

While you have it apart do consider a general cleaning because these models
do have a history of paper feed problems in later life.

two most