[Misc] SR790 Stapler Misaligned / Misses Paper

[Jason Engram]

[davel]

Re: SR790 Stapler Misaligned / Misses Paper

Good luck, clean everything related to stapler movement, sensors, shafts, bushings, lube all moving parts, then try staple position adjustments.

[slimslob]

Re: SR790 Stapler Misaligned / Misses Paper

If it is consistently the same distance off, I would replace the home position sensor. Due to its age the sensor has built up a hysteresis delay when the staple head moves out. The control logic does not start counting the head position until after the signal from the sensor changes. This is to allow for take up of slack in the drive.

[Jason Engram]

would fire off exactly 11 (no more, no less every time) perfectly crimped staples into absolutely nothing^nd pair of glasses.

There was a small nick in the wire where it entered the crimp. Upon flexing the wire back, I was able to see the stinking thing was completely broken. How I missed this before, I've not a clue.

After splicing a new wire and new crimp in to the ground wire and screwing it into place, and reattaching the 2 other plugs, I closed the door and flipped the power switch.

The unit came on, and I could hear the stapler slide to the far side and back (the one benefit of the WD-40 was that it is now very quiet!)

This time it did not fire off any staples at all.

I ran a copy job, and specifically told it to staple. The staple hit the paper perfectly.

[Jason Engram]

REPAIRED: SR790 Stapler Misaligned / Misses Paper

After rereading the thread, I just realized I forgot to make an earlier post.

AFTER the misalignment problems started happening, I DID take out the bracket, and the stapler unit, and pulled everything apart, and cleaned all of it, as others suggested. I did not disassemble the stapler motor and hammer unit itself, though I did take it off the bracket that slides back and forth, that the motor is mounted to. I did mist a little bit of WD-40 onto the stapler hammer gears, and hammer itself.

I did not take the cables off of the logic board, but simply unplugged the plugs going into the stapler motor, and unscrewed the grounding wire. Everything was actually pretty simple to disassemble.

It was after reassembly that things actually got worse. At that point, it now completely failed to operate at all, firing off the aforementioned 11 perfectly crimped staples at the "home" position, and throwing the error.

Thereafter, the copier/printer would only work if I had an empty staple cartridge in the stapler.

Apparently, the grounding wire was just about to break prior to my removing the unit and cleaning everything. I'm not an electrician or programmer, so I can only presume that the wire must have initially been producing enough resistance to confuse the stapler about its location, thus causing the staples to be misaligned.

Cleaning the unit probably then completely broke the ground wire inside the insulation, and ultimately caused the unit to go completely nutty.