Loose Spring inside Color LaserJet CP2025

[hamachi]

While investigating a chronic paper jam in a Color LaserJet CP2025 Product Number CB495A, I opened the rear door and noticed a 9 3/8" horizontal metal bar that was loose.  This sheet metal bar clips onto the shaft of the registration roller (labeled as item #15 on the diagram on page 59 of the service manual) with some black plastic clips.  It appears that the bar blocks the paper, causing the jam.

Pressing the bar firmly clicks it into place on the shaft.  Unfortunately, this change does not cure the chronic paper jam problem.

Further examination reveals a loose spring winding around the shaft of the registration roller.  I presume that this spring is supposed to attach to the previously-mentioned horizontal metal bar, but it isn't clear how to do this.

My questions:

1. Can you confirm that the horizontal bar supposed to click firmly onto the registration roller shaft?

2. Does the spring connect to the horizontal bar?  If so, how?  It could hook into a couple of different holes in the bar.  My guess would be the hole to the far left (when looking through the rear door of the printer).

3. Does the spring attach in a straightforward manner, or do I have to wind it up to get the correct tension?

[Repairatrooper]

Can you post a picture of what you are seeing.

[hamachi]

Thank you.  I didn't know that photos were allowed.  This makes things easier.  It would be great if someone who has one of these printers can open the rear door and see if/where the spring attaches.

Here is the horizontal bar in question, removed from the printer:Here is the horizontal bar. It has various holes that a spring might engage

The spring in question is coiled around a horizontal metal shaft.  It is shown to the left of the white piece:

The spring in question winds around the shaft, to the left of the white plastic piece

The horizontal bar clips onto the metal shaft with black plastic fingers:

The horizontal bar, in position inside the printer.

[hamachi]

Here is a close-up of the spring.  You can clearly see that the end of the spring has a hook that might engage some other part.

Doesn't the hook on the end of this spring engage with something?

[Repairatrooper]

Yes the bar clips on and the spring is hooked through the hole on the left side, hopefully this picture of an intact registration shutter gives you enough guidance.

[hamachi]

Thank you.  Can you tell which end of the spring attaches to the bar?  Is it the inboard end or the outboard end?  Also, what secures the opposite end of the spring?

[Repairatrooper · Accepted solution]

The inboard side of the spring is attached to the metal bar. I cannot see if the outer end of the spring wraps around anything or not without taking the printer apart. As long as there is enough tension to keep the shutter in the up position it should not matter.

[hamachi]

Thanks!  Your information is exactly what I needed.

Now I will replace the paper pickup roller and then see if there are any other problems.

[hamachi]

It looks to me as if the outboard side of this spring attaches to a notch in the metal frame, on the left side of the horizontal shaft.