[Error Code] SC721-81 On MPC4504 SR3220 finisher

[copier tech]

[UNICORNico]

Re: SC721-81 On MPC4504 SR3220 finisher

Good mate.


I understand according to the extended expectations of the error, that a problem occurs with the stapler motor. Check the classifier's pads, prior to stapling the pages, check if the rotation / trallect of the "stapler motor" moves correctly.


If all these parts move normally, check sensors, dust or dirt can generate false jams.

I await your reply.

[copier tech]

Re: SC721-81 On MPC4504 SR3220 finisher

Good mate.


I understand according to the extended expectations of the error, that a problem occurs with the stapler motor. Check the classifier's pads, prior to stapling the pages, check if the rotation / trallect of the "stapler motor" moves correctly.


If all these parts move normally, check sensors, dust or dirt can generate false jams.

I await your reply.

According to the manual my code SC721-81 has nothing to do with the staple unit.

"SC721-81 B Paper Guide Drive Motor Error• During movement to home, the home position could not be detected
within a predetermined pulse (1st time is jam notification, 2nd time is
SC notification).
• During movement from home, the home position was detected for
longer than a predetermined pulse (1st time is jam notification, 2nd
time is SC notification)."

[UNICORNico]

Re: SC721-81 On MPC4504 SR3220 finisher

According to the manual my code SC721-81 has nothing to do with the staple unit.

"SC721-81 B Paper Guide Drive Motor Error
within a predetermined pulse (1st time is jam notification, 2nd time is
SC notification).

longer than a predetermined pulse (1st time is jam notification, 2nd
time is SC notification)."

[copier tech]

Re: SC721-81 On MPC4504 SR3220 finisher

[Imprestik]

Re: SC721-81 On MPC4504 SR3220 finisher

I have had this and it's a stupid code cause of the stupid designers in Japan trying to be way to clever.

Every time you print a document a set of black fingers on each side of the sponge rollers comes out to assist the paper coming out in a straight path on the shift tray only.

The stupid designers have now decided to put a clear set of mylars on the top side of these black fingers to be absolute idiots.

Anyway these mylars are shaped like a tip of a lizards tongue and they bend back and seize the fingers from going in and out causing the above service code.

The motor located to drive these fingers is at the front side of the finisher under the shift tray and parallel to the staple unit when in its home position.

Turn the motor which has a little belt on it to its limit which will expose these fingers and rip the mylars off both fingers cause they will give jam code 159 as well, in fact rip them off every finisher you go to cause I will guarantee you, every single tech will be going to every single machine with this finisher after around 40 thousand prints and having the exact same problem.

[blazebusiness]

Re: SC721-81 On MPC4504 SR3220 finisher

Hi all,

I’m stuck with this error & the main finisher unit wont pull out!

Manual says “Paper guide home position motor error” however I dont know which “paper guide” it is referring to, any ideas?

Thanks in advance.

Thank you Ricoh for making all of your newer finishers with sheet metal so thin that everything gets deformed/bent out of shape just by breathing on them.


The Paper guide drive motor and home pos sensor are inside the front door underneath one of the upper plastic covers see pics.SR 3220.pdf

That code has to do with the shift tray area so it's a mystery to me why you can't pull out the lower booklet/stitch assembly. Something obviously must be stuck inside interfering with the home position movement. Imprestik may be onto something with the mylars. I'm sure by now you've removed all the covers to try and see what's interfering with home position and also stopping the stitch unit from opening.

[copier tech]

Re: SC721-81 On MPC4504 SR3220 finisher

Thank you Ricoh for making all of your newer finishers with sheet metal so thin that everything gets deformed/bent out of shape just by breathing on them.


The Paper guide drive motor and home pos sensor are inside the front door underneath one of the upper plastic covers see pics.[ATTACH]40146[/ATTACH]

That code has to do with the shift tray area so it's a mystery to me why you can't pull out the lower booklet/stitch assembly. Something obviously must be stuck inside interfering with the home position movement. Imprestik may be onto something with the mylars. I'm sure by now you've removed all the covers to try and see what's interfering with home position and also stopping the stitch unit from opening.

Thanks for the info, I have the manual. Your pic shows the SR3210 mine is the SR3220 booklet finisher.

[blazebusiness]

Re: SC721-81 On MPC4504 SR3220 finisher

Thanks for the info, I have the manual. Your pic shows the SR3210 mine is the SR3220 booklet finisher.

Actually, if you look in black square in the margin............that is the combined manual for both the booklet and the non booklet which I posted. As far as I can tell that code has nothing to do with the booklet portion of the finisher.
Good luck with that finisher and let us know when you find the fix.

[copier tech]

Re: SC721-81 On MPC4504 SR3220 finisher

Actually, if you look in black square in the margin............that is the combined manual for both the booklet and the non booklet which I posted. As far as I can tell that code has nothing to do with the booklet portion of the finisher.
Good luck with that finisher and let us know when you find the fix.

[Imprestik]

Re: SC721-81 On MPC4504 SR3220 finisher

I had this error again only this week on a brand new device that got delivered

Removed the shift tray drive gears, set it to its lowest limit and put everything back together

finisher reset its self back to its home position and bang it was fine

[copier tech]

Re: SC721-81 On MPC4504 SR3220 finisher

I had this error again only this week on a brand new device that got delivered

Removed the shift tray drive gears, set it to its lowest limit and put everything back together

finisher reset its self back to its home position and bang it was fine

Thanks for the info, I did try this, out of interest how did you lower the tray? I took front & rear drive gear off to allow it to drop but there must be an easier way!?

[Imprestik]

Re: SC721-81 On MPC4504 SR3220 finisher

Thanks for the info, I did try this, out of interest how did you lower the tray? I took front & rear drive gear off to allow it to drop but there must be an easier way!?

No that's the only way I'm afraid.

When you did it did the motor drive the shift tray back to its home position?

[sturmtrooper]

Re: SC721-81 On MPC4504 SR3220 finisher

Thanks for the info, I did try this, out of interest how did you lower the tray? I took front & rear drive gear off to allow it to drop but there must be an easier way!?

No that's the only way I'm afraid.

When you did it did the motor drive the shift tray back to its home position?

Just about all of the stand up finishers will have a large gear held in place by a spring at the top rear of the finisher. If you take the rear cover off you can see it and if you pull it towards the outside of the finisher it will decouple from the drive and the shift tray will drop like a rock. It's not easy to move if you don't take a the top cover off though. Once you let go it will pop back into place and the drive will work as normal.

https://i.imgur.com/8qXtq8t.jpg

This picture should give you a good idea of what I mean.

[Imprestik]

Re: SC721-81 On MPC4504 SR3220 finisher

Just about all of the stand up finishers will have a large gear held in place by a spring at the top rear of the finisher. If you take the rear cover off you can see it and if you pull it towards the outside of the finisher it will decouple from the drive and the shift tray will drop like a rock. It's not easy to move if you don't take a the top cover off though. Once you let go it will pop back into place and the drive will work as normal.

https://i.imgur.com/8qXtq8t.jpg

This picture should give you a good idea of what I mean.

In your photo you are describing the older type finishers that sit on a MPC4502/5502 and older as the shift tray was driven by belt.

From the MPC5503 with finisher types SR3140/3150/3160 and 3170 they are gear driven only.

The shift tray has arms on it with a long straight gear which meshes with a circular gear and the drive motor for it is located parallel with the staple unit in its home position at the front of the finisher and not as the rear as shown in your photo