Booklet finisher jam J129 on a pro 8120

[toddanderson]

Paper jams in the booklet finisher ever time J129 after I remove the jam SC720-53
Shows. Jam on 8 ½ x 11 or 11 x 17 paper.
It looks like the black paper side guides are not in the correct position.
As the paper is coming into the staple unit the paper runs into the black sid e guide.
The side guide seem several inches to narrow of the width so the paper runs into it.
The guide seen to go home correctly, but when making a booklet the guides seem to move into the width size or something

[slimslob]

Forget about the jam. The SC720-53 is what you need to be trouble shooting. When an error occurs in a downstream device, the main frame detects the stoppage of paper movement first. After you open and close the door, the actual error is displayed.
SC720-53

• Finisher: Booklet stapler bottom fence motor error When the component moved to the home position, the sensor could not detect the component within the prescribed time (1st error triggers a jam, 2nd error issues this SC code).
• When the component moved from the home position, the sensor could not detect the component within the prescribed time (1st error triggers a jam, 2nd error issues this SC code).

Possible causes

• Motor defective
• Connector loose, broken, defective
• Motor overload
• HP sensor dirty, disconnected

[anothertech]

Check the finisher sensors in IO mode.

[GIUBOSS]

lubricate all steel shafts. Try swapping or replacing motors that probably don't work well.