MPC 6000 doc feed problem

[Wishbone]

I have an Mpc 6000 that only jams on 2 sided copies. I was there 1st thing this morning and it jamed every copy. Looked like exit jams. I blew out the sensors and cleaned the rollers. I then ran 200 sheets flawlessly. Customer said it ran all day but now it's back to jamming only on 2 sided every copy again.

Any ideas before I go back out there in the morning?

[cobiray]

Check the turnover gate/guide and the solenoid that actuates it

[tcs04]

if there's a rubber pad near the duplex solenoid / divertor gate mechanism to stop noise stick a small piece of tape over it as they tend to get sticky and grip the gate / solenoid preventing smooth operation.