mx6200

[bonnie750]

Can someone please refresh my memory, or maybe tell me i was imagining it, but i was sure there was a bulletin on Sharp site concerning duplex jams on this model. Something about the paper guide post-fuser distorting with the heat from the fuser.Can't find it on UK site. the machine we've got jams every duplex copy, paper goes into paper-pass unit then collides with the gate as it tries to go round for the second side and calls an APPD1_N code. Wondered if distortion was causing the gate to stick and prevent the paper passing. simplex copies no problem.
It also sometimes shows a paper jam in the paper pass unit though no paper is present. This clears sometimes when the left door is opened ,sometimes not. sensors are good

Bill

[OMD-227]

The paper guide becoming warped due to fuser heat was on the C-Jupiter1's (MX3500/4500).

On the C-Dragons, there is a few things to look at with constant d/s jamming.

- If the main problem is lead edge hitting the reverse gate, the reverse gate is too sluggish to drop down out of the way fast enough. It should drop down from horizontal to vertical almost instantly. If it is slow to drop down, the fingers on that gate catch the lead edge as it is too slow getting out of the way. Take the clip off the end of the shaft, remove the gate & bushings, give a good clean & lubrication.

- See if your fuser unit has the latest modifications of the modified upper PG and 4 white guide sheets. These help transport the paper out of the fuser smoother and with less catching.

- Jams showing in the paper pass unit, which are cleared by opening/closing the main door, is usually a sluggish POD2 sensor. As the POD2 sensor is located within the delivery unit, the POD2 arm & spring can get a buildup of web oil contamination on them, causing them to work ok, but be very sluggish in operation. Its easy to take the delivery unit out, then remove the top cover with the fans, and clean the POD2 shaft & maybe re-tension the spring if needed. The sensor is always good in testing or in sim, but once the machine is on a long print run, and is working at full temperature, the problems of sluggish sensors arms/springs and reverse gates start to appear.

- If the lead edge always makes APPD1 sensor, and then throws the code, there is a good chance that the APPD1 sensor is dead. I've had a few over the years give a reading in simulation of working, but in normal user mode, be completely dead. Sometimes that APPD1 sensor is the problem, because its sits so close to the fuser, it can play up.


How I read your post Bill is more of a sticky reverse gate. But check all the other items as well.

[OMD-227]

Another thing I forgot to mention, is check that your C-Dragon has the pawls fitted to the reverse PG unit. The Venus series and the last production run of the C-Dragons had the 5 pawls fitted to the reverse PG unit, helping keep toner buildup off the gate & PG ribs.

Check Part Guide section 25, items 15 & 16 for the Venus, items 101 & 102 for the C-Dragon. I've done these mods years ago with machines that didnt have them done already, and have had no problems in that area other than the sluggish gate which is normal.

[OMD-227]

Check the RBX2 reverse tray & rail unit. Sometimes the spring or hooks break on the reverse gate of that part (different from the reverse gate in the side door).
If the gate of the RBX2 reverse tray is not actuating up/down, the paper will be in the wrong place as it begins the transport towards the ADU. This can cause the paper to be not far enough through the delivery unit, therefore causing the lead edge to crash into the reverse gate in the side door. This will also give APPD1_N jams.

[bonnie750]

Thanks once again Wazza, machine sorted.

Bill

[OMD-227]

Out of sheer curiosity............ what was the problem?

[bonnie750]

an accumulation of things Wazza. tight sensor flags and the flag on the paper pass entry not clipped in straight. only spotted when the exit unit was removed.

Bill