Sharp MX3501

[Vesigoth]

This machine is giving me a "close upper right side door" on the display. DSW F and DSW R are highlighted on Sim 30-1 when all the doors are closed. A Sharp tech adviced me that they shouldn't be if all the doors are closed. I'm assuming that DSW F is the front door interlock switch, but not sure where DSW R is located. Is it possible that the big connector on the right side door (frame) is faulty? Have any of you seen this problem before?

Thanks

[OMD-227]

The right side door switch is located up & under the black plate on the rear frame (near the contacts for the secondary belt unit contacts). If you push a scewdriver up inside the hole at a 45 degree angle you'll hit the sensor switch.

If you hit that switch for too long, you'll get an F2 code for a trouble on the temp/humidity sensor located in the side door (obviously as the door is open & cannot be communicated with).

I've never seen that sensor go bad, but there is a chance I suppose.

[OMD-227]

Just re-read this post.

If both front & right side door switches are open in simulation, but both doors are closed, check CN4 on the PCU board. Both DSW-R & DSW-F have a harness connecting to CN4.

Possible PCU board fault or reseat plug & check operation.

[Vesigoth]

Thanks for the tip wazza. I found DSW R had the metal actuator torn off therefore when the right side door was closed the switch could not be depressed by the door. I checked the manual and from the drawing, I'd never would have guessed that the switch was located by the secondary transfer belt contacts. Apparently the front door switch and the right door switch are in series, so if one door is open, both switches show open in SIM 30-1. Thanks again mate.

[OMD-227]

Yeah, I guessed they were linked somehow when the harness going to CN4 on the PCU board only has door switches on that line.

Keep that door switch location in mind, as its a good diagnostic tool to see fuser lamps activating, fuser rollers rotating (any unusual noises as well) and the primary belt rotating. You are able to view all this with the main door open. Just remember, dont panic about the F2 code which will be listed in the trouble list, as the temp/humidity sensor is disconnected during that diagnostic testing. Just clear it in 24-01. Theres no need to run sim 14. Once the main door is closed, the communication is back on between engine & temp/humidity sensor in the bypass tray.