Bizhub 754 feeding trays 3 and 4 at the same time

[copyman]

Exactly my thoughts blackcat. And exactly why I avoid calling K/M tech support. Always a bad board with them.

[femaster]

This might sound silly to you, but I would spend some time tracing down the wire harness between the pickup clutches at tray #3 & #4, and the MFPB. During all this disassembly/re-assembly a wire providing ground to one of these clutches may have been pinched to frame. Since most copiers are ground switching and the 24vdc is always present to the clutch, the moment the machine boots up, one of these clutches may be engaged. When the feed motor turns on, that clutch will feed paper, whether the MFPB signals it to or not. It's got a ground, so it will feed.

=^..^=

I concur, do a continuity check on the ground side of the clutch in tray 4 to find out if it's permanently grounded.

[EarthKmTech]

Prcb does not directly control the trays on this engine, the paper feed driver board does. (PWB-KH) and communicates to the PRCB by a flat cable. I have had this fault before where the tray continues to pickup additional sheets on a single page job after the first sheet is fed and then the machine stops with a jam detected at pickup, on this engine and the previous 652 series. It was this board in this instance. (PWB-KH)

[Gift]

Exactly my thoughts blackcat. And exactly why I avoid calling K/M tech support. Always a bad board with them.

[Rikk811]

Sorry for the delay all! And thank you for the feedback!
The problem has been resolved!!! It ended up being the paper feed drive board. When speaking to the agent at Konica, they said that they were looking at the manual and this machine didn't have that board, that's why they suggested the PRCB. I didn't even think to argue with him, and I didn't look at the service manual for it myself like i should've. But all is good to go now, and I know for the next time!
Thanks all!

Sent from my SAMSUNG-SM-G935A using Tapatalk

[blackcat4866]

Congratulations on your success, and thanks for posting back your results. =^..^=

[richwalker]

Prcb does not directly control the trays on this engine, the paper feed driver board does. (PWB-KH) and communicates to the PRCB by a flat cable. I have had this fault before where the tray continues to pickup additional sheets on a single page job after the first sheet is fed and then the machine stops with a jam detected at pickup, on this engine and the previous 652 series. It was this board in this instance. (PWB-KH)

Good day EarthKMTech,

Thanks for this post as I have been going back and forth with a C654e with the same issue. The customer is way out of town and its a government office that is always printing. I have ordered the board and will inform on completion.

Richwalker.