C451 With C2557

[laserman06]

I have a Konica C451 with 4k getting a C2557 (K TCR low density). Replaced the IU, problem went away for a day. Now it is back. Printed out the halftone test chart and it is blotchy. I ran out of time today, so going back tomorrow.

Does anyone have any ideas, how I can watch to see if toner motor is working? Thanks

[Darren King]

I had the same problem with a C352. Try doing a toner add and then run gradation. This helped with in my case.
Hope this helps
Darren.

[JSC]

Check to see if ICP (7) has blown on the printer control board, i have had a few of these go on some of Konica Minolta's previous colour machines.

Good Luck.

[laserman06]

Went back to the account today. I had done some research and finally got to talk to Konica's Tech Support. We boiled it down to the Printer Control Board. Or so I thought. I swapped out the control board, the machine then stabilized. Again I thought good.

Checked my TCR reading and it was 7.09%. Made it through gradation ok. Half tone test pattern was beautiful. Went to run 50 copies and it made about 15 and went into the code again. Went in and checked the TCR reading and it was around 3%.

So now I am beginning to wonder if the K toner supply motor (M14) is taking out the PRCB.

I will look at ICP 7 and see if it blown on both boards. I hope not.

[pepper38_cnd]

Did this happen right after a toner change? If so make sure the shutter on the toner cartrige is opening. If tape is damaged just remove it.

[laserman06]

No toner change involved. The machine is brand new and only has 4K on it.

[laserman06]

Went back today, finally traced it down. Had to replace the whole toner hopper assembly. Working perfectl

[IKy]

I have solved the same problems without any changes several times

[mitchl]

	Quote:			Originally Posted by laserman06
	Went back today, finally traced it down. Had to replace the whole toner hopper assembly. Working perfectl

So replacing the whole assembly took care of the problem............... Inquiring minds want to know what component was bad in the hopper that caused the problem? Good info to have as I haven't had any problems with the new series machines in this regard.

[laserman06]

	Quote:			Originally Posted by mitchl
	So replacing the whole assembly took care of the problem............... Inquiring minds want to know what component was bad in the hopper that caused the problem? Good info to have as I haven't had any problems with the new series machines in this regard.

I wish I knew what it was. My boss said to just replace the whole thing, since it was under warranty. My educated guess would be the toner supply motor on the black toner hopper..

I have quite a few of this series in my territory and they are wonderful machines. All except the Document feeder and C8103 code.

I have found that if you reroute the wire to the lift plate sensor and lube up the lift cam, it helps. Have had to replace a couple of lift motors.