MP-4500

[T911]

sc 322 synch problem on this one. cleaned laser unit and made sp 2- adjustments for 400 and 600dpi but no luck. is the diode bad or the sbcu on the front of the laser the commonality here. thanks t

[ZeusGT]

Was there a toner spill or dusting problem?
Usually if your getting that error, then there is a little board in the back of the laser unit that goes bad... First, make sure that all the glass in the laser unit is cleaned and there is no obstruction along the laser path. If all fails then it may be that board.

[FMC]

It can also be the drum.If its near 150K change it.You may also be geting alot of SC990 aswell.

[T911]

there was a toner spill and the little board at the back was cleaned but not replaced. the drum has about 80k. i'll check on those parts. thanks t

[Radman]

Had the same problem a week ago I replaced the pitch hight sensor on the lazer unit did 400&600 pitch ajustment and walla

hope this helps

[ZeusGT]

Don't forget that the front door switches can also cause this problem...

[TonerMunkeh]

	Quote:			Originally Posted by T911
	there was a toner spill and the little board at the back was cleaned but not replaced. the drum has about 80k. i'll check on those parts. thanks t

If the LD detector board has been covered in toner, it's had it. Replaced the LD detector unit and laser emitter, sorted.

[T911]

can someone kindly provide me with Part #s. Is this unit the same as any others. 1045/2045 are different but how about some of the older ones like the 350/450. thanks t

[Ricoh-ono]

I had a bad spill on a 3035 that killed the laser. After one laser unit and a couple hours of cleaning the machine started working again.

Start with ZeusGT's advice and inspect the door switches near the fusing unit. Then look at replacing laser parts.

Here are some part numbers.
Laser Unit - B298 1870

Laser Diode - B298 1891
Laser Sync Detector - B213 5320
Polygon Motor - AX06 0303

[T911]

much appreciated guys. thanks