I've been having a wierd banding problem with a C451 (NEC IT45c4). Have swapped the transfer unit, fuser unit, Black IU, print controller, & laser control board (all at NECs sugesstion). I have thought all along that it was the laser (PH) unit, but went with what tech support told me as they were supplying the swap parts.
The problem started with black bands on B/W & color prints/copies at an 8/12 " frequency, but now prints them in multiple colors (rainbow like pattern) all across the page. The original black bands looked like a problem I've seen when ricoh laser units go bad & you get 2 banding patterns (400 & 600 dpi) which makes me think it's the laser on this machine, as they look very similar.
I'll try to attach a sample image. Hopefully it's not too large. It is a 400% enlargement of the original pattern (looks like repetitive brail under a loupe).
I'm hoping one of you guys has seen this or has some idea. I'm not really looking forward to spending $900 on a PH unit without being sure that's the problem.
As always, thanks in advance for any input
The problem started with black bands on B/W & color prints/copies at an 8/12 " frequency, but now prints them in multiple colors (rainbow like pattern) all across the page. The original black bands looked like a problem I've seen when ricoh laser units go bad & you get 2 banding patterns (400 & 600 dpi) which makes me think it's the laser on this machine, as they look very similar.
I'll try to attach a sample image. Hopefully it's not too large. It is a 400% enlargement of the original pattern (looks like repetitive brail under a loupe).
I'm hoping one of you guys has seen this or has some idea. I'm not really looking forward to spending $900 on a PH unit without being sure that's the problem.
As always, thanks in advance for any input
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