Konica 7272 - Exposure lamp lights permanently, no subscan direction

[Laserbeam]

Hi all,

Konica 7272 shows sometimes following error. After pressing the start button, the exposure lamp lights permanently. The scanner does not start in sub-scanning direction. This condition can only be stopped by pressing the power or sub-power switch. Then the machine is working again normally.

Following parts I had replaced:

Exposure lamp with starter-unit

Ram-Memory 128 MB

but unfortunately without success!

Any ideas?

[blaze2000]

Re: Konica 7272 - Exposure lamp lights permanently, no subscan direction

Try disconnecting the doc feeder and see if that changes anything. If not. then I would start thinking main control board

[Laserbeam]

Re: Konica 7272 - Exposure lamp lights permanently, no subscan direction

If you copy from the original-glas without doc feeder, this error occurs too.

[JustManuals]

Re: Konica 7272 - Exposure lamp lights permanently, no subscan direction

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[blaze2000]

Re: Konica 7272 - Exposure lamp lights permanently, no subscan direction

OK, I was thinking this doc feeder was optional but it is standard. Almost sounds like it is wanting to stream-read off the slit glass... where is the lamp when it lights up? Also it may not be reading the home position. Clean the optics, white plate, and HPS. It sure is sounding like a board issue brother.

[blackcat4866]

Re: Konica 7272 - Exposure lamp lights permanently, no subscan direction

On the analog Canon's with fluorescent exposure lamps you would get this exact situation if the exposure lamp was not lighting bright enough or quick enough. A piece of paper is left at the registration rollers, but does not always show as a jam.

On the Canon NP-6016 the cause was either the exposure lamp, lamp heater, or lamp inverter. Does the lamp flicker? Possibly a bad lamp harness? Is there some sort of lamp intensity sensor on light source #1 or does the CCD read the lamp intensity?

It sounds like you're on the right track. =^..^=

[Laserbeam]