Hello and HELP! (please.......)

[pronicd]

Hi, new here, so please be gentle with me!
I have just put a new drum and scraper blade in a Nashuatec 3913 photocopier.

I assume that there must be some adjustments needed as even plain copies are coming out grey across almost the whole page.

Any help or advice would be very much appreciated.
Thanks in advance for any help anyone can give.....

Cheers Russell F

[Aneurysm]

Welcome to the site.

[RRodgers]

Are you sure the blade is touching the drum? Are you sure you didn't get any sensors around the drum dirty? Are you sure you put the charge corona back in properly.

[pronicd]

Hi thanks for your insight. I just slid the whole assembly out, and was horrified to see that the scraper blade was no longer pointing down! It had bent back on itself and was pointing up instead!
It was definitely pointing downwards when it was fitted, so am puzzled as to why it has done this.
Any thoughts as to why this may have happened and how to ensure it doesn't do it again?

Thanks in advance, Russell F

[mrwho]

Hi thanks for your insight. I just slid the whole assembly out, and was horrified to see that the scraper blade was no longer pointing down! It had bent back on itself and was pointing up instead!
It was definitely pointing downwards when it was fitted, so am puzzled as to why it has done this.
Any thoughts as to why this may have happened and how to ensure it doesn't do it again?

Thanks in advance, Russell F

The blade adhered to the drum and flipped (known, not surprisingly, as blade flipping). When putting a new drum and blade you should always put some toner on the drum and blade (although not on some equipments) or, preferably, use setting powder (a toner-like substance that comes inside cloth bags - you just gently tap the bag onto the drum and blade and the setting powder comes out through the cloth's fibers onto the drum and blade). The toner/setting powder acts as a lubricant and prevents the new blade from adhering to the drum.

If you want to check the blade adherence by yourself, just grab the old drum and blade, clean them thoroughly with some cleaning product and, after they're dry, try to drag the blade along the drum and you'll see they tend to stick together.

[pronicd]

Hi guys, yup that was it for sure.
Have now put it back in (just before I got the reply about the blade flipping).
Seems to be working fine now.
However Mr clumsy has managed to break off one of the little plastic locating pegs at one end of the scraper assembly.
Not an issue - fortunately!

This time around, apart from the fact that there was toner left on the drum (which I did not clean off) I put the scaper blade on before dropping the drum in.
Last time I put the drum in first and then the scraper.
Is there a preferred re-assembly sequence, or is it probably just the lack of toner or powder that caused the problem?

Cheers Russell F

[pronicd]

p.s. I love your avatar Mr Who? Fantabulous!

[pronicd]

I was just looking and found the service manual forum.
Realise from the rules that I have to have five posts before being able to ask for a manual.
Fair enough (does that mean five posts under one thread, or five threads on wonders?).
However I do have a full manual for a Canon NP 62-16 if anyone needs one.

Cheers Russell F

[blackcat4866]

Is there a preferred re-assembly sequence, or is it probably just the lack of toner or powder that caused the problem?

Cheers Russell F

The blade usually comes dusted with a very small amount of setting powder, and sometimes the drum too, but it's rarely enough. You should always rotate the drum through a couple full rotations in the feed direction to make sure that blade won't flip.

There are only two situations I am aware of, of drum blade flipping, if the blade survives initial installation:
1) On Sharp Panthers it was not uncommon to flip the blade within the first thousand copies. If it survived 1000, it would last a normal life.
2) In situations where the customer runs extremely low coverage (1%) the blade can start to hum or keen because of minimal toner usage. You see, toner acts as a lubricant to prevent the blade from vibrating, grabbing and finally flipping. Too little lubricant, and ... you get the idea.

I'm sure that it's more than you wanted to know. =^..^=

[pronicd]

LOL - no not at all! I like a detailed analysis!!