Red Streaks on scanning

I have a old Umax Astra 600s. I cleaned the glass by taking the top
off and light wiped the light bar. I can san small white like
business card but scanning large colored images I get bars of red
streak down the image right in the middle, top to bottom?

<James@James.ca> wrote in message
news:fgkkk3dj0til8jl4k9b75dceenv6tiipr4@4ax.com...
>I have a old Umax Astra 600s. I cleaned the glass by taking the top
> off and light wiped the light bar. I can san small white like
> business card but scanning large colored images I get bars of red
> streak down the image right in the middle, top to bottom?

You probably need to clean the mirrors, lens, filter and any other parts in
the light path.
Probably have to disassemble the scanner to get to the mirrors and lens.

This site is on cleaning a Canon 8400F scanner, the Umax may have some of
the same parts.Screws are likely in different places.
http://www.carlmcmillan.com/CanonScanner/Canon.htm

--
CSM1
http://www.carlmcmillan.com
--

Narrow streaks that run the length of the scan are typically the
result of dust or other contaminants at the sensor (or very near to
it). The link in the previous post sounds like a good place to
start. Do be very careful if you get to cleaning surfaces near the
actual sensor, as it is very easy to have an electro-static dischage
(ESD) event which can fry the electronics.

On Nov 26, 8:46 am, "CSM1" <nom...@nomoremail.com> wrote:
> <Ja...@James.ca> wrote in message
>
> news:fgkkk3dj0til8jl4k9b75dceenv6tiipr4@4ax.com...
>
> >I have a old Umax Astra 600s. I cleaned the glass by taking the top
> > off and light wiped the light bar. I can san small white like
> > business card but scanning large colored images I get bars of red
> > streak down the image right in the middle, top to bottom?
>
> You probably need to clean the mirrors, lens, filter and any other parts in
> the light path.
> Probably have to disassemble the scanner to get to the mirrors and lens.
>
> This site is on cleaning a Canon 8400F scanner, the Umax may have some of
> the same parts.Screws are likely in different places.http://www.carlmcmillan.com/CanonScanner/Canon.htm
>
> --
> CSM1http://www.carlmcmillan.com
> --

A little update, I read the cannon scanner instructions and opened the
old Umax which was similar but no cigar as Guocho would say. The
mirrors, sensor look fine and even after cleaning just the same
results streaking top to bottom in 20% of the middle?

We tried.

<James@James.ca> wrote in message
news:0kbnk39mheapf2pvp5e7l0fkohrur1rlnd@4ax.com...
>A little update, I read the cannon scanner instructions and opened the
> old Umax which was similar but no cigar as Guocho would say. The
> mirrors, sensor look fine and even after cleaning just the same
> results streaking top to bottom in 20% of the middle?
>
> We tried.

This sounds exactly like what I was getting years ago when I did some
serious mods to an Agfa Studiostar.
I was until I got the light and optic path properly aligned that it was OK,
so dont give up yet and see if you can detect wether something has shifted
out of alignment... did it recieve a heavy knock?

hth
Mark