Thanks for the quick reply.
I'll try to follow the advice you gave me.
Thank you from the bottom of my heart.
As advised, I replaced the lamps and cleaned each one.
The first problem was solved, but now I had a new problem.
I am using ColorQuartet 5.2.2 with Windows 7.
When I run a preview scan on the CQ.
SM11000 is running and the lamp is glowing.
However, within a second, the lamp goes out and the drum rotates for a while.
Error message "Error.no 1473 Could not read from scanner" is displayed.
The same decrease occurs when I run Color Trio.
Both stop after 3% of the scan.
It is the same for both transmission and reflector.
In CQscan, the number of the drum is displayed.
It seems that the drum is recognized.
And to make matters worse, the preview scan completes successfully about once every 20 times.
However, when I try to scan, the light comes on for a second and fails again.
From what I've seen in the past, it seems that by turning off the scanner only, I can get it to work.
However, the same method does not solve the problem.
Are there any possible causes or things I should try?
I just got it a month ago, and there are so many things I don't understand that I almost gave up many times.
Every time I look at the scanned image before the trouble started, I get myself up to do something about it.
Please let me borrow your wisdom.