On some of the older lasers, I've been able to crack them apart and clean and lube the polygon mirror motor. I used to use silicon spray oil or standard lube, then when I got into some older lasers, it wouldn't fix it anymore. So I switched to EZ-1 synth lube, and that got it. I imagine any brand of synthetic of a very light weight would work.
Also, tip for ROOKIES:
The biggest mistake I see rookies making is either not learning, or not remembering the three "I's" of technical troubleshooting.
1. IDENTIFY....see blackcat's post. Listen, think, observe, ask questions, make SURE you know exactly WHAT the problem is! (most get this first one). ALSO, look for other problems, the customer is not the tech. and can not see things you can with a trained eye.
2. ISOLATE.... this is where many new tech's get stuck. They don't know how to go about isolating subassemblies, removing options, etc. to find out where the problem truly originates. A read-through of the service manual should be required for each model worked on. You can't easily fix things unless you have an understanding of HOW THEY WORK.
3. INITIATE.....after 1 and 2 are complete. Sometimes concurrent with #2, but almost NEVER with #1. Also includes thorough testing of the machine's functions when you think you're done. If I had a nickel for every time I've said, "glad I checked that BEFORE I left" I'd have a drum full of nickels.
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