Hey dont worry Ricoh Dicoh we have all been there.

The best advice I think I can give you is to spend as much time and yes possibly it will be your spare time to work on old units.
The quicker you can strip down and rebulid a unit the more time to think about the problem and of course in some cases get out of the customers!

If you don't already get a 5.5 mm magentic socket driver it will save you lots of time and hassle if working on Ricoh Kit.

As your totally new to the business learn as best you can to read the SMC sheets, customers dont always tell you the facts either for their benefit or because they simply are mistaken. But also give them the benefit of the doubt as very very very occasionally the SMC sheets dont register a code for some reason.

It will get much easier trust me