Is there a consolidated set of repair information?

[teenix]

Hopefully nothing much for the majority of them but a bit of corrosion, even the lubricating goo under the power switch sometimes hardens and may limit power flow. Maybe just a bit of wiggling on the circuit boards might clear some corrosion up on the pins that connect the boards together. I've come across this in the past.

Unfortunately this all means opening them up, and trying to preserve the quality of the back label is an extra task to do. Warming the label with a hairdryer can help soften the glue. It only needs the top corners peeled enough to expose the screws - which, if you like, can be left out to keep the label in tact for future repairs.

Some of the capacitors may have deteriorated with lack of use over the years.

Check here for Tony Duels calculator circuits.

These might help you check the power supply voltages if you have access to a multimeter, although a scope is a better tool if you get access to one.

cheers

Tony