I have a Phillips PM3264 100MHz 4 channel analogue oscilloscope, I have not powered it up in around 8 years. I have not been able to find a users manual, nor service manual as of yet, only a few pages of specifications from a brochure [pdf].
I am concerned that due to the time it has spent in storage, and the overall age of the oscilloscope that merely plugging it into mains and turning it on may not be the wisest plan of action. There do appear to be reports that the line filtering circuit can be problematic on these oscilloscopes.
If it is of any importance we have a mains ground circuit breaker (I was honestly shocked to discover that in some areas of the world it is not a legal requirement), and I do not have a variac (even so, I'm not sure that a variac would be the best idea at all). Mains power in the area is 240v at 50Hz, 240v is right at the upper end of the oscilloscopes power supply voltage range. I do not have probes for it at current, and I would prefer to at least get an idea as to whether it is still functional prior to purchasing probes given budget constraints, and location.
So, are there any precautions I can take when powering it up to prevent damage to the oscilloscope?