Hi Bob,
I bought two Q20's a couple of years ago,
one came from a firm in London, sold on ebay as dead,
I got it for £70.00 all in! The startup resistor in the
power supply was open circuit!
The second one came from the states with the fault
no display, it cost £100 with all the import duty etc.
It arrived, I plugged it in and turned up the contrast!
all o.k.!