Martin,
There is no schematic in the manual for Neriki's nor do Fordray seem willing to
part with a copy at any willing to deliver one at any price. However most
problems are easy to s solve as the unit is quite simple.
What are the symptoms?
I own 2, and other than having one resistor change from 47 y
to ~ 120 ohms, shifting colours, theyve worked fine since 1988.
Bob Quintal Montreal Canada