hi try replace the thyristors with a 1n4007 diode if you get dc out put then with a scope check the dc op is bridge op wave form and check the op wave from the pc is ok
i think the ic is a opamp ie quad 741
good luck
unimog
i do not know of a scottish courror that will not accept card payment how big is this i can suggest courours that can help you cheapest is to use local rates better than national
tks
hi
try google the numbers youwill find a equvent as long volts and current are same or higher you should be ok check the drive is ok to thease divices if it wlii not work
tks