When as ISCU fails is there a normal or typical failure mode? They are basically a box full of resistors, capacitors, transistors and a couple of chips.
The only thing I have managed to find on a US website was a comment about changing the "usual" failed transistor that overheats and the 56 ohms resistor that overheats ???? Thing is, to properly check whether the components have failed you need to take them off the board and I don't want to take 7 transistors off, plus who knows how many resistors on a trial and error basis. Shouldn't be rocket science to fix, but like anything determining what needs fixing is the big problem!
you could look up "how transistors work" [or something similar] .For a transistor to conduct [work] it will need something like 0.7volt between the base and emitter,but you really need a working ISCU to compare voltages.
good luck.
I dont think, so I'm not[do I exist?]
1992 1600td [ jx ] syncro panel van[leisuredrive camper ]
Fixed my ISCU with a new Power Transistor (there are 2 BD438 Transistors on the board, I had 2 ISCUs which were both knackered, so I took all 4 Transistors off, measured them and put the 2 good ones onto one board, but you can get the bit for about 35p, I just couldn't be bothered to wait for a delivery from RS components!!!)
Hope that bit of info helps others with dead ISCU's
