[ischmitz]

Dennis,

the raised resistors are Bosch's way to fine-tune each individual unit. This is true for CDI ignition boxes and ECUs. The raised resistor is ususally in parallel to a base resistor and 5 to 10 times higher. So it slightly reduces the overall value of the base resistor.

Unfortunately, all the boxes I had so far always were empty in that area. So I don't have any reference for you. And even if I had one the value is not the same from box to box so a value would be of little help to you. My educated guess is that the 300 area used to be a traditional linear voltage regulator based on a Zener diode. As such the raised resistor was most likley used to trim the +5V to its exact value. If your +5V supply is spot-in don't worry about it. Measure it with an accurate DVM to be sure. It should be within the tolerances (+-4%) of a modern LM7805 regulator. If you measure between 4.8V to 5.2V you are fine.

Ingo