747 injector drivers

[Ludis Langens]

The Punisher wrote:
> 
> I removed some components from an old dammaged 747 ECU today. They were the
> 4 that are on the side connected to the heat sink. They all have different
> numbers but all have "BCEK" at the bottom. They are 3 terminal TO-220 case
> style.
> I am assuming that they are the injector drivers. Does anybody have any info
> on these?

Two injector driver transistors, two power supply transistors.  Check
this schematic:
  http://www.cruzers.com/~ludis/schematics.html#1228746

(The 7747 and 8746 use the same PCB.)

The BCEK are the pin labels: Base, Collector, Emitter, and I don't know
what the K refers to.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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