The printed circuits are constructed using a thin copper layer that is bonded
to a plastic sheet – on both sides in some cases. The required circuit is then
printed on to the copper using a material similar to wax. The unwanted copper
can then be etched away with an acid wash. A further layer of thin plastic sheet
can insulate the copper strips if required.
Figure 3.12 shows a picture of a typical printed circuit from an instrument
panel and gives some indication as to how many wires would be required
to do the same job. Connection to the main harness is by one or more
multiplugs.
3.2.5 Fuses and circuit break ...
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