SWITCHES, Rotary Disc, 2-Pole No. C1 ZA/CAN 4207
The full name for this switch is, SWITCHES, Rotary Disc, 2-Pole, 4-Position, 3-Bank, No. C1 ZA/CAN 4207 and its circuit reference in the 52-Set receiver is S2A. It is the ‘Mode of Operation’ Switch located in the extreme lower left front of the receiver.
This switch sits very low in the chassis, which in the case of this receiver was its undoing. Somebody put the receiver down on a workbench, or other surface, at one point without checking to be sure the surface was clear. The result, if you look closely, is that the middle switch contact wafer was shattered.
These switches are designed to be repairable and a large surviving chunk of the 2nd to 4th Echelon Maintenance Manual is devoted in detail on how to do just that. However, one needs spare wafers in order to affect those repairs and the work required is substantial. Hence, this receiver became my parts receiver.
David
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