BLOWERS, Electric, 4-Blade, No. C1 ZA/CAN 4411
I am not sure how large of a sub title these individual posts can handle, so I will start by providing the full description ID of this part as follows:
BLOWERS, Electric, 4-Blade, 3-inch, 12 V, 1.2 Amp No. C1 ZA/CAN 4411
One each of these are located in the upper panels of the Supply Unit and Sender of the Wireless Set No. 52. They are thermistor controlled, only coming on when the internal compartment temperature rises to a preset point, either from excess ambient air temperature, or excessive dynamotor operation. I suspect they are set up as exhaust fans, but that has yet to be confirmed.
While I was in the mood to explore the fan in the Sender more closely, I hauled out the trusty warm soap water and toothbrush to clean off the grime on part of the rear of the fan assembly. I deferred use of any chemicals as the two horizontal electrical components seen lashed to the rear of the fan motor looked very much like wax coated capacitors. I was 50% correct. The forward one was indeed a .1 microfarad 500 Volt cap, C3AF in the schematics. The rear cylinder, on the other hand, turned out to be the small R.F. Choke (L30B) to suppress noise from the fan motor and it was tucked neatly into a small plastic tube.
While not yet a comprehensive cleaning, it did confirm a pair of CMC inspection stamps on the back of the fan door assembly, and another pair on the rear face of the lower phenolic resin board on the lower half of the motor, The name “REDMOND” also showed up stamped on the back of the motor case, just below the rear bearing cap assembly.
David
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