UNITS, Crystal Calibrator, No. C1 ZA/CAN 4286
As per the attached illustration from the 52-Set Master Parts List, the Crystal Calibrator in the receiver is serviced as a complete unit. In reality, it is made up of three sub-components, from back to front: the calibrator chassis, the extension assembly that gets the calibrator panel far enough forward to line up with the upper front panel of the receiver, and the calibrator panel assembly itself that includes the switch and indicator lamp.
When installed in its location in the upper left corner of the rear chassis wall of the receiver, there is only a ¾-inch clearance between the side of the calibrator assembly and the left side wall of the receiver chassis and the front of this receiver side wall bends inward ¾-inch to support the upper front panel of the receiver when it is in place. Two slotted round head screws and external lock washer sets secure either end of the calibrator to the rear chassis wall of the receiver.
I suspect that the assembly line station where the crystal calibrator was installed into the receiver chassis was equipped with an overhead, flex cable driver rig similar to a dental drill. It probably had an angle head with interchangeable bits and would have worked easily to mount the calibrator quickly. Once mounted, three leads on the right side of the calibrator chassis would have been soldered in place: HT, 12 Volt and OUTPUT, and the e installation would be done.
However, to remove the crystal calibrator from the receiver, one first has to remove a pair of slotted, round head screws and external lock washers on the bottom side of the union between the calibrator chassis and the extension assembly, and a pair of slotted, pan head screws only at the top union. The loose section of the calibrator can then be swung to the right side enough to get a ¼-drive socket and extension in place with a slotted driver head to undo the four screws mounting the calibrator chassis to the receiver.
Best to unsolder the three leads to the calibrator first, however,
The innards of this calibrator are quite similar to the one designed for the Wire Set No. 19.
David
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