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Rank Xerox TC I, II and III Service Test Box

This  was manufactured by Magnavox, not Xerox. It was used to test all the Magnavox machines. It plugged into the machine via a multi-plug and performed several functions:
Firstly, it was a selectable tone generator. By activating the knobs, with the machine in Receive mode, the machine could be started and stopped and bands of different shades, from white to black, printed out.
This enabled the two print heads to be also set for penetration and interlace. With the machine in Send mode, and a test chart inserted, the output signals could be measured on a multi-meter, plugged into the test box, and also listened to on an earpiece.
The patch-plain, to the right of the knobs, enabled various points in the machine's circuitry to be measured, or looped together for elimination testing, with the selection of the jumper wires supplied.

Our Service Test Box is "probably the last existing test box around" and was kindly donated by Jeremy Wilcox.
Serial No: 600190450

Date : 1990

Manufacturer : Xerox

This exhibit has a reference ID of CH6458. Please quote this reference ID in any communication with the Centre for Computing History.

Scan of Document: Rank Xerox TC I, II and III Service Test Box

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