IBM Terminal Monitor Reverse Engineering

I have now started the hopefully not too long process of figuring out as much as I can about this monitor and its cable pin-out. I began by taking off the main board:

I discharged the HV anode just to make sure even though it had not been powered for a month at least. The circuit board had a different layout than the 5151 had, but it did have similar critical parts such as the 7406 which connects to many of the video input signals.

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  M11

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  m12

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  M10

It took about 3-4 hours of probing with my multimeter and comparing to the 5151 schematics, but in the end I finally had a full pinout of the monitor.

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  Monitor Testing_edited

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  Monitor Testing 2_edited

Luckily, the monitor only requires 15V and 5V power, and in the 5151 manitor they were both generated from a 15V 1A source so it should not be very complicated to get working!