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The machine does not work.  There is no visible reaction on power-on.

Only a few times during testing it showed all zero’s or all one’s.  This was repeatable until I left it off for a few hours.  It then never came back again.

The machine is built of a power supply and five logic boards.  

Tests following the guidelines in the service documentation reveal an error on PCB4. The sevice documentation suggests replacement of a PCB which fails the test. Many electronic components are early IC’s each containing a few logic elements. Board repair is supported in the service documentation, but schematics are not available and parts are probably difficult  to find.

Below photo’s of the 5 PCB’s.  They are numbered 1 to 5, where 5 is the lowest board.

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PCB-1

PCB-2

PCB-3

PCB-4

PCB-5