Fortunately these, like all EM calculators, are very forward in their workings.
There are two machines here. You have a 1968 certified CPM calculator. And an electrically triggered lock vault.
You have the basic set of ICs for mathematical function. Everything beyond those ICs is purely getting the correct energy to the correct spot at the correct frequency, and in the correct offset for spikes.
Head over to good will or savers, Salvation Army. Etc. Find a 99 cent - $1.99 old fashioned can opener or the like. Low end mechanical kitchen appliances. Look for the closest you can get to the correct wattage and buy that appliance. (Test it for free while there first, obviously. Just needs to turn on/power up, not work) Steel the transformer from it and swap it out.
I don’t SEE any blown caps in the photos. So the transformer is my first point to look at.
Sill not working? Any chance you have a wall or under stove convection oven that has a keep warm function? Good
Remove the boards from the casing
Turn on the oven to 250• and wait 10 minutes or so
Now Set the oven to keep warm and open the door. Wait a few minutes (3-5) to let it both cool off to the keep warm temp. Doing this in this order is vital. Place the boards on the bare track with a steel cookie sheet on the rack below it. Partly close the door to the mid-way point. After 30 minutes gently take her boards out and let cool go an hour! Do NOT drop or bang them! That’s typically warm enough to SOFTEN the solder back around pins without melting/burning anything g. The cooling time helps keep tight seals without gaps from air or shrinkage.
Put it back together and try again.
_________________ 42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D
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