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stephen_usher's latest activity
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Sstephen_usher replied to the thread Kaypro 4: Boschert XL53-3601R PSU: Trying to find replacement switching transistor (Q1).Thanks.
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Sstephen_usher replied to the thread Kaypro 4: Boschert XL53-3601R PSU: Trying to find replacement switching transistor (Q1).That's actually a generic Boschert PSU from 1979 and doesn't actually match the XL53 from 1983. I've looked into this previously.
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Sstephen_usher replied to the thread Kaypro 4: Boschert XL53-3601R PSU: Trying to find replacement switching transistor (Q1).Well, I guessed that it was a 2N2222A as that generally fits the frequency range and probable voltages but that changed nothing. I'm...
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Sstephen_usher posted the thread Kaypro 4: Boschert XL53-3601R PSU: Trying to find replacement switching transistor (Q1) in CP/M and MP/M.When the main RIFA delayed smoke generator popped on the Kaypro 4 power supply (Boschert XL53-3601R) it took out the switching...