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teenix · (This post was last modified: 10-22-2019 03:05 AM by teenix.)

(10-20-2019 01:55 PM)albertofenini Wrote: The Keyboard PCB : we need to find a replacement for the M624 3-393 any idea on that ?

Also on this we will need to replace the RCA chip as two segments in each of the leds are not working

I'm not sure of the transistor specs or what type the transistor you refer to in the circuit(PNP or NPN), but maybe a BC337 NPN, and BC327 PNP or similar, 2N2222A, PN100, 2N3906 etc.

If you have a mutimeter with a transistor function you might be able to find gain (hFE) details etc and find a similar item.

Are the chip solder connections and pcb tracks from chip to leds ok for these segments.

cheers

Tony