HP 97 latest PCB with blown capacitor : Alive !

[teenix]

(12-13-2020 08:34 PM)Chr Yoko Wrote:  - Works on power coming from a bench power supply @4,8V and 1A limitation connected to the battery connectors with crocodiles (need be carefull about the + / - orientation !!).

- The Printer is very slow/sluggish to move paper and lines overlaping : maybe i need to check its mechanical parts/wheels.

1A supply is probably not enough to drive the printer properly. Each print head element draws around 0.5A and there will most likely be more than one active while printing, and then there is the motor current and calculator CPU etc.

I used one of these...

https://www.jaycar.com.au/5v-dc-3a-slim-...s/p/MP3480

cheers

Tony