Sharp PC-1211/TRS-80 PC-1 Software

[Dave Britten]

(08-18-2021 08:16 PM)mikesuch Wrote:  Thanks Dave!
I actually figured it out, not sure it will help alot of folks but it turns out the board for the cassette interface is bad. I bought a different interface from the bay and tried it and it's working. Now I debate trying to figure out what electrical component isn't good. It prints and csaves ok but cload just won't work on the old one. It's a TRS-PC3 Printer/Cassette interface, was looking for service guides but no luck. I'm pretty good soldering, not so good debugging electrical circuits. if anyone has any ideas on what component it might be (hopefully just a simple diode or resistor) I could bring it back to life .

Huh, interesting! I'd test it with a known good cassette recorder or amplifier before writing it off as broken - it's possible that manufacturing differences or differently aging components could be to blame for slightly reduced sensitivity. I am no circuit expert either, so I can't give any suggestions on components to check. When in doubt, recap it.