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+--- Thread: Need help - AC Adapter for RS 26-3591 (/thread-22170.html)
Need help - AC Adapter for RS 26-3591 - JoeG - 08-13-2024 11:33 PM
I recently acquired a SHARP PC-3 that came with a Radio Shack 26-3591 Printer/Cassette Interface. What I'm missing is the AC Adapter that provides power to the interface and the PC-3. I did find the following information on the internet for this unit:
https://collection.motat.nz/objects/126034/pocket-computer-and-printer-trs-80-pc3
Specifically, this section seems to imply that the needed AC Adapter is a "CASIO / AD - 4145 / A.C. ADAPTER", but a U.S. power version.
This AC Adapter from Amazon is available:
https://www.amazon.com/CASIO-AD-K45-4-5V-Power-Supply/dp/B06XNMM9SM
Description: UpBright AC/DC Adapter Compatible with CASIO AD-K45 ADK45 Pocket TV Receiver Portable Display Mini Memory Electronic Calculator AD-4145 AD4145 4.5V 4.5VDC 300mA 400mA DC4.5V 0.4A Power Supply Charger
On the back of the printer/cassette interface, the specifications show "4.8V 2.5W".
Is it safe to "assume" that the aforementioned AC Adapter available from Amazon would be a good match for the RS 26-3591?
Also, does anyone know of a downloadable source for the "TRS-80 PC-3 Printer/Cassette Interface" manual? I haven't been able to find one. I might have to by an actual manual on ebay.
Thank you!
Joe
RE: Need help - AC Adapter for RS 26-3591 - Ren - 08-15-2024 08:35 PM
Can you solder?
I have no idea if the barrel (power) connector of the Amazon power supply will fit your printer, but a proper size one could be soldered on.
The 4.8 volt or 5 amp output of the Amazon power supply should not be a problem. The printer will hopefully draw only the amperage it needs. As it has AC output, (I couldn't really tell even when I enlarged the Amazon photo), polarity of the barrel connector shouldn't matter. 2.4 W / 4.8 V = 0.5 Amp, so the power supply could provide 10x the power the printer is slated to draw. That would be a consideration if the printer has a defect causing it draw far more than the slated current. (i.e smoke!)
Written from ~40 years experience as an Electronic Tech.
RE: Need help - AC Adapter for RS 26-3591 - JoeG - 08-15-2024 10:24 PM
Thank you for the reply!
Yes, I can solder.
I have decided to order a CASIO AD-4145 A.C. ADAPTER based on the reference link I had posted. I'll test it with my multimeter before I connect it to anything. I also ordered a manual for the printer/cassette interface. Hopefully it has some helpful information within it as well. I'll wait for that to arrive before I connect the adapter.
When I have time, I'll scan the manual and post it to several sites for those looking for a copy in the future. I never found a PDF copy.
Thank you!
Joe
RE: Need help - AC Adapter for RS 26-3591 - JoeG - 08-20-2024 06:32 PM
As hoped, it turns out that the CASIO AD-4145 A.C. ADAPTER was the correct one to use. I still had to replace the two CR2032 batteries in the PC-3, but it works great!
Joe