Where could I get a Small cheap external printer for schiller aed/ecg machine. Mine doesn't have one. One preferably that can plug into a usb port

The battery is faulty. You have to replace the battery.
If you wish to get some details about Schiller ECG machine repair then check the following link.
http://electro-medical.blogspot.com/

HI,
Its a common problem with Schiller ECG machine. The battery of your ECG machine is faulty. Even if you are using the machine in AC it uses the battery power. The AC power is only used for charging the battery.

When the machine starts to print the battery will drop down and the printing will stop. This is happening with the machine. It will eject the first paper without printing. its normal. Because the machine starts printing on a fresh page only. In your case the machine is ejecting the first paper. When the machine starts its printing in the second page it will draw a large amount of current from the battery for its thermal printing head. If the battery is not proper then it will suddenly drop the printing. The square box you see is not printed by your ECG machine. Its already printed in the paper of Schiller. With this mark the Machine sense the page.

Its a 12 volt 2.3 AH battery. You will not be able to replace the battery from out side any where. For replacing the same you have to open the machine by removing the screws on its bottom. Be care full with the paper tray while removing the top cover. Also do not use any force to open the top cover because there are connections on the top cover.
Here i have added a link to the battery for Schiller AT2 PLUS

Battery


Ajin

hi,
Your machines thermal printing head have some problem. Thats why it give printouts very light. Not possible to repair thermal head. You have to replace it.
ok

hi,
it has single channel capability. but will use the same paper for printout. can't use any small paper.
ok

HI,
check the paper u have inserted. it should be Schiller original paper with page marking. also clean the paper sensor. u can see the paper sensor near the side of printing head. a small square portion. clean it with an ear bud, don't use any solution for cleaning only ear bud.
ok

HI,
check the paper u have inserted. it should be Schiller original paper with page marking. also clean the paper sensor. u can see the paper sensor near the side of printing head. a small square portion. clean it with an ear bud, don't use any solution for cleaning only ear bud.
ok

I have a problem with ECG Schiller AT-1. In auto mode, it prints nothing but in manual mode it works properly. Could you help me solve this problem

Does it work in auto mode ? are you putting paper correctly means , there is a black mark on paper which is sensed by paper sensor .If you put paper up side down then paper sensor won't be able to sense any paper & gives you error for rifilling paper .If this doesn't help you then You need to replace battrey . Thanks

Most likely needs a new battery. Can be ordered from R&D batteries.

Turn on machine, wait a few seconds then press ALT-0-1-1

You will get a print out showing all the settings