Does the schiller at1 have one channel capabilities and if so, does it use smaller paper?

Check the leads. If any of the Leads is open the this problem can occur. You have to check the continuity of each cable for the lead end to socket. All leads should show a resistance of 10KOhm
If you wish to get some details About schiller AT1; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

The Schiller AT1 is a battery powered unit. A common symptom of weak/defective battery's is that it will stop printing after 1-2 seconds of run. As to whether the patient cable effects this, I honestly don't know, It really shouldn't, baring some very weird internal short in the cable. The battery in the AT1 is beyond the average user to safely replace. Before anything else insure that the AC indicator light illuminates when the unit is plugged in. If not, you device might have a defective power supply. In either case, the unit needs repair in a Qualified shop.

hi,
check the battery of your your ecg machine. if the buttery backup is not good this problem can occur.
also try to clean the paper sensor .
ok

hi,
use only paper for schiller AT1 . also check the paper sensor. slide the paper cover then look at is printer head side , u can see a small black square portion in the side . clan it with an ear bud. do not use any solution. after cleaning put the paper back and test again. use paper with black spot on the side. machine counts the black spot.
ok

hi,
u can make it single channel one by changing its setup. it will print single trace in the same paper. when u select this option it use more paper than the three trace.
ok

hi
the most common complaint with AT1. replace the battery. 12v 1.2ah or (1.3ah)
ok

hi,
replase the battery or ur ecg machine. is a regular complaint with AT1.
OK

I have the manual for the ECG AT-1 Schiller. I can sell it to you for $20.00 usd. you can send me a money order or pay it by paypal. Let me know if you are still interested in buy it
[email protected]
www.biomedtechpr.com

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

You need a new battery. Contact R& D Battries