The TS-5210 user manual dedicates three pages to paper loading for a reason. The rear tray (as opposed to a cassette) is finicky.
A legacy industrial device that converts temperature readings into air pressure signals for controllers. Corder TS-5210 Power Adapter User Manual ts-5210 user manual
Do not power off during firmware update. The user manual warns this permanently bricks the mainboard. The TS-5210 user manual dedicates three pages to