Seiko Group TM-L60 - Manual (Page 26)

d) If thermal paper touches anything which includes phthalic acid ester
plasticizer for a long period, it can reduce the image formation ability of the
paper and can cause the printed image to fade. When storing thermal
paper in a card case or sample notebook, be sure to use only products
made from polyethylene, polypropylene, or polyester.
e) If thermal paper touches diazo copy paper immediately after copying, the
printed surface may discolor.
f) Thermal paper must not be stored with the printed surfaces against each
other because the printing may be transferred between the surfaces.
g) If the surface of thermal paper is scratched with a nail or other hard metal
object, it may discolor.
(2) Notes on thermal paper storage
Color development begins at 70°C, so the following precautions should be
taken.
a) Store paper away from high temperature and humidity.
Do not store thermal paper near a heater or in direct sunlight.
b) Avoid direct light.
If exposed to direct light for a while, paper color may change or printed
images may fade.
5-4 Error Correction
n ERROR LED (red)
On: If this LED lights when the near-end LED is off, it means the printer cover is
not closed.
If this LED lights the near-end LED is on, it means the printer went OFF-LINE
after detecting a paper near-end.
Off: Normal mode.
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