Rev.B Overview of the Mechanisms Appendix B-5
TM-L90 Service Manual
Confidential
Paper Supply Unit
The paper supply unit consists of the label holder, paper detection LED, NE detector, and hinge
cover.
The label guide is attached to the label holder and interlocks with the cover unit. This allows the
TM-L90 to receive paper roll in the correct position, whether the unit is installed vertically or
horizontally. The guide rollers that receive the paper roll ease the load that occurs during paper
feed, improve the paper-feed pitch accuracy, and ease the maximum load applied to the paper
feed motor.
The paper detection LED works with the reflective photo detector on the platen holder and
detects the several types of paper. The paper detection LED is covered by a transparent resin to
prevent the detector from being destroyed by static. The NE detector detects the remaining
amount of roll paper. It can be set to perform detection at two points, depending on the setting.
This detector can be rotated by loosening it with a coin, and allows detection whether the
TM-L90 is installed vertically or horizontally.
The switch circuit board is installed onto the hinge cover, and the printer settings can be
configured with the DIP switches or FEED button, even when the cover is open. The printer
status is shown with LEDs.
LEDs
Label guide
Switch circuit board (inside)
DIP switch
Feed switch
Hinge cover
Label holder
NE detector
Paper detection LED
Guide rollers
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