UBI EasyCoder 501 SA, Руководство по обслуживанию

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UBI EasyCoder 501 – Service Manual
39
7.4
Ribbon End Sensor
7. TRANSFER RIBBON MECHANISM, cont'd.
The ribbon end sensor is a photoelectrical device that detects
whether there is any thermal transfer ribbon in the printer or not. It
is fitted to the centre-line wall immediately behind the print
mechanism by means of a single #T10 Torx screw. The sensor
assembly consists of a sensor with cable and connector, and a
combined mirror/bracket.
The ribbon end sensor works like this. A narrow beam of light is
emitted from the sensor and is either absorbed by the black transfer
ribbon, or reflected back by a mirror to a receiver in the sensor. The
software compares the signal from the sensor with the printer's
setup in regard of media type in order to avoid printing on the wrong
type of media:
Set up Detection Error
Thermal transfer media Ribbon OK
Thermal transfer media No ribbon Error 1027 Out of transfer ribbon
Direct thermal media No ribbon OK
Direct thermal media Ribbon Error 1058 Transfer ribbon fitted
If the printer is not fitted with a thermal transfer mechanism, the
ribbon end sensor must be disabled by a strap on P-9; pin J1 on the
CPU board. This strap also excludes any thermal transfer media
options from the setup. Obviously, if the printer is fitted with a
thermal transfer mechanism, such a strap must be removed.
The ribbon end sensor is connected to P-603 on the CPU board.
Continued!
Sensor
Mirror
Bracket