Citizen CLP-621, Technical Manual

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2-2. Operation of Control Parts
2-17
CLP-621 & CLP-631
(4) Thermal print head
The thermal print head has the following thermal elements. It also has the print head driver
circuit.
• 864 dots for CLP-621
• 1275 dots for CLP-631
(5) Sensors
The following 7 sensors are used:
Sensor name Description
Head Up Sensor Photointerrupter.
Transparent Sensor Photo sensor using the phototransistor.
Reflective Sensor Photo sensor consisting of 2 LEDs and 1
phototransistor.
Tension Sensor (Front/Rear) Photo sensor using the phototransistor. Located on the
front and rear of the Ribbon Unit.
Head Temperature Sensor Thermistor incorporated in the print head.
PF Motor Temperature Sensor Thermistor attached to the PF Motor.
Ribbon Motor Temperature Sensor Thermistor attached to the Ribbon Motor F.
(6) Motor
Three motors are used. The PF Motor is a stepping motor to feed media. The Ribbon Motor F
and Ribbon Motor R are stepping motors to take up and supply ribbon, respectively.
(7) Parallel I/F (IEEE1284)
This is the parallel I/F to transmit and receive parallel data between the printer and the host. It
supports Centronics Compatible mode, NIBBLE mode and ECP mode.
Parallel I/F, serial I/F, or USB I/F is automatically selected when data is received.
(8) Serial I/F (RS-232C)
This is a circuit to transmit and receive serial data between the printer and the host.
Parallel I/F, serial I/F, or USB I/F is automatically selected when data is received.
(9) USB (Universal Serial Bus) I/F
This is a circuit to transmit and receive serial data between the printer and the host using the
USB.
Parallel I/F, serial I/F, or USB I/F is automatically selected when data is received.
(10) Ethernet I/F (Option)
This is a circuit which supports Ethernet protocol. LAN connection is possible.
(11) Wireless LAN I/F (Option)
This is a circuit which supports Ethernet protocol. Wireless LAN connection is possible.