Operation Panel (Sa, Opepane Pcb); Thermal Print Head (Sa, Head); Sensors; Motors - Citizen CL-S6621 Technical Manual

Operation of Control Parts

(3) Operation panel (SA, Opepane PCB)

Used to indicate the operating status of the printer and to set specifications. It consists of 4
keys and 4 LEDs.

(4) Thermal print head (SA, Head)

Makes printing on paper. The number of thermal elements (dots) is as follows. The thermal
print head includes the print head driver circuit.
•1344 dots

(5) Sensors

The following 9 sensors are used in the printer:
Sensor name
Head Up Switch
(SA, Head Up Switch)
Transparent Sensor
Reflective Sensor
Ribbon Sensor F
Ribbon Sensor R
Thermal Head Temperature
Sensor
PF Motor Temperature Sensor
Ribbon Motor Temperature Sensor
Paper Near End Sensor

(6) Motors

Three motors are used.
- The "SA PF Motor" is a stepping motor to feed media.
- The "SA Ribbon Motor F" and "SA Ribbon Motor R" are stepping motors to take up and
supply ribbon, respectively.

(7) SA, Ribbon PCB

Controls the operations of the "Unit, Ribbon".
(a) Stepping motor driver
This is a circuit to drive the "SA Ribbon Motor F" on the front side for taking up ribbon and
the "SA Ribbon Motor R" on the rear side for supplying ribbon. Both are stepping motors.
CL-S6621
A mechanical lever switch.
A photo sensor using a phototransistor. (On the "SA
TRA Sen PCB".)
A photo sensor consisting of 2 LEDs and 1
phototransistor. (On the "SA Ref Sen PCB".)
Photo sensors (2 pcs.) using photointerrupters.
(Located on the "SA, Ribbon Sensor" on the front side.)
Photo sensors (2 pcs.) using photointerrupters.
(Located on the "SA, Ribbon Sensor" on the rear side.)
A thermistor incorporated in the "SA, Head".
A thermistor attached to the "SA PF Motor".
A thermistor attached to the "SA Ribbon Motor F" (the
front side of ribbon motor).
A photo sensor using a photointerrupter. (On the "SA
PNE Sensor".)
2-20
Description