Citizen CL-S6621 - Chapter 2 Printer Operation; Power ON;OFF

Operation of Each Mechanism
2-5 CL-S6621
SA, Head
Transparent sensor
(SA TRA Sen PCB)
SA PF Motor
SA, Head Up Switch
SA PNE Sensor
Reflective Sensor
(SA Ref Sen PCB)
(2) Printing section
Part name Description
SA PF Motor This motor feeds media. A thermistor is attached to the side surface of this
motor to detect the motor temperature.
SA, Head Up Switch This switch is a mechanical lever switch to detect the print head position;
up or down.
Transparent Sensor
(Upper sensor)
(SA TRA Sen PCB)
This sensor is a photo sensor to detect the labels stuck on liner or
U-shaped notches on tag. It also detects the media end.
Reflective Sensor
(Bottom sensor)
(SA Ref Sen PCB)
This sensor is a photo sensor to detect the black marks on tag. It also
detects the media end.
SA, Head It consists of a head driver and thermal elements. Thermal elements are
heated to make printing on media. The thermal head incorporates a
thermistor to detect the thermal head temperature.
SA PNE Sensor
(Paper near end
sensor)
This sensor is a photo sensor to detect a near end status of roll paper
installed.