Paper Near End Sensor - Citizen CL-S6621 Technical Manual

Operation of Control Parts

(7) Paper Near End sensor

The paper near end sensor ("SA PNE Sensor") is used to detect a paper near end status of roll
paper installed in the printer.
By default, issuing a paper near end alarm is disabled. To enable it, you need to change the
Paper Near End Alarm submenu under the "PageSetup" main menu from Off to On.
Before a paper near end status occurs, the "Lever PNE" is pushed by the roll paper edge and
the "Slider PNE" of the paper shaft is engaged with the "SA PNE Sensor". Then, pin 77
(PNESNS) of U1A (CPU) goes "High" level, and the non paper near end status is detected by
the CPU.
When the roll paper diameter reaches the paper near end point being mechanically set, the
"Lever PNE" that was pushed by the roll paper edge pops up and the "Slider PNE" of the paper
shaft comes off the "SA PNE Sensor". Then, pin 77 (PNESNS) of U1A (CPU) goes "Low" level,
and the paper near end status is detected by the CPU. (Q12 turns ON in normal mode (i.e., in
other than power saving mode).)
U1A
CPU
D18
114
PNESNS
PCT7
77
[Normal Status]
Spring PNE
SA PNE Sensor
Slider PNE
CL-S6621
L: Power Saving mode
H: Normal mode
PWRSAVE
Q13
DTC115EM
U21A
1
2
Roll Paper Holder
Lever PNE
Roll Paper
+3.3V
Q12
DTA114EM
R89
C103
R90
R91
[SA, Main PCB]
[PNE (Paper Near End) Status]
Spring PNE
SA PNE Sensor
Slider PNE
2-30
Paper Near End Sensor
(SA PNE Sensor)
J12
(White)
PT301
1
1 PS301
2
2
3 3
Lever PNE
Roll Paper