Ribbon Encoder Sensor - Citizen CL-E700 series Technical Manual

(7) Ribbon encoder sensor

The ribbon encoder sensor consists of one photointerrupter and is located on the ribbon supply
side (rear side) of the "Unit Ribbon". It is used to detect the running status of ribbon as well as
the ribbon end.
While the ribbon is running, the "Holder Ribbon Shaft Encoder" (supply reel) is rotated by the
running ribbon and its slits on the bottom cross the interrupter (PS501) on the "SA Ribbon
Encoder". Thus, a pulse train is output from the interrupter to pin 43 (RIBSENS_ENC) of the
CPU (U1A).
When the ribbon runs out during printing, the CPU detects the ribbon end state as no pulse
train is given. When the ribbon end is detected, the LED on the operation panel blinks in red
and the LCD displays "Error Ribbon End", and the printer goes off-line.
U1A
CPU
RIBSENS_ENC
P6_12
43
* In power saving mode, +3VIO is not supplied. For details, refer to
circuit".
[Right side view]
+3VIO
+3.3V
J4
R79
8
U12C
RA17
23
6 5
3-6
[SA Main PCB]
J301
J304
1 1
8
+3VIO
12 12
23
RIB_SENS_ENC
3-6 14-16
[SA Relay PCB]
Ribbon
Photointerrupter
SA Ribbon Encoder
(Ribbon Encoder Sensor)
2-31
Chapter 2 Operating Principles
2-2.
Operation of Control Parts
Ribbon Encoder Sensor
J601
PT501
J605
1 1 +3VIO
+3VIO
2 2
RIBENC
3 3
14-16
[SA Ribbon
Control PCB]
[SA Ribbon Encoder]
"2-2-6(1) Power supply
Holder Ribbon Shaft Encoder
CL-E700 series
PS501
R501