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Operation of Control Parts
2-23 CL-S6621
J11
Head Up Switch
(Blue)
+3.3V
2
R78
HDUSW
U1A
CPU
PDH3
117
C99
R80
SA, Head Up Switch
1
Head Up: High
Head Down: Low
[SA, Main PCB]
2-2-3. Sensors
(1) Head up switch
The “SA, Head Up Switch” is used to detect the head position (up or down).
When the “Unit, Head” is closed (in the down position), the ”Support Pop Up” of the “Unit,
Head” pushes the “Pop Up Cover Frame” and the “SA, Head Up Switch” pushes the lever of
the “SA, Head Up Switch” and the switch turns ON. Then, pin 117 (HDUSW) of U1A (CPU)
goes "Low" level.
When the “Unit, Head” is opened (in the up position), the ”Support Pop Up” is disengaged from
the “Pop Up Cover Frame”, the lever of the “SA, Head Up Switch” is set free, and the switch
turns OFF. Then, pin 117 (HDUSW) of U1A (CPU) goes "High" level.
SA, Head Up Switch
Spring Pop Up
Support Pop Up
Pop Up Cover Frame
Unit, Head
["Unit, Head" Up Position]
["Unit, Head" Down Position]
ON
OFF
Pop Up Cover Frame
Support Pop Up
SA, Head Up Switch
Spring Pop Up