EPSON Stylus Pro 7600/9600 Revision A
Operating Principles Print Mechanism Components 107
HD_SLID (Head Gap Home Position Detection) Sensor
This sensor detects the mechanical home position when the position of the sub-
carriage (head height from the paper surface) on the carriage undergoes change. A
reflective type photosensor is used and the position of the flag on the gear mounted
on the camshaft is detected.
The cam is so shaped as to realize the four head positions relative to the
mechanical home position.
Detecting distance up to the reflector: 7.5 ± 0.5 mm
NOTE: Error number displayed when the total pulse count has exceeded 1000:
0001000C Head slide origin detection error (Service Call Error)
Figure 2-5. Head Slide (PG Change) Initialization Sequence
Table 2-4. Pulse Positions
Position Gap Width Application
Pulse Count from
Origin (Converted to 2-
2 Phase Excitation)
Large 2.6 mm Platen gap for thick paper 37
Medium 2.2 mm Platen gap for paper which can be
soiled if setting is for thin paper
121
Small 1.2 mm Platen gap for thin paper 204
Minimum 0.7 mm Platen gap for film 287
One round 333
Pump motor runs forward until head slide origin sensor turns
OFF
Slide Sensor OFF
?
Start
Sequence for moving to pseudo-vacuum position
Pump motor runs forward until head slide origin sensor turns
ON
After head slide origin sensor turns ON, pump motor runs
forward by 10 pulses
Yes
No
Yes
No
No
Yes
Slide Sensor OFF
?
Slide Sensor ON
?
Pump motor runs forward until head slide origin sensor turns
OFF
No
Slide Sensor OFF
?
Yes
Pump motor runs forward by 204 pulses (till the “Small”
platen gap position)
Pump motor runs forward by 18 pulses (till epicyclic gear
release)
End
