EPSON Stylus Photo RX700 Revision A
Operating Principles Mechanism Operating Principles 23
2.2.3 APG Mechanism
2.2.3.1 APG Motor Specifications
Drive system
2.2.3.2 APG Sensor
Function: Detection of the PG position
Detector specifications
Figure 2-9. APG Mechanism
Figure 2-10. Gear Train of CR Scale Mounting Plate Assy
Item Specifications
Type DC brush motor
Voltage 42V (DC voltage) ± 5% (voltage applied to the driver)
Characteristics
Armature resistance 64.7Ω ± 15%
Inductance 33.6 mH ± 25%
Rotor inertia 3.97gcm
2
Drive system PWM system, constant-current chopping system
PG Adjustment Direction Current
Direction of Motor Rotation (as
viewed from the output side)
PG-
→ PG release: Larger PG
OUT_A
→ OUT_B CW
PG- ← PG release: Smaller PG
OUT_A ← OUT_B CCW
PWM driving
The motor is turned ON during the time determined by calculation in the specified PWM
fundamental period PWMcrc, and turned OFF during the rest of the period. The time
resolution of the PWM is 41.7 nsec, which is taken as one count. The motor is driven in
Slow Decay mode and stopped by a short brake. (Duty = 0)
Current
chopping
The slow-decay mode (chopping OFF time of 50 µsec.) is always used during current
chopping for current control. The slow-decay mode is such that the blanking time is 6
µsec. and both the transistors on the sink side are turned ON during chopping OFF in
PWM driving mode. (Synchronous rectification is enabled in the active mode.) The upper
limit current value is
± 0.5 A ± 8%.
Item Specifications
Detection method Photo-electric conversion system (transmissive-type photo-interrupter)
Electrical characteristics Voltage 3.3V ± 5%
Detected Condition Detector Output Remarks
Each PG position area
H Light intercepted
Between PG positions
L Light transmitted
APG Assy
APG Motor
APG Sensor
CR Guide Shaft (Main)
Carriage Assy
Release Assy
CR Scale Mounting Plate Assy
CR Guide Shaft (Front)
Upper Paper Guide
Right Side
PG Right Cam
Spur Gear 20.8
Spur Gear 25.6 (x2)
PG Right Cam
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