Apg Mechanism; Apg Motor Specifications; Apg Sensor - Epson Stylus Photo RX700 Service Manual

EPSON Stylus Photo RX700

2.2.3 APG Mechanism

2.2.3.1 APG Motor Specifications

Item
Type DC brush motor
Voltage 42V (DC voltage) ± 5% (voltage applied to the driver)
Armature resistance 64.7Ω ± 15%
Characteristics Inductance 33.6 mH ± 25%
Rotor inertia 3.97gcm
Drive system PWM system, constant-current chopping system
PG Adjustment Direction
→
PG- PG release: Larger PG OUT_A
←
PG- PG release: Smaller PG OUT_A
Drive system
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
PWM driving
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)
The slow-decay mode (chopping OFF time of 50
chopping for current control. The slow-decay mode is such that the blanking time is 6
Current
µ
sec. and both the transistors on the sink side are turned ON during chopping OFF in
chopping
PWM driving mode. (Synchronous rectification is enabled in the active mode.) The upper
±
limit current value is 0.5 A

2.2.3.2 APG Sensor

Function: Detection of the PG position
Detector specifications
Item
Detection method Photo-electric conversion system (transmissive-type photo-interrupter)
Electrical characteristics Voltage 3.3V ± 5%
Detected Condition
Each PG position area
Between PG positions
Operating Principles
Specifications
2
Direction of Motor Rotation (as
Current
viewed from the output side)
→
OUT_B CW
←
OUT_B CCW
µ
sec.) is always used during current
±
8%.
Specifications
Detector Output Remarks
H Light intercepted
L Light transmitted
Mechanism Operating Principles
APG Assy
CR Guide Shaft (Main)
CR Guide Shaft (Front)
Carriage Assy
CR Scale Mounting Plate Assy
Figure 2-9. APG Mechanism
Right Side
PG Right Cam
Spur Gear 25.6 (x2)
Figure 2-10. Gear Train of CR Scale Mounting Plate Assy
Revision A
APG Motor
APG Sensor
Release Assy
Upper Paper Guide
PG Right Cam
Spur Gear 20.8
23