Essilor Instruments APH 550

6
2 Block Diagram
Enclosure
Control unit
Operation
unit
Control
circuit
Printer
Printer
drive
circuit
Reinforced insulation
Head rest
Enclosure
Position
detecting
sensor
Right chart LED
Left chart LED
Motor control circuit
Position
detecting
sensor
Head unit
Interface
Enclosure
Power supply box unit
Fuse
Power switch
Communication
control circuit
Basic insulation
Switching supply
Reinforced insulation between primary and secondary
Left motor drive circuit
Illumination
LED
Position
detecting
sensor
Right motor drive circuit
Illumination
LED
Position
detecting
sensor
Lens disk motor ×9
Lens disk motor ×9