Epson Stylus Photo R800 - Page 34

EPSON Stylus Photo R800 Revision A
OPERATING PRINCIPLES Electrical Circuitry Operating Principles 35
The following indicates differences between the control circuits of this product
and conventional model.
 Adoption of 1.5V drive logic circuit components
The 1.5V voltage is generated by the Regulator IC installed on the C550
MAIN Board that reduces +3.3VDC generated by the C550 PSB/PSE
Board, and is used to drive multiple components.
This is done to reduce the power of the logic circuit.
The following table indicates the 3.3V drive components and 1.5V drive
components.
Table 2-10. 3.3V and 1.5V Drive Components
3.3V 1.5V
• Nozzle selection circuit
(above Print Head)
• CR Encoder Sensor
• PE Sensor
• PG Release Sensor
•CSIC
• CPU-ASIC 2 in 1
•PROM
• SDRAM
• Motor circuit
• Panel LED
• Interface circuit
• USB 2.0
• Sensors
(other than CR Encoder Sensor, PE
Sensor, PG Release Sensor)
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