Printer Circuit Operation - Epson Stylus PHoto 875DC Service Manual

EPSON Stylus PHOTO 875DC

2.1.4 Printer Circuit Operation

The printer circuit operation of this printer is the same as for the Stylus
PHOTO 870 except for the points below:
"
Power supply circuit
The card reader part is powered by the printer's
power supply board.
"
No parallel interface connector is supported but
art work exists.
"
USB interface circuit
Changed to the interface that connects to the PC
via the USB hub.
OPERATING PRINCIPLES
CPU (H8S/2328)
CPU (H8S/2328)
Head data driver circuit Head data driver circuit
24MHz
24MHz
Head pulse driver circuit
Head pulse driver circuit
ASF motor driver circuit
ASF motor driver circuit
DC motor control circuit
DC motor control circuit
(H8S/2357)
(H8S/2357)
ASIC Sensors
Sensors
(HG73C066FM)
Parallel I/F
2Kbit EEPROM
2Kbit EEPROM
(93C56 equivalent)
(93C56 equivalent)
Timer circuit
(RTC9810SA)
Reset Circuit
Reset Circuit
(RTC9810SA)
(RTC9810SA)
8Mbit PROM
8Mbit PROM
R27V852D
R27V852D
16Mbit DRAM
16Mbit DRAM
Figure 2-3. Printer Circuit Block Diagram
Overview
CR motor driver circuit
CR motor driver circuit
PF motor driver circuit
PF motor driver circuit
USB I/F
Mini USB
connector
Timer circuit
(RTC9810SA)
Revision A
24