Main Elements - Epson Stylus Photo 895 Service Manual

EPSON Stylus PHOTO 895/785EPX

2.2.2.1 Main elements

Following table provides the description of main element functions on the C408 main
board.
Table 2-9. Main Elements (Printer section)
IC Location
CPU-ASIC 2in1 16bit CPU mounted on the MAIN board is driven by
IC2
E01A22CA clock frequency 24MHz and controls the printer
• Capacity 4/8/16MB, Bus= 16 bit
PROM IC3
• Program for CPU or Program +CG
DRAM IC5, IC4 Bus= 16 bit, 4Mbit DRAM and 16Mbit DRAM
EEPROM section
• Default value setting
• Parameter backup
RTC9822
RESET section
(Reset function,
IC6 • For +3.3V; reset when +2.5V is detected
RTC, EEPROM
• For +5V; reset when +4.2 is detected
compound IC)
• For +42V; reset when +36 is detected
TIMER section
• Electric double layer capacitor (0.33F) is used.
Head drive control HIC
Common Driver IC12
• Generates head common voltage.
Motor Driver IC9 CR motor drive IC
Motor Driver IC11 PF motor drive IC
Motor Driver IC10 ASF motor drive IC
Operating Principles
Function
Electrical Circuit Operating Principles
Table 2-10. Main Elements (Printon section)
IC Location
• USB storage class target
CPU • PCMCIA control
IC15
V832 • Image processing
• Operating frequency: 47.6 MHz
• Package: 208pinPQFP
ASIC1
IC22
• Operating frequency: 47.6 MHz and 48 MHz
E05B75B*
• Data communication with the printer section
• Start and finish of DMA by MWPACKU
• SW condition is read from the printer PNL and
monochrome PNL.
• SW condition to the printer side is set from the CPU
ASIC2 and can be output.
IC17
E09A27A* • JFK image processing
• Fraction processing function applicable to the MW
packing function
• Clock synchronous serial interface
• The maximum 160 bit data are serial-exchanged and
transmitted to the LCD drive.
• Package: 16 pin S.O Package
PCMCIA Socket
Power Controller IC23
MAX1602
• Capacity: 16/8Mbit Bus=16bit
Flash ROM
MBM29LV160TC/ IC24 • Program
BC
• Capacity: 64Mbit (1M x 16bit x 4bank), Bus=16bit
SDRAM
IC18
K4S641632D • System memory
• Self power/pass power mode
• Applicable to full speed/low speed related to all
USB HUB IC
Down Stream ports
IC20
TUSB2036VF (TI)
• Applicable to the suspend/resume operation
• Suspend/status output
Revision A
Function
48