C229Main Board Circuit - Epson FX-880 Service Manual

2.3.2 C229MAIN Board Circuit

The C229MAIN board is the control circuit board of this printer. This board consists of several IC
chips and drivers, as shown in the table below:
Element
TMP96C141AF
E05B50
PST594E
AT93C46
PSRAM
ROM
SLA7024M
A2917SEB
Comparator
Rev. A
Table 2-3. Function of the Main IC
Location
IC3 16 bit CPU runs at 14.47MHz
- Main controller
- Detectors control
- CR Motor Control
IC2 Gate array : System Controller
- Parallel I/F control
- Option Type-B I/F control
- Panel Switch, LED control
- Printhead Control
- PF Motor Control
- CR Motor Current control
IC1 Reset IC : Hardware reset function
IC4 EEPROM :
System control data (Market, TTL threshold, Bi-D setting, Page
length, TOF, etc.) containing
IC5 1M/4M bit
- Buffer and Working area of CPU & Gate array
IC7 2/4M bit EPROM/ Mask ROM
- Control program containing
IC8 CR Motor driver
IC11 PF Motor driver
IC12 Power-off signal sensing
Figure 2-5 . C229MAIN Board Circuit Block Diagram
FX-880 Service Manual
Chapter 2 Operating Principles
Function
2-5