Epson LQ-570e - C293 MAIN Board Circuit

EPSON LQ-580 Revision C
O
perating Principles
C
ircuit Operation
5
2
2.3.3 C293MAIN Board Circuit
The C293MAIN board is composed by following main components and circuits.
Figure 2-5. C293MAIN Board Circuit Block Diagram
o Logic Circuit (CPU, ASIC, PROM, DRAM, EEPROM, CGROM)
o Mechanical Control Circuit
n Motor control and driving circuit (CR, PF)
n Head control and driving circuit
n Ditector circuit
n Reset circuit
o I/F Control Circuit
n Parallel interface circuit
n Type B interface circuit
o Eco-drive Circuit
n 95 V charging circuit
n 95 V regular voltage circuit
Panel Board
C293MAIN Board
PG Detector
TypeB I/F
CR Home
Detector
Release
Detector
PE_Front
Detector
PE_Rear
Detector
Parallel I/F
CG1 ROM
CG2 ROM RAM
PROM
Oscillator
CPU
IC7
(TMP94C251)
EEPROM
Panel
Panel SW Panel LED
Reset IC
PF Motor
Driver IC
CR Motor
Driver IC
Head Temp.
Detector
Head
Driver
PSC
POFF
+35V/GP
+5V/GND
Note: This mark
means connector.
Gate Array
IC4
(E05B76NA)
CAUTION
Be sure not to drive the eco-drive circuit without pre-charging when
assembling the printer or performing the service. (Be sure not to apply
power without connecting the head.)
Reason: When driving the circuit without pre-charge at the boosting
circuit on the eco-drive, the protection circuit may start working. (If
you drive the circuit without connecting the head, the fuse may blow
out.