Epson LQ-570e - Main Components

EPSON LQ-580 Revision C
O
perating Principles
C
ircuit Operation
5
3
2.3.3.1 Main Components
Table 2-6. Function of the Main Components
Component Location Name Memo
CPU IC7 TMP94C251
- 16 bit, 144 pin QFP
- 9.83MHz
- Main controller
- Detectors control
- CR Motor Control
Gate Array IC4 E05B76NA
- 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
- 19.66MHz
-176 pin QFP
Program
ROM
IC8
EPROM or OTP or
Mask ROM
EPROM: M27C800-10
(SGS) equivalent
- Program
- 8M bit
-16bit
DRAM IC5
MSM514260C (OKI)
equivalent 2CAS type
with page access
function
- Buffer and work area
- 4M bit
EEPROM IC11
AT93C46 Atmel (2ms/
word write)
- Stores default setting and various
parameters.
- 1K bit
-SOP 8 pin
CGROM IC6
MROM1: 44SOP
(600mil)
MROM0: 32DIP
(600mil)
- CG
-8 bit
Reset
Circuit
IC8
Reset IC BH6150F
Reset Circuit 2
- Reset IC
- Drives minimum Low-Pulse 60ms,
Reset signal.
-Detecting Voltage 4.2 ± 0.2V
Head Drive
Circuit
--
Tr 2SD2206A,
Di S5688G ,
Tr 2SD2635 ,
Di ISR139-400
-35V ± 6%
-Generate head (24pin) driving wave
based on the printing timing signal (CPU
output).
- Reset: G/A output L (Head drive OFF)
Cooling Fan
Circuit
Not used 2SD2176
-35V ± 6%
-Rated voltage drive
-On/Off by G/A board
-Resistor setting L:stop
Power
Supply
Control
Circuit
-- DTC124E
-At energy-saving mode, this circuit
switches power PSC signal to Open /
GND by Tr.
-On/Off by G/A board
-Resistor setting L:ON (at reset) H: OFF
-Detect the voltage by CPU A/D
ON voltage 22V/ Off voltage: 32.9V
-When it detects OFF voltage, it uses the
adjusted value by 35V drive voltage
adjustment value.
-When it detects ON voltage, it uses the
adjusted value by 20V drive voltage
adjustment value.
Eco-drive
Circuit
--
95V charging circuit
-Boosting chopper circuit
-Drives by fixed pulse generated by
CPU.
-ON 3.0us Frequency 40us
95V regular voltage
circuit
-Input regular voltage type chopper
circuit (for head current return)
-TL594 equivalent
-Rated input voltage: +5V
-Input voltage preciseness: +5V ± 10V
-Rated input current: 0.053A
-Input current range: 0A to 0.25A
-Output voltage: +35V ± 6%
-OVP: 150V or less (output OFF signal
against power supply unit.)
Table 2-6. Function of the Main Components
Component Location Name Memo