EPSON LX-300+II/300+II RTP/1170II
Revision D
Operating Principles
Electrical Circuit Operating Principles
55
2.3.2 C294PSB / C294PSE Board
LX-300+II/1170II generates power supply by a power supply boards: either C294PSB
(100V) or C294PSE (200V) depending on local supplied voltage. The table below shows
the power supply boards input voltage specifications.
2.3.2.1 Electric Circuit
The power supply board supplies two types of power for control circuit and driving
mechanism. The table below shows output voltage and its use.
NOTE:
*: Core voltage of CPU and G/A is 3.3V and it is generated by the
regulator IC on the MAIN board from +5VDC.
Table 2-15. Main Elements
Elements
Location
Function
CPU
(C640/641MAIN)
IC3
RISC C33208 CPU, QFP 128 pin
• Outside clock 48 MHz/
Inside clock 48 MHz
• 8KBRAM built-in
• Various DMA
• A/D converter
G/A
*
(C640/641MAIN)
IC6
Approximately 21000 gates, QFP 160 pin
• Bit manipulation
• Clock control
• interface control (IEEE1284/Type-B I/F)
• Input Buffer control
• Motor control
• Head control
CPU/GateArray
(C640/641MAIN)
IC3
CPU:
RISC C33208 CPU, QFP 128 pin
• Outside clock 19.66 MHz/
Inside clock 39.32 MHz
• 8KBRAM built-in
• Various DMA
• A/D converter
Approximately 21000 gates, QFP 160 pin
• Bit manipulation
• Clock control
• interface control (IEEE1284/Type-B I/F)
• Input Buffer control
• Motor control
• Head control
PROM
IC7
4M / 8Mbit, DIP 40 / 42 pin
• Stores firmware
• CG
DRAM
IC8
1/2/4M bit switching method, SPJ package 40 pin
• Various buffer, work area
EEPROM
IC5
AT93C46, 1kbit, SOP 8pin
• Stores default value and various parameter
RESET IC
IC4
M62030 (SANYO), 8 pin
• CPU and G/A reset
CR Motor Driver
IC9
LB1847 (SANYO)
PF Motor Driver
IC10
LB1847 (SANYO)
Serial I/F
Transceiver
IC2
HIN202CBN or equivalent
Regulator IC
IC11
BA033 (ROHM) or equivalent
• Generates 3.3V logic voltage
Regulator IC
IC12
PD494 or equivalent
• 95V rated voltage circuit
• Detects over voltage (over 150V) and sends OFF
signal to the power supply boards.
Thermistor
TH1
Measures temperature of the motor driver.
Table 2-16. Power Supply Boards Input Voltage Specifications
Circuit
Input voltage
Fuse specification
C294PSB
99 - 132VAC
ULTSC-2.5A-NI
C294PSE
198 - 264VAC
HT 1.25A
Table 2-17. Output Voltage and its Use
Output voltage
Use
35 V +5%/ -10%
Drive
5 V ± 5%
Logic Voltage*
Table 2-15. Main Elements (continued)
Elements
Location
Function
Содержание cLX-300+II RTP
Страница 8: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Страница 42: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 56: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 65: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 85: ...C H A P T E R 5 ADJUSTMENT ...
Страница 92: ...C H A P T E R 6 MAINTENANCE ...
Страница 97: ...C H A P T E R 7 LX 300 IIRTP ...
Страница 110: ...APPENDIX ...
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