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Output Voltage
Use for
+5 V
LED head
+5 V
Logic circuit power supply, PU CPU
+34 V
Motor, drive voltage and power supply voltage for high voltage power supply
+12 V
High voltage power supply, Media Thickness Sensor power supply
(2) High Voltage Power Unit
This circuit generates the following voltages of not less than +34V, which are required for
electrophotographic process, according to control sequences from the controller board.
2.3
Power Units
A low voltage power unit consists of an AC filter circuit, low voltage power circuit and
heater driver circuit, and a high voltage power unit organizes a high voltage power circuit.
(1) Low Voltage Power Unit
This circuit generates the following voltages:
(3) MCON LSI
This LSI is used for input of SENSORs and the controls of Pulse Motors,Clutches,FANs and
High Voltage Power Suply.
(4) Flash ROM
The flash ROM (29F800-70) is of 8-Mbits, and PU programs are stored in it.
(5) EEPROM
The EEPROM (NM93C66N-NW) is of 4-Kbits, and mounted on the board with an IC socket.
Correction values are stored in it.
(6) Pulse Motor Driver
The pulse motor driver (A2919SLBTR, A3955SLBTR,MTD2005) drives the eight pulse
motors to revolve the ID and transport media.
(7) SRAM
This SRAM (628100LG-55L) is used as working memory of the CPU.
(8) SDRAM
This SRAM (56V16160T) is used as data memory of the DCON LSI.
Output
Voltage
Use for
Remark
CH
-1000V to 1.4KV+/-50V
Voltage to charging roller
DB
-50 to -300V/ +300V
Voltage to developing roller
SB
-300V to -450V/ 0V
Voltage to toner supplying roller
TR
C: 0KV to 7KV
Voltage to transfer roller
Variable
K,Y,M: 0KV to 6KV
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