EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A
OPERATING PRINCIPLES Electrical Circuit Operating Principles 53
2.4 Electrical Circuit Operating Principles
The electric circuit of the Stylus CX3700/CX3800/CX3805/CX3810/DX3800/
DX3850 consists of the following boards.
Main Board (CPU-ASIC 2 in 1 + So
ldering Flash ROM)
C612 Main Board
Power Supply Board
C610 PSB/PSE Board
NOTE: CPU and ASIC is integrated as one chip (IC8) on the Main Board.
This section provides operating principles of C
612 Main Board and C610 PSB/PSE
Board. Refer to Figure 2-17 (p.53) for the major connection of the each boards and
their roles.
Figure 2-17. Electric circuit
2.4.1 PSB/PSE Board
In the PSB/PSE Board of Stylus CX3700/CX3800/CX3805/CX3810/DX3800/
DX3850, the simulated oscillating stimulation flyback converter circuit method is
used, and it supplies +42VDC to the drive line. The application of the output voltage is
described below.
AC voltage input from AC inlet first goes through filter circuit that removes high
frequ
ency components and is then converted to DC voltage via the rectifier circuit and
the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1
preforms the switching operation. By the switching operation of the primary circuit,
+42VDC is generated and stabilized at the secondary circuit.
C612
Main Board
C610 PSB/PSE
Board
Sensors
Head Driver Board
PF Motor
CR Motor
Printer Mechanism
+42VDCPower Off
C612 PNL Board
Scanner Mechanism
Scanner Motor
CIS Unit
Scanner HP Sensor
Table 2-7. Application Of The DC Voltages
Voltage Application
+42VDC
• Motors (CR Motor, PF Motor, Scanner Motor)
• Print Head common voltage
• Print Head nozzle selector 42V drive voltage
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