C616 Psb/Pse Board; C616 Main Board - Epson Stylus C67 Service Manual

EPSON Stylus C67/C68/D68

2.3.1 C616 PSB/PSE Board

In the PSB/PSE Board of Stylus C67/C68/D68, the simulated oscillating stimulation
flyback converter circuit method is used, and it supplies +42 VDC to the drive line.
The application of the output voltage is described below.
C616PSB Board: 100-120V
C616PSE Board: 220-240V
AC voltage input from AC inlet first goes through filter circuit that removes high
frequency components and is then converted to DC voltage via the rectifier circuit and
the smoothing circuit. DC voltage is then led 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.

2.3.2 C616 Main Board

The logic circuit of the C616 Main Board is composed of the following;
Logic line (CPU-ASIC 2 in 1, Flash-ROM and so on)
Motor control/drive circuit (CR Motor, PF Motor)
Head control/drive circuit
Sensor circuit
Reset circuit, EEPROM circuit
OPERATING PRINCIPLES
Table 2-4. C616 MAIN Board Major Components and Primary Functions
IC
FLASHROM
Reset Regulator
EEPROM
Motor Driver
Head Driver
ASIC
Electrical Circuit Operating Principles
Location Function
IC3 3.3 V drive 4 M bit flash ROM that stores the program.
IC1 3.3V/1.5V generate regulator, 2 ch reset circuit
IC4 Makes back up of default setting values and parameters
Drives CR/PF motors, controls PWM by the program timer,
IC6
adjusts 5 V, drives 42 V
IC7 Generates trapezoidal waveform, drives 5 V
Drives CPU (H8S/2674 base), internal 8 K byte x 4 RAM, 24
IC10
Mhz, 3.3 V/1.5V
Figure 2-4. C616 Main Board Block Diagram
Revision A
27