Chapter2 Operating Principles
Rev. A 2-1
9
C206 PSB/PSE board is a power supply board with a RCC switching regulator, which generates +42VDC f or
drive part and +5VDC for logic par t to dri v e the pri nter. One of t he maj or charact eristi c of this board i s that
the same secondary switch is used as Stylus Color series printer. By using this switch, the f ol lowing
difference can be seen as superficial phenomena com par ed wi t h products applied with primary switch
method, such as Stylus Color IIs, II and Stylus 800/1000 series pri nter. The table 2-12 below shows
application of voltages generated by C206 PSB/PSE board.
1) Even if the switch is turned off dur i ng the middle of printer operation, si nce the driving
power is turned off after the carriage goes back to the car r i age lock position,
the possibility of clogging ink nozzle will be decreased.
2) If the switch is turned off when the papers in the printer ar e still being carried except for
the papers in the hopper, the same operation mentioned above i s performed and the
driving power is turned off after t he paper is completely ejected.
Table 2-12. Application of DC Voltage
Voltages Application
+42VDC CR Motor
PF/Pump Motor
Head driving power supply
+5VDC Power supply for logic control
System control signal
Sensor circuit power supply voltage
LED panel drive power supply
Nozzle selector control signal power supply vol t age
Figure 2-18 shows block diagram of C206 PSB/PSE board. The process from the input of AC100V t o the
output of DC42V and 5V is explained below.
1) Regardless of the state of power switch(On or OFF), the voltage is always applied in the prim ary
side of the power supply board from the moment or at the state that AC-plug is plugged in.
At this time, F1 plays a role of prev enting AC100V from coming i nt o the F1.
L1 and R1-R2 also prevent high harmonic wave noi se generat ed i n the RC circuit filter which consist
of C1•`C4 and R1•`R2 from going out, and elim i nate the noise from outside here.
2) The AC is full-wave rectif ied by diode bridge DB1, and converted to 2x AC in voltage by smoothing
electrolytic capacitor C11.
3) The pressured up direct current makes Q1 On through the starting r esi stor R31 and star t s the primary
side of the circuit.
4) When the primary side is On state, the energy(current) led by the el ect romagnetic induction through
the trans (T1) does not flow to the secondary side since the diode(D51) on the secondary si de
is installed in the opposite direction.
5) When the energy which is charged in the trans is reaching the satur at ed state, the voltage which
makes the Q1 On becomes weak gradually. At the point that this v oltage drops at the
certain voltage, C13 absorbs the current in the opposit e direction and Q1 is quickly shut off by
the resulting sharp drop.
6) When the primary side is turned off , the energy charged in the T1 is opened according to the
diode(D51) direction which is installed on the secondary side. Basically, 42 V DC is output
by these circuit operations and the number of T1 spir al coil .
7) +5VDC is generated by pressured down this +42 V DC as power supply. IC51 pressures down the
+42 V DC and generates precise +5V DC by chopping off the output, f orming the standard santooth
waveform by the outer RC integrati on c i rcuit.