MX-CFX1 ELECTRICAL SECTION 11 – 8
IC4-Pin1 (CS) is the chip selection terminal, and stays "H" during
passing data.
IC4-Pin2 (SK) is the serial clock terminal. The serial data is trans-
mitted synchronizing with the clock signal input to the terminal
IC4-Pin3 (DI) is the serial data input terminal. IC4-Pin4 (DO) is the
serial data output terminal.
7) Inrush Current Limiting Circuit
system to a certain value or less. The circuit consists of the PTC
thermistor (PTH2) that limits a current and the FET (Q11) that
allows a steady current flowing.
When the JAM cover open/closed detection switch is closed, the
cathode voltage of ZD1 starts rising to the zener voltage according
to the time constant of R55 and C46. During the rise of the cathode
voltage, Q11 is off because no base current to Q10 keeps Q10 off,
and then a current flows to PTH2 to charge the regeneration capac-
itor.
After the regeneration capacitor is fully charged, and the cathode
voltage of ZD1 reaches over the zener voltage according to the
time constant of R55 and C46, Q11 is turned on because the base
current from ZD1 to Q10 turns Q10 on. And then the current flows
to Q11 instead of PTH2 to release the current limitation. The circuit
consisting of PTH1 and D3 is intended to eliminate the electric
charge accumulated in C46 immediately to limit an inrush current
generated by momentary opening and shutting of the cover.
8) Operator Panel Drive Circuit
This circuit includes the input circuits of the switches on the opera-
tor panel and the drive circuits of the LEDs.
The circuits connected to CN15-Pin1, 2, 3 are the input circuits of
the switches on the operator panel. The input signal from the switch
goes "L" when the switch is on, "H" when off.
The circuits connected to CN15-Pin4,6-11 are the drive circuits of
the LEDs on the operator panel. The LED lights when the signal is
"H", does not light when "L".
J AM cover open/clos ed
Operator P anel
