Service manual

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6-16. DC/DC converter circuit
There are two DC/DC convertor circuit for
display.
For the 7 segment display voltages are
made by the DC/DC converter in display
PCB E445B-E2. Transistor Q3 is oscillating
and zener diode ZD3 feedbacks the output
voltage to control the oscilation.
VC
For the dot display voltages are made by the
DC/DC converter in display PCB E445B-E2.
Transistor Q1,Q2 ,IC6 and DC/DC converter
transformer T1.
The dot display MN12832E need the
following Voltages.
1. Filament Voltage VD1,VD2 = AC4.8V
2. Logic Volatge VCC= DC5V
3. Display Voltage VD3 = DC58V
6-17. ARCNET circuit (I/O PB14)
For the model CE-7000, the ARCNET board I/O PB14 is installed from the factory.
It is possible to connect up to 32 units without scanning system (scanning system up to
4 units) through the ARCNET In-line connection.
1. ARCNET CHIP COM20019ILJP