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DESCRIPTION OF OPERATION
This description of operation describes the function of circuit boards and other components
in the power source. It is divided into sections, numbered to correspond to the circuit board
numbers and divisions into function blocks.
2
AP1 Power supply board
The power supply board generates internal supply voltages for the machine.
Primary and secondary circuit
WARNING! Dangerous voltage - - mains voltage.
The primary circuit is supplied with 325 V DC from the power board, 15AP1. S1 is a fuse
with high rupturing capacity.
Transistor Q3 is the switching element in a switched voltage supply. The secondary voltage,
+24 V, is sensed by IC2 and controlled by IC1. It has a tolerance of ±0.6 V.
The isolation voltage of transformer T1 and optocoupler IC3 is 4 kV.
Edition 040830
- - 8 - -
ch25bd_2
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