Edition 040830
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ch25bd_20
20
AP1 Control board
The control board monitors and controls the various functions of the power source.
If the board is faulty, it must be replaced. After replacing the board, soft--start the machine.
See the instructions on page 18.
20AP1:1
Power supply
Voltage regulator VR1 produces an output voltage of +20
¦
1.0 V. All circuits
on the control board, except the current reference, are supplied from VR1.
20AP1:2
Current reference input
The reference input is supplied with +5.1 V generated by IC3, the pulse width
modulator.
Potentiometer R1 adjusts the reference voltage from potentiometer 20RP1 for
correct maximum current value.
20AP1:3
Pulse width modulator
