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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
ch25bd_20
- - 14 - -
Edition 040830
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