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SOFT STARTING
Remove and insulate wires 007 and 008 from rectifier bridge V01: see the circuit
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diagram on page 7 and 8 for LHN 130/140.
In the LHN 200, also remove and insulate wire 009 to rectifier bridge V02: see circuit
diagram on page 10.
Connect an external power supply, having a current limit of 1 A, to the positive and
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negative connections on V01.
Adjust the power supply voltage to 30 V.
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Power the remaining parts of the unit from the normal power supply.
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Measure the output voltage from the machine. On the LHN 130/140 this must be 10 V
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±
1 V, and on the LHN 200 it must be 6 V
Measure the primary voltage to transformer TC02. With a voltage of 30 V across the
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buffer capacitor, the waveform must appear as shown below.
Primary voltage at TC02 for 30 V across the buffer capacitor
cmha2de1
±
1 V.
- - 25 - -
cmha2p24
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