67
Fig. 40: microcontroller board
When the pulses at TP13 are present without pressing "START" and with 15 V DC
at TP9, then the circuit board HF 42 is out of order.
If no scope is available, the pulses can be detected by using a voltmeter.
Normal values are about 0 V AC without pulses, and about 1 V AC with pulses.
This indicated value can be different, depending on the type of the voltmeter used.
Possible reason:
The triac is faulty (short circuit), and has to be replaced.
Fig. 41: circuit board HF 42
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