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Insulation resistance test
This test verifies the insulation resistance
between the protective earthing conductor of the coffee machine and the phase/
neutral conductor of the coffee machine.
of all conductive and touchable parts of the coffee machine (with the help of a test
probe).
Test procedure
1. The coffee machine is assembled completely and has passed the protective
earthing test. The capsule holder is removed.
2. Connect power plug of coffee machine to test equipment (A).
3. Switch on test equipment (B) and select protective insulation test.
4. Read off displayed insulation resistance between earthing conductor and phase/
neutral conductors.
5. Switch test voltage to test probe (if necessary).
6. Touch needle at underside of extraction head (see detail) with test probe.
7. Press start button (C) and read off displayed resistance.
The insulation resistance must be higher than 2.0 Mega Ohm with a test
voltage of 500 VDC.
If insulation test fails, a sparkover has damaged the coffee machine probably.
In that case check wiring, locate fault(s) and proceed with troubleshooting check list.
Repeat protective insulation test.
F I N A L I N S P E C T I O N S
Service manual
55
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