3 2
Function Tests
Service Manual C91 / D91
en
Version 1.0
Protective insulation test (3)
Test sequence (continued):
The insulation resistance must be
higher than 300 kOhm (300,000 Ohm).
Some test equipment displays test
passed or failed instead of the insu
lation resistance.
6. Fill in measured value in a test report.
7. Touch closing handle screw with red test
probe.
Do not scratch surface of closing
handle with probe tip.
8. Press "measure" button.
9. Read off displayed insulation resistance
or test result.
The insulation resistance must be
higher than 300 kOhm (300,000 Ohm).
10. Fill in measured value in a test report.
11. Switch off test equipment.
12. Short red with black test probe to make
sure that test voltage is discharged.
What to do if the insulation test fails
Risk of damage!
A sparkover can damage the elec
tronic control board and sensors etc.
Assume that the coffee machine is defect after
a failed insulation test.
Check wiring and locate fault.
After fault clearance proceed with trouble
shooting check list (see page 14).
7
8
