Husqvarna K7000 Workshop Manual

Also see for K 7000: Operator's manual Operator's manual Workshop manual Operator's manual Operator's manual

TROUBLESHOOTING 7Insulation and earth continuity testingThese safety tests are the last things done when the service actionshave been completed and the machine has been reassembled.Insulation testingMeasure with 1,000 volts between an earthed metallic part whichcan be touched and the phases (K, A and B) of the contact. Theremust be no current flowing between earth and the phases (max.ohm value).Earth continuity testingEarth continuity testing shows that the machine's earthing is fault-free. Set the instrument for continuity measurement. Current mustflow between an earthed metallic part which can be touched andthe earth pin C of the contact (min. ohm value).Signal cables, connection testing and insulation testingThis test is used to check whether any cable is broken and whetherthere is any damaged insulation which is causing the wires to comeinto contact with one another.This test is carried out with a multimeter set for connectiontesting with a buzzer signal. The cabling does not need to beremoved from the machine for this test.Test methodically. The easiest way to proceed is to start from therectangular connector. Place the first test pin in any terminal. Usethe second test pin to test against all pins in the round contact. Ifthe cabling is intact, there must be a connection with one of thepins, but not with any of the others. Proceed using the samemethod to test the other cables. Note that there are pins with nocable connections: see the wiring diagram on page 6.There is very little likelihood of any of the signal cables cominginto contact with the motor cables due to damaged insulation, butthis can be tested by also including the motor's connector in thetest.Display cardIf the HF unit and cabling are complete, the cutting machine'sdisplay must be shown. If the information “UNKNOWN UNIT”is displayed, the display unit is defective. If this is the case, replaceit.Note: even if the display shows communication between thecutting machine and the HF unit, this is not proof that the cablingbetween the two is fault-free.21IMPORTANTLegislation on insulation and earth continuity testingdiffers from country to country. Hence it is impor-tant to find out about applicable regulations in thecountry in which the service is carried out.Insulation testing 1,000 voltsMeasure against phase pins K, A and Band earth pointEarth continuity testingMeasure against earth pin Cand earth pointSwitchThe cable connectors and removal of the switch from the controlunit are described on Pages 5 and 6.Switch functions can be checked using a multimeter set forresistance measurement. Check the resistance values across theterminals, numbered as illustrated, in passive and active modes.The values are typical for a functional switch.22a5 4 322a5 4 3Throttle, passive Throttle, active5–4: <20 kΩ4–3: approx. 220 kΩ ± 202a–2↓: ∞ Ω5–4: approx. 220 kΩ ± 204–3: approx. 0 Ω2a–2↓: approx. 0 Ω

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