Jonsered 2036 Workshop Manual page 32

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Electrical system
Clean and measure both handle inserts between points 2 and 3. The switch should be
in the switched off position. Correct measurement value: 1.4 - 1.8 Ohm.
If the values measured differ from the recommended values measure each insert
separately.
Connect the instrument between points 4 and 2, and 4 and 3.
Correct measurement value for one handle insert: 0.7 - 0.9 Ohm.
Checking of the front handle element
Connect the measuring instrument between the points 1 and 3. The heater switch
should be switched off. Correct measurement value: 4 Ohm ± 0.5 Ohm.
If the heater element is defective the complete front handle must be replaced.
Checking of all heater coils
The two rear handle inserts and front handle are checked as follows:
Connect the measuring instrument between points 1 and 2. The switch should be
switched off.
Correct measurement value: 5.1 - 5. 7 Ohm.
Deviations in the values can be the result of defective components, oxidation, flash-
over or a break in the circuit.
Checking of the generator
The voltage is measured when the chain saw is run at approx. 10.000 rpm. Measure
between point 1 and the crankcase. The switch should be switched on and all heater
coils connected. Correct measurement value: approx. 20 volts at 10.000 rpm.
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Possible faults:
● Break in generator's windings. ● Weak magnetisation in the flywheel.
● Cable break.
!
WARNING!
The chain, guide bar and clutch cover must be fitted before the chain saw is started.
Mod. 2054/2055
Checking of the front handle element
Connect the measuring instrument between the points 2 and 3. The heater switch
should be switched off. Correct measurement value: 5 Ohm ± 0.5 Ohm.
The complete front handle must be replaced if the heater element is defective.
Checking of the carburettor heating
Connect the measuring instrument between the points 4 and 5. The heater switch
should be switched off. Correct measurement value: 5 Ohm ± 0.5 Ohm.
Checking of the rear handle element
The rear handle insert is checked as follows:
Connect the measuring instrument between points 2 and 6 (earth). The switch should
be switched off.
Correct measurement value: 0 Ohm ± 0.1 Ohm.
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Deviations in the value can be the result of defective components, oxidation, flash-over
or a break in the circuit.
Checking of all heater coils incl. the carburettor element
Connect the measuring instrument between point 1 and earth.
Correct measurement value with switch in position handle heating: 5 Ohm ± 0.5 Ohm.
Correct measurement value with switch in position distributor heating: 5 Ohm ± 0.5
Ohm.
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Checking of the generator
The voltage is measured when the chain saw is run at approx. 10.000 rpm. Measure
between point 1 and the crankcase. The switch should be switched on and all heater
coils connected. Correct measurement value: approx. 20 volts at 10.000 rpm.
Possible faults:
● Break in generator's windings. ● Weak magnetisation in the flywheel.
● Cable break.
!
WARNING!
The chain, guide bar and clutch cover must be fitted before the chain saw is started.