Jonsered CS 2141 Workshop Manual page 21

6
Unscrew the two bolts from the right side of the
rear hand grip. Remove the throttle lock and throt-
tle handle, see "Throttle trigger". Pull out the heater
element with the leads still connected.
Troubleshooting carburettor heater
(CS 2147 W, CS 2149 W, CS 2152 W, CS
2156 W, CS 2159 W)
Operation
The carburettor temperature is controlled by an
electronic thermostat to eliminate the risk of ice
formation in the carburettor. The thermostat switch-
es on/off at 12°C/54F. This means that the saw
operator does not need to remember to switch the
carburettor heater on or off.
• Troubleshooting
Front handle heater
Remove the side cover from the handle. Discon-
nect the leads at F and G (see diagram).
Clean the connectors. Turn the switch "on".
Measure the resistance between F and G.
The reading should be 4±1 ohms. If not, discon-
nect the lead at O and remove the switch.
Measure the resistance between O and F. The
reading should be 4±1 ohms. If the resistance is
incorrect, replace the front handle.
Disconnect the lead at N and G and measure the
resistance between these points. The reading
should be no higher than 0.1 ohm. If it is too high,
replace the lead.
Switch
Measure the resistance between N and O with the
switch turned off. The reading should be 1 000
ohms or higher.
Repeat the measurement with the switch turned
on. The reading should be no higher than 0.1 ohm.
If it is too high, replace the switch.
Rear handle heater
Measure the resistance between F and Z. It should
be 1 ± 0.5 ohm.
If not, replace the rear handle heater.
Generator
Measure the resistance between G and H. It
should be between 0.3–1.3 ohm.
If not, replace the generator.
Carburettor heater
Disconnect the lead at X and clean the connectors.
Measure the resistance between X and G.
The reading should be between 3–10 ohms. If not,
disconnect the lead at Y and clean the connectors.
Measure the resistance between X and Y, if the
reading is not between 3–7 ohms – replace the
carburettor heater.
Repair instructions
21
English –