Maintenance; Repairing; Troubleshooting - Stihl FSA 90 Instruction Manual

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17 Maintenance

17.1 Sharpening and Balancing a
Metal Cutting Attachment
Correctly sharpening and balancing metal cutting
attachments requires a lot of practice.
STIHL recommends you have metal cutting
attachments resharpened and balanced by a
STIHL servicing dealer.
► Sharpen the metal cutting attachment as
described in the instructions and on the pack‐
aging supplied with the cutting attachment you
are using.

18 Repairing

18.1 Repairing the Trimmer and
Cutting Attachment
The trimmer and cutting attachment cannot be
repaired by the user.
► If the trimmer or cutting attachment is dam‐
aged: Do not use your trimmer or cutting

19 Troubleshooting

19.1 Troubleshooting Brushcutter or Battery
Fault LEDs on the
battery
The brushcutter 1 LED flashing
does not start green.
when switched
on.
1 LED emits
red light.
3 LEDs flash
red.
3 LEDs light
up red.
4 LEDs fla‐
shing red.
42
attachment and contact your STIHL servicing
dealer.
18.2
The battery requires no servicing and cannot be
repaired.
► If the battery has a malfunction or is damaged:
Replace the battery.
Cause
State of charge of the
battery is too low.
The battery is too
warm or too cold.
The brushcutter has a
malfunction.
Trimmer is too hot.
There is a fault in the
battery.
No electrical contact
between brushcutter
and battery.
The brushcutter or
battery is damp.
Servicing and Repairing the
Battery
Remedy
► Recharge the battery fully as described in
the User Manual for the STIHL AL 101,
300, 500 chargers.
► Remove the battery.
► Allow the battery to cool down or warm
up.
► Remove the battery.
► Clean electrical contacts in the battery
compartment.
► Insert battery.
► Switch on the brushcutter.
► If 3 LEDs continue to flash red: Do not
use your brushcutter and contact your
STIHL dealer for assistance.
► Remove the battery.
► Allow trimmer to cool down.
► Remove battery and reinsert it.
► Switch on the brushcutter.
► If 4 LEDs continue to flash red: Do not
use the battery and contact your STIHL
dealer for assistance.
► Remove the battery.
► Clean electrical contacts in the battery
compartment.
► Insert battery.
► Allow the brushcutter or battery to dry.
17 Maintenance
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