Komatsu PC220LC -8 Operation & Maintenance Manual page 177

MACHINE OPERATIONS AND CONTROLS
Check Working Lamp Switch
Check that the working lamps and lamps inside the instruments light up properly. Check also that there is no dirt
or damage.
If any lamp does not light up, the bulb is probably blown up or there is a disconnection, so ask your Komatsu
distributor to carry out repairs.
1. Turn the starting switch to the ON position.
2. Turn the lamp switch ON (night mode (a), and day mode (b))
and check that the working lamp lights up.
Check Function of Horn
1. Turn the starting switch to the ON position.
2. Confirm that the horn sounds immediately when the horn
button is pressed.
If the horn does not sound, contact your Komatsu distributor for
repair.
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OPERATION