8
The motor
Control of function
The functioning of the motor can be checked without
dismounting the printed circuit. Use a spare part circuit
and connect it to the connections on the terminal board
and test the machine in the ordinary way.
The motor noise is affected by the load and the belt
tension. Only motors which have a noise level
considerably deviating from normal should be
exchanged.
Dismantling
Set the thread take-up lever at the lowest position,
remove the handwheel and then take away the belt
guard, rear cover and the cog belt.
Pull out the plug by the motor and remove the
screws (5/16) in the base plate; fold under the
connection terminal board. Then remove the
screws (14/36) in the holder of the reduction gear
and lift out the motor. Mounting is done in the
reverse order. Check the belt tension. Replace
and fasten the rear cover, belt guard and
handwheel, making sure that the thread
take-up lever is at the lowest position and that
the metal latch on the handwheel points upwards.
Spare parts: See RA, page 16.
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