B4i-M
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Problem
5) Tacho test incorrect.
6) Vibrations.
7) Starting impossible.
All controls and
display are
operational.
Possible cause
Faulty tacho.
Faulty µP board.
Failure of the motor bearings.
Imbalanced load not detected.
Incorrectly fitted rotor.
Defective shock absorbers on
motor.
Defective or poorly fitted motor
“nose” seal.
Failure of the motor bearings.
µP board power bridge broken
down.
Defective start switch.
Remedy
Check the presence of a signal at the input to
the mother board (with an oscilloscope or DC
voltmeter). Pulses should appear every
12 sec. If absent or incorrect, change the
tacho.
If the pulses are correct, change the µP
board.
Check by hand that the motor turns freely.
Check and adjust, if necessary, the sensitivity
of the imbalance detector (see ch. 5.1).
If necessary, change the imbalance board.
Check the condition of the drive shaft collet
(plastic piece at base of shaft) and the spring
washers placed below the collet. Change
these pieces if necessary. Grease the
washers.
N.B. The shaft collet must slide freely on the
drive shaft.
Change shock absorbers.
Change or refit the seal. Pay careful attention
to positioning and gluing it.
Check by hand that the motor turns freely and
without noise or abnormal friction. If
necessary change the motor.
Change the µP board.
Change the keyboard.
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