Janome QMP16SU Manual page 64

How to use the Motor Sensor Test
Rotate the hand wheel. You should hear a regular beep pulsing on and off as you rotate the hand wheel.
These pulses are based on feedback from the Hall Sensors that are internal to the motor. If you do not hear
the pulsing on/off as you rotate, this could indicate any of the following:
The motor is not receiving power
• Check power wires going to the motor driver board as well as wires going out to the motor to be sure
the wires are properly connected (check that the terminal screws are pinching the wire and not the
wire insulation). If the driver board is receiving power, you should see a green power LED lit up on the
motor driver board.
The Hall Sensor wires are not properly connected
• Check the thinner wires going from the motor driver board to the motor and be sure they are all
properly connected in the terminal block. As you rotate the hand-wheel, you should see a green LED on
the motor driver board pulse on/off at the same rate as you hear the beep in this test.
The motor driver board has failed
• If you can verify that you have power properly connected to the motor driver board and you can
measure 48V at the power connector, but neither the Power nor Hall sensor LEDs light up on the motor
driver board.
• Testing with a replacement motor driver board causes the motor to function properly (be sure the
driver board has been properly calibrated at the factory for the specific machine model it is being used
on and burn-in is run to properly calibrate speeds).
The motor has failed
• The green 48V power LED is lit on the motor driver board
• All wires are properly connected (check for insulation being pinched in terminals)
• Rotating the hand wheel does not cause the Hall Sensor LED on the motor driver board to flash
• Replacing the motor resolves the problem (be sure all wires are properly placed in terminals)
Motor Speed Sensor Test
When to Run the Motor Speed Sensor Test
This tests the outer region of the main shaft encoder sensor.
• Validates that all 100 counts of the main shaft encoder are being read.
• Should be tested if a Needle Sensor Failure message occurs and running the Burn-in Calibration
procedure does not resolve the issue.
How to use the Motor Speed Sensor Test
If the result of this test is anything other than 100 counts (but not zero), the following should be checked:
• Check the encoder disc closely for any damage or wear to any of the black lines. Replace the encoder
disc if any damage is found.
• Position the forked main shaft encoder board such that it is centered with the encoder disc and is up
as high as possible without interfering with the disc. The disc should not touch any part of the encoder
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