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Electrical Failures
Color Change Failures
The machine color change is controlled through the use of an encoder, a stepper motor, the controller
chip on the Main PCB and the software. The Melco OS will usually give an indication of what the actual
failure is. The encoder and the color send a signal through the harness to the Main PCB and the status is
reported by the rmware to the Melco OS, and then displayed on the computer screen.
Step Procedure Condition Solution/Step
1 Check for an obstruction
blocking movement of the
needlecase assembly
Obstruction found Clear it
No problems Go to Step 2
2
Check for binding on the color
change spindle
Bind found Lubricate the color change
spindle
No bind found Go to Step 3
3 Turn the machine off and
turn it back on again. Reboot
the computer and reload the
Melco OS.
Color change works Probably corruption of data in
the RAM
Color change fails Go to Step 4
4 Conduct an optical sensor test
on both the needlecase sensor
(installed in the needlecase)
and the color change home
sensor (installed in the lower
arm between the reciprocator
and presser foot shafts).
Either sensor bad Replace optical switch
assembly
Both sensors good Go to Step 5
5 Measure the resistance of the
stepper motor (Measure the
resistance between the phase
wires. Disregard the ground
(green) wires.)
Resistance < than 7 ohms Short in the stepper motor,
replace it.
Resistance > 10 ohms Open in the stepper motor,
replace it.
Resistance between 7 and 10
ohms
Go to Step 6
6 Above steps failed to nd
problem.
Contact Technical Support for
assistance.
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