The replacement procedures are broken down for each individual harness. To retrieve the replacement procedure, click on the appropriate link provided at the bottom of this page. To service any harness that is not provided in this manual, contact Melco Technical Support. Such harnesses are usually not a user or field serviceable item.
Before attempting to replace a harness it is important that you first use the electrical troubleshooting procedures provided in this manual to positively identify the harnesses as probable cause of the machine failure. Replacing a harness represents a significant amount of work and might result in unneeded repair costs if the wrong component is replaced (i.e., a harness rather than a motor, or sensor, etc). Harnesses will generally be one of the last components in a particular circuit to fail. When they do fail, the usual cause is likely to be due to handling during repair and maintenance procedures, especially not allowing adequate slack when installing harnesses or letting harnesses contact moving parts. If harnesses are not bundled with twist-lock cable ties or routed correctly, there is a possibility that they may rub against or get caught in moving parts.
|
|
WARNING!! Always turn the power off before disconnecting or connecting any harness. At the minimum engage the emergency stop button by pressing
|
|
|
CAUTION!! As with any electrical component, always observe ESD safety procedures before handling any internal electrical components.
|
|
|
CAUTION!! Use extreme care not to drop metallic objects, tools, or other conductive material on the Main PCB when you have the base cover removed. If you drop such objects on the Main PCB, it can severely damage the electronics which will be very expensive to repair. |
When a harness is replaced, always run a short functional test on the components affected by the individual harness and run a Melco test design (appropriate to the harness you replace) on the machine.
Always route the harnesses explicitly according to the instructions provided for installing each harness. If you route a harness incorrectly, you might end up with too much slack remaining on the other end of the harness or you might have a harness that seems to be too short. Always start the harness from the end farthest away from the Main PCB (the end that connects to the applicable component such as a sensor or a motor). Doing it this way will allow you to conceal extra slack in the harnesses inside the machine base and away from any moving parts. Always securely tie the harnesses using twist-lock plastic cable ties as specified in the installation instructions for each harness. Reuse the twist-lock cable ties when you remove them from the harnesses.
Click on the links below for harness replacement procedures:
Grabber/Threadfeed Motor Harness
Grabber/Threadfeed/CC Home Harness
User Interface Harness
in on the user interface.