¶ Phenomenon:
1. Homing Z axis fails sometimes.
(Note: Press “Assistant” and follow the guide to troubleshoot the issue first, It can help you locate the cause of failure. )
2. The cable connecting to the heatbed is under tension.
¶ Cause
The movement of the heatbed pushed the cable toward to the MC board, and make it too short to support the complete rising of the heatbed.
¶ Solution:
Temporary solution：
Raise the heatbed and power OFF the printer. Then pull the cable towards the heatbed a little bit, from the Z lead screw gap, to make the length of the cable enough to achieve the Z homing (see picture below).
Permanent solution:
Limit the cables to prevent excessive movement.
¶ Step 1 - Raise the heatbed
Move the toolhead to the excess chute (in case of crash), and raise the heatbed to the top.
¶ Step 2 - Remove screws
Disconnect the power cord, and then remove the 10 screws and 4 screws from the rear cover shown in the picture. There are 2 types of screws, so keep them separate and remember which ones go where.
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¶ Step 3 - Remove the rear cover
Remove the rear cover, unlock the left side belt tension ports first and then the right side one, to avoid getting stuck.
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¶ Step 4 - The heatbed cable
Now you can see the cable of the heatbed more clearly. There is a cable buckle that holds the cable.
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¶ Step 5 - Apply cable tie
Apply foam tape to the cables to prevent them from moving too much toward the MC board(But do not tighten too much in case of broken the cable inside). Try to move the cables to confirm that it works OK.
¶ Step 6 - Install the back cover
Pass through the tube bracket, and install the right side belt tension port first to install the back cover.
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¶ Step 7 - Lock screws
Screw the back cover. Take note of the different types of screws used (10 and 4 as shown below).
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