> For the complete documentation index, see [llms.txt](https://manual.rotrics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.rotrics.com/faq-troubleshooting/troubleshooting/cracked-case.md).

# Replace the cracked case

{% hint style="success" %}
**📅Update: 2020/09/28**
{% endhint %}

## 1. Tools

1. M2.5 Hex Key
2. Phillips Screwdriver x 2
3. Tweezers

![](/files/-MIIRX8XCu67G2UuoYLO)

## 2. Disassemble the cracked case.

### 2.1 Disassemble the black base.

Use an M2.5 Hex Key to unscrew the 6 hex screws.

![](/files/-MIIRdSxTMwTT4PFgMS8)

### 2.2 Disconnect the motor cables, switch wire, and the 5-pin front end signal cable.

![](/files/-MIIRqLEzqQz7mP9p0dl)

![](/files/-MIISrT_5Ck-hTJxNRek)

### 2.3 Disassemble the motherboard PCB.

Use a Phillips driver to unscrew the 4 motherboard screws.

![](/files/-MIISv5Wpw2MrVvivEJy)

![](/files/-MIISxwN8sGdrZzwHVW5)

### 2.4 Disassemble the base encoder board.

![](/files/-MIIT-jaqJaISZHM4DvW)

![](/files/-MIIT25k5Zc6-1nRPhBp)

### 2.5 Disassemble the base reducer.

{% hint style="warning" %}
:brain: **Note:** There are four small screws beside the magnet.
{% endhint %}

![](/files/-MIIT5tN5HUNMP5eFMqq)

![](/files/-MIIT8l-K7dzPga9M9qR)

![](/files/-MIITBer9J9HCJwgLvDk)

That's all to disassemble the base part. Now let's replace the new case.

## 3. Replace the new case.

### 3.1 Replace the base bearing to the new case part.

![](/files/-MIITF6RwHC32j4rq72Y)

### 3.2 Put the motor cables and 5-pin cables through the case.

![](/files/-MIITJicrG38_qCHxUVS)

### 3.3 Assemble the reducer.

Use the Phillips screwdriver to fix 8 screws.

![](/files/-MIITNdefOXwrnpObXPl)

If one of the small screws stick on the magnet, use the tweezers to put it back and screw on.

![](/files/-MIITSHUrs6Bad9cTIor)

![](/files/-MIITUl3FOewUbocFFXK)

### 3.4 Assemble the encoder board.

Assemble the encoder board and connect the short cable to the base motor.

![](/files/-MIITmAKHoh0a_Kb5zNn)

### 3.5 Assemble the motherboard.

![](/files/-MIITqrBuM1DrryTUbz5)

### 3.6 Cable connections.

Connect the #1, #2, #3 cables to the corresponding port and connect the 5-pin cable and the switch wire.

![](/files/-MIIU-6zrYrRENaeHrFu)

![](/files/-MIIU1rm8ezyR-o3nqo-)

{% hint style="warning" %}
:brain: **Note**: be careful and don't break the motherboard.
{% endhint %}

### 3.7 Test your DexArm.

Connect it to Rotrics Studio, move it to the HOME position and test the font cable with your laser module.

### 3.8 Assemble the black base.

![](/files/-MIIU7shiQk9HzBaE7IR)

![](/files/-MIIUAD0tI3JytqfhFfa)

Now you've run through all the replacement steps. Have fun making!