> 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!


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://manual.rotrics.com/faq-troubleshooting/troubleshooting/cracked-case.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.