COOLER MASTER MASTERBOX Q300L (01) PDF MANUAL

Part Identifier	Description	Quantity
A	Thumbscrews (for side panels)	8
B	Standoff Tool	1
C	Screws (for Motherboard / SSD)	14
D	Screws (for PSU)	6
E	Screws (for HDD)	8
F	Motherboard Standoffs	10

To remove each side panel:

1. Locate the four thumbscrews (A) securing the panel at its corners.

2. Unscrew the four thumbscrews.

3. Gently pull the panel away from the case chassis.

Repeat for the other side panel.

The front, top, and bottom panels feature magnetic dust filters. Simply peel the filters away from the case chassis to remove them for cleaning or component installation.

1. Identify the correct mounting holes in the motherboard tray for your motherboard’s form factor.

2. Screw the required motherboard standoffs (F) into the identified holes.

3. You may use the included standoff tool (B) to help tighten the standoffs.

4. Install your motherboard’s I/O shield (not included with the case) into the rectangular cutout at the rear of the case, ensuring it clicks securely into place.

1. Carefully align the motherboard with the installed standoffs (F) and the I/O shield.

2. Gently lower the motherboard onto the standoffs, ensuring the mounting holes line up.

3. Secure the motherboard to the standoffs using the provided motherboard screws (C).

1. Place the PSU inside the case at the bottom rear.

2. Align the PSU’s mounting holes with the corresponding holes on the back of the case.

3. Secure the PSU from the outside rear of the case using the provided PSU screws (D).

There are two primary locations for installing 2.5″ SSDs:

Option A: Behind Motherboard Tray

1. Align the SSD with the mounting points located on the back side of the motherboard tray.

2. Secure the SSD using four screws (C) inserted from the opposite side of the tray.

Option B: Front Shroud Area

1. Align the SSD with the mounting points on the bracket located near the front, below where the motherboard sits.

2. Secure the SSD using four screws (C).

3.5″ HDDs can be mounted behind the motherboard tray:

1. Align the HDD with the mounting points on the back side of the motherboard tray, typically below the SSD mounting location.

2. Secure the HDD using four screws (E) inserted from the opposite side of the tray.

Rear Fan:

1. Align a 120mm fan with the mounting holes at the rear exhaust area of the case.

2. Secure the fan using appropriate fan screws (not included in the labeled kit).

Front Fans:

1. Remove the front dust filter.

2. Align up to two 120mm or 140mm fans with the mounting holes at the front intake area of the case.

3. Secure the fans using appropriate fan screws (not included in the labeled kit).

1. Align the side panel with the case chassis.

2. Gently push the panel into place.

3. Secure the panel by screwing in the four thumbscrews (A) at the corners.

Repeat for the other side panel.