AXIOMTEK CEM841 User manual

4 9418D841000E

Version A1 March 2015

Printed in Taiwan

Quick Start

The basic procedures required to power on CEM841:

(1). Require +12V DC power at minimum 2.5A. Make sure the power is

OFF before connecting the CEM841.

(2). Check to ensure the onboard switch SW1-1 is set to default (OFF

position).

(3). Firmly install DDR3L SO-DIMM into DIMM2 (for single memory

channel configuration) or both DIMM2 and DIMM1 (for dual memory

channel configuration, make sure both memory modules are of the

same size, chip width, density and rank) until fully seated.

Note: It must be DDR3L memory module.

(4). Attach heatsink to the CEM841, refer to section Installing Heatsink.

(5). Install the CEM841 onto COM ExpressTM baseboard, for example,

CEB94000 baseboard.

(6). Properly install all necessary peripheral devices such as hard disk,

display, keyboard and etc. to the baseboard.

(7). Firmly attach power supply to baseboard’s power connector.

(8). Turn on the system power.

(9). Press power button on the baseboard to start CEM841.

CEM841 Quick Installation Guide

9418D841000E 1

Version A1 March 2015

Printed in Taiwan

Checklist

CEM841 Board x1 Product Information CD x1

Quick Installation Guide x1

Note: Please contact your local vendors if any damaged or missing items. DO

NOT apply power to the board if there is any damaged component.

Please refer to the product information CD for the complete user’s

manual, drivers and utilities. User’s manual and related documents are

in Acrobat PDF format.

Board Layout

Top View

CEM841 COM ExpressTM Type 2 Basic Module

2 9418D841000E

Version A1 March 2015

Printed in Taiwan

Bottom View

Switch Settings

Before applying power to the CEM841, please make sure all of the switches

are in factory default positions.

Switch Description Setting

Auto Power On

Default: Disable SW1-1 OFF

SW1 Restore BIOS Optimal Defaults

Default: Normal Operation SW1-2 OFF

SW2 PATA Device Setting

Default: Disable SW2-2 OFF

Connectors

Connector Description

DIMM1 Channel 1 DDR3L SO-DIMM Socket

DIMM2 Channel 0 DDR3L SO-DIMM Socket

SS1 COM ExpressTM Connector

SS2 COM ExpressTM Connector

9418D841000E 3

Version A1 March 2015

Printed in Taiwan

Installing Heatsink

For thermal dissipation, a thermal solution enables the CEM841’s

components to dissipate heat efficiently. All heat generating components

are thermally conducted to the heatsink in order to avoid hot spots. Figure

below illustrates how to install the thermal solution on CEM841.

1. There is a protective plastic covering on the thermal pads. This must be

removed before the heatspreader can be mounted.

2. Each thermal solution is designed for a specific CEM module. The

thermal pads on the heatspreader are designed to make contact with

the necessary components on the CEM module. When mounting the

heatspreader you must make sure that the thermal pads on the

heatspreader make complete contact (no space between thermal pad

and component) with the corresponding components on the CEM

module. This is especially critical for CEM modules that have higher

CPU speeds (for example 1.46GHz or more) to ensure that the

heatspreader acts as a proper thermal interface for cooling solutions.

3. Before installing the heatspreader to the CPU module, please apply

thermal grease on the CPU die. This CPU module has four assembly

holes for installing heatspreader plate. Use the four screws to secure

the heatspreader plate to the CEM841. Be careful not to over-tighten

the screws. Then, apply thermal grease at the bottom of heatsink and

secure the heatsink on the heatspreader by another four screws.

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