AXIOMTEK CEM841 User manual

4 9418D841000E
©Copyright 2015 Axiomtek Co., Ltd.
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
©Copyright 2015 Axiomtek Co., Ltd.
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
©Copyright 2015 Axiomtek Co., Ltd.
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
©Copyright 2015 Axiomtek Co., Ltd.
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.