You need only to remove the rear panel to replace the DRAM, power supply, I/O adapter, and certain components. To remove the rear panel, first verify that the power source to the HMI-640S has been discon- nected. Then remove the six screws on the rear panel and pull it away from the HMI-640S main body.

Chapter 3 Maintenance

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Advantech HMI-640S user manual Maintenance
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