Advantech HMI-640S User Manual page 33

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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