Lenovo ThinkSystem SD550 V3 User Manual page 289

Step 5. Remove the PSU cage from the chassis (see
Step 6. Remove the chassis midplane from the PSU cage (see
69).
Step 7. Remove the left and right EIA brackets from the chassis (see
chassis " on page
After disassembling the chassis, recycle the units in compliance with local regulations.
58).
"Remove the PSU cage" on page
"Remove the chassis midplane" on page
"Remove the EIA brackets from the
Appendix A. Hardware disassembling for recycle
66).
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