Locating Parts On The System Board - Lenovo ThinkCentre M90 Hardware Maintenance Manual

Figure 41. Component locations
1
Hard disk drive (installed in some models)
2
Heat sink
3
Internal speaker (installed in some models)
4
System fan assembly

Locating parts on the system board

Figure 42 "System board parts locations" on page 105 shows the locations of the parts on the system board.
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ThinkCentre Hardware Maintenance Manual
5
Optical drive
6
Memory module
7
Power supply assembly