Acer Aspire E1-421 Service Manual page 144

4. Tighten four (4) captive screws (A) in numerical order from one (1) to four (4) to
mainboard (Figure 3-64). Ensure the thermal module is properly aligned and seated.
5. Connect the thermal fan cable to mainboard connector (C) (Figure 3-64).
3-58 Machine Maintenance Procedures