HP Color LaserJet CP6015 Printer series - Manual (Page 171)

Install memory
You can install more memory for the product by adding a dual inline memory module (DIMM).
CAUTION: Static electricity can damage DIMMs. When handling DIMMs, either wear an antistatic
wrist strap, or frequently touch the surface of the DIMM antistatic package and then touch bare metal
on the product.
Install DDR memory DIMMs
1. Turn the product off.
2. Disconnect all power and interface cables.
ENWW Replace supplies 157