|This file contains the Hardware Maintenance Manual (HMM), March 2012 Edition.
This HMM contains information regarding hardware installation and removal; diagnostics and troubleshooting; hardware interfaces; and service (FRU) part numbers.
Supported ThinkPad systems:
- L420, L421, L520
Released on 23 March 2012
- The Recovery DVD (RDVD) information found in Hardware Maintenance Manual (HMM) is not updated as regularly as the RDVD service part document.
- For the latest RDVD part numbers, please refer to your systems' RDVD service part document instead.