| 1150-7968 | Wireless PC board assembly - Embedded |
| B5L28-67902 | Internal USB Ports |
| B5L29-60001 | SATA riser PC board PCA-SATA Riser Module |
| B5L46-67909 | Formatter (main logic) PC board assembly - For teh LaserJet M577n/dn/x |
| B5L46-67911 | Formatter (main logic) PC board assembly - For teh Laserjet M577n/dn/x (India) |
| RM2-7122-000CN | Lower high voltage power supply (HVPS) (D) PC board assembly |
| RM2-7123-000CN | Upper high voltage power supply (HVPS) (T) PC board assembly - For duplex models only |
| RM2-7125-000CN | Fuser power supply PC board assembly. Fuser Power Supply PCA Assy HP LaserJet M577 M552 M553 |
| RM2-7130-000CN | Waste toner detect PC board assembly |
| RM2-7133-000CN | Switch (SW4) PC board assembly |
| RM2-7138-000CN | Memory PC board assembly |
| RM2-7139-000CN | 550-sheet feeder paper feed tray drive PC board assembly |
| RM2-7154-000CN | Environmental sensor PC board assembly |
| RM2-7156-000CN | Connecting PC board assembly |
| RM2-7157-000CN | Estrangement detect sensor (SR5) PC board assembly |
| RM2-7168-000CN | Pre-exposure PC board assembly |
| RM2-7169-000CN | Pre-exposure PC board assembly |
| RM2-7187-000CN | DC Controller PC board assembly - For the LaserJet M577 printer series |
| RM3-7451-000CN | Dc Controller Pcb Assy |
| T3U55-60001 | PCA-SATA Riser Module |