Modern hardware relies on optical sensors (photointerrupters) to know where moving parts are located. If the sensor is dirty or broken, the hardware "blindly" attempts to operate. For safety, the system halts and generates the "61.c4.d3 error" to avoid crashing the mechanics.
If you see the error on a Vita:
Before fixing the problem, you must identify the context. The 61.c4.d3 error manifests differently depending on the platform: 61.c4.d3 error
| Printer series | Likely fix | |----------------|-------------| | HP LaserJet M400/M500 | Firmware reflash via USB | | HP LaserJet Enterprise M600 | Formatter replacement | | HP Color LaserJet 4700/CP4025 | Remove Jetdirect or replace formatter | 61.c4.d3 error