HP M5025 Service Manual - Page 456

Table 6-2 Control-panel messages (continued) Control panel message Description NOTE 54.XX ERROR errors are usually related to toner and print cartridge sensor problems. Recommended action 3. Make sure that you are not using a refilled HP print cartridge. 4. Replace the printer cartridge. 55.XX DC CONTROLLER ERROR To continue turn off then on XX ● 18 = black toner level sensor malfunction The print engine is not communicating with Turn the device off, and then turn the device the formatter. on. XX ● 00 = communication error ● 01 = dc controller memory error ● 01 incoming parity error ● 02 = outgoing parity order ● 03 = no engine response ● 04 = communications timeout ● 06 = dc controller NVRAM abnormal read/write or not accessible Reseat all connectors on the dc controller and the formatter. Reseat the formatter. Check with HP support to find out if an applicable RFU is available. If it is, perform a RFU. If the error persists, replace the dc controller. See DC controller PCA on page 357. If the error persists, replace the formatter. See Formatter cover and cage on page 199. NOTE Check the Event log to distinguish between the two 55.01 errors above. 56.XX ERROR To continue turn off then on A temporary printing error has occurred. 1. ● 56.01 = unknown input device, selected media input unavailable 2. ● 56.02 = unknown output device, selected media output bin unavailable Turn the device off, and then turn the device on. For 56.01 errors, check the connections to the input device (optional 1 x 500- or 3 x 500-sheet feeder.) For 56.02 errors, check the connections to the optional stapler stacker. 3. Remove all non-HP paper-handling devices. 4. Perform a RFU. 426 Chapter 6 Troubleshooting ENWW