HP 2420 Service Manual - Page 204
Air-temperature sensor, Reconnect the connector
UPC - 829160289205
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Table 7-8. Interpreting control-panel messages (continued) Control panel message Event Description log error message Recommended action 56.XX ERROR For help press alternates with To continue turn off then on A temporary printing error occurred as a result of an incorrect input or output request. 1. Turn the printer off, and then turn the printer on again. 2. Turn the printer off, and then turn the printer on again. 3. Reinstall all input trays. 4. Reinstall the stacker or stapler/stacker. 5. Remove all non-HP paperhandling devices. 57.XX ERROR For help press alternates with To continue turn off then on A temporary printing error occurred in one of the printer fans. 1. Turn the printer off, and then turn the printer on again. 2. If the message persists, check the printer fans and replace fans as necessary. 58.XX ERROR For help press alternates with To continue turn off then on A memory error has been detected. X Description 2 air-temperature sensor 3 ECU The line voltage and current source at the printer location might need to be inspected to ensure that they meet the electrical specifications for the printer. (See Electrical specifications.) 4 power supply To resolve problems: 1. Turn the printer off, and then turn the printer on again. 58.2 Air-temperature sensor 1. Turn the printer off, and then turn the printer on again. 2. Reconnect the connector between the air-temperature sensor (the bar mounted across the main cooling fan on the left side of the printer) and the power supply (location J63). 3. Replace the fan. 4. Replace the power supply (see Power supply. 58.3 ECU 1. Replace the ECU (see ECU). 58.4 Power supply 1. Replace the power supply (see Power supply. 190 Chapter 7 Troubleshooting ENWW