HP 2420 Service Manual - Page 203
Dimm Slot <x>, Xy.zz Check Ram
UPC - 829160289205
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Table 7-8. Interpreting control-panel messages (continued) Control panel message Event Description log error message Recommended action 52.XY ERROR For help press alternates with To continue turn off then on A temporary printing error occurred. 1. Press the SELECT ( ) button to continue. 2. Turn the printer off, and then turn the printer on again. 3. Reseat the connectors between the laser/scanner and ECU (J83 and J84). 4. Replace the laser/scanner assembly (see Laser/scanner. 5. Replace the ECU (see ECU). 53.XY.ZZ CHECK RAM DIMM SLOT alternates with To continue turn off then on A problem exists in the printer memory. The DIMM that caused the error will not be used. You will be prompted to press (SELECT button) to continue in the following cases: ● 1 or 2 DIMMs where the only error is ZZ=04 ● 2 DIMMs where one is good and the other has an error with ZZ=01, 02, 03, or 05 ● 2 DIMMs where one has an error with ZZ=04 and the other has an error with ZZ=01, 02, 03, or 05 Values of X and Y are as follows: ● X = DIMM type, 1 = RAM ● Y = Device location, 0 = Internal memory (RAM), 1 or 2 = DIMM slot 1 or 2 If the message continues, you might need to replace the specified DIMM. Turn the printer off, and then replace the DIMM that caused the error. 54.XX ERROR alternates with To continue turn off then on This message is typically related to a sensor issue. Turn the printer off, and then turn the printer on again. If the message persists, check the sensors in the printer to verify that they are working correctly. 55.XX.YY DC CONTROLLER ERROR alternates with To continue turn off then on A temporary printing error occurred. 1. Turn the printer off, and then turn the printer on again. 2. If the message persists, replace the ECU (see ECU). 3. If, after replacing the ECU, the message persists, replace the power supply (Power supply). ENWW Understanding printer messages 189