HP LaserJet 5p/mp Service Manual - Page 63

HP LaserJet 5P Printer Service Supplement Troubleshooting Continuable Data Error Light Patterns Possible data error light patterns are listed in the first column of the following table. If the Error and Data lights on the Status Panel are lit, simultaneously press the GO and RESET buttons on the printer to display a secondary light pattern. This secondary light pattern, or data error light pattern, will more precisely describe the problem. Where more than one data error light pattern is possible, corresponding computer messages are listed in the second column. Data Error Computer Light Pattern Message 20 MEM OVERFLOW 21 PRINT OVERRUN Description Recommended Action Too much data, or data too complex. Turn Page Protection ON or to AUTO (can be set within the Remote Control Panel). 2. Add optional memory. 3. Reduce the complexity of the print job. Press GO to resume printing. 22 IO ERROR The computer and printer are not communicating because of improper signal protocols. Indicates a loose cable connection or a bad or poor quality cable. Reseat the cable and make sure you are using a high-quality cable 56