HP LaserJet Enterprise 500 Maintenance Manual - Page 55
Power Supply Voltage.
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List of Messages Message PRINTER HOT PROTECTED INSTR* PWR SUPP VOLT* RESTORING BOOT CODE RIB INVLD CMD* Table 2. Message List Explanation Solution This message indicates internal temperatures over 60° Celsius (140° Fahrenheit). Print jobs will not create such temperatures, so immediately determine that the fans are operating and that all air vents are unobstructed. It is crucial that the exhaust vents on the floor of the cabinet remain unblocked, since hot air from inside the printer is vented through the cabinet floor. Nothing must be stored under the printer. Then check the operating environment. A severe environment is one with an ambient temperature at or above 40° Celsius (104° Fahrenheit) or is dirty enough to create blockage of the cabinet fan vents. The printer must never be run at ambient temperatures greater than 40° Celsius (104° Fahrenheit). If the printer is located in such an environment, relocate it to a cooler, cleaner area. 1. CMX controller board sensors report high temperatures on the board. Inspect printer environment for severity. Advise the user to move the printer to cooler, cleaner location. 2. Power off the printer. Remove the paper path or pedestal top cover. Check that all fan cables are connected. 3. Inspect vents and fan airways for obstructions. Look underneath cabinet models for items blocking the cabinet exhaust vents. Remove any obstructions from vents and airways. 4. Install paper path or pedestal top cover. Load paper. Power on the printer. Run the "All Black" print test for 1/4 page. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. Protected Instruction. Firmware error on the CMX controller board. 1. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. Power Supply Voltage. The power supply has failed. Replace the power supply board. Normal download initialization message. No action required. Ribbon Invalid Command. Firmware error on the CMX controller board. 1. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. 55
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