HP Color LaserJet Enterprise CM4540 Service Manual - Page 419

Troubleshooting process Determine the problem source When the product malfunctions or encounters an unexpected situation, the product control panel alerts you to the situation. This section contains a pre-troubleshooting checklist to filter out many possible causes of the problem. A troubleshooting flowchart helps you diagnose the root cause of the problem. The remainder of this chapter provides steps for correcting problems. ● Use the pre-troubleshooting checklist to evaluate the source of the problem and to reduce the number of steps that are required to fix the problem. ● Use the troubleshooting flowchart to pinpoint the root cause of hardware malfunctions. The flowchart guides you to the section of this chapter that contains steps for correcting the malfunction. Before beginning any troubleshooting procedure, check the following issues: ● Are supply items within their rated life? ● Does the configuration page reveal any configuration errors? NOTE: The customer is responsible for checking supplies and for using supplies that are in good condition. Pre-troubleshooting checklist The list below describes basic questions to ask the customer to help quickly define the problem or problems. Table 3-1 Pre-troubleshooting checklist Environment ● Is the product installed on a solid, level surface? ● Is the product exposed to particle matter or dust? ● Is the power-supply voltage within ± 10 volts of the specified power source? ● Is the power supply plug inserted in the product and directly to the wall outlet (not a power strip)? ● Is the operating environment within the specified parameters, as listed in chapter 1 of this manual? ● Is the product exposed to ammonia gas, such as that produced by diazo copiers or office cleaning materials? ● Is the product exposed to direct sunlight? ENWW Troubleshooting process 367