HP M5025 Service Manual - Page 421

Troubleshooting flowchart If the device is not responding correctly, use the flowchart to determine the problem. If the device does not pass a step, follow the corresponding troubleshooting suggestions. Power-on self diagnostic tests When the power is turned on, the MFP initiates several formatter self tests. During the self tests, the control-panel LEDs (Ready, Data, and Attention) will illuminate on and off. When the self test are complete and the MFP is ready, all of the LEDs remain illuminated. If during the self test the LEDs stop illuminating (in any combination of on and off states, see Table 6-1 Control-panel LED cycles on page 391) and the control panel is blank there might be a problem with the formatter. Try the following: Table 6-1 Control-panel LED cycles Cycle 1 2 3 4 5 6 7 Ready Off On Off On Off On Off Data Off Off On On Off Off On Attention Off Off Off Off On On On 1. Turn the power off. 2. Remove the formatter, and then reinstall it. Make sure that the formatter is fully seated onto the connectors. See Formatter cover and cage on page 199 and Formatter cage does not properly seat on page 566. 3. If a memory DIMM is installed, remove it. 4. Make sure that the wire harness connectors at the control-panel display and the dc controller are fully seated. 5. Turn the power on. 6. If the problem persists, replace the formatter. See Formatter cover and cage on page 199. NOTE If the formatter successfully completes the power-on self diagnostic tests, it is very likely that the formatter hardware does not need to be replaced. Step 1: Does READY appear on the control-panel display? YES Go to step 2. NO ENWW Troubleshooting flowchart 391