HP LaserJet P4510 Service Manual - Page 258

The heartbeat LED will perform the following sequences: 1. The LED blinks every four seconds with the power on. 2. If the light is not blinking, check the following: ◦ Reseat the formatter cage. ◦ Replace the memory. ◦ Replace the formatter. 3. If the control panel display does not illuminate, perform an engine test to check the engine (see Engine test on page 244). You must have paper loaded in Tray 2 for the engine test. Formatter test To check that the formatter is working, print a configuration page. 1. Press Menu . 2. Press the down arrow to highlight INFORMATION, and then press OK. 3. Press the down arrow to highlight PRINT CONFIGURATION, and then press OK. Engine diagnostics Engine test To verify that the product engine (all product components except the formatter, formatter DIMMs, EIO products, and the stacker or stapler/stacker) is functioning, print an engine-test page. Use a small, non-metallic, pointed object to depress the test-page switch, which is accessible through a slot in the right-side cover. Figure 7-1 Engine-test-page switch The test page should have a series of horizontal lines. The test page prints from the last tray that you printed from. However, if the product has been turned off and then on again since the most recent print job, the page will print from Tray 2. The product will not print a test page if it is in PowerSave or Sleep mode. NOTE: A damaged formatter might interfere with the engine test. If the engine-test page does not print, try removing the formatter and performing the engine test again. If the engine test is then successful, the problem is almost certainly with the formatter, the control panel, or the cable that connects them. 244 Chapter 7 Solve problems ENWW