HP LaserJet P4510 Service Manual - Page 256

Table 7-2 Power-on defect or blank display (continued) Problem Action If the fan is not working: 1. Turn the product off and remove the formatter. Disconnect the optional accessories. 2. Turn the product on and check the fan again. If the fan is still not working: 1. Verify that the fan is connected to the power supply (connector J64). 2. Replace the fan. See Fan FN101 on page 200. 3. Replace the power-supply assembly. See High voltage power supply on page 206. 4. Replace the DC controller. See DC controller PCA on page 186. Note: The fan only operates during the initial startup and while printing, and when the temperature inside the product is too high. If the temperature is too high, the fan turns on to cool the inside of the product. The fan works, but the control-panel display is blank. 1. Print an engine test. Engine test on page 244. 2. If the engine test is successful, perform the following steps, in order. ◦ Reseat the control panel and formatter connector. See Control-panel assembly on page 170 and Formatter cover, formatter cage, and formatter PCA on page 150. ◦ Replace the control-panel cable. See Control-panel assembly on page 170. ◦ Replace the control-panel assembly. See Control-panel assembly on page 170. ◦ Replace the formatter. See Formatter cover, formatter cage, and formatter PCA on page 150. 3. If the engine test is not successful, remove the formatter and attempt to perform the engine test again. If the engine test is successful with the formatter removed, replace the formatter. See Formatter cover, formatter cage, and formatter PCA on page 150. If the test is not successful with the formatter removed, replace the DC controller PCA. See DC controller PCA on page 186. 242 Chapter 7 Solve problems ENWW