HP LaserJet 4250 Service Manual - Page 412
Table 7-37, Table 7-36
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Table 7-36 Blurred print (continued) Possible cause The high-transfer setting is turned off. The line-detail setting is turned off. Recommended action(s) Open the print-quality menu at the control panel (see Print-quality submenu). Select OPTIMIZE and set HIGH TRANSFER=ON. Open the print-quality menu at the control panel (see Print-quality submenu). Select OPTIMIZE and set LINE DETAIL=ON. Table 7-37 Black page Possible cause Recommended action(s) The print cartridge is defective. Replace the print cartridge. The high-voltage connector springs are dirty or damaged. The high-voltage connector springs protrude into the print cartridge cavity. Clean the springs if they are dirty. Replace the springs if they are damaged or missing. The laser-beam drive circuit or highvoltage circuit is defective (not supplying the correct voltage). 1 Check the cables between the dc controller PCA and the highvoltage circuitry (part of the powersupply). 2 If the cables are not connected, connect the cables. 3 If the cables are connected, but the problem persists, replace the power supply. See Power supply. 4 If, after replacing the power supply, the problem persists, replace the dc controller PCA. See Dc controller PCA. The laser/scanner assembly is defective. Replace the laser/scanner assembly. See Laser/scanner assembly. The cables between the laser/scanner Inspect and reseat the connectors. If assembly and the dc controller PCA necessary, replace the cables. are not seated correctly or are defective. 398 7 Troubleshooting