HP 4300 Service Manual - Page 342
Table 72. Black Possible cause, Recommended actions, Replace the DC controller PCA. See
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Table 72. Black page Possible cause Recommended action(s) The print cartridge is defective. q Replace the print cartridge. The high-voltage connector springs are q The high-voltage connectors protrude into the print cartridge dirty or damaged. cavity. Clean the springs if they are dirty. Replace the springs if they are damaged or missing. The laser beam drive circuit or 1. Check the cables between the DC controller PCA and the high-voltage circuit is defective (it is not high-voltage circuitry (part of the power supply). supplying the correct voltage). 2. Replace the power supply. See "Power supply" on page 188. 3. Replace the DC controller PCA. See "DC controller PCA" on page 181. The laser/scanner assembly is defective q Replace the laser/scanner assembly. See "Laser/scanner (it is turning the laser beam on assembly" on page 173. continuously). Connectors between the laser/scanner q Inspect and reseat the connectors. If necessary, replace the assembly and the DC controller PCA cables. are not seated correctly or are defective. 322 Troubleshooting Q2431-90912
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