HP Color LaserJet Enterprise CP4020 Service Manual - Page 385

Table 3-14 Control-panel messages (continued) Description Recommended action 59.63 ERROR Yellow image drum motor rotation error 59.90 ERROR ITB motor startup error 59.A0 ERROR ITB motor rotation error. 59.BO CLEANING MOTOR ERROR REPLACE TONER COLLECTION UNIT The residual-toner feed motor has failed. 59.C0 ERROR Developer alienation motor rotation error Perform the drum-motors component test in the DIAGNOSTICS menu. If the message persists, replace the yellow drum motor. See Yellow, magenta, cyan, and black drum motors on page 199. Reconnect the connector J14 of the ITB motor and the connector J140 on the DC controller PCA. Perform the ITB motor drive component test to verify that the ITB motor is functioning properly. If the message persists, replace the ITB motor. See ITB motor on page 202. Use the component test to activate the ITB motor. If the motor does not function, replace the motor. See ITB motor on page 202. 1. Check the toner collection unit. If the unit is full, replace it. NOTE: Toner can clog the feed motor if the toner collection unit is full. 2. Reconnect the residual-toner feed motor connector J63 and connector J155 on the DC controller PCA. 3. Replace the residual-toner feed motor. See Residual-toner-feed motor on page 133. 1. Reconnect intermediate connector J87 of the developing disengagement sensor, connector J112 on the DC controller PCA, connector J38 of the developing disengagement motor, and the connector J261 on the high-voltage power supply D PCA. 2. Run the sensor test in the sensor monitor mode to verify that the developing disengagement sensor is functioning properly. If it is not, replace the main-drive assembly. See Maindrive assembly on page 203. 3. Run the developing unit disengagement drive test to verify that the disengagement mechanism is functioning properly. If it is not, replace the developing disengagement motor. See Developing-disengagement motor on page 168. ENWW Tools for troubleshooting 353