HP 1050c Service Manual - Page 18
The Printer Continuously Rejects Printheads, Cover Sensors are not Working, The Line Sensor has - carriage assembly
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Troubleshooting The Printer Continuously Rejects Printheads 1 Clean the flex contacts on the Printhead and in the Carriage Assembly using the Carriage Interconnect Wiper (Refer to Chapter 3) and try again. 2 If ALL the Printheads are rejected (the status message on the Front Panel does NOT show "OK" for all the Printheads) then perform the Electronic Systems Test ⇒ Page 4-5. Cover Sensors are not Working 1 Check if the faulty sensor is installed correctly. 2 Check if the cable for the faulty sensor is connected correctly. 3 Replace the faulty Sensor. The Line Sensor has Problems Detecting Media 1 Check the type of media that is being used since the Line sensor may have problems detecting transparent media or some types of Non-HP media. Try loading white HP media in to the Printer and check if the Line sensor detects it. 2 Excessive ink deposits on the Platen surface can fool the sensor by reflecting the light. Clean the Platen. 3 The Line Sensor is not calibrated correctly. Perform the Line Sensor calibration ⇒ Page 5-9. 4 The Line Sensor is damaged or faulty. Replace the Carriage Assembly ⇒ Page 8-44. 1-6 HP DesignJets 1050C and 1055CM Printers Service Manual