General Troubleshooting
Solving Print Quality Problems
Whenever a Print Quality problem appears, it is advisable to print the Diagnostic Print to help diagnose the problem. The Diagnostic Print will help you differentiate between possible printhead errors and other problems such as incorrect
The Front Panel is blank
1See What to do if the Front Panel is blank on page
The Printer does not Power ON
1Check that the power cord is connected correctly to the Printer and to the Power Socket.
2Check that the Power Switch on the BACK of the Printer is in the ON position.
3Check to see the LED on the Front Panel Power Switch are On.
4Check that the
5Replace the Power Supply Unit. See Starwheel Assembly on page
The Printer Continuously Rejects Printheads
1Clean the flex contacts on the Printhead and in the Carriage Assembly using the Carriage Interconnect Wiper and try again. See Flex Contacts Cleaning Tool on page
2If ALL the Printheads are rejected (the status message on the Front Panel does NOT show "OK" for ALL the Printheads) then perform the Electronic Module Test. See 3. Electronics Module on page
Cover Sensors are not Working
1Perform the Sensors Test. See 5. Sensors on page
2Check if the cable for the faulty sensor is not damaged and is connected correctly.
3Replace the faulty Sensor.
The Line Sensor has Problems Detecting Media
1Check the type of media that is being used since the Line sensor may have problems detecting transparent media or some types of
2The Line Sensor is not calibrated correctly. Perform the Line Sensor Calibration. See Line Sensor Calibration on page
3The Line Sensor is damaged or faulty. Replace the Line Sensor. See Line Sensor (T1120/T1120ps) on page
HP Designjet T Series — Service Manual |