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4-11

Diagnostic Tests and Utilities

HP Designjet 4000/4020 Printer Series Service Manual

If it is shorter, it means that there is an obstacle blocking the Scan-Axis path

and the Front Panel will display System Error Code 86:11. For more

information on troubleshooting this error code, refer to Page 2-24.

If the length is longer, it means that the carriage has a datum broken or the

Carriage Stopper is not installed and the Front Panel will display System

Error Code 02:10. For more information on troubleshooting this error

code, refer to Page 2-4.

Make sure you keep your hands away from the Print Platen

as the Carriage will be moving at high speed and you could

injure yourself or damage the Carriage Assembly.

12 The Printer will now check the Scan-Axis PWM and the following information

will be displayed on the Front Panel:

 Starting Scan Axis.

 PWM test.

If there is a failure at this point, the Front Panel will display System Error

Code 86:10. For more information on troubleshooting this error code, refer

to Page 2-24.

13 The Printer will test the PWM at 61 ips and display the results on the Front

Panel.

If some of the results are incorrect, the Front Panel will show "High Friction".

Depending on the actual results received, the following should be done:

 If PWM avg got is more than 31160 and PWM min diff got is less

than 3100 then there is high friction along the Scan-Axis. In this case you

should:

– Clean the Slider Rods and Apply Oil along the complete axis of the

Slider Rods. After applying the Oil, perform the test again.

– Check that the Carriage Belt is installed correctly.

 If PWM min diff got is less than 3100 but PWM avg got is less than

31160 then there is a problem in the Scan-Axis. In this case you should:

– Check that the Encoder Strip is clean. If necessary, clean Encoder Strip

using a damp cloth.

– Check that the Ink Supply Tubes and Trailing Cable are installed

correctly.

If there is a failure processing the PWM results, the Front Panel will display

System Error Code 86:11. In this case try repeating the test again.

14 Once the test is completed, OK will be displayed on the Front Panel.

HP 4000 User Manual

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