HP DesignJet Z2100 - 86:01; 87:YZ; 93:YZ

System Error Codes
2-24 Designjet Z Series — Service Manual
Sensor  Page 6-178.
 If the System Error continues, replace the Main PCA  Page 6-163.
System Error: 86:01
Problem
Description:
Problem moving the carriage, most likely due to a paper jam.
Corrective Action: Try the following:
 Switch the Power OFF from the back of the Printer and disconnect the
Power cord. Reconnect the power cord and power On the Printer.
 Open the Window and check for any visible obstacles restricting the
movement of the carriage. If there is a wrinkled mass of media inside the
paper path, lift the Pinch wheels (using the Media Lever) and clear the
obstruction.
 If there is no paper jam or obstacle blocking the carriage movement
perform the following:
– Clean the encoder strip.
– Check the belt assembly.
– All cables and connections between the Carriag PCA, Scan Axis
Motor, and Main PCA.
– Oil the carriage rails.
 Perform the Scan Axis Diagnostic Test  Page 3-6.
 If the diagnostic test does not find any specific error, replace the Carriage
Assembly 
Page 6-100.
 Replace the Belt Assembly  Page 6-115.
 Replace the Scan Axis Motor  Page 6-116.
 Replace the Main PCA  Page 6-163.
System Error: 87:YZ
Problem
Description:
Problem finding the Scan-axis encoder reading.
Corrective Action: Try the following:
 Upgrade the firmware.
 Clean the Encoder Strip.
 Replace the Encoder Strip  Page 6-91.
 Replace the Carriage PCA  Page 6-138.
 Replace the Trailing Cables  Page 6-92.
System Error: 93:YZ
Problem
Description:
Unable to pressurize the Ink Delivery System. The ISS Motor does not move
as expected.
Corrective Action: Try the following:
 Switch the Power OFF from the back of the Printer and disconnect the
Power cord. Reconnect the power cord and power On the Printer.
 Perform the Ink Delivery System diagnostic test to further troubleshoot the