HP 2000CP 2500CP - Manual (Page 42)

System Error Codes 2-7 HP DesignJet CP Series Printers
System Error: 010031
Problem Description: The Printhead Primitive Driver ASIC Test Failed.
Corrective Action: Try the following:
D Make sure that the Trailing Cable is connected
correctly.
D Perform the Carriage Calibration ' page 5-7.
D Replace the Trailing Cable ' page 8-36.
D Replace the Carriage Assembly ' page 8-42.
D Replace the Electronics Module ' page 8-6.
Only replace one component at a time and
check if the error has gone before replacing
another component. Using this procedure
you will be able to determine exactly which
component failed.