Symptom  Description  Need to confirm  Action 
24
Non-recognition of duplex unit 
Instruct customer to re-set duplex unit and make sure the unit is 
correctly locked. 
if the printer configuration does not include duplex unit, make sure 
the bi-direction communication is enabled.  
As the last, ask customer to turn on the machine. 
25
Cannot turn off the power 
Confirm if "replace ink" is displayed.  Explain if ink is out during printing, printer tries to re-fill ink to sub-
tank. During this time, customer cannot turn off the power. 
 
26
SC 992  Waste Ink tank full Error  Check the total counter.  Dispatch Tech. to replace Waste ink tank. 
27
SC 999  Maintenance Motor out of HP 
Check the paper type. 
Confirm if the other type paper has also skewed image 
or not. 
Ask customer to set paper again. 
Ask customer to set the lever position again. 
29
Confirm if the printing data related or not.  Change to EMF format spool in Driver. 
If printing data related, change to other printing mode. 
30
Uneven image density  Printer optimum value  Confirm if the printer optimum setting is obtained.  Obtain the printer optimum setting with the driver. 
Ask customer to get the printer optimize value. 
(In Printer Driver  - Printer configuration - Adjust color density - 
Obtain printer optimize value) 
    Nozzle blockage  Check the nozzle check pattern by Driver.  If there is nozzle blockage, 
instruct customer to do head cleaning  (Max.  Normal X3, Full X1). 
31
Machine does not power on 
Check the power source. 
Connect the other electric device to check the power source. 
If power source is OK, swap. 
32
 SC 994  Vertical Motor error 
Ask customer to power off and on. 
Ask customer to remove the duplex unit and re-install it. 
If not solved, swap.