HP designjet l65500 Manuale Di Servizio

 Troubleshooting

187

13.

Check each FI tower, mainly the black rubber part at the top of the FW tower. Here are 2 examples: 

14.

In case of any FI tower which seems to not work, replace them (refer to chapter 5 for the part num-

ber to order and chapter 6 to replace it). 

15.

Check for each color, that the ink is well arriving at the Printhead: 

•

You need a syringe + needle for each color 

•

Fill the printhead pockets with paper or cloth to prevent spilled ink or dirt from dirtying the Print-

head interconnect contacts. 

•

Insert the needle on the color that you want to test, within the FI tower. The syringe needs to 

have the piston in place (else, when you remove the syringe, there is a high risk to place ink 

around the needle in the carriage). 

•

Run the test '4.12, Ink Pressure At Pen', testing each side of the air pressure pump (selection 

from the tool). Important: let the piston of the syringe in place and do NOT pull it out during the 

test, While running the test, the piston should be raised up slowly. (in some specific case, the 

piston has to be lifted up mainly if the piston is fully pressed down, just need to be raised up 

but then, the piston has to raise up alone. 

1.

Check that the 4 way valves are not leaking in anyway. 

a.

Insert ALL the intermediate tanks. 

b.

Run the diagnostic ‘4.12 Ink Pressure At Pen‘, and select the ink pressurize pump to pressurize 

depending on the empty Intermediate tank. 

- In case it is an intermediate tank x1 which is empty, setup the rear pump (labeled 1 on the 

ISM board) 

- In case it is an intermediate tank x2 which is empty, setup the front pump (labeled 0 on the 

ISM board) 

c.

Let the air pressurized for 5 minutes, and stop the test. Switch off the printer. Is there ink within 

the intermediate tank? If yes, the 4 way-valves must be replaced.