HP designjet l65500 Instruction De Maintenance

 Troubleshooting

185

3.

Look at the supply status part of the service plot 

4.

Check the Pressure sensor level, values should be at least 1000psi (average should be around 

2000-2200 psi). 

5.

Check the calibration of the ink pressure sensor: compare the values mentioned above, under ‘Pres-

sure sensor calibration values’, and check that there are the same as the ones marked on the ink 

pressure sensor boards. In case of any difference, then re-enter the values marked on the ink pres-

sure sensor board within the printer, through the diagnostic menu, 4.11 Ink Pres. Sen. Calib. 

6.

Switch off the printer, through the ON/OFF button. 

7.

Once the printer is off, weight with hand each cartridge each, and check that none of them is about 

to be empty. The difference of weights between each intermediate tank should follow the table of the 

service plot ‘intermediate tank values’, 100% is equivalent to around 1kg. But warning: these values 

are not 100% accurate, the most important: none of the intermediate tank should be about to be 

empty. If it is about to be empty, follow the specific chapter ‘what to do in case of an empty interme-

diate tank’.

 

8.

Place back each intermediate tank at its place. 

9.

In case of any doubt on any tube from the ink pressure till the cartridge, mainly if the customer is 

complaining that ‘the printer is reporting that the printer reports some cartridges as empty while 

there is still some ink within the cartridge’, do not hesitate to re-purge the part ‘ink pressure sensor <-

> cartridge connector. How, for each color that you want to re-purge the corresponding tube: 

•

Printer OFF 

•

Equipment needed: one syringe + tube + flexible needle, and 1 purger bag (the empty bad of 

the cartridge, used during the printer’s installation). 

•

Place the cartridge on a flat surface and turn it four times (rotating it through 360 degrees) as 

indicated on the label, to ensure that the ink is well mixed before use. 

•

Insert a clean syringe into the ink cartridge and fill it with 30 cc of ink for the color selected. 

•

Check that there is no air in the syringe by hitting it a few times. If there is air, hold the syringe 

vertically with the needle up, so that the bubble of air rises to the top. Put a cloth around the 

needle, and press gently on the piston to remove the air from the syringe.