HP designjet l65500 Manuale Di Servizio

190

Troubleshooting

1.

Check the dynamic pressure while refilling an intermediate tank

•

If not already done, perform the steps 1-11 described at the beginning of the ‘How to check the 

Ink Delivery System’ see page 184.

•

In case you have also the corresponding intermediate cartridge which is empty, the line 

between the cartridge and the ink pressure sensor might be blocked, use the following proce-

dure to check it:

a.

Reboot the printer in diagnostic

b.

The intermediate tank connected to the corresponding color with the problem must almost 

be empty (can be one or both cartridges).

c.

IMPORTANT: Disconnect the two intermediate tanks from the other color (in order to 

ensure that the intermediate tank bag can be inflated/refilled).

d.

Perform the test 4.15.9, Ink Pressure Sens and check the value (should be around 2000-

2400), refer to page 334.

e.

Open the main electrovalve of the color showing the problem, use procedure 4.15.2 

Open electrovalve, refer to page 331.

f.

The intermediate tank will start to refill.

g.

Check again the ink pressure sensor value, through 4.15.9 Ink Pressure Sens (while the 

electrovalve is open), refer to page 334.

2.

If the value displays step d is less than 1000, or even 500, this would indicate that there is a block-

age in the line between the cartridge and the ink pressure sensor.

What is happening: when the ink flow is very small (but still happening), the difference of pressure 

between electrovalve closed (static pressure) and electrovalve opened (dynamic pressure) is much 

higher than a normal ink flow.

What can prevent a good ink flow between the cartridge and the ink pressure sensor?

•

Air bubble (which was not removed in previous steps: How to check the Ink Delivery System, 

see page 184).

•

A defective cartridge can be confirmed by using another cartridge.

•

Defective cartridge connector => need to order this connector (coming with the ink tube down 

to the ISM ink tray).

The same test can be run with 1 intermediate tank connected, the other or both intermediate tanks 

are connected (while reading the 4.15.9, Ink Pressure Sens while the main electrovalve is open, you 

can connect or disconnect the intermediate tank. What is important is to have the ink level within the 

intermediate tank less than half full, if they are full of ink, you will not detect any issue with the 

dynamic ink pressure).

3.

The level of ink remaining within the cartridge is as expected