HP designjet l65500 Manuale Di Servizio

 Troubleshooting

195

Place some water with soap in the place where the air leakage seems to come (on all the spindle if you 

do not know), pressurize, and check the bubbles forming: where the air leakage is coming, some bubble 

will be formed where the air leakage is coming from the black rubber. 

1.

In any case, the air pressure has to be checked. If it is lower than 5 bars (70psi), poten-

tially there will be an air leakage mainly from the valve (the middle of the air valve) as the valve will 

not have enough air pressure inside the spindle to close properly. The air pressure HAS to be 

2.

If the leakage is coming from the metal parts towards the end/extremity. 

The leakage from the rubber parts, we found that there was a risk to have one metal part that started 

to move freely. There is a way to place it back. 

Opposite to side valve

The drawings are the new valve design which will fix this issue. 

On the previous manufactured part, the part #9 and #14 did not have a 90 degrees angle part, there 

were flat, and then can start to move freely laterally. When these flat metal part begin to not be straight 

under the screw #7, they are no longer secure and the assembly may start to leak. 

In the new design, also the screws #7 will be better maintained (better control of the force when placing 

it + potential addition of locktite) + specific better leakage tests have been implemented. 

For those units which currently are affected, perform the following steps: