H700 leaking magenta/losing pressure going left

[artbot]

i have an issue. (deadlines for monday and now the printer wants to act up!)

my daytona (aka rastek H700) is leaking magenta heavily. i noticed that each time the head carriage goes to the left the negative pressure
drops out then regains itself going back to the right.

no other colors are leaking. so is the leak causing the negative pressure to fall off? or is the negative pressure causing the magenta to leak?
(i'm assuming the magenta is the cause of the negative pressure issue because no other colors are leaking).

PLEASE HELP!

 

[Kaiser]

i have an issue. (deadlines for monday and now the printer wants to act up!)

my daytona (aka rastek H700) is leaking magenta heavily. i noticed that each time the head carriage goes to the left the negative pressure
drops out then regains itself going back to the right.

no other colors are leaking. so is the leak causing the negative pressure to fall off? or is the negative pressure causing the magenta to leak?
(i'm assuming the magenta is the cause of the negative pressure issue because no other colors are leaking).

PLEASE HELP!

What route does the magenta line from secondary to overflow take?
Are any lines pinched on the Igus?
What about the brackets on the actual head to secondary tank? Are they loose? Did you have any dropout issues within the past month or so?


I can only see this as having some sort of issue around this area as it is only magenta.
What about magenta head temp?

strange enough that its magenta. I have read that the actual viscosity is lower with this pigment. Ive had issues with magenta mainly in the past too on the T1000.

 

[artbot]

i'll take a look at these areas and check the temp. also need to confirm if it is one head or both. my magenta heads were printing better than any of the heads. then a few days back printing black outlines for stencils on styrene, i noticed the leak very profoundly start with no minor warnings.

thanks.
aa

 

[Kaiser]

i'll take a look at these areas and check the temp. also need to confirm if it is one head or both. my magenta heads were printing better than any of the heads. then a few days back printing black outlines for stencils on styrene, i noticed the leak very profoundly start with no minor warnings.

thanks.
aa

Check your air solenoids/valves.

 

[artbot]

update:

1- it does not leak when parked at the left. but with the machine off, while moving the head carriage, it does leak. predominantly from the back M head, a little from the front M head.

2- the pump sustains a constant hum throughout sending prints and when at rest

3- when setting the neg' pressure to -2.5 it clips (light on the reader blinks) will not sustain a neg' pressure higher than -2.1 without clipping

4- when printing the negative pressure drops quickly and has difficulty maintaining -.1

5- all of the lines seem to be tightly pressed into the heads.

6- overflow tanks were empty (white secondary is gummed up, unused and not maintained by the former owner, needs rebuilding)

when ruling in or out the secondary tank leak. what is the most likely line to clamp?

 

[artbot]

Getting somewhere?

i think i've got a clue to what's going on. the pressure drops as specific points on the gantry. i've attached photos to show this. i'm assuming that some thing is pulling within the cable assembly or
maybe on the head carriage that at these positions opens up a leak or pinches off my air line causing a drop in pressure thus dumping ink.

has anyone experienced any specific gantry position related leaks pinch points? i'm going to turn on the printer, set the carriage to a point where it is at zero, then poke around keeping an eye on the pressure reading.

aa

 

[artbot]

Found it!

i found it! i had a crack in the air line. it seems to be getting old and brittle. i put some "GOOP" glue with a tiny strip of t-shirt material to hopefully seal it up.

BELOW IS A CUT/PASTE FROM

@banners2go

he's been crucial over the last months helping me get this printer set up. thank you!

+++

Everything is fixable it is just finding the cause. Make sure all the lines are pushed in nice and tight on all the print heads. Then lets see if it is a leak. When your machine is off will the print heads drip ink? It can take hours for the heads to start to drip. When we had a dripping problem it was our secondary ink tank. It had a pin hole in it somewhere so we had to replace the whole thing. We had to clamp off all the ink lines before then after to see where the leak was. You may even have to clamp off the air lines. Now remember if it is a leak it doesn't mean it is just a magenta line. It could be any of them but the magenta may leak first. When your machine is off move the carriage back and forth many times to see if it may drip. Leave some material there so you don't have the same nightmare with the table again. If it doesn't do it when the machine is off I wouldn't think there is a leak anywhere.
Second thing. When you are getting ready to print something put your hand on the negative pressure pump (in the far left cabinet of the machine) to see if it goes on or off when you send a job to print. \
Check all of your overflow tanks and make sure they are empty.
Your negative pressure should be around -2.4. Have you tried turning it up to maybe -2.5 or -2.6?
If I can think of anything else I will let you know.
Marc

3- when setting the neg' pressure to -2.5 it clips (light on the reader blinks) will not sustain a neg' pressure higher than -2.1 without clipping Have you changed the settings on it for the limits? I messed mine up one time and had to fix it.

4- when printing the negative pressure drops quickly and has difficulty maintaining -.1 so there is a nice leak

when ruling in or out the secondary tank leak. what is the most likely line to clamp? I would clamp the line above the head right above the y valve and below the last chance filter. You have to do this for all 5 lines.
If it drips when machine is off and you moving it then the leak is below that point and probably inside the head. Have you taken a head apart? The ink line goes all the way inside and attaches to the printhead near the bottom. It could be leaking down there. If they don't leak when clamping there then your leak is above that. and continue your way up the line to the other side of the secondary tank.
before you do any of this when the machine is on and sitting in home position start to manually move it to the right and see at what point the pressure changes. there might be an air line hitting something. You can disconnect all of your fans keep the lamps off, turn off the table suction and you might be able to hear something if it is an air line.
Let me know
One last thing, have you had any low ink alarms when turning the machine on in the morning?
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