No Yellow

if clogged, you first have to determine if its pumps or supply.

first get a syringe hooked up to the pump line that prints yellow. pull the carriage to the side, away from the capping station, and pull a strong vacuum on that pump line. do you feel resistance. there should be none at all.

if so, get a partner to syringe cleaning fluid into the cap while you pull a vacuum on the other side. keep going until the line is clean. if that doesn't do it, get a small wire and feed it up towards the pump. try to free the clog and repeat the vacuum/solution routine. if that doesn't work, take the pump apart a bit and work the clog through the line.

(also keep in mind that many clogs can be directly beneath the cap, right where the tube begins).

on the supply side one way to determine if you have a clog is to remove the damper and pull a strong vacuum. if you don't get a good amount of ink, there might be a clog. also pulling on a vacuum and having the damper stay concaved after the syringe is removed is a sign of resistance in that line. you can also feed a wire way down that ink tube to clear a clog. or simply put and cleaning cart on that line and pull solution through it (damper off).

 

Chances are you have a bad cap top.. With the heads in the parked position, try to pull a vacuum on the line coming from the yellow head. If you suck air, you have a bad cap. Replace with a new and you should be good to go.

 

one other thing. to determine if you've got bad vacuum to the yellow. you can do pump tube swaps.

 

have you determined that you have easy flow from your yellow line. i wouldn't start in on the pump side before you know that you've got no issues with supply.

also, just swap a damper position. (put the yellow damper/line on a spot that is flowing fine and put the removed damper/line in the yellow position). do a head clean (look for yellow ink coming down your pump tubes.)

report back on how the color are flowing/vacuuming with the new damper/color positions.

 

if it's a fitting, there's no danger of taking that a part. the only danger is letting yellow continue to sit in that head further complicating your repair.

start taking that machine apart. but before that, do a head soak on the yellow so you don't have other issues.

 

well each printer has it's own different fittings. these are compression fittings. so, the moment it seems to just be free spinning you then have to forcefully pull the tube away from the union or whatever it's plugged into. just like taking off a damper.

and yes. get some fluid to the yellow head (cap soak).

 

PM sent to call regarding this.