artbot
New Member
long story (skip below line for short version)
recently i decided to put my jv3 160sp in CMYKx2 mode. i needed to change out the #4 head (it was a proxy head. running dormant). i mostly print from the black channel. so i bought a new head, installed the old black head in the yellow #4 position. and put the new head in the black #1 position.
i have changed a lot of heads. done it about 50 times over the last 12 years. but never a brand new $825 dx4 (done plenty of refurbed dx4's). so i was painfully cautious. like handling a nuclear bomb as not to mess the head up in any way. turned off on front, off on back, unplugged, pressed front button four times. even went barefoot and kept left hand grounded to the platen. electrostatic damage to the head during install is an impossibility at this point.
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put in the new head. the test print was fine except for one or two nozzles that seemed to be coming and going. i figure that would clear up as soon as the head got some use. it was late, turned off the printer. would finish the next day.
Morning: i decide to do the allignment and callibrations to the heads. i wasn't able to yesterday because i had to convert the printer back to a roll feed printer from a flatbed.
i entered the head id#. and just to see how out of alignment the head was i printed a file. there was overspray everywhere coming from the black. i then ran a grayscale print that only used the black head. the odd thing is that the head does fine when printing dark colors. but when printing blacks at low values (20's) the over spray is very very bad.
i then did a data swap to see if there was something wrong with the slider or main board. the print came out fine printing at the #2 magenta. see the attachment. it's a grayscale/black data only file going to the magenta head.
i figured maybe the printer has sat too long and the black ink might be bad? so i did a damper swap. magenta ink oversprayed wildly at the black #1 print head.
has anyone seen anything like this? the overspray is insane. and from a brand new head. test print is sharp. callibration prints are perfect. only happens in light coverage.
my worst fears of installing a brand new head have come true. i think i have a bad head with no warranty!
recently i decided to put my jv3 160sp in CMYKx2 mode. i needed to change out the #4 head (it was a proxy head. running dormant). i mostly print from the black channel. so i bought a new head, installed the old black head in the yellow #4 position. and put the new head in the black #1 position.
i have changed a lot of heads. done it about 50 times over the last 12 years. but never a brand new $825 dx4 (done plenty of refurbed dx4's). so i was painfully cautious. like handling a nuclear bomb as not to mess the head up in any way. turned off on front, off on back, unplugged, pressed front button four times. even went barefoot and kept left hand grounded to the platen. electrostatic damage to the head during install is an impossibility at this point.
_________________
put in the new head. the test print was fine except for one or two nozzles that seemed to be coming and going. i figure that would clear up as soon as the head got some use. it was late, turned off the printer. would finish the next day.
Morning: i decide to do the allignment and callibrations to the heads. i wasn't able to yesterday because i had to convert the printer back to a roll feed printer from a flatbed.
i entered the head id#. and just to see how out of alignment the head was i printed a file. there was overspray everywhere coming from the black. i then ran a grayscale print that only used the black head. the odd thing is that the head does fine when printing dark colors. but when printing blacks at low values (20's) the over spray is very very bad.
i then did a data swap to see if there was something wrong with the slider or main board. the print came out fine printing at the #2 magenta. see the attachment. it's a grayscale/black data only file going to the magenta head.
i figured maybe the printer has sat too long and the black ink might be bad? so i did a damper swap. magenta ink oversprayed wildly at the black #1 print head.
has anyone seen anything like this? the overspray is insane. and from a brand new head. test print is sharp. callibration prints are perfect. only happens in light coverage.
my worst fears of installing a brand new head have come true. i think i have a bad head with no warranty!
