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Ink jet colour imbalance problem

N

N_Cook

Jan 1, 1970
0
More out of interest what went wrong than necessity as only used for poster
use. Epson Stylus 915, if relevant.
Lack of Red and excess of Yellow
A perfectly adequate get-around is +30 percent of Red and 30 percent less
each of Green and Blue in the graphics package. It all started with a postal
packing foam "doughnut" dropping unnoticed into
the paper entry slot and numerous paper jams before finding the culprit. The
ink-jet cartridges are re-set , re-used/ redilled multiple times and
refilled and reset since this foam business. Built-in "cleaning" and the
other maintainence routine has made no difference. The colour imbalance is
stable and invariant over perhaps 30 sheets and 4 separated sessions.
 
N

N_Cook

Jan 1, 1970
0
Phil Hobbs said:
At a guess, there's some crud on top of a colour-calibration photodiode
somewhere inside.

Cheers

Phil Hobbs


Is that part of the printer hardware? like the auto-exposure photodiode
inside a photocopier? ie not in the ink-jet carts.
Time to explore the innards of one of those junkers in the mule-park, I
think, to get the hang of ink-jet general operation.
 
N

N_Cook

Jan 1, 1970
0
Phil Hobbs said:
At a guess, there's some crud on top of a colour-calibration photodiode
somewhere inside.

Cheers

Phil Hobbs

I worked out how to get to the active jet face.
remove both carts and unclip their top clamps
Remove the ribbon shield, hidden plastic tang and nib at the rear
Undo the 2 obvious screws
lift the subassembly away from the carrier, slight joggling required
no obvious opto device underneath

Cleaned the active face with alcohol and replaced , but no change in colour
balance
At least I've not made it worse (if it ain't broke, don't poke)
 
N

N_Cook

Jan 1, 1970
0
Perhaps its an unintended consequence of doing resets, something stored
erroneously somewhere
 
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