when a customer calls me for copy quality problem, i use exactly what he is trying to run as a test chart. if you fix the problem using his job and he thinks its ok-good enough. if you show a customer a real test chart and try and get the copier perfect then he will expect the same thing every time you go out. sometimes you will just be chasing your tail trying to perfect the copy quality when you can't. don't show the customer too much. most of the time the quality will be close to perfect anyway.
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