I have a Sharp MX-C402sc that is giving me light copies and prints very intermittently. the copier is 4 1/2 years old 410,000 copies. it has the latest firmware, it was sold new by us and all the maintenance has been done on time, OEM Sharp toner. it has new black developer and drum. Customer complaint was that it would randomly print out copies that were extremely light. Customer had samples, and it did not matter if it was a print job, through the ADF or off the glass. I was unable to duplicate on site, it was brought into the shop and only once printed out an unreadable copy. I swapped out every consumable part and could not get it to cause any more problems. We took it back and it worked great for 8 days and then started have the same problem again. It was in the shop for two weeks while they had another c402sc loaner which had no problems. Any ideas would be helpful, as they want me to bring the loaner back.
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