Our beleaguered C451 started to display two faults with K prints lately, and I'm trying to figure out what's up. (I'm not a tech, but we're a poor non-profit so I end up doing light tech stuff)
The first problem is persistent, and it's a line on K in the print direction:
bw_stripe.jpg
I'm looking through the service manual and the stripes seem to match the error described below. [p 709]
Skärmavbild 2019-04-02 kl. 15.48.03.jpg
I've done steps 2-5 as far as I can (haven't measured over the contact terminals, but everything looks fine afaik). There doesn't seem to be an electrostatic charger wire for K, so I skipped that.
Haven't gotten to the PH unit yet as the cleaning jig is missing, but thought I'd check with you folks to see if there's anything else I can try except getting a cleaning jig, before giving up and giving a tech a call.
The second problem is intermittent and doesn't appear over the whole printed page – some parts get a "shadow". Haven't found anything corresponding to the fault in the service manual, and after the above mentioned cleanup of the PC drum a test pattern prints fine at the moment. (But as I wrote this is intermittent)
Logga_shadow.jpg
Any suggestions greatly appreciated.
Cheers
Mateusz
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