Laserjet 3600 not printing black properly

I have an old laserjet 3600 that I use for printing magazine pdfs, but it has developed a bit of a problem recently.
It prints text fine, but when printing images the areas which would be solid black appear to be missing. Dark gray areas are fine though. Its very hard to explain, but if I were to print a photo with dark shadows, then the lighter area of the shadow would be fine, but the really pitch black part of the shadow would come out white.
I've mainly printing from OSX, but have tried under Windows also.
Does anyone have any ideas ?
Are there any test pages I can print and scan to post here ?
Many thanks in advance
James

I've had the same fault, formatter board temporarily fixes it for a week and then it comes back. Have also replaced power supply and formatter at the same time with only temporary joy. Time for a new printer i'd say. Gnu

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Good day,
To get your issue more exposure, I would suggest posting it in the commercial forums since your product is a commercial product. You can do this at Commercial Forums.
Enjoy your day!
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