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Why has my color laser printer started making a horizontal bars of heavier toner concentration across the page

It's a HP 1500L, and I've had it for years. Both the printer drum and toner cartridges were replaced a (low volume) month ago, and should not be even close to empty. I've taken out all he toner cartridges and shook them a bit, to redistribute the toner, but this didn't make any difference.

Public Comments

1. Power off Printer and remove toner, look inside for a Black/Grey spongy roller which the toner sat on clean this.
2. Cleaning sounds like the ticket. Use rubbing alcohol to do this on a q-tip. Clean the print heads too.
3. Shake it from side to side (NOT up and down -- you'll get toner all over your hands). This always worked for me when I used to own an HP Laserjet 1100A a few years back.