Hot to clean dirty print Job (HP Laserjet P1102)

The Story:

Our QS Vincent complaint print out dirty with patches and vertical lines. This is not an old printer, maybe 1 year old. I doubt it's the printing mechanism problem.

Specification:
HP Laserjet P1102


How I check :

1. Take out toner and check for leaks inside toner compartment
2. Clean printer interior (toner slot) with brush
3. Check & clean toner OPC drum (the green drum) with tissue
4. Put toner back in & test print

What I found :
Found a piece of paper stuck on the toner OPC drum

How I fixed it :

1. Remove the paper (clot), clean the OPC drum with tissue.
2. Clean any spill in the printer with small brush.
3. Print a few pages to clean out the existing spills on the roller.

Additional notes:

• always turn off the power when cleaning
• most of the time, it is the toner problem rather then printer itself.
• if toner OPC drum keeps get clogged with toner, change new toner.
• sometime lines are due to damaged fusion heater film. You may see pieces of film inside the toner compartment. That, you need a pro to repair.