Yeah I just read a tip. There seems to be a problem with the wave amp board, I will send you the engineering note. Sometimes though that encoder needs replaced and cleaning is not the total fix. The encoder may need replaced, but I found this also.
I just received this, this morning.
Failed Wave Amp
Did not fix.
Historically blurry print was caused by oil on the drum encoder wheel. This can be caused by the wave amp board. A cracked capacitor on the board causes the wave amp to produce a malformed amplified wave signal to the printhead. This in turn causes the printhead to eject ink at the wrong times, so the prints look blurry.
You can generally distinguish a wave amp problem from an oily drum encoder. The wave amp problem will usually be an infant failure. The printer will start producing blurry prints soon after it is installed and running. With a failed wave amp all prints will be blurry with no improvement. The drum encoder, on the other hand, may produce good prints and then bad prints and then good prints. Blurriness changes depending on how the oil is interfering with the encoder.