For those who have the bad type of red tint or have already reset the pulse counter, the service manual states that various adjustments are made according to the pulse meter. The pulse meter is used to determine accumulated usage time of the plasma display panel.
After digging through the patent database I found a patent filed by Pioneer in 2006 (attached) which deals with this concept. It was also the only source I could find that makes reference to “adjustments for accumulated time usage” and it is feasible that the Kuro range would have used these concepts.
Abstract: “Pulse voltage values and/or pulse widths of a variety of drive pulses that are applied to the plasma display panel are adjusted in accordance with the accumulated usage time of the plasma display panel.”
From reading the patent I have determined the following values to be adjusted automatically according to accumulated usage.
RGB Values (to maintain white balance)
The diagram below shows how the changes are applied over time. I noticed that the reset pulse curve increases quite steeply which may explain why I needed to adjust it upwards after reset. I still seem to be within tolerance values on scan pulse, sustain pulse and pulse width.
Pulse width appears to be adjusted at a set period in time (t1) rather than a gradual adjustment. No reference is made to the exact time that this would occur.
RGB values are interesting. Figure 14a shows that over time red remains constant, green falls slightly and blue deteriorates the most. Figure 14b shows how the levels are shifted to compensate. Blue remains constant, green is reduced slightly and red is reduced the most.
I think that although these adjustments happen automatically, scope for adjustment has been provided through the panel adjustment nodes in the service menu. My intention is to figure out what these adjustments do so that I can adjust my PDP should any side effects occur in the future.
US20060066519_split_1.pdf 314.2216796875k . file
US20060066519_split_2.pdf 294.2412109375k . file
US20060066519_split_3.pdf 138.6123046875k . file