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VeGeTa escribió:SEYMURX creo que no tienes razon ¿porque? porque ya he echo una consola con FIX TEOBSERVO y despues instale el chip y todo perfecto.
Quo vadis escribió:Por lo que veo estais mal informados ya que el único FIX presentado por Romeo para las v12 consta sólamente de 4 diodos zener y es eficaz por cierto, pero yo llevo hechas 35 TWO con el FIX TE OBSERVO (que para mi y no me cabe la menor duda que es de él el fix) ya que el lo habrá tomado corregido o lo que sea pero a ése FIX se lo he visto solamente a él y funciona perfectamente, he probado con el FIX de Romeo repito es el único presentado por él para las v12 (estoy registrado en un foro italiano) y hablo con fundamento y no me ha fallado tampoco, pero yo al FIX TE OBSERVO lo veo mas completo y funciona a la perfección y con todos los tipos de placas existentes.
Vandrunen escribió:yes that last link was in italian and they were describing a "romeo2 mod":
http://www.hardstore.com/default.asp?cmd=getNews&cmdID=2225
Hooking up the "silent PWMx2 5-channel motor and tilt driver" to a 5 volt power supply from the PSTwo didn't work, the driver IC would just not function at all (I tried that too).
But in this site they describe using a 7805 voltage regulator that uses the ground plain of the PSTwo as a cooling ribbon. And placing two diodes in series in between the ground input of the 7805 and the ground of the PSTwo. This way they would elevate the 7805's output voltage with 1.2 volts above ground. The 7805's input is soldered to the same powersuplpy point as the tilt-driver IC, but then on the "other side" of fuse PS11 (on the bottom). Then the output of the 7805, which will be at 5 + 2*0.60 = 6.2 volts is soldered to the VCC2 of the tilt-driver.
So what they did is hooking the tracking/focussing power supply of the driver IC to 6.2 volts... one VERY BAD thing about this fix is that they soldered the input and the output to the same voltage node with fuse PS11 in between.
The driver IC is connected to both 8.5 volts via fuse PS11 and 6.2 volts via the 7805. In result fuse PS11 would burn out to seperate the two circuits and all is fine.... but what if you want to restore the PSTwo to default??? then you would have to replace the fuse.
I would say... nice fix to get the maximum current down with just a few parts. And a much more elegant solution than clipping the driver IC's input voltages to +/- 1.2 volts... that would seriously degenerate the PSTwo's speed and capability to re-focus and re-track it's discs.
Unsolder fuse PS11 when you do this (dangerous too btw)... or even better... solder the 7805's input pin to the bottom of the PSTwo on the right (protected) side of fuse PS11 and lift the pin of the driver IC off the motherboard and solder the output of the 7805 to this pin.
Here's a link to the 7805 datasheet just for reference:
http://www.national.com/ds/LM/LM7512C.pdf
ok... so this was another one of my semi-scientific analysis.. hehe... I hope it's of any use. If I wouldn't have any better ideas to fix the "PSTwo Syndrome" I would take out my camera, do this fix, make some better tutorials of this and post it on this forum. But no, you can try this if you like and in a week or two I'll introduce my own fix when it's tested and proven ... ow.. it won't be a "quick and easy" fix... but it will be a very good one. There are some serious design flaws in the PSTwo... and the only way to fix it... is to fix all flaws sufficiently.