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v9 with M2 & wappy laser
v9 with M2 & wappy laser –
I've just chipped a customers satin silver PS2 with a M2, the install works fine (boots everything). theres just 1 small problem, about 75% of the time when pressing eject or standby, with the console in any state the laser makes one horrible noise, (a very loud,deep tapping noise). i have had the top off the drive and it appears that the laser unit pushes up against the spindle and the lense moves up and down rapidly for about a second and then settles down. when it doesn't make the noise the laser unit has about 2mm clearence from the spindle.
I have yet to find a patten to this behavour and i can't give it back to the customer like this.
anybody have any ideas. its stumped me.
Note: I have a problem with another console (
see here ) both chips from saem batch, could it be chip related?
When we did our LA chip experiments, we observed the laser unit behaviour withot a disk in. That's described in a sticky thread above. The laser unit moves to the centre where the start of the disk is expected to be. It doesn't know at that point that there's no disk in there. So it tries to focus and because there's no disk in there, it goes all the way down and up - a full 4volts pressure.
There should be no horrible noise though - it should all be pretty silent.
If the laser unit actually hits the spindle, then the limit switch isn't working properly and isn't stopping the sled motor.
In my opinion it isn't chip related because you have described standard disk firmware behaviour barring the noise.
Hope that helps.
As you said
I appear to have a standard modded PS2 behaviour barring the noise, so what's causing the noise???
standard disk firmware behaviour barring the noise
would it help is i tried to get a video of the behavour with the top off the drive?
Sure - viewable evidence with sound will help enormously.
I had the same problem with some M1 on V4, but happens only if you hit reset with the tray open and the sled motor did not stop at limit... I solved this problem swaping the BA chip
right here we go then. I've got a vid of the problem hope it helps
be warned its 2 MB
It looks to mee that the limiter switch that prevents the sled from hitting the spindle isn't doing its job. The vibration would be the lens tracking coils with the lens banging against the spindle.
So it seems.
The limiter switch circuit is traceable so you might be able to find out what's going on or if you are not ecpert, an expert could.
Like my 'famous mate round the corner'.
ok right i dont an occilloscope, however i have test the resistance on the switch,
when the laser is makeing the noise the switch has a resistance of between 90 -110 ohms, when it settles down it is about 45 ohms. dose this help.
I have also noticed the lens is not going up and down rapidly it is going back and forth.
Any more bright ideas guys Or does the resistance above mean the switch is screwed
I dont fancy having to change it if not
Just as a matter of interest, which version of firmware is the M2.