PS2 Fat problem

I'd like to say Hi to the community!

I got a fat PS2, and I'd like to repair it. The modell is a fat SCPH 500004, and the condition are the following. The conole boots up, and it shows the welcome animation and after it the browser screen. If I put an original PS2 dvd (for example Tekken 5) into it, nothing happens.
I opened up the console, and blow the dust from it (just for a cleaner look, I didn't think it will resolve the problem ). After it I opened the DVD drive's top cover to see what the actual movement under it. The carrige with the laser assembly is moving freely, if i move it "up", the carrige goes "down" after it turned on. After it goes to the center, the laser flash for a very short time, and after it nothing happens (the dvd not spins). I read that (and saw it on an another working machine) a laser lens has to go up-down after the laser flashing for focus check. Mine is not doing that . I opened the laser assembly after that, because I read that there are coils which moves the lens up-down for focus and left-right for tracking. The article what I read said that you can measure the coil with an ohm meter for testing. I measure both the focus and tracking points and it showed 1 and with the continuity test mode it beeps for both. I assume that means they are good.

Can anyone has a suggestion what i have to check next? Fuses?

Thanks,
Zoltán

 

You measure the CD and DVD pots. A reading of 1 means you are touching other points than the individual pots themselves. First determine the version of laser you have then follow this guide. nuangel.net/pcdownloads/PlayStation2_Laser_Repair.pdf

My 400R laser wasn't reading discs and the DVD pot read 1040 when tested. It's supposed to be around 1400. Be sure to measure and log the original values in case you need to reset. Barely turning goes a long way.

If you need to adjust the angle of the laser that's a whole other story.

 

The laser type is KHS-400C. I try to measure it right today. I found 4 solder points on it after i removed the dust cover. I found on some article, that these 2 pair of points are the coil connections. I measured the pairs above each other.

 

Hi everyone!

I measured it again, and this time I can a reading on them.
If i look at the laser assembly and the worm tracking thingy is pointing to me, the left pair measures about 2 or 2.1 ohm and the right pair measures about 1.6 or 1.7 ohm.

Does it mean they are fired?
Can I diagnose that the control IC is is damaged or i can only hope that a new laser solves my problem?

Greeting,
Zoltán

 

Set your meter to 2000 ohm if it has one. That should give a non decimal reading

 

I read about the potmeters. They are at the bottom of the laser assembly.

The points where I measure the ohm values are these:

 

Do you get a red light don't look into the red light to see if the laser powers up if not dead lens they cheap enough now to replace.
may just want a clean.

 

There is no generic value for the pots.

 

As I wrote in the first post

. So yes, the red laser is on a very short time.

 

I don't think the points are connected to the pots.
I updated the pictures, I don't why the disappeared.

 

The pots have two extremely tiny connectors you need to be touching or you are reading the wrong area.

 

As a generic rule, you don't have to bother measuring the pot resistance. Each single manufactored laser has a different setting right out of the factory.
When adjusting a worn out / misbehaving laser without any proper tools, you should start by resetting the laser pots to the middle position. Statistically, this is where most of them should be.
If you ever have to turn the pots to 75% and it starts to work, then the laser won't last another 20 hours anymore. So don't bother even trying more than that.

@sp193 recently released the proper adjustment tools for this job. They'd be able to give you a proper diagnosis but they're pretty hard to set up.
http://assemblergames.com/l/threads/playstation-2-mechacon-adjustment-program-pmap.61003/

 

I ordered a new KHS-400C unit from ebay, and swaped the old one with the newly ordered one. Sadly the problem is still exists. The laser unit flashes ones and nothing happens. The focus movements are not shown after the laser unit change. So the ribbon cable or the controller IC can be bad . Is there any chance that some of the fuses are go bad, and it can resolve my problem? Or the easiest way is the HDD and freemcboot way?

 

EEPROM.

Try overwriting it with lenschanger. (load it up with Free MC Boot)

The pots under the laser are not that important, because they're not directly connected to the laser diodes. The drive read the voltage on the pots using ADCs and take them in consideration as a offset of whatever value is stored in the EEPROM. The pots are there to allow for a fine tune of laser diodes current on top of the EEPROM adjustments which are trickier to adjust (you need specialized equipment and dedicated SCEI service software running on a Windows PC).