PS2 PS2 Slim 70000 - DVD/CD won't spin

R

RolePSGuy

Member
Hello guys,
I need help to fix my PS2 slim model 70000. After many years of not usage "I took it for a ride". Unfortunately the dvd motor doesn't spin anymore. I see the lens going up down (to focus?) and I spot the laser through the disk surface attempting to read the data. I made an eye check to the motherboard searching for defective components but I have not found anything. Cleaned it with Isopropyl Alcohol
Then I bought the repair parts, a lens and a motor. Unfortunately the issue is still there.
What do you think? Do you have suggestions on which components to check?

EDIT:
Hello again, my quest to (try) repair my PS2 continues.
here more details:
the motor rotates partially if I spin the disc while the lens starts moving. Unfortunately, the disc does 1/8th of a rotation then back, then spins again then back in a loop as the lens tries to focus the disc.
I decided to check the continuity (ohm resistance) across the traces from the motherboard connector (flat white cable) to the small board under the motor itself where the white cable is soldered.
I don't know if the readings are correct, but I suppose I should have a single value for each trace. This is not my case; I have readings even between mismatched pins and connectors;
For example:
from pin 1 to connector 1 I have 0.8 ohms; but I also have 3.8 ohms from pin 1 to connector 2.
The readings are:

Flat connector-board wire = value
1-1 = 0.8 ohm
1-2 = 3.8 ohms
1-3 = 3.8 ohms

2-1 = 3.8 ohm
2-2 = 0.8 ohm

3-1 = 3.6 ohm
3-2 = 3.8 ohm
3-3 = 0.8 ohm

4-4 = 0.8 ohm

5-5 = 0.7 ohm

6-6 = 0.7 ohm

7-7 = 0.7 ohm

8-8 = 0.7 ohm

9-9 = 0.7 ohm

10-10 = 0.6 ohm
10-11 = 112.1 ohm

11-10 = 111.8 ohm
11-11 = 0.8 ohm

12-12 = 0.8 ohms

Are these readings correct?
 
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I have tested CD and DVD and also tried to adjust both potentiometers.
My laser (the old and the new one) are sligtly different from the image; They don't have that antistatic jumper (also the orange wire is not here)
 
The lens moving up/down means the coils are fine and the visible laser beam means the diode is fine... im telling this in general, we dont know if are working 100% fine but we are sure are "alive", at least are working partially
The fact that the discs spins a bit also means that motor is fine too
You could do another test to check the other motor, with the PS2 powered off... move the laser pickup to a different position (random at the middle of the rail), then power on the PS2 and the laser pickup should "return" to the most inner position

IMO you made a mistake when you adjusted the potentiometer/s... let me explain it in short...
That potentiometer is calibrated with some equipment most of us doesnt have at home (an oscilospcope, etc...) so when we adjust the potentiometer for the first time we are losing the "factory value"
The only way to prevent that is to meassure the resistance in the potentiometer itself... take note about that value, and be sure to save it at some safe place
What i use to do is to draw it on the laser pickup with either a permanent marker or by scratching the metal with scissors, this way im 100% sure im not going to lose it, lol
The reason is because later... if at some point you need to make some test adjusting the potentiometer (but the results of that tests doesnt gives any improvement) you can adjust the potentiometer again to return to the exact value "from factory"
If you already adjusted the potentiometer but you dont have that value... well... you are not completly sure if is right or wrong

Another thing i suggest you to do now that you are talking about the "cables" and "connectors"... is to take the ribbon cables out of the PS2, place them on top of a flat surface (a table) and use some weight to keep them plane with the copper contants aiming to top (i use a book or whatever i have at hand)
In that position, use a multimeter and meassure resistance along all the copper traces of the ribbon cable (by touching in the extremes of all them)
The multimeter should report resistance = 0... this means the copper trace is fine
If you see something different than 0 it means the ribbon cable have some copper trace broken internally (at some intermediate point hidden by the plastic layers)
 
I'm almost sure that the values on the stock laser are the default. Not sure about the new laser. I marked the stock values with a marker but I lost the mark so after a year I do not remember.
One of my ex collegues has an oscilloscope; what should we do to calibrate the laser potentiometers? I'm immagine that a special cd should be used as a reference, right? But this means that I need a spinning motor...

Anyway, I reassembled my PS2 with the new laser and the old motor just to not have sparse parts in a random box. I checked the system and I noticed that the behavior is now different:
with a cd, the motor is not spinning. I have to move it with my finger then the motor starts to spin with a low speed while the laser is trying to read the disk. Then after some attemps. it stop.

with a dvd the disk is spinning with a higher speed (compared to the cd) and the laser is constantly trying to read the data but it can't. The process restarts continuosly.
I tried different games on dvd but the behavior is the same.

I have also noticed that sometimes the pad on the port one doesn't work; after a disconnection and a reconnection it works.
Pretty strange. Are pad ports and the motor connected and are sharing some components? Maybe the issue is on the pad ports and is causing the motor to malfunction.

I have found the eletrical scheme for the PS2 with all the components listed (I'm sure you already have it).
Are there components to be checked? I checked fusibles: The multimeter is reading the same value on each one. I think they are ok.

thoughts?
 
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