How can I replace T401 on CD unit PCB?

[dogos]

I have EXL-P604 and EXL-P605 unit.
EXL-P605 works fine but EXL-P604 won't recognize any cd, when I insert any saturn retail CD or burned CD-R.
I confirmed that Laser works very well in EXL-P605 unit. But this laser won't recognize any CD in EXL-P604 unit.
I tried to adjust IC which look like some kind of potentiometer and written in T401 in EXL-P604 unit's PCB.
When I tighten its potentiometer too hard with small screw driver and suddenly I heard some kind of snap or cracking sound from T401 IC and since then saturn won't spinup anymore..
I think I broke some internal part in IC of T401 and need to replace IC of T401 in  EXL-P604 PCB But I don't know what IC I have to purchase in order to replace  IC of T401.
Is there anyone who know what is IC of T401 and Where can I purchase this IC?
I'm sorry for my poor English and any reply would be appreciated.
 

[dogos]

I soldered solder pad of sensor which sense when Optical Laser Head located at the front and It seems that it does Spinning up again.
But saturn only recognized any retail CD or burn CD-R as audio CD.I fiddle with orange pot which is backside on Optical Laser Head,But It only recognize as audio CD..
And I noticed that spindle speed is somewhat slow comparing to EXL-P605 which works very well.
I tried to fiddle with VR401 of variable resistance.But there was no difference in spindle speed
Is there any way to speed up spindle speed?