Service manual CD tray out of sync.

The problem is in the loading bay, sometimes 2 CD's will get jammed locking up the system, or the timing gear is out of sync, or possible broken gears.

Yes! it sounds very likely that a small loading belt has stretched, or the loading motor is not working, this is not an easy repair because the gears are timed and synced to work together, if the unit has a loading belt pull tray all the way out and look in the empty tray, may be visable! if you can remove it without taking it apart all the better, have a Tv repair shop size up the belt for replacement.

The tray may be jammed, or the timing gear is out of sync, or a broken loaing belt.

The gears have probably come out of sync, meaning the tray is riding on the limit switch. You need to remove the deck, dismantle and re-sync the drawer mech. Check the limit switch isnt bent, it's quite flimsy

Just a quick notion! Had you made sure the transit locking pieces were removed?

Have a Panasonic SA-PM53 pulled a CD trays out to get stuck CDs out. So how do I get the 5 CD trays back into the carriage and in sync?

Your goin to need to re align the tray , your gonna need the service manual for this purpose. Go to this link :
http://www.nodevice.in/manual/Sony/page15.html ,hope this helps you, AJ

if you open the cage on the unit, you can pop the tray back out of the mechanism by VERY GENTLY turning the load gear on the carriage, be sure to not slip any gears on the drive or the changer will be out of sync and will be garbage unless you have it serviced by an Alpine service center. you are best to turn the 1st. gear beyond the carriage motor, or you can apply power to the motor (which I don't advise) to let the motor eject the tray. if you do choose the power method, be 100% sure of the polarity first otherwise you will damage the carriage and drive gears. the motor has a brass gear and the rest are nylon gears, the brass gear will very easily shred a nylon gear. want to be extra careful? manually turn the load motor gear itself, it will take alot longer to do, but will be the safest. I've been inside these machines quite a bit, hope I was able to help.