I have pioneer PD-M501 cd player, Cartridge won't eject

The issue you're experiencing with your Pioneer PD-M40 suggests a potential problem with the disc loading mechanism or the sensor that detects the presence of the disc cartridge. Here are some troubleshooting steps you can try:
1. **Clean the Disc Cartridge and Player:**
Dust or debris on the disc cartridge or inside the player may affect proper disc loading. Remove the disc cartridge and clean both the cartridge and the player carefully with a soft, lint-free cloth.
2. **Inspect for Obstructions:**
Check for any visible obstructions inside the disc loading mechanism or around the edges of the disc cartridge slot. Ensure that there is nothing blocking the path of the cartridge as it is inserted.
3. **Check for Proper Alignment:**
Ensure that the disc cartridge is properly aligned when inserting it into the player. Misalignment may prevent the player from recognizing the presence of the cartridge.
4. **Try a Different Disc Cartridge:**
If you have access to another disc cartridge, try inserting a different one to see if the issue persists. This can help determine whether the problem is specific to the cartridge or the player itself.
5. **Power Cycling:**
Turn off the player, unplug it from the power source, and wait for a minute or two. Plug it back in, power it on, and then attempt to insert the disc cartridge to see if the issue is resolved.
6. **Test with the Lid Open:**
Power on the player with the lid open and observe the disc loading mechanism as you insert the disc cartridge. Check for any unusual movements, sounds, or signs of misalignment.
7. **Lubrication:**
If the player has not been used for an extended period, lubrication on moving parts may have dried out. Consult the user manual for recommendations on proper lubrication or contact Pioneer customer support.
8. **Contact Pioneer Support:**
If the issue persists and you've exhausted the troubleshooting steps, it may be advisable to contact Pioneer customer support or seek assistance from a qualified technician. There could be an internal issue that requires professional attention.
Always refer to the user manual for your Pioneer PD-M40 for model-specific instructions and recommendations. If you don't have the manual, you may be able to find it on the Pioneer website or by contacting their customer support.

Any way you can.

That is why they don,t manufactur them any more, There has been nothing but (Problems) With them doing that. It is out of (Alighnment) Just look for a good used one, You can buy a used one for $10to $ 50, To get it (Repaired) Your looking at $50 to $120,

this Pioneer PD-M502 have no remote sensor.mean this model was not designed to work by remote control.

it could be lots of things, how many hours of use your player has? (laser opticals have a life time) are you using cheap recorded CD's? ar the speakers too close to the player (loud base could make it skip) the laser optical could be dirty try a cleaning disk.

Good luck!

CDs go in the Upside Down position. Your PD M501 will accept PRW 1139, PRW 1141 and 163.
Lexus Models: CDX-M9071zt CDX-M8036, CDX-M9071, CDX-M9741, CDX-M9751
also:
Philips CDC-875 Pioneer CDX-FM35 Pioneer CDX-FM45 Pioneer CDX-M30 Pioneer CDX-M40 Pioneer PD-DM802

* Pioneer PD-DM902 Pioneer PD-M403 Pioneer PD-M423 Pioneer PD-M426 Pioneer PD-M450 PD-M453 PD-M455
* Pioneer PD-M501 Pioneer PD-M502 PD-M503 Pioneer PD-M510 Pioneer PD-M530 Pioneer PD-M550 Pioneer PD-M552 Pioneer
* PD-M600 PD-M601 PD-M603 Pioneer PD-M610 Pioneer PD-M630 Pioneer PD-M650
* Pioneer PD-M701 Pioneer PD-M702 Pioneer PD-M703 Pioneer PD-M710 Pioneer PD-M730
* Pioneer PD-M801 Pioneer PD-TM1 Pioneer PD-TM2 Pioneer PD-TM3 Pioneer CCS-430
* DCM-444 and DCM 777

BMW 740 OEM

The standard cartridge for the Pioneer PD-M501 is the Pioneer JD-M300 6-disc magazine, and you can find them at Amazon.com for $25 new. The JD-M300 fits a lot of different brands of CD players, not just this particular brand and model. And here's a link to a copy of the owner's manual: http://www.scribd.com/doc/22613342/Pioneer-PD-M601-M551-M501

Sometimes the little ball bearings that keep the cart trays separated come out causing tray jams.
Make sure your tray retracts all the way into the player flush with the face plate, gently push it in while retracting for those occasional no-read situations. (Also for Denon that takes these same carts). Also note that the CDs go in the Upside Down position.
Applicable to:
Lexus Models: CDX-M9071zt CDX-M8036, CDX-M9071, CDX-M9741, CDX-M9751
also:
Philips CDC-875 Pioneer CDX-FM35 Pioneer CDX-FM45 Pioneer CDX-M30 Pioneer CDX-M40 Pioneer PD-DM802

* Pioneer PD-DM902 Pioneer PD-M403 Pioneer PD-M423 Pioneer PD-M426 Pioneer PD-M450 PD-M453 PD-M455
* Pioneer PD-M501 Pioneer PD-M502 PD-M503 Pioneer PD-M510 Pioneer PD-M530 Pioneer PD-M550 Pioneer PD-M552 Pioneer
* PD-M600 PD-M601 PD-M603 Pioneer PD-M610 Pioneer PD-M630 Pioneer PD-M650
* Pioneer PD-M701 Pioneer PD-M702 Pioneer PD-M703 Pioneer PD-M710 Pioneer PD-M730
* Pioneer PD-M801 Pioneer PD-TM1 Pioneer PD-TM2 Pioneer PD-TM3 Pioneer CCS-430
* DCM-444 and DCM 777

BMW 740 OEM and others.

With the top off the unit, you can turn the tray gears manually for slow eject function. Unplug unit before touching anything inside, check internal fuses.
Sometimes the little ball bearings that keep the cart trays separated come out causing tray jams and shorts.
Make sure your tray retracts all the way into the player flush with the face plate when loading, gently push it in while retracting for those occasional no-read situations. (Also for Denon that takes these same carts). Also note that the CDs go in the Upside Down position.
Applicable to:
Lexus Models: CDX-M9071zt CDX-M8036, CDX-M9071, CDX-M9741, CDX-M9751
also:
Philips CDC-875 Pioneer CDX-FM35 Pioneer CDX-FM45 Pioneer CDX-M30 Pioneer CDX-M40 Pioneer PD-DM802

* Pioneer PD-DM902 Pioneer PD-M403 Pioneer PD-M423 Pioneer PD-M426 Pioneer PD-M450 PD-M453 PD-M455
* Pioneer PD-M501 Pioneer PD-M502 PD-M503 Pioneer PD-M510 Pioneer PD-M530 Pioneer PD-M550 Pioneer PD-M552 Pioneer
* PD-M600 PD-M601 PD-M603 Pioneer PD-M610 Pioneer PD-M630 Pioneer PD-M650
* Pioneer PD-M701 Pioneer PD-M702 Pioneer PD-M703 Pioneer PD-M710 Pioneer PD-M730
* Pioneer PD-M801 Pioneer PD-TM1 Pioneer PD-TM2 Pioneer PD-TM3 Pioneer CCS-430
* DCM-444 and DCM 777
Many Magnavox, Denon, JVC,
BMW 740 OEM and others.