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Nad 502 doesn't spin the cd, ejects ok. I have replaced the cd mechanism so suspect main pcb error - any thoughts?

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  • tatstats Apr 26, 2008

    yep - laser pickup included

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2 Answers

Could be the main board, but check on your power supply for the board as well.

Posted on Apr 26, 2008

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  • 236 Answers

When you replaced the CD mech... does that include the laser pick-up?

Posted on Apr 25, 2008

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1 Answer

NAD T515 connected only to a Harman Kardon amp, and also skips for a second. Listen only to the cd spinning: a fault exists with the mechanism.


Greetings
Replace the Laser head.
this Error is from reading the Disk. as long as the reader doesn't get enough Data from the disk it will continue spinning.

Good luck
Regards

May 09, 2015 | Harman Kardon Audio Players & Recorders

1 Answer

BOSE 3 CD PLAYER DISC 3 SHOWS DISC ERROR AND WILL NOT EJECT. TRIED SLIDING OLD DISC UNDER STUCK DISC AS RECOMMENDED WITH NO SUCCESS


hi,
Its because of the disc three is out of its potion in the tray. You have to remove the mechanism to remove the disc from the tray. You have to be very carefull while removing the mechanism because the cd loading mechanism is a very complicated part of cd players . Because when you remove the mechanism to eject the disc, the timing of of the the machanisum can be changed this will lead to malfunction of the loading arms and wheels and will cause serious damages to the mechanism. If you are not aware of how to remove the the try to contact the bose servicing centre.
If you are confident the try to remove the cd manually.
OK

Nov 25, 2011 | Audio Players & Recorders

1 Answer

Philips mcm9 system won't read any cds. It says "reading" but nothing else happens and even says that when there is no cd in slot, radio & tape are both working and cd player was working...


In most cases when the CD does not play it is possible that the optical head is a suspect. Sometimes it might pick up ordinary audio CD but will not play other formats. This indicates that the optical head is weak and so there is no detection or scanning of the CD . If the optical is working the tracks will be read immediately but with no scanning the laser head can be defective.

If the no disc comes even without a disc in the player you must check and see if there is a mechanical fault specially in the loading section that seems to trigger the CD mode to work.

Also check to see the main motor as it will not work in some cases as unless the tracks are read the drive motor will not work with signal from the processor. Also in some cases the central motor base can shift and so the distance to the disc can be more resulting in low detection. You can pull up the spindle to come closer.
Sometimes certain cleaner disks will not be tracked to run for cleaning as it will not be read and so will reject. Hence it is ideal to manually clean the laser head eye using a cleaning swap /cotton bud with gentle pressure on the lens eye.
If there is no result then watch if the CD spins or tries to spin. If so the board seems to work unless a test is taken on the main board but the possibility of a defective optical head can be the suspected fault.
If any of the above seems otherwise we must recheck with possibilities of a malfunction of the main processor board

Jul 29, 2011 | Audio Players & Recorders

1 Answer

Sometimes I get no disc error when insert a cd in my sony cdp-ex100 cd player


Put in an ordinary audio CD and play to notice if the CD is detected. If yes the optical is working, if not there is no laser scanning and the possibility that the laser head can be defective.
Now certain cleaner disks will not be tracked to run for cleaning as it is not read. Hence it will reject. So it is ideal to clean manually the laser head eye using a cotton bud with gentle pressure on the lens eye.
If there is no result then watch if the CD spins or tries to spin. If so the board seems to work unless a test is taken on the main board but the possibility of a defective optical head can be the suspected fault.
If any of the above seems otherwise we must recheck with possibilities of a malfunction of the main processor board

Mar 03, 2011 | Audio Players & Recorders

1 Answer

I added a turntable to my system NAD 72296 receiver and the record played for two minutes before the receiver quit. Now I cannot even get the cd player (which worked yesterday) or radio to work . . .but...


hi,
check ur speakers first is it working or not. u said above that the sound is getting through the head phone. the headphone out is also coming from the main amplifier by reducing power using resistors. so amplifiers have no problem. also check is there is any switch for speaker A and B and is it OFF or ON.
ok

Dec 27, 2010 | NAD Audio Players & Recorders

1 Answer

Unit not powering up


Probably Laza got into the system . Try luring him out with some small children ?

Dec 21, 2009 | Pioneer VSXD814 Receiver

1 Answer

Nad 743 shuts off at -14db vol. Why?


mine got fixed by replacing the front panel PCB with control processor. Only 350€...

Feb 28, 2009 | NAD T743 Receiver

2 Answers

The six disc changer on my Jaguar XK8 won't eject the disc cassette and the head read E01...any thoughts? Regards David


The slider mechanism, depending on the age of the unit and the manufacturer, consists of the small chrome rail, a drive motor, a small gear assembly, and (in some units) a small belt that drives the slider unit via the motor. This small belt causes all sorts of problems. If the belt is broken or slipping, it can cause skipping, dropouts, or simply no start up at all. Also, if the belt breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped up into the gears, or the pick-up assembly doesn’t return to the start position (called home), the unit will (99% of the time) refuse to release the disc, causing it to become stuck inside the unit. There’s a little micro or leaf type switch located at home position that sometimes gets dirty or breaks and, causing this problem also.
If the disc starts to spin slowly and doesn’t come up to speed, the spindle motor that’s attached to the turntable platter is a common problem. There could also be a problem with the spindle motor driver controller IC or the power supply regulator that supplies voltage to the driver IC. If the disc starts to spin and then spins really fast, or stops and starts to spin backwards, your problem is the laser pick-up assembly or the servo control circuit. If you continue to have problems after cleaning and checking the other things listed above, you may have a problem with the player's alignment. Of course, one of the problems you'll face checking alignments on a DVD/CD player is that you’re going to need to use an oscilloscope on most of them. If you have the proper tools and equipment, the first thing to look at is the RF pattern of the unit while its playing. It should be a sharp and clear pattern. If it's dull and smeared, then the laser could be weak.
Also, in these units are very critical alignments called the focus/tracking gains and offsets. When these alignments are off, it can often cause intermittent troubles. As the unit ages and parts change value, so do these alignments, and will need to be checked. In my time as service technician repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were good and only needed a small adjustment. Today's technology makes it unfeasible for a shop to hook up a DVD/CD player, and even some recorders, to their equipment and make these adjustments because of the cost involved.


To clean the lens you must use very little pressure. Take a cotton swab and barely moisten it with plain, non-scented, or oily type alcohol. In a swirling motion, very gently rub the lens until you’ve covered it entirely. Then repeat using the dry end.
If the cleaning didn’t help, don’t despair just yet. You can see if there’s a problem elsewhere in the unit by using a few simple tricks and tips.
First thing you want to see if the unit’s laser is in good working order. This method isn’t foolproof, but most of the time works admirably. When you insert a disc, see if you can look up underneath where the disc sits on the turntable. Observe the laser lens going up and down. If the lens is trying to focus, that’s good! After a few seconds of the lens trying to focus, the platter should start to spin. On almost every CD/DVD unit I've encountered, the unit won't spin unless the laser has properly focused on the surface of the disc. If the unit spins up and and then shuts down, you should check and make sure the laser pick-up assembly slider mechanism is working without any obstructions and that the small chrome rail that it slides on is slightly greased. Don’t go overboard with the grease though, as too much can cause all sorts of problems

Hope it may help you;

Regards,
VOTIT

Sep 30, 2008 | Audio Players & Recorders

1 Answer

I have a Becker Silverstone 2662 6 disc changer for a Mercedes C Class. The cartridege would not eject. I have managed to take unit apart and free the cartridge but It wont stay in when I push it back in....


You must clean the lens you must use very little pressure. Take a cotton swab and barely moisten it with plain, non-scented, or oily type alcohol. In a swirling motion, very gently rub the lens until you’ve covered it entirely. DVD chassis, you can plug in the unit and check if this helped the player to "see" again. Most of the time you can check as is, though on the combo units you're going to have to slide the chassis assembly all the way back into the cabinet to get it to work because the cables are often too short. If this didn’t fix the problem, please read on.
Other things to check
If the cleaning didn’t help, don’t despair just yet. You can see if there’s a problem elsewhere in the unit by using a few simple tricks and tips.
First thing you want to see if the unit’s laser is in good working order. This method isn’t foolproof, but most of the time works admirably. When you insert a disc, see if you can look up underneath where the disc sits on the turntable. Observe the laser lens going up and down. If the lens is trying to focus, that’s good! After a few seconds of the lens trying to focus, the platter should start to spin. On almost every CD/DVD unit I've encountered, the unit won't spin unless the laser has properly focused on the surface of the disc.
f the unit spins up and and then shuts down, you should check and make sure the laser pick-up assembly slider mechanism is working without any obstructions and that the small chrome rail that it slides on is slightly greased. Don’t go overboard with the grease though, as too much can cause all sorts of problems.
The slider mechanism, depending on the age of the unit and the manufacturer, consists of the small chrome rail, a drive motor, a small gear assembly, and (in some units) a small belt that drives the slider unit via the motor. This small belt causes all sorts of problems. If the belt is broken or slipping, it can cause skipping, dropouts, or simply no start up at all. Also, if the belt breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped up into the gears, or the pick-up assembly doesn’t return to the start position (called home), the unit will (99% of the time) refuse to release the disc, causing it to become stuck inside the unit. There’s a little micro or leaf type switch located at home position that sometimes gets dirty or breaks and, causing this problem also.
If the disc starts to spin slowly and doesn’t come up to speed, the spindle motor that’s attached to the turntable platter is a common problem. There could also be a problem with the spindle motor driver controller IC or the power supply regulator that supplies voltage to the driver IC. If the disc starts to spin and then spins really fast, or stops and starts to spin backwards, your problem is the laser pick-up assembly or the servo control circuit.
Also, in a DVD/CD player there are many complaints where the disc gets stuck inside of the unit. This could be as described earlier, but there’s also what’s called a drawer/disc tray opener and closer mechanism to contend with. On many models, old and new alike, there’s a small belt that goes bad and wont let the tray open. You can usually put your ear very close to the front of the unit and, if this is happening, hear the motor spinning when you press the eject button. Another cause is the nylon gears, which can get jammed up with dirt and dust. Also, in other cases, you could have a motor problem, or the driver IC could be at fault. If you suspect that the motor is at fault, simply measure the voltage on the tray motor while pressing on the eject button. If the voltage comes up between 6 to 12 volts, depending on the manufacturer, then the motor needs to be replaced.
Alignments
If you continue to have problems after cleaning and checking the other things listed above, you may have a problem with the player's alignment. Of course, one of the problems you'll face checking alignments on a DVD/CD player is that you’re going to need to use an oscilloscope on most of them. If you have the proper tools and equipment, the first thing to look at is the RF pattern of the unit while its playing. It should be a sharp and clear pattern. If it's dull and smeared, then the laser could be weak.
Also, in these units are very critical alignments called the focus/tracking gains and offsets. When these alignments are off, it can often cause intermittent troubles. As the unit ages and parts change value, so do these alignments, and will need to be checked. In my time as service technician repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were good and only needed a small adjustment. Today's technology makes it unfeasible for a shop to hook up a DVD/CD player, and even some recorders, to their equipment and make these adjustments because of the cost involved.

Jul 16, 2008 | Audio Players & Recorders

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