Use a commercially recorded CD, preferably an older issue, because newer issues can have lower reflectivity. If you have a scope and can see the RF waveform, it should be 1.2V - 1.5V peak to peak, on a player with a Sony chipset and many others as well. If the table of contents is displayed but the player doesn't play, the pickup is either bad or the internal adjustments must be performed. If the disc spins, focus search was successful and the player achieved focus lock. Some players have IC protectors that look like transistors with only 2 leads. If the lens doesn't move after the pickup finds home, either the pickup is bad or the cable for the pickup is broken, or the drive IC is bad, or there is a power supply problem. Depending on the construction of the mechanism, you may have to remove the disc motor board in order to get to the switch.Īfter the player correctly senses the home postion, the focus search starts and the laser pickup lens moves up and down. Then flush the debris out with contact cleaner or alcohol and gently replace the plastic cover. Then clean the contacts by drawing 600 grit sandpaper through them just a couple of times. Note what position it is installed in, and gently pull the cover off. There is a plastic cover on the end of the leaf switch. On Sony based players, the home switch is a leaf switch located on the board that the disc motor is on. If the pickup moves toward the disc motor and doesn't move back, the switch is dirty and doesn't close.
#Onkyo cd player motor no cd
With no CD in the player, turn the player on and watch the laser pickup (don't look directly at the lens!) If the pickup moves toward the disc motor then moves back, the switch is ok. If the switch gets dirty the micro keeps the motor on in reverse and the pickup won't move. Check the loading belts.) There is a switch that tells the micro that the pickup is in the home position so it can stop the motor and keep the pickup from jamming. (If the pickup doesn't move at all, the CD mechanism may not be in the fully loaded position, or there may be a problem with the sled drive or motor.
Then it will reverse the sled motor until the home position switch closes, then it moves the pickup forward a bit until the switch opens.
Observe the mechanism with no disc loaded and the cover off (don't look directly at the lens!) When the player starts, the first thing the micro does is make sure the drawer is loaded and the mechanism has risen up to the play position. I am tired of repeating this info in multiple posts so I want to make a memory dump in one place.
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