Troubleshooting CD Players
- Thread starter dr*audio
- Start date
dr*audio
Fish fingers and custard!
If they work they are probably ok.
Oggioffshore
Active Member
NAD 5000 CD player.
Was thinking change the original op amps NE5532 to some giving maybe warmer sound, more punch.
Was thinking change the original op amps NE5532 to some giving maybe warmer sound, more punch.
dr*audio
Fish fingers and custard!
LM4562 will sound wonderful.
dr*audio
Fish fingers and custard!
Unplug P103, insert a CD, and measure the voltage on P103 pin 1 and Pin2. Maybe the motor is bad.
Managed to fix it. Since i was not sure the laser was dead and didnt want to spend money on a manual from ebay, marked all the pots positions and tried adjusting them
Adjusting R104 slightly made the disc spin. Reads and plays CDs now!! Thanks dr*audio
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dr*audio
Fish fingers and custard!
Focus Bias. You should really do that with a scope for the best eye pattern.
Where do we probe the eye pattern. Not getting anything in my oscilloscope when i tried the 3 TPs in the picture...
dr*audio
Fish fingers and custard!
There should be a test point labelled "RF" or "HF". I can't find a service manual for that model for free. You are going to have to buy one and look at the adjustment procedure for Focus Bias.
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yep, it sounds good as of now.. there are some sellers in eBay, will update if I buy one and check it out..
I cant find a test point for RF anywhere..
urbom
Member
5.2v. I have the motor from a KSS-210A, can use that?
dr*audio
Fish fingers and custard!
What does each pin measure? Both 5.2V? One is 0V and the other is 5.2V?
dr*audio
Fish fingers and custard!
Ok, I call measurement error! How can you measure 5.2V across the 2 pins but 0V from either to ground?
Make sure you have a good ground.
urbom
Member
Remeasured.
With cd in very soon after it closes.
Pin 1 to ground, .002v
Pin 2 to ground, .001v
Pin 1 to Pin 2, -5.2v unless I flip leads, then it is +5.2v
I was really careful
Hi,
Thanks to Dr*Audio and other contributors for this excellent information repository!
I'm working on my Sony CDP-C89ES. This unit uses the KSS-240A pickup.
It was skipping occasionally, though much worse towards the later tracks of the CD.
I removed the laser platform, cleaned the slide, oiled the spindle motor, and oiled the laser motor.
Problem 1 (spindle motor and laser behavior)
---------
After reinstalling the laser platform, the player is now behaving oddly.
When I power on, the laser always moves to the far outside position, clamps, lens bobs up (sometimes), then ...nothing. Spindle motor never moves. After a few seconds, the carousel moves to the next position and repeats the prior steps.
I applied 6V to both the laser and spindle motors (in circuit) and both motors spin freely and quietly in both directions (with reverse voltage).
I have checked both ribbon cables multiple times.
Problem 2 (intermittent power up):
---------
This one is strange and intermittent: Sometimes the player is unresponsive to Power On. If I simply flip the whole chassis upside down, and then invert it back to normal position, the player will power up.
I searched and searched the circuit board and connections on the underside of the unit to ensure nothing is shorting on the copper bottom plate. Everything looks normal.
Thanks to Dr*Audio and other contributors for this excellent information repository!
I'm working on my Sony CDP-C89ES. This unit uses the KSS-240A pickup.
It was skipping occasionally, though much worse towards the later tracks of the CD.
I removed the laser platform, cleaned the slide, oiled the spindle motor, and oiled the laser motor.
Problem 1 (spindle motor and laser behavior)
---------
After reinstalling the laser platform, the player is now behaving oddly.
When I power on, the laser always moves to the far outside position, clamps, lens bobs up (sometimes), then ...nothing. Spindle motor never moves. After a few seconds, the carousel moves to the next position and repeats the prior steps.
I applied 6V to both the laser and spindle motors (in circuit) and both motors spin freely and quietly in both directions (with reverse voltage).
I have checked both ribbon cables multiple times.
Problem 2 (intermittent power up):
---------
This one is strange and intermittent: Sometimes the player is unresponsive to Power On. If I simply flip the whole chassis upside down, and then invert it back to normal position, the player will power up.
I searched and searched the circuit board and connections on the underside of the unit to ensure nothing is shorting on the copper bottom plate. Everything looks normal.
dr*audio
Fish fingers and custard!
The place where you are connecting your black meter probe is not ground. If you are using the chassis, it may not be connected to power supply ground. Use P106 Pin 2 for ground. Please re-measure.