I'm not following you 🙂
The test was to connect two wires to the sled motor so you can monitor the voltage while playing.
Where does the HC4049 come into it ?
The test was to connect two wires to the sled motor so you can monitor the voltage while playing.
Where does the HC4049 come into it ?
Mooly HC0409 isn't related nothing to sled motor, now I have music again (I suspected that when removing pots I burned the 0409).
Not really following you 🙂
The spindle motor (the platter) will only turn after the laser has found focus. In post #182 it was playing music so spindle motor must have been running. The sled motor drives the pickup assembly and should turn slowly when playing or rapidly when jumping tracks.
I'd have to re-read it all as its going back a couple of months and I'm short on time at the moment.
Is it not playing and not spinning the disc now ?
The spindle motor (the platter) will only turn after the laser has found focus. In post #182 it was playing music so spindle motor must have been running. The sled motor drives the pickup assembly and should turn slowly when playing or rapidly when jumping tracks.
I'd have to re-read it all as its going back a couple of months and I'm short on time at the moment.
Is it not playing and not spinning the disc now ?
It's a new problem (spindle motor not turn), until one or two hours the transport goes OK just not reading first track or final tracks. Yes don't do the TOC because the spindle don't turn, so not play & not sapinning the disc.
It sounds like something has happened to the player...
The sequence of events is,
1. Make sure the sled is in the rest position near the centre of the disc. If you move the sled manually away from the centre and open and close the tray or power off and on then the sled should always return to the rest position.
2. The lens should perform the focus search routine moving up and down 3 or 4 times.
The spindle motor nevers spins until focus is found on a disc. If there is no disc the motor doesn't spin. If the laser is faulty or it can not focus for whatever reason then again the motor does not spin.
When the motor does run the voltage will be DC (assuming a normal type motor and not a hall effect type) and the voltage probably only a few hundred millivolts.
The sequence of events is,
1. Make sure the sled is in the rest position near the centre of the disc. If you move the sled manually away from the centre and open and close the tray or power off and on then the sled should always return to the rest position.
2. The lens should perform the focus search routine moving up and down 3 or 4 times.
The spindle motor nevers spins until focus is found on a disc. If there is no disc the motor doesn't spin. If the laser is faulty or it can not focus for whatever reason then again the motor does not spin.
When the motor does run the voltage will be DC (assuming a normal type motor and not a hall effect type) and the voltage probably only a few hundred millivolts.
Thanks for support Mooly.
1. When I move the sled away from the center always the sled always return to the rest position.
2. The laser don't moves 3 or 4 times & I don't see the red light reflected in my hand.
As per your advice I have to look for in the chip that makes the focus?
1. When I move the sled away from the center always the sled always return to the rest position.
2. The laser don't moves 3 or 4 times & I don't see the red light reflected in my hand.
As per your advice I have to look for in the chip that makes the focus?
Check the obvious things first like all the supplies. Is the focus coil drive IC receiving voltage. Also worth confirming all mechanical operation is correct and the tray limit switches (or whatever detection it uses) is good.
I measured in the spindle IC:
-12,15V
+13,08V
Have to be:
-13,8V
+14V
I suppose the IC spindle is well supplied
I measured the IC focus:
-11,94V
+13,26V
Have to measure
-13.8V
+14V
More or less the measured voltages are OK not?
-12,15V
+13,08V
Have to be:
-13,8V
+14V
I suppose the IC spindle is well supplied
I measured the IC focus:
-11,94V
+13,26V
Have to measure
-13.8V
+14V
More or less the measured voltages are OK not?
They seem OK.
Next checks would be to jump in and check on a scope to see if the servo IC (assuming you can get at this point) is outputing a focus search "ramp" waveform and to see if that reaches the drive IC. Don't overlook possibility of connection problems to the pickup such as a damaged foil etc.
If that shows nothing then I would look at all the pins on the system control IC with a scope and make sure all are as expected. Make sure any inputs from mechanical switches are reaching the IC.
Next checks would be to jump in and check on a scope to see if the servo IC (assuming you can get at this point) is outputing a focus search "ramp" waveform and to see if that reaches the drive IC. Don't overlook possibility of connection problems to the pickup such as a damaged foil etc.
If that shows nothing then I would look at all the pins on the system control IC with a scope and make sure all are as expected. Make sure any inputs from mechanical switches are reaching the IC.
I measured the IC focus:
+1V
-1,275V
Have to be:
0.9V
-1.0V
It seems the focus is IC is OK because is outputing the voltage required as per service manual.
+1V
-1,275V
Have to be:
0.9V
-1.0V
It seems the focus is IC is OK because is outputing the voltage required as per service manual.
Last edited:
Mooly you'r very kind, if sometime you need something that I can do for you don't hesitate to contact me.