I haven't heard of this one. Wondering if there's too much friction in the system. Doesn't make too much sense as the tray switches control the motor stop IIRC.
Jon
Jon
If I disconnect the stop switch, it has no effect.
It is as if the motor does not run for long enough!
I have thoroughly checked and cleaned the drawer - no hard grease etc.
Andy
It is as if the motor does not run for long enough!
I have thoroughly checked and cleaned the drawer - no hard grease etc.
Andy
This is just a supposition as I have no experience with this player however;
Try measuring the voltage on the motor drive. If it is lower than expected the main smoothing cap on the supply to the motor may be drying out and thus alot smaller than expected. Replacing this may fix your problem as without the cap the supply won't hold up between mains cycles. I have seen this in other CD players.
Regards,
Andrew
Try measuring the voltage on the motor drive. If it is lower than expected the main smoothing cap on the supply to the motor may be drying out and thus alot smaller than expected. Replacing this may fix your problem as without the cap the supply won't hold up between mains cycles. I have seen this in other CD players.
Regards,
Andrew
Thanks for the replies.
What I don't know is the period of the 'pulse'.
I will try replacing the caps around the driver chip.
Andy
What I don't know is the period of the 'pulse'.
I will try replacing the caps around the driver chip.
Andy
Hi, the main smoothing cap for the power supply is unlikely to be near the driver chip. Since the previous poster appears to have the CCT diagram he may be able to tell you which one to look at. I wouldn't blindly replace bits you are likely to spend alot of time and money and may not fix anything.
Regards,
Andrew
Regards,
Andrew
Hi
The driver chip has a local 33uF cap (bypassed) on each rail.
The +10v rail has a 4700uF with a 3300uF on the -10v rail.
I have the circuit diagrams.
Andy
The driver chip has a local 33uF cap (bypassed) on each rail.
The +10v rail has a 4700uF with a 3300uF on the -10v rail.
I have the circuit diagrams.
Andy
Hi all,
Glad I came across this thread. I have an Alpha 5 and the tray over run on eject has worried me for a while, so I'll try the resistor trick to slow the motor down. Only thing is I'm not sure what wattage resistor to use? I'm guessing smallish would be OK as it doesn't stay powered on for long but thought I'd ask?
I know about the weak drive gears and have replaced mine but can't help thinking the motor over run must be partly to blame for their demise?
Regards,
Tyron
Glad I came across this thread. I have an Alpha 5 and the tray over run on eject has worried me for a while, so I'll try the resistor trick to slow the motor down. Only thing is I'm not sure what wattage resistor to use? I'm guessing smallish would be OK as it doesn't stay powered on for long but thought I'd ask?
I know about the weak drive gears and have replaced mine but can't help thinking the motor over run must be partly to blame for their demise?
Regards,
Tyron
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