Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Panasonic DVD #SA-HT75

I replaced the spindle motor in this since it wasn't working, and it
still doesn't work. Does anyone have experience with this particular
model, such as expected motor voltage, or a driver circuit that I
should check? I don't have the schematic, this is why I am asking for
help. Thanks group.

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Default Panasonic DVD #SA-HT75

What do you mean it wasn't working?
The spindle motor did not run at all?
Or the DVD player wasn't working and you guessed it was the spindle
motor?

Did you precision adjust the platter height if you just replaced the
motor?
Did you perform the laser auto adjustments per the service manual?

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Default Panasonic DVD #SA-HT75

What troubleshooting did you FIRST perform in order to diagnose that
the spindle motor was faulty?? When you replaced the motor did you
align the hub to the proper and critical height??
In most DVD and CD players, if the laser does not focus for a variety
of faults, then the spindle motor will receive voltage and not turn, so
don't expect any spindle motor motion until you verify that the laser
is emitting and focus lock is achieved and verified.
You may want to go to the website for this newsgroup at
http://www.repairfaq.org/
there, with some searching, you will find a wealth of troubleshooting
tips, repair proceedures, component testing methods and important
safety information.
electricitym
..
..
..

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Default Panasonic DVD #SA-HT75


wrote:
What troubleshooting did you FIRST perform in order to diagnose that
the spindle motor was faulty?? When you replaced the motor did you
align the hub to the proper and critical height??
In most DVD and CD players, if the laser does not focus for a variety
of faults, then the spindle motor will receive voltage and not turn, so
don't expect any spindle motor motion until you verify that the laser
is emitting and focus lock is achieved and verified.
You may want to go to the website for this newsgroup at
http://www.repairfaq.org/
there, with some searching, you will find a wealth of troubleshooting
tips, repair proceedures, component testing methods and important
safety information.
electricitym
.
.
.I apologize for the lack of info originaly, now I know why this was needed. The problem was "disk error" message being displayed when a DVD was inserted. The motor wouldn't turn in this process, so figured this is why the error message. I removed the motor/laser deck assembly, connected a 5 volt dc supply to the motor to see if it would run, it didn't. I turned the shaft manually to a slightly different postion and re-applied voltage, and the motor worked. Using this method, I could get the motor to work about 10% of the time every time I applied the 5 volt supply. I figured this was definetely a motor problem and replaced with a new one as stated. I was aware about the hub height adjustment, but thought this would be made with the motor turning a DVD to provide some sort of feedback while being read. The laser is still working as it was in the beginning, but not sure about the focus lock thing, since I am really unfamiliar with DVD player repair. It is looking like my original problem may not have been a motor fault based on the replies I have received. I will do some research on the laser assembly function as suggested, and post my findings/results, further questions soon. Thanks to all who replied.


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Default Panasonic DVD #SA-HT75

The player was displaying "disk error". Figuring the disk had to spin
to be read, and wasn't, assumed a bad motor. I haven't aligned the hub
yet, because I thought the laser had to be reading a disk to be aligned
(feedback while aligning). The laser is emitting, but I was, and am
unfamiliar with focus and lock. I will check out the suggested
newsgroup for info that I am obviously in big need of. The cost of
replacing the motor is of no big deal to me, since I do this as a
hobby, and realize I will make these kind of mistakes along the way.
I'm not verify familiar with DVD repair or operation, which is why I
was unaware of the above focus, lock, etc. You mentioned the motor will
receive a voltage to prevent coming on? Do you know what the normal
operating voltage/and shut down voltage should be? I'll post
results/more questions as I get them. I do appreciate the reply and
info. Thanks to all.



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Default Panasonic DVD #SA-HT75

I have read some good info on the start up operation/focus. I'm almost
positive I replaced the motor for nothing. Now, assuming I have a focus
problem, I don't know how it was out of focus in the first place. This
may be the original fault. Is it unheard of to have to perform focus
adjustment with no prior invasion of the player, or misuse? I was given
the code to access the built in anti jitter software. I will attempt to
do this today. Be back soon. Thanks again.

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sofie
 
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Default Panasonic DVD #SA-HT75


wrote in message Is it unheard of to have to perform
focus
adjustment with no prior invasion of the player, or misuse?



YES... obviously.... of course things can break, become faulty and need
repairing even "with no prior invasion of the player, or misuse"
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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