I am looking at a Panasonic DVD player #SA-HT75. Insert disk, dispays reading, then after a few seconds displays no disk. Tried different disks with same results. Tried cleaning the laser, but no change. I checked the voltage on the motor that drives the disk and no problem here. I did this because I noticed when the disk is inserted, it doesn't turn. The laser module slides back and forth like it's supposed to. Shouldn't the disk spin when inserted to be read? is the best course of action, replace this as a module if available, or the motor if this is the fault. Thanks all.
It is very common for the spindle motor to cause problems on these players. You are correct in that the disc should spin up at the time it starts to try to read it. Usually, if you use a finger to spin up the disc ( clockwise from the top ), it will carry on and read the disc successfully.
Replacing this motor is not as easy as you may think, if you have no experience of doing it. It comes as part of the subdeck, with the turntable already fitted, as the height of this is critical. However, you also have to swap over several gears, the laser, and the laser slide bars. When this is done, and the deck is reinstalled, the laser then has to be adjusted for tilt. This is accomplished by invoking the built in software jitter meter, and adjusting the three allen screws under the slide bars, for minimum jitter factor.
Unless you are experienced in this sort of work, I really wouldn't recommend that you try, to be honest, as you may finish up causing yourself even more trouble. Take it to a dealer, who will be well versed in the procedures involved, and should be able to give you an over-the-counter quote for the work.
Thankyou very much for the info. This is exactly the kind of response I like to get when I post a question. Very informative. Now I propose another question.... my buddy may scrap the thing if it costs too much for repair. I'm fairly new at repair, but am charging friends replacement and shipping costs for repair only (no labor). I do this for the learning experience. If I ever total srew up a peice of equipment, I am willing to pay for it. I figure this would be the cost of my training. So.........I do see how to dis-assemble the sub deck (already have the drive assembly removed), but I was unaware of built in anti jitter software. I will research for a replacement motor, but would you have any more info on how to access the jitter software and it's use? Thankyou again.
May I suggest that you list the model in the subject line. I hve not followed the thread and just picked it up. Nowhere in the post below does it mention what unit you need a manual for. Now if I see a post like this and can help, I am likely to. If I have to go digging through old posts to find the model, not a chance.
Leonard: Here is the #1 posting by "stok".... you will find the Make and Model in his very first sentence. ..... your reply post was #4. electyricitym
"From: snipped-for-privacy@cox.net - I am looking at a Panasonic DVD player #SA-HT75. Insert disk, dispays reading, then after a few seconds displays no disk. Tried different disks with same results. Tried cleaning the laser, but no change. I checked the voltage on the motor that drives the disk and no problem here. I did this because I noticed when the disk is inserted, it doesn't turn. The laser module slides back and forth like it's supposed
to. Shouldn't the disk spin when inserted to be read? is the best course of action, replace this as a module if available, or the motor if this is the fault. Thanks all." . . .
As I recall, you press " Tune Mode ( Stop ) " simultaneously with " 5 " on the remote control. This should change the display to " JIT xxx " where xxx is the jitter value in percent, with the disc running, so a reading of " JIT
125 " would represent 12.5%, for example. Once you have the JIT display up, press play, and let the disc run up, and play normally. Then move a few chapters into the disc, and note the jitter figure. The 12.5% in the above example, would be too high. You are aiming to get the jitter factor down below 10%, and 6.5% ( reading " JIT 065 " in the display ) is often obtainable. Consider yourself to be doing well, though, if you can achieve
8.9%.
It's not easy to adjust the allen screws. With the deck in place, they are accessible through three holes in the lower chassis pan, but one at the front, is partially covered, as I recall, by the front panel, so you have to have this unscrewed and pulled forward. Stand the player on four coffee mugs to get your allen key up into the holes. Only adjust half a turn at a time, usually clockwise on a new deck ie like tightening a normal screw, and withdraw the tool and let the deck resettle after each adjustment. When you see the figure just start to come down, move round to the next adjuster screw, and do this one until the figure again starts to drop, then do the third one. When you have got them all to this point, keep going round them in turn until you can get no further improvement. You may need to back one or more of the screws off from the initially reached position, to obtain best reading. If you can imagine, what you are doing is ' rocking ' the laser in two planes, to get it absolutely parallel to the disc, the position of which is governed by the turntable, which is in turn, a function of how well the motor fits in the plastic deck.
Hope you manage it ok !! You can always mail me direct if you get in trouble with it, rather than making the thread go on for ever in the group.
My point was a general one...if someone wants specific help with anything, it is a good idea to post the model and problem in the subject line. It could have been the immediately preceding post and would not change the point. I had just cleaned out my local newsgroups and am not going to bother to go dig up the post only to find out that I don't have the manual anyway. The point is, if people want help, they need to make it likely that others will see their needs.
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