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Hi I’m new! Onkyo turntable help.

J

Jeremy Costa

New Member
584049B1-09F4-4571-A8B1-CB9FFAC4CD48.jpeg 3404667A-343B-437F-A470-54A024A2E1B7.jpeg 38E6A937-C52E-47FD-B7F7-2789EDAEF05D.jpeg 176D24A1-2EA7-45A8-845A-9C9912B3ED70.jpeg Hi there. My name is Jeremy. I’m from Australia and I just bought a old Onkyo system from the 70’s. It is absolutely fantastic and runs like a dream. However the turn table seems to be running a bit slow like it has dropped in pitch. Almost a semitone. Anyway I have a few questions and I’m hoping someone here can help.

1.Any idea how to adjust the speed?
2.The whole turn table seems to be screwed in somehow to the actual cabinet, anyone removed one of these before ?( incase the speed adjustments are under the turntable)
3. I’ve looked for the Manuel but it doesn’t seem to exist anymore online anywhere. anyone seen it.

below is the model number and I’ll add some photos.

Onkyo Mss-7812A

View media item 20806View media item 20806View media item 20807
 
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I believe the model number is 7612A, not 7812A. The system looks to be a GX-3:

https://audiokarma.org/forums/index.php?threads/onkyo-gx-3-console-stereo-system.467751/

I can't find a manual for either the table or the system itself on the usual sources online.

Be sure the belt is in good condition and the right size(may be hard hunting without the manual for specs). Also check the platter and motor pulley are clean of any belt residue, and lube the motor and spindle.
 
Hey Stillhouse thanks for replying to this. You are correct I mistyped the model number. Thanks for the advice. The belt is good, what I’m currently trying to figure out is how to remove the actual turntable from the cabinets as it seems to be somehow attached to it, just so I can flip it over And lube it all up. The person that owned this system before me jumperEd all of the power leads through a box on the rear and it’s made it really hard to pull out the amp to look under the actual turntable to see where it is attached. I’m not a electrician and I’m a little worried about screwing things up back there.
 
Stillhouse said:
I believe the model number is 7612A, not 7812A. The system looks to be a GX-3:

https://audiokarma.org/forums/index.php?threads/onkyo-gx-3-console-stereo-system.467751/

I can't find a manual for either the table or the system itself on the usual sources online.

Be sure the belt is in good condition and the right size(may be hard hunting without the manual for specs). Also check the platter and motor pulley are clean of any belt residue, and lube the motor and spindle.
Click to expand...
 
Jeremy Costa said:
View attachment 1746103 View attachment 1746104 View attachment 1746105 View attachment 1746106 Hi there. My name is Jeremy. I’m from Australia and I just bought a old Onkyo system from the 70’s. It is absolutely fantastic and runs like a dream. However the turn table seems to be running a bit slow like it has dropped in pitch. Almost a semitone. Anyway I have a few questions and I’m hoping someone here can help.

1.Any idea how to adjust the speed?
2.The whole turn table seems to be screwed in somehow to the actual cabinet, anyone removed one of these before ?( incase the speed adjustments are under the turntable)
3. I’ve looked for the Manuel but it doesn’t seem to exist anymore online anywhere. anyone seen it.

below is the model number and I’ll add some photos.

Onkyo Mss-7812A

View media item 20806View media item 20806View media item 20807
Click to expand...
Hey Jeremy

I just got a hold of Onkyo GX 5 system, which is very similar to your GX 3. i am having the same issue with taking the turntable out of the cabinet. Its motor pulley seems to be on the wrong angle, which is causing the belt to rub against the guiding arm. Did you eventually get the turn table out to work on it? If so how?

Thanks mate
 
Is it a suspended turntable?
Try taking the platter off and posting a good picture of the area under the platter. On many Japanese belt drives from that era the whole unit lifts out of the plinth.
Is the pulley also skewed if you take the belt off?
If not your belt may be the wrong size.
 
Jens Sinding said:
Is it a suspended turntable?
Try taking the platter off and posting a good picture of the area under the platter. On many Japanese belt drives from that era the whole unit lifts out of the plinth.
Is the pulley also skewed if you take the belt off?
If not your belt may be the wrong size.
Click to expand...
Hey Jens thanks for your reply.

You are correct. The whole unit just lifts out. The issue was the motor mounts were completely squashed and falling to pieces. i have found rubber grommets and rubber washers to fix the issue. Its now running nicely. I do think the timing is slightly off. New belt perhaps?
 
Probably. If the belt still sits snugly on the inner platter when you take it of the pulley it is probably all right. That said it may not be the correct belt. If it runs slow the belt is too thin and if fast it is too thick.
If it is just a bit too slow you can varnish the pulley with nail varnish a very thin layer at a time until you get the right speed. It works really well and lasts a long time.
 
Jens Sinding said:
Probably. If the belt still sits snugly on the inner platter when you take it of the pulley it is probably all right. That said it may not be the correct belt. If it runs slow the belt is too thin and if fast it is too thick.
If it is just a bit too slow you can varnish the pulley with nail varnish a very thin layer at a time until you get the right speed. It works really well and lasts a long time.
Click to expand...
I tested the speed with an rpm app on the phone. it runs between 32.2 - 32.8. Using the the 33rpm function.
 
That’s not good and I would suggest that you service the spindle and motor.
Sewing machine oil will be fine for lubricating the spindle after getting rid of the old oil, and also for the motor.
If you look for threads about servicing a Pioneer PL-12D or similar you will get helpful info.
These tt’s are very similar in construction.
A few pictures would be nice :)
 
I've lubed up the spindle and motor, but no improvement.

I believe the belt is the issue. Photos 1000002191.jpg1000002192.jpgattached

as well as some photos of the unit itself 1000002188.jpg1000002189.jpg1000002190.jpg
 
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