Sony HCD -A 490. Correct position for this assembly? - UK Vintage Radio Repair and Restoration Discussion Forum

vinrads · 26th Jan 2023, 3:52 pm

I have just fitted belts to both decks, one deck worked one way the other door won't open. Can anyone tell me the correct position for the assy shown in picture?

Thanks, Mick.

Kentode · 27th Jan 2023, 10:57 am

Try Manualslib, from page 42 onwards there's lots of exploded diagrams. I can't match your picture to the diagram but you might be able to, Mick.

Hope this helps.

vinrads · 27th Jan 2023, 11:23 am

Thanks for that Ken that may help ,Mick.

Nickthedentist · 27th Jan 2023, 11:26 am

The sharp "corners" on that belt path look very wrong to my eyes.

vinrads · 27th Jan 2023, 11:31 am

Hi Nick that's a clever way of holding the belts in position until you get the two parts of the deck together, then you slide the belt off the pins and onto the pulley, same goes for the flat belt. Mick

Nickthedentist · 27th Jan 2023, 12:06 pm

Ah! Sorry.

Reminds me of the "hook" on cheap BSR turntable's platters.

vinrads · 31st Jan 2023, 9:35 am

Update on the Sony, belts fitted now I have a couple of problems the Left deck runs very fast the right deck works but chews tape due to intermittent no take up, any suggestions as what to look for?

Mick.

vinrads · 31st Jan 2023, 2:39 pm

I have cured the problem regarding the fast speed it was a split in the connecting ribbon. Still have the no take up on the r/h deck. Mick.

vinrads · 1st Feb 2023, 8:54 pm

I am now in need of a couple of pinch rollers, can anyone help? This one is testing my sanity.

Mick.

ben · 1st Feb 2023, 10:58 pm

That is the TCM-190 mech. Run away!!

I made a video on this mech years ago, can't find it now but here's one that my be of use.

The poor take-up rings a bell, but it's been about 8 years since I last worked on one of these. Check the main cam position and its arm. At least you have a working deck to compare it to, so shouldn't be too hard to work out what is wrong.

EDIT: The small cog on the motor tends to crack and not drive the brakes and winding properly, have you checked it?

vinrads · 2nd Feb 2023, 10:19 am

Thanks Ben, the no take up appears to be caused by two cogs not quite meshing, moving the main cam slightly seems to cure it. I can't see why the cam is not stopping in the correct position, the small cog does have a split I squeezed a split washer over it seems to be OK.

Mick.

26th Jan 2023, 3:52 pm	#1
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Sony HCD -A 490. Correct position for this assembly? I have just fitted belts to both decks, one deck worked one way the other door won't open. Can anyone tell me the correct position for the assy shown in picture? Thanks, Mick. Attached Thumbnails

27th Jan 2023, 10:57 am	#2
Kentode Octode Join Date: Mar 2015 Location: Yorkshire, England. Posts: 1,268	Re: Sony HCD -A 490 help req Try Manualslib, from page 42 onwards there's lots of exploded diagrams. I can't match your picture to the diagram but you might be able to, Mick. Hope this helps. __________________ Regards, Ken. BVWS member

27th Jan 2023, 11:23 am	#3
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490 help req Thanks for that Ken that may help ,Mick.

27th Jan 2023, 11:26 am	#4
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,558	Re: Sony HCD -A 490 help req The sharp "corners" on that belt path look very wrong to my eyes.

27th Jan 2023, 11:31 am	#5
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490 help req Hi Nick that's a clever way of holding the belts in position until you get the two parts of the deck together, then you slide the belt off the pins and onto the pulley, same goes for the flat belt. Mick

27th Jan 2023, 12:06 pm	#6
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,558	Re: Sony HCD -A 490 help req Ah! Sorry. Reminds me of the "hook" on cheap BSR turntable's platters.

31st Jan 2023, 9:35 am	#7
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490 help req Update on the Sony, belts fitted now I have a couple of problems the Left deck runs very fast the right deck works but chews tape due to intermittent no take up, any suggestions as what to look for? Mick.

31st Jan 2023, 2:39 pm	#8
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490. Correct position for this assembly? I have cured the problem regarding the fast speed it was a split in the connecting ribbon. Still have the no take up on the r/h deck. Mick.

1st Feb 2023, 8:54 pm	#9
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490. Sony HCD -A 490. Correct position for this assembly? I am now in need of a couple of pinch rollers, can anyone help? This one is testing my sanity. Mick.

1st Feb 2023, 10:58 pm	#10
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,325	Re: Sony HCD -A 490. Sony HCD -A 490. Correct position for this assembly? That is the TCM-190 mech. Run away!! I made a video on this mech years ago, can't find it now but here's one that my be of use. The poor take-up rings a bell, but it's been about 8 years since I last worked on one of these. Check the main cam position and its arm. At least you have a working deck to compare it to, so shouldn't be too hard to work out what is wrong. EDIT: The small cog on the motor tends to crack and not drive the brakes and winding properly, have you checked it? __________________ Regards, Ben.

2nd Feb 2023, 10:19 am	#11
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,655	Re: Sony HCD -A 490. Sony HCD -A 490. Correct position for this assembly? Thanks Ben, the no take up appears to be caused by two cogs not quite meshing, moving the main cam slightly seems to cure it. I can't see why the cam is not stopping in the correct position, the small cog does have a split I squeezed a split washer over it seems to be OK. Mick.