hi - new here

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Bill656

Bill656

Member (SA)
HI,

I used to own a JVC-656 here in the 80's, had it as the primary back seat stereo in my old chevette until 1991 wherby i had an accident and the car ended up on top of the JVC..

it was a bit smashed / flexible after but did actually still work.. :eek:

Anyway, i have just bought another, in excellent condition apart from the tape deck .. i ordered new belts from a german website and have fitted them and also replaced the perished motor mount rubbers.

it still will not play tapes though.. i have cleaned the capstan roller and bypassed the failed switch contacts (on the radio/tape selector) for now so the motor runs..

if i press play partly it will play but one it is heads towards fully in there is no drive.. the capstan doesn't seem to work under load.

i am guessing it maybe the bearing for it that is defunkt.. the wheel seems in good condition and i have cleaned/degreased it etc..

I deally wanted to get it working to strap into the back of my classic 80's car for a show in a couple of weeks but as it is the only bit not working is the tape deck..

any advice please?

thanks

Bill
 
Northerner

Northerner

Boomus Fidelis
Welcome to the forum :)

Advice?...buy a new one lol ;)

Got a minty fully working one I could sell you if you like...what country are you in?
 
Bill656

Bill656

Member (SA)
hi,

a new tape deck :eek: ?

I am in the same country as you it seems :) , but down souf in Sussex ..

I would be seriously interested in whatever can be done in a short period of time to restore the deck :)

cheers

Bill

Northerner said:
Welcome to the forum :)

Advice?...buy a new one lol ;)

Got a minty fully working one I could sell you if you like...what country are you in?
Click to expand...
 
Bill656

Bill656

Member (SA)
thanks for the info.

i looked at the links and it seems so far that the clutch and idlers all seem to be functioning... the tape will rewind and fast forward.. it just refuses to grip/move the tape when play id pushed in fully. this i am assuming is the spindle/wheel. the motor and spindle continue to spin and if i take the tape out and loosen the "from" spool by turning it anti clock, then put it back in, the player will attempt to play until tensions is taken up again.

same if the auto stop mech is pushed to the edge of triggering, the tape will then move.. so it all seems to related to the capstan drive :(

it isnt eating tape and i can feel notable resistance if i put my finger on the take up spool shaft in play mode.. the shaft that goes against the friction / capstan wheel appears to wobble if pushed.

I have already adjusted the flywheel spring to gain about 0.2 to 0.3 mm play as per the service manual , it was somewhat more.. adjustign this either way has no effect on the lack of drive though :(

the box is a very clean example and still has the sticker on the tape door and the radio sounds as good as i remember :)
Bi
ll
 
Beosystem10

Beosystem10

Member (SA)
If the German seller is Revox.de from eBay, his belts for this transport mech are slightly out on size, I had mine from there but they weren't a good match at all. I then got some from Malvern Audio instead - perfect!
Nice boxes, I only bought mine last month from a forum member and I only chamged the belts because it's a bit of a habit when I get a "new" box. They must rank as one of the most reliable transports ever, so simple to work on and yet so stable. Marvellous devices, I'll probably hang on to mine and paint it to my own taste at some point.
 
superlew

superlew

Member (SA)
Is the head/pinch roller assembly fully engaging when PLAY is pushed? Is the pinch roller spinning freely? I imagine that if FF and REW are working, the capstan should be spinning.

Bill, where are you??

He's the man when it comes to decks. :yes:

P.S.: This thread's getting kind of "Techy."
 
Bill656

Bill656

Member (SA)
hi

apologies for getting techy :)

when play is down the assembly looks to be fully engaged and the pinch roller is against the shaft and turning. it doesn't require much effort to stall the pinch roller tho so am guessing this maybe part of the problem, perhaps the rubber has gone hard or something..

Northerner said he had a new one, not sure which bit he has that is new though, would be interested..

Bill
 
baddboybill

baddboybill

Boomus Fidelis
Possibly belt is little loose, or pinch roller is dry and hard. Have you tried looking at deck working while out of box to see mechanics and to watch capstan spin?
 
Beosystem10

Beosystem10

Member (SA)
He does indeed, but it seems a bit much of a coincidence that the transport fault is present with the new belts when the deck played fine with the old ones. ;-)
Unless of course this is a different set.
 
Bill656

Bill656

Member (SA)
hi,

pinch roller sounds the cuplrit then.. the belt changes made no difference to the problem in question, it did mean the rewind/fast forward worked again at full speed though :)

i got miced up with names earlier i think, the belt driven flywheel bit all works fine, although i could do with a new motor pulley as this ine has a crack in one edge rim (it does not affect operation tho it seems , yet..).

so... where can i get a pinch roller, are they generic enough? , that german site has some "cassette recorder" pinch wheels but do not specify models covered..

i coudl ask them or is there somewhere i can buy them in the uk?

How much do you want for your 656 out of interest Northerner?

cheers

Bill
 
Bill656

Bill656

Member (SA)
forgot to say, yes i have the beasty in bits so have the cassette deck out and can see all the mechanics in action... or not as the case for some things..like play..
 
baddboybill

baddboybill

Boomus Fidelis
Out of US I have no idea where to get pinch rollers. I sometimes use ones out of another unit that's in good shape. Many of the newer decks have same size pinch roller. But you have to usually use the same rim from yours because those are usually different styles ;-)
 
superlew

superlew

Member (SA)
I had a driver from work grab me a few junk decks from the dump to harvest the perfect pinch roller for my M9990. Check the curbs on trash day. It's a humbling, yet rewarding experience. :lol:
 
Beosystem10

Beosystem10

Member (SA)
Try Malvern Audio for the pinch roller. So this isn't the 656 from North London that sold last month then? Looks like I might have been thinking of the wrong one.
 
Bill656

Bill656

Member (SA)
hi,

nope i bought this from Brighton and picked it up last Sunday, was a good price and apart from the tape deck and fritzed switch is in excellent condition.

i think i will get roudn the switch by using a FET tranny circuit to switch the power instead. couldnt see pinch wheels on malvern audio's shop but will contact them and ask..

cheers

Bill
 
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