JVC RC M80 belts!

Hi Friends, I started working on my M80. It needs a good cleaning, switch deoxit treatment and belt replacement. I have no idea about the belt size of this model. I really love the autotuning and sound quality of this Boombox. It is a very special Boombox one will fall in love with. I need two antennas also because both got dented segments and missing tips. When all is done it will look nice. Not heavy at all on bass but nice high notes and overall quality. Tuning is so much fun. Every collector should have an M80. Any help on M80 is greatly appreciated.

Bump! Wiping tears....

Bump

I think it uses same belts as the M90.

Superduper said:

I think it uses same belts as the M90.

Click to expand...

Thanks Norm!

Cleaned it all up! Both channels working very good and powerful! It is pretty easy to open up the M80. I need antennas and belts.

Spend all Friday evening till 2AM on Saturday.....and again from 9AM till 4:00PM. I am so tired....I might work on it today also.

It is a more sophisticated M70 but cannot match the sound quality of M70.

This got a tiny switch get pushed inward when you put a tape to play. So basically nothing works without a tape in the deck. Very interesting!!!!


M80 got 15Watts max, 4 ohms speakers but with black paper cones.

I am looking for one switch cover also like the function switch cover or on/off, metal, CrO2, normal switch cover or mono/stereo switch cover


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The correct belt sizes are


[SIZE=medium]9.7 Inch main belt-4mm wide[/SIZE]
[SIZE=medium]4.1 Inch-1.5mm square[/SIZE]
[SIZE=medium]4.6 Inch-1,5mm square[/SIZE]

[SIZE=medium][/SIZE]

Belts all replaced but ran into a problem!

REW and FF works fine but sometimes FF wont engage but in PLAY mode the take up axle don't engage at all. Spend all day on fixing the deck but play will not engage the take reel

Could be a worn idler or clutch mechanism. I'm not sure what type of mechanism this deck uses and I could be waaayy off, but it's a thought.

Hi superlew

But what I don't understand is why the FF works most of the time. This deck is the feather touch type like the M90 deck. It lifts the head assembly up and locks in place but when the take up reel don't turn auto stop function kicks in immediately.

I checked everything with the front and back cover off.

Royce, it still sounds like a suspect idler or clutch. Especially with the "intermittent FF" symptom. With the head assembly engaged, there is more resistance on the take-up reel, and if the reel slips excessively the auto-stop will kick in. Could be a flat spot on an idler, excess lubricant, or a worn clutch. I don't have any experience with this particular deck, so, again, I could be way off. I'm kind of working it through like an "Einstein Thought Experiment."
Will the head assembly and take-up reel remain engaged when in play mode without a cassette in the deck?
I don't want to throw you off, so don't take this as "gospel."
I want to see another deck Live!

Royce did you check for idler tire under this plate? That may be whole issue

Hi Bill, Everything seems to be okay under the plate. Actually we don't see much under the plate. The clutch plate and idlers are all hidden under and hard to see unlike other models.

superlew said:

Royce, it still sounds like a suspect idler or clutch. Especially with the "intermittent FF" symptom. With the head assembly engaged, there is more resistance on the take-up reel, and if the reel slips excessively the auto-stop will kick in. Could be a flat spot on an idler, excess lubricant, or a worn clutch. I don't have any experience with this particular deck, so, again, I could be way off. I'm kind of working it through like an "Einstein Thought Experiment." Will the head assembly and take-up reel remain engaged when in play mode without a cassette in the deck? I don't want to throw you off, so don't take this as "gospel."I want to see another deck Live!

Click to expand...

. Hi Superlew, The clutch plate and idlers are all hidden and hard to see even. This is where I have a problem. A black pin like switch is there showing up his head to sense cassette. So without a cassette in the deck or keeping it pressed in none of the functions engage. The other thing is that connection wires to the deck are not long enough to see both sides of the deck in operation. Now the FF works pretty much all the time. I cannot see the idler wheel engagement mechanism from any angle. It is all hidden inside. If it was visible then we can find the root cause of it.

Have you tried to bypass or physically close the switch without a cassette in the deck? The improving FF may be an indication of shedding excess lubricant, which is a good thing. Do you have any pics of the assembly under the plate that Bill pointed out? I have to get back to my day job, but keep us posted.

I only lubricated the flywheel and no other parts. The plate when exposed show not a whole lot. The contact wheels are all under it. I need to look up if I ever took a picture under the plate. Nope I didn't. Anyway I think I have to do more evasive surgery on it. I have worked on many sophisticated decks but this is too small and wires also so short. I think Elves in Japan put it all together. Hahaha. It would be a disaster to open the main movement area without a service manual. Reminds me of opening up a Big Ben timepiece when I was 6 years old. My mother had to collect pieces that flew around the whole room and take it all to a watch repairer.

I nabbed this off S2G through a Google search. I think this idler is most likely the culprit.

Wow Superlew you made my day.

Now I can remove that part and check the problem. Thanks a lot! Now I have to take it all apart and fix the issue.

The off white gear in the middle swings both ways for FF and REW when the second motor goes forward and reverse in direction. I saw that yesterday. Actually the second motor drives the FF and REW through a gear assembly where no belts are involved.

I need to work on a very slow pace on the deck taking lots of pictures for additional reference.

I need to underlay a white thick paper before I start work and watch out for tiny springs fly away zone.

Some springs can fly away a hide to drive you nuts. Same is the case with C clip locks and tiny Teflon washers.

I want to spend some time and do it perfectly.

No Problemo! I love this kind of stuff.

I will post pictures after I am all done for helping other members who get stuck with this problem.