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I've got myself a GF-999 need advise on pinch roller, power supply etc.


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#1 toshik

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Posted 29 September 2015 - 01:10 PM

I've got bored by National RX-7200s, so got myself a GF-999.
There is nothing much there for me to do in terms of FM tweaking since it's already there. :yes:
So all I need to do is a basic restoration - clean-up, lubrication and belts replacement.
I need some advise on pinch rollers sizes please, the seach did not reveal actual mm dimentions. Since National uses a unique from the common size I won't be surprised Sharp followed the lead. I'm pretty sure they are same size as GF-777 brother but I don't physically have the box to measure the old ones.
And also possibility of installing GF-777 power supply PCB? I'd imagine that I'd need at least to cut a hole in the rear case for round voltage selector. Or maybe install a proper size transformer hardwired for 120vac onto original pcb like I did in the past.



#2 toshik

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Posted 02 October 2015 - 07:40 PM

I see two possibilities here: either we don't have any more Sharp owners or they no longer visit the site :-)

Oh, there is the last one - a sticky with those sizes I fail to see :-) :-)

Whatever model I work on myself I create a file with all belts and pinch rollers sizes for future reference.



#3 baddboybill

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Posted 02 October 2015 - 08:54 PM

Sharp pinch rollers are same size as other brands. Just replaced one on VZ2000. You can get new ones here. http://www.studiosou...om/cassette.htm


Bad Boy Bill

#4 toshik

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Posted 02 October 2015 - 09:31 PM

Thanks! So they are 13x6.4x2.8?

#5 toshik

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Posted 03 October 2015 - 05:23 PM

LOL, more silence was the answer :-)

What is the power transformer size?



#6 baddboybill

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Posted 03 October 2015 - 06:32 PM

Thanks! So they are 13x6.4x2.8?


Yes about that size. Trust me they work 😉


Bad Boy Bill

#7 baddboybill

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Posted 03 October 2015 - 06:33 PM

LOL, more silence was the answer :-)
What is the power transformer size?


Specs are on back case for power usage


Bad Boy Bill

#8 toshik

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Posted 03 October 2015 - 06:44 PM

Specs are on back case for power usage


Bad Boy Bill

 

OK and what does the back cover have to do with the power transformer SIZE ? :drool:



#9 baddboybill

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Posted 03 October 2015 - 07:48 PM

Gives you voltage and wattage. Can't have any transformer less than wattage consumed. Plus it's a 15v dc so transformer need to be that.
. Posted Image


Bad Boy Bill

#10 toshik

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Posted 03 October 2015 - 07:55 PM

I need physical dimentions of the actual metal transformer on PCB, not hypothetical numbers from the back label :-)

In another words transformer height, width and length, actual numbers in mm or inches.

I look only for the exact match. Anything else won't fit the PCB!



#11 baddboybill

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Posted 03 October 2015 - 08:56 PM

Check eBay Chinese sellers are always selling parts for gf777 and those will fit


Bad Boy Bill

#12 toshik

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Posted 08 October 2015 - 08:05 PM

What is the AC output voltage from the transformer?

Transformer shell size would be great, however last time I could not get the answer....

 

For everyone else wondering, off US 120VAC original Japan transformer outputs 16.2VAC with no load, multivoltage version transformer outputs only 14.6 VAC



#13 toshik

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Posted 11 October 2015 - 09:12 AM

It was supposed to be delivered tomorrow if not for stupid USPS holiday :-) 



#14 riker1068

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Posted 12 October 2015 - 11:19 AM

:blink:



#15 toshik

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Posted 12 October 2015 - 11:37 AM

Yep sitting at my postal station today without move.



#16 riker1068

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Posted 12 October 2015 - 12:09 PM

I had a pick up set for saturday to deliver to brazil. Pick up was confirmed and becer showed up. Git a email saturday, sorry for inconvience and will pick up on tuesday. What a crock up wet brown stink mud. I hate usps!

#17 toshik

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Posted 14 October 2015 - 08:44 AM

Ok it arrived yesterday with no ADDED damage whatsoever, today I have some time to dig into it. 

Mint to VG condition surely very minor pitting and yes there are things to work on in order to make it 100%.

Can use some advise unless I'd be faster fixing the things up :-) I know RX-7000/7200 in and out but this is first time I work of Sharp.

There are 2 issues I have.

Since everyone knows how GF-999 looks like, I'm not posting pictures yet.



#18 toshik

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Posted 14 October 2015 - 05:07 PM

Both decks are running strong on the original belts with almost no wear to the heads, however there is an issue I did not address yet: right channel is completely out, I'd imagine balance or volume pot needs some heavy spraying



#19 stosoorok

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Posted 14 October 2015 - 11:59 PM

I would try to clean volume pot first! Actually clean all, once you take it apart.

 

https://boomboxery.c...rp-gf-777-pots/



#20 toshik

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Posted 15 October 2015 - 01:30 PM

Will do! One more piece of puzzle - I found tiny spring and some black plastic piece inside the case upon the first opening under the cassette mechanism (my snake eyes).

I was rebelting and re-pinch rolling today and found somewhat broken switch behind the right deck FF button (buttons assembly removed on the picture), looks missing the pusher and broken to me!

Attached Files



#21 toshik

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Posted 15 October 2015 - 09:19 PM

For everyone else who'd work on this: the belts sizes (FBM11.5 and SBM6.0) noted in the General Disassembly Instructions by Fatdog are unfortunately wrong size (IMHO too big). I purchased them ahead of time based on this instruction without taking any measurements of the actual mechanism. 

The correct types are FBS11.5 and SBS6.0

I put the original old belts in for now.

Counter belt SBS7.4 is ok



#22 toshik

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Posted 16 October 2015 - 11:35 AM

Surely it was the volume pot, I did not take everything apart, just carefully sprayed it through the front hole while the frame was out the case.



#23 toshik

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Posted 17 October 2015 - 08:19 PM

Since I'm back to original 35-years old belts I tried to get the correct sized FBS11.5 and SBS6.0. I normally purchase from studiosoundelectronics.com they are pretty reasonable and local to me but to my surprise they don't have both sizes!

 

Update: studiosoundelectronics suggested to use FBS11.0 and SBS6.2



#24 BoomboxLover48

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Posted 18 October 2015 - 11:41 AM

Since I'm back to original 35-years old belts I tried to get the correct sized FBS11.5 and SBS6.0. I normally purchase from studiosoundelectronics.com they are pretty reasonable and local to me but to my surprise they don't have both sizes!

 

Update: studiosoundelectronics suggested to use FBS11.0 and SBS6.2

 

What of FBS 11.0 and SBS 5.6? SBS 6.2 is 0.2 loose. 



#25 rwilhi

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Posted 02 February 2016 - 01:25 PM

Since I'm back to original 35-years old belts I tried to get the correct sized FBS11.5 and SBS6.0. I normally purchase from studiosoundelectronics.com they are pretty reasonable and local to me but to my surprise they don't have both sizes!

 

Update: studiosoundelectronics suggested to use FBS11.0 and SBS6.2

Did you figure out what power supply would work? I am trying to change my power supply in my Toyota asin ea900 which is based off the 909.. Did the 777 power supply work?



#26 toshik

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Posted 02 February 2016 - 01:30 PM

The board is 100% identical it's a direct swap 2 or 4 screws, connector is the same. I think the cutout in the rear panel for voltage switch is covered by something in japanese version. So preset it for your voltage prior to installation. I don't have this radio anymore so can't picture anything.

Attached Files



#27 rwilhi

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Posted 03 February 2016 - 12:13 AM

The board is 100% identical it's a direct swap 2 or 4 screws, connector is the same. I think the cutout in the rear panel for voltage switch is covered by something in japanese version. So preset it for your voltage prior to installation. I don't have this radio anymore so can't picture anything.

What power supply is that? The 777z Multi?