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My First boombox project is a GF-9000


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#1 Obuffalo

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Posted 16 January 2020 - 01:34 AM

Hi all about to embark on my first resto. It needs a few bits first, apparently the transformer is gone, needs a battery cover, a couple buttons and some tlc and it'll be fine (I hope). I'm gonna replace some wiring to neaten up inside but any other advice will be greatfully received.Attached File  IMG_20200114_171901.jpg   66.73K   3 downloadsAttached File  IMG_20200114_183520.jpg   108.09K   2 downloadsAttached File  IMG_20200114_183750.jpg   61.8K   0 downloadsAttached File  IMG_20200114_191952.jpg   73.63K   0 downloads



#2 Northerner

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Posted 16 January 2020 - 04:52 AM

Nice I like the 9000. I spent a ridiculous number of hours rebuilding one that got smashed. By the way a GF575 transformer works but you have to adjust the casing internally to fit it. 575’s are far more common so it might be an option

http://boomboxery.co...g-sharp-gf9000/

#3 Timecop1987

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Posted 16 January 2020 - 10:57 AM

great first project! I also enjoyed workin on my GF-9000 - i changed the speakers for a pair of Lasonic TRC-931 woofers. Pretty easy to work on for the start.

 

 

As for the missing parts such as battery-cover and sliders - you could ask member nikonfoo..best source for parts  :-D  :yes:



#4 Obuffalo

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Posted 16 January 2020 - 11:20 AM

great first project! I also enjoyed workin on my GF-9000 - i changed the speakers for a pair of Lasonic TRC-931 woofers. Pretty easy to work on for the start.

 

 

As for the missing parts such as battery-cover and sliders - you could ask member nikonfoo..best source for parts  :-D  :yes:

Cheers for that, are they much better speakers?



Nice I like the 9000. I spent a ridiculous number of hours rebuilding one that got smashed. By the way a GF575 transformer works but you have to adjust the casing internally to fit it. 575’s are far more common so it might be an option

http://boomboxery.co...g-sharp-gf9000/

I'll look into it, I saw that post, doesn't look too difficult to caress into place. Thanks



#5 Ghettoboom767

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Posted 16 January 2020 - 12:29 PM

Great radio,I am looking for one of these soon,good luck getting it going.

#6 Timecop1987

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Posted 16 January 2020 - 01:52 PM

 

great first project! I also enjoyed workin on my GF-9000 - i changed the speakers for a pair of Lasonic TRC-931 woofers. Pretty easy to work on for the start.

 

 

As for the missing parts such as battery-cover and sliders - you could ask member nikonfoo..best source for parts  :-D  :yes:

Cheers for that, are they much better speakers?

 

it really depends on what you like - as for originality the factory speakers do the thing. and IMHO they also sound quite good! Mine were dirty and had rotten surrounds (beyond repair for me) so i had to replace 'em. In my books they look and sound better than the originals.

 

good luck!!



#7 Obuffalo

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Posted 17 January 2020 - 04:21 PM

Hi again, does anyone have any photos of how there wiring looks on the inside as I'm pretty sure this is wired wrongAttached File  IMG_20200117_201417.jpg   119.19K   1 downloadsAttached File  IMG_20200117_201425.jpg   104.94K   1 downloads

I didn't do it.

Ok rewired it, now I'm getting a buzzing which I presume is the transformer issue and a mild burning smell.

#8 JVC Floyd

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Posted 17 January 2020 - 08:15 PM

I can tell you you this the wiring in these is nowhere near that sloppy looking.

#9 Northerner

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Posted 18 January 2020 - 02:18 AM

Maybe just not clipped in tidily?

#10 Obuffalo

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Posted 18 January 2020 - 08:03 AM

Yeah it was weird, all the speakers were wired up backwards so the cable was too short. Also weird thing happening, it's getting a buzzing sometimes, then sometimes the tape motor runs when I press the FF RR play ect (needs belts) but no lights come on anywhere. Any ideas

#11 Obuffalo

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Posted 19 January 2020 - 05:26 AM

Hi all, I'm kinda stuck, I was told the transformer was gone initially so I've tested the output and via mains it's 17.63v approx and with the battery it's 16.35v does this seem like it's not a transformer issue and something like caps. I've checked the caps on the board the power supply goes to and they are fine. Is this gonna be a case of complete strip and check everything because I'm not feeling qualified enough for that, 😨

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Also when I press play the motor turns even when the power button is off.



#12 Obuffalo

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Posted 23 January 2020 - 06:35 AM

Any ideas?



#13 docs

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Posted 23 January 2020 - 08:06 AM

There might be a cabling diagram in the service manual. I would try and check this to ensure all is well. I would disconnect as I went along to determine whether I get the exact same symptoms. Though it is not entirely clear what the problem is exactly?

 

There are a number of units which will play the cassette without being powered on. I think so you can listen to a tape and when it gets to the end the unit is off, meaning you don't need to get up and turn it off.



#14 caution

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Posted 23 January 2020 - 04:04 PM

Also when I press play the motor turns even when the power button is off.

 

Yes. There's an internal power switch ahead of the main power button, activated when the deck is used, so the entire box shuts down after the tape's finished. It's known as the sleep function. Tons of boxes have this feature.



What docs said :lol: didn't see your response! LOL



#15 Obuffalo

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Posted 25 January 2020 - 10:27 AM

Does anyone know if the transformer outputs voltage is correct

#16 Obuffalo

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Posted 05 February 2020 - 02:36 PM

Bump

#17 caution

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Posted 05 February 2020 - 02:47 PM

Yes they are ok.



#18 Obuffalo

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Posted 05 February 2020 - 03:10 PM

Yes they are ok.

thanks, didn't want to start without having that bit right, the other components are easy to find, that not so much.

Can someone confirm the belt sizes frx11.5 scq6.0 scx5.1 thanks

#19 Northerner

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Posted 06 February 2020 - 02:21 AM

No idea. I’ve never checked belt sizes ever, I just put on what fits from my stock. I was lucky enough to blag the remaining belt stock from a closing repair shop which makes it a lot easier!

#20 Obuffalo

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Posted 12 February 2020 - 06:41 PM

Sounds great, got a spare set? 🤣🤔

#21 Obuffalo

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Posted 14 February 2020 - 11:10 AM

Hi all, having a problem with the power amp board. After checking the caps the big one and a couple others are gone, the guy said the transformer went when he put 240v in the 110v side. With the readings I have for the transformer that seems fine but something is causing the power amp board to produce a burning smell and some smoke at one point and pop the caps. Is this symptomatic of a blown ha1392 power amp chip with all the other symptoms (buzzing speakers when powered on, tape is playing as I reattached the belt but no sound.