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Sharp GF-777 Sound Balance Issue


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#1 Crunchy_JuiceBox84

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Posted 07 April 2016 - 12:20 PM

As I was recently listening to my 777 I realized that the sound is more favored on the right channel than the left. To get balanced sound I have to put the balance knob almost all the way on the left channel. Could this be a speaker issue or something more serious like an amp issue?

#2 soundboy

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Posted 07 April 2016 - 10:37 PM

have you made sure the device is not the problem maybe on radio if the problems persist I would consider contact spray

#3 toshik

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Posted 08 April 2016 - 05:50 AM

Spray the balance pot most likely it would fix the issue

#4 BoomboxLover48

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Posted 08 April 2016 - 06:10 AM

You need to remove the chassis out and spray inside the balance potentiometer and turn it back and forth several times. During that time do the same to other pots also and the long record switch and move the switch manually like 30 times.

 

 

 

I even opened up all the pots and did a good cleaning but was lacking treble on the left channel. I changed the whole amplifier section with no effect.

I tried replacing tweeters not no effect and finally a good cleaning of the long record switch made it work well. 



#5 Crunchy_JuiceBox84

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Posted 08 April 2016 - 11:12 AM

I will try cleaning all the pots and switches. I just get really nervous taking it apart

#6 BoomboxLover48

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Posted 08 April 2016 - 11:22 AM

I will try cleaning all the pots and switches. I just get really nervous taking it apart

I was also very nervous to take it apart but now I can do it in my sleep. 

 

Just be extra careful and have a large bench top area with styrofoam pads to lay parts. I think it is easy to take apart and work on when compared to other boxes that are smaller and is fully packed.

 

Download Site owner Bobby's (fatdog's) step by step instructions that really helps. 

 

https://boomboxery.c...t-repair-guide/

 

I am still nervous to work on a Sanyo M9998.  :w00t:  :lol:  :lol:

I have two that needs belt replacement. 



#7 Crunchy_JuiceBox84

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Posted 08 April 2016 - 01:28 PM

I was also very nervous to take it apart but now I can do it in my sleep.

Just be extra careful and have a large bench top area with styrofoam pads to lay parts. I think it is easy to take apart and work on when compared to other boxes that are smaller and is fully packed.

Download Site owner Bobby's (fatdog's) step by step instructions that really helps.

https://boomboxery.c...t-repair-guide/

I am still nervous to work on a Sanyo M9998. :w00t: :lol: :lol:
I have two that needs belt replacement.


Thanks I will download that and get to work!

#8 toshik

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Posted 09 April 2016 - 12:01 AM

Just don't use the belts sizes noted in that manual they are wrong! I sprayed mine without taking everything apart.

#9 BoomboxLover48

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Posted 09 April 2016 - 07:19 AM

Main belts are FBS11.5 and SBS6.0

Counter belt is SBS 7.4 



#10 Crunchy_JuiceBox84

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Posted 09 April 2016 - 09:29 AM

Just don't use the belts sizes noted in that manual they are wrong! I sprayed mine without taking everything apart.

I was able to do the same.



#11 Crunchy_JuiceBox84

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Posted 09 April 2016 - 09:32 AM

Main belts are FBS11.5 and SBS6.0

Counter belt is SBS 7.4 

Thanks! Belts seem pretty good for now, Ill make a note of these for future reference.

 I do notice a difference in sound, thank you for all the info.



#12 davebush

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Posted 10 April 2016 - 01:53 AM

I will try cleaning all the pots and switches. I just get really nervous taking it apart

Fortune favours the brave



#13 BoomboxLover48

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Posted 10 April 2016 - 06:53 AM

Thanks! Belts seem pretty good for now, Ill make a note of these for future reference.

 I do notice a difference in sound, thank you for all the info.

Buy and keep them handy because they can fail sooner or later and can replace those next time you remove the chassis.



#14 grig15

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Posted 09 July 2018 - 07:55 AM



You need to remove the chassis out and spray inside the balance potentiometer and turn it back and forth several times. During that time do the same to other pots also and the long record switch and move the switch manually like 30 times.

 

 

 

I even opened up all the pots and did a good cleaning but was lacking treble on the left channel. I changed the whole amplifier section with no effect.

I tried replacing tweeters not no effect and finally a good cleaning of the long record switch made it work well. 

 

 

I need to clean my device pots too. But I dont understand where is the  [long record switch]. Can you explain me where it is?

Thanks



#15 Fatdog

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Posted 09 July 2018 - 12:09 PM

I need to clean my device pots too. But I dont understand where is the  [long record switch].

Can you explain me where it is?
Thanks

Hey, Grigor, see this post:

https://boomboxery.c...ch-bar-example/