su-g95 schematic needed.

oxydiode · 19th March 2005, 09:07 PM

This amp started out with a blown (F1) fuse, and turned into a electronics nightmare!!! Does anyone know where I can get the schematics for this amp?

anatech · 20th March 2005, 02:00 AM

Hi oxydiode,
PM me, I can't attach the file here (too big).
-Chris

Deborah · 29th January 2006, 04:09 PM

Hi, sorry am really new, as in today, joining and mainly did so as you said you have a schematic for a Technics su-g95.
have one that gets hot, stops working, cools down starts again. have checked inside and cannot really assess the problem without a schematic.
Do you still have the schematic? If so would I be able to get a copy?

thanks everso, Deborah

Windtech · 30th October 2006, 03:07 AM

Hi Deborah and anatech,
I'm a new member here and hope you can help me out. I've been searching endlessly for a schematic for a Technics SU-G91 or SU-G95 and cannot seem to find one.
In particular, I'm trying to repair an SU-G91 that has a problem with overload shutdown. When cranked up, the unit goes into protection shutdown. At no time does the fan operate. From web searches, I see that this is not an unknown problem - I just can't find the solution without a shematic.
Any help would be greatly appreciated.
Regards
Windtech

anatech · 30th October 2006, 01:48 PM

Hi Deborah and Windtech,
Those sets tend to have a problem with solder joints. There may be poor contact where the panel mounted fan contacts the PCB.

What you do is this. Remove the bottom panel. The PCB unscrews as does the heatsink. The rear panel remains on the PCB, the front panel unplugs and comes off. The transformer remains on the bottom panel, rotate away.

Use liquid solder flux and carefully resolder all the solder joints on heatsink mounted components and rear panel mounted jacks. Clean off the flux with lacquer thinner or no-residue spray cleaner. A toothbrush works very well here. Clean the fan contacts at the rear and possibly bend them up a little. Look everything over very carefully for solder blobs and bridges. Reassemble and test.

When resoldering, try to add as little solder as possible. Too much solder will cause you grief. If you are at all uneasy with this, take your set to a really good technician. A cheap one will either rip you off or destroy your set. In that case you are further ahead to simply throw the unit out and buy a new one.

-Chris

Windtech · 30th October 2006, 10:48 PM

Thanks anatech for the quick response!
Unfortunately, I've already tried your suggestion (resoldering) with no luck. I'm really interested in getting hold of a drawing for this unit. Any scans (pdf's) of the poweramp/fan driver circuit would be ideal. I've looked at schematics for other similar circuits from Technics, but can't find one that uses the SVI3206D power amp module.
Any other suggestions?
Regards
Windtech

anatech · 31st October 2006, 01:19 AM

Hi Windtech,
The connector to the fan is probably defective. Have a good look in that area. The rear panel must come off for that.

-Chris

Windtech · 30th November 2006, 10:38 PM

Hi anatech,
The Fan connection is O.K. I'm pretty much just looking for the drawings of the SU-G91 or SU-G95. If you have a copy, or know where I can find them, I'd really appreciate it. This circuit has been dragging this repair out far too long...

Thanks again
Windtech
P.S. I'm in Georgetown ( I'm from Orangeville) on Wednesday evenings - if you can help, we could meet at Tim Horton's etc.

anatech · 1st December 2006, 01:56 AM

Hi Windtech,
I wish I could help, but I just looked for a manual or electronic version of either without success. I've repaired them before. If you want we can have a peak on my bench. I'm very close to the hospital in Georgetown.

Let me know if you are interested, I can try to help you out. Wednesday nights I have an appointment in the early evening but I'm normally back by 7:30 ish.

-Chris

Jason1976 · 7th February 2007, 01:16 PM

I have an su-g91. I had no probloms with it but i have a kenwood that would cut out and go into protect mode at higher valume . and i had to solder the chips that go to the heat sink to get it to work.

my hole technics stereo i got at a thrift store for 15 dollars. I got the su-g91 amp, st-k50 tuner, rs-tr210 tape deck, sh-8017 EQ, and the sl-pd845 cd changer. the 5 disk cd changer didn't work all it needed was the laser lens cleaned.

19th March 2005, 09:07 PM	#1
oxydiode diyAudio Member Join Date: Mar 2005 Location: texas	su-g95 schematic needed. This amp started out with a blown (F1) fuse, and turned into a electronics nightmare!!! Does anyone know where I can get the schematics for this amp?

29th January 2006, 04:09 PM	#3
Deborah diyAudio Member Join Date: Jan 2006 Location: Where my heart is.	su-g95 schematic needed Hi, sorry am really new, as in today, joining and mainly did so as you said you have a schematic for a Technics su-g95. have one that gets hot, stops working, cools down starts again. have checked inside and cannot really assess the problem without a schematic. Do you still have the schematic? If so would I be able to get a copy? thanks everso, Deborah

30th October 2006, 03:07 AM	#4
Windtech diyAudio Member Join Date: Oct 2006	Technics SU-G91/95 Hi Deborah and anatech, I'm a new member here and hope you can help me out. I've been searching endlessly for a schematic for a Technics SU-G91 or SU-G95 and cannot seem to find one. In particular, I'm trying to repair an SU-G91 that has a problem with overload shutdown. When cranked up, the unit goes into protection shutdown. At no time does the fan operate. From web searches, I see that this is not an unknown problem - I just can't find the solution without a shematic. Any help would be greatly appreciated. Regards Windtech

30th November 2006, 10:38 PM	#8
Windtech diyAudio Member Join Date: Oct 2006	SU-G91 Hi anatech, The Fan connection is O.K. I'm pretty much just looking for the drawings of the SU-G91 or SU-G95. If you have a copy, or know where I can find them, I'd really appreciate it. This circuit has been dragging this repair out far too long... Thanks again Windtech P.S. I'm in Georgetown ( I'm from Orangeville) on Wednesday evenings - if you can help, we could meet at Tim Horton's etc.

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20th March 2005, 02:00 AM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi oxydiode, PM me, I can't attach the file here (too big). -Chris

30th October 2006, 01:48 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Deborah and Windtech, Those sets tend to have a problem with solder joints. There may be poor contact where the panel mounted fan contacts the PCB. What you do is this. Remove the bottom panel. The PCB unscrews as does the heatsink. The rear panel remains on the PCB, the front panel unplugs and comes off. The transformer remains on the bottom panel, rotate away. Use liquid solder flux and carefully resolder all the solder joints on heatsink mounted components and rear panel mounted jacks. Clean off the flux with lacquer thinner or no-residue spray cleaner. A toothbrush works very well here. Clean the fan contacts at the rear and possibly bend them up a little. Look everything over very carefully for solder blobs and bridges. Reassemble and test. When resoldering, try to add as little solder as possible. Too much solder will cause you grief. If you are at all uneasy with this, take your set to a really good technician. A cheap one will either rip you off or destroy your set. In that case you are further ahead to simply throw the unit out and buy a new one. -Chris

30th October 2006, 10:48 PM	#6
Windtech diyAudio Member Join Date: Oct 2006	Thanks anatech for the quick response! Unfortunately, I've already tried your suggestion (resoldering) with no luck. I'm really interested in getting hold of a drawing for this unit. Any scans (pdf's) of the poweramp/fan driver circuit would be ideal. I've looked at schematics for other similar circuits from Technics, but can't find one that uses the SVI3206D power amp module. Any other suggestions? Regards Windtech

31st October 2006, 01:19 AM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Windtech, The connector to the fan is probably defective. Have a good look in that area. The rear panel must come off for that. -Chris

1st December 2006, 01:56 AM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Windtech, I wish I could help, but I just looked for a manual or electronic version of either without success. I've repaired them before. If you want we can have a peak on my bench. I'm very close to the hospital in Georgetown. Let me know if you are interested, I can try to help you out. Wednesday nights I have an appointment in the early evening but I'm normally back by 7:30 ish. -Chris

7th February 2007, 01:16 PM	#10
Jason1976 diyAudio Member Join Date: May 2006	I have an su-g91. I had no probloms with it but i have a kenwood that would cut out and go into protect mode at higher valume . and i had to solder the chips that go to the heat sink to get it to work. my hole technics stereo i got at a thrift store for 15 dollars. I got the su-g91 amp, st-k50 tuner, rs-tr210 tape deck, sh-8017 EQ, and the sl-pd845 cd changer. the 5 disk cd changer didn't work all it needed was the laser lens cleaned.

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