sansui won't click

clippking · 3rd August 2010, 02:16 AM

Hope someone can help. I picked up a Sansui AU 7700 amp at a garage sale. Awsome deal, amp, Sansui tuner and kenwood tape deck for $5. Set it up and it worked fine. Next time I went to use it nothing. Amp light comes on has outlets on the back have power, but no click. Came back a few days later turn it on amp clicks and is fine. Today gone again. 6 amp fuse looks fine. Where do I go next?

Sorry if this is a common question, I am new and amateur, but I really like the amp and hope I can fix it. It also sounded great when it was working.

Thanks for any suggestions

lanchile · 3rd August 2010, 04:25 AM

it can be many things...check for bad caps or relays. without troubleshooting it is not easy.

bob91343 · 3rd August 2010, 05:37 AM

Measure the output voltage of each amplifier to see how close to zero volts it is. Check the service manual and adjust if necessary. Watch to see how stable it is; if it drifts too far, the protection circuitry will disconnect the speakers.

Mooly · 3rd August 2010, 06:51 AM

Might be nothing more than dry joints somewhere... disconnect the speakers and gently tap and apply pressure around the PCB's with a plastic tool and see if the relay clicks in and out.
Favourites are any components that run hot, resistors, transistors etc. Just look carefully at all the soldering and tap around.

Tony · 3rd August 2010, 09:24 AM

most likely output offset in one channel....

DigitalJunkie · 3rd August 2010, 09:25 AM

I had a 5500? with a similar issue.It would randomly disconnect,or not click when power was turned on.After some more investigation,I discovered the bias and offset wouldn't sit still because of leaky electrolytic caps.New caps fixed it right up,and new trimpots didn't hurt either. After that it was rock-steady.

Tony · 3rd August 2010, 10:07 AM

yes, re-capping won't be a bad idea.....

sakis · 3rd August 2010, 12:52 PM

recaping at this age is a simple fact .... you need to replace all ...and all means all ...

some more info regrading the procedure can be found here vintage amplifier repair/upgrade manual

3rd August 2010, 02:16 AM	#1
clippking diyAudio Member Join Date: Aug 2010	sansui won't click Hope someone can help. I picked up a Sansui AU 7700 amp at a garage sale. Awsome deal, amp, Sansui tuner and kenwood tape deck for $5. Set it up and it worked fine. Next time I went to use it nothing. Amp light comes on has outlets on the back have power, but no click. Came back a few days later turn it on amp clicks and is fine. Today gone again. 6 amp fuse looks fine. Where do I go next? Sorry if this is a common question, I am new and amateur, but I really like the amp and hope I can fix it. It also sounded great when it was working. Thanks for any suggestions

3rd August 2010, 06:51 AM	#4
Mooly diyAudio Member Join Date: Sep 2007	Might be nothing more than dry joints somewhere... disconnect the speakers and gently tap and apply pressure around the PCB's with a plastic tool and see if the relay clicks in and out. Favourites are any components that run hot, resistors, transistors etc. Just look carefully at all the soldering and tap around. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

3rd August 2010, 09:24 AM	#5
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	most likely output offset in one channel.... __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

3rd August 2010, 10:07 AM	#7
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	yes, re-capping won't be a bad idea..... __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

3rd August 2010, 12:52 PM	#8
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	recaping at this age is a simple fact .... you need to replace all ...and all means all ... some more info regrading the procedure can be found here vintage amplifier repair/upgrade manual __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

3rd August 2010, 04:25 AM	#2
lanchile diyAudio Member Join Date: Sep 2008	it can be many things...check for bad caps or relays. without troubleshooting it is not easy.

3rd August 2010, 05:37 AM	#3
bob91343 diyAudio Member Join Date: Mar 2010	Measure the output voltage of each amplifier to see how close to zero volts it is. Check the service manual and adjust if necessary. Watch to see how stable it is; if it drifts too far, the protection circuitry will disconnect the speakers.

3rd August 2010, 09:25 AM	#6
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	I had a 5500? with a similar issue.It would randomly disconnect,or not click when power was turned on.After some more investigation,I discovered the bias and offset wouldn't sit still because of leaky electrolytic caps.New caps fixed it right up,and new trimpots didn't hurt either. After that it was rock-steady.

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