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Old 21st August 2012, 07:14 PM   #1
dhbiker is offline dhbiker  Slovenia
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Default Technics SU V505 problems

hi there

i have a small problem with this amplifier... to be exact with relay that does muting/output selection.. it works fine when i put a bit pressure on it... on power on it usually clicks several times instead of just once

i tried to look in service manual but under part name says only SSY-107
google also doesn't find anything useful

so i'm asking if anyone knows the substitution for this relay ?

Click the image to open in full size.

thanks for your reply
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Old 21st August 2012, 07:53 PM   #2
Mooly is offline Mooly  United Kingdom
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Are you 100% sure it is the relay at fault and not the drive to the relay that is responding to the pressure... in other words a poor joint in the amp somewhere and the relay is doing its job of protecting the speakers.

You need to measure the voltage across the relay coil to be sure it is present and the relay NOT engaging.

If the relay is faulty then there should be suitable replacements available. They usually follow a standard pinout. Coil voltage and its resistance would have to be matched and the rating of the contacts at least as high as the original.
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Old 21st August 2012, 10:33 PM   #3
dhbiker is offline dhbiker  Slovenia
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will check it out and report.. but since now there hasn't been any problems that's why i think its the relay
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Old 22nd August 2012, 08:52 AM   #4
dhbiker is offline dhbiker  Slovenia
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hi there

i'm pretty sure it's the relay... everything seems fine.. no poor joints
voltage across coils is present

and the relay also reacts to slightest touch from side.. like poke it a bit it works normally... poke it again it doesnt work anymore
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Old 22nd August 2012, 08:58 AM   #5
Mooly is offline Mooly  United Kingdom
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From what you say that does point to the relay. If the voltage is present across the relay coil then it should work.

As to a replacement. You will have to determine if it is a standard pin out by comparing against other relays in the catalogues. It might help to see a picture of the underneath of it. If a pin compatible one can't be found then it's a simple matter to hard wire a different replacement in.

You need to measure the coil resistance (it says its a 24 volt coil on the relay) and choose one with similar or higher resistance. If it was much lower then it may not operate correctly or overload the relay driver transistor. Seeing the circuit of the relay driver would help in that case.
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Old 22nd August 2012, 09:48 AM   #6
dhbiker is offline dhbiker  Slovenia
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i'll take the bottom cover later today and take a pic.
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Old 27th August 2012, 08:16 AM   #7
dhbiker is offline dhbiker  Slovenia
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strangely it started to work properly .. probably because i was fiddling with muting/output selection circuit.. so this thread can be closed and deleted
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Old 27th August 2012, 10:49 AM   #8
Mooly is offline Mooly  United Kingdom
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But will it last

Its well worth going over all the joints on the PCB to resolder them, particularly any parts that run hot.
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Old 27th August 2012, 10:50 AM   #9
dhbiker is offline dhbiker  Slovenia
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it lasts now for 2 days

will resolder then tnx for reccomendations
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Old 29th August 2012, 07:15 AM   #10
dhbiker is offline dhbiker  Slovenia
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well you were right about lasting part... they are back

so this is what my relay looks like from the bottom Click the image to open in full size.

also i'm going to put it in another case that is more opened to monitor the problems right away...
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