Technics SU-610, one channel down?

Question

Hi all,

Chatting to a mate the other day and in passing mentioned his old Technics SU-610 amp, seems to have lost one channel and might I be able to fix it (I've just fixed a car battery charger for him). ;-)

He said if he turns the balance fully to that channel and the volume fully up, he can just hear something from that speaker.

I've suggested he try some tests ... actioning all the switches, swapping the input leads over L/R, trying a different input, checking the speaker connections / swapping the speakers, trying the headphone socket etc and to let me know the outcome.

If it proves to be faulty and it comes to me, I've picked up one of those PC USB scopes (It was bought by my mate for his PC shop but mainly used by me there ... and he's not used it since he retired) and so I just need a signal source (any simple sine wave generator kits out there?), the schematic (got) and I'm good to go.

The schematic looks pretty simple (even for me ) but I'm guessing it's likely to be the main hybrid amp module, an SVI3102B and I see they are still available for not a lot of money (new / used).

Along with the basic tone generator question, does anyone know this model and is aware of any 'typical' fault causes / weaknesses / mods please?

Cheers, T i m

legg · Accepted Answer

switch/connector solder joints. RL

John-Del · Answer

I can't tell you how many of those came in over the years with cranky switches, either the rotating or sliding kind. Yes, by all means have him manipulate them or test those first if it shows up. If it responds, clean them accordingly.

The good news is that a stereo amp with one weird channel out of two identical channels is one of the easier things to troubleshoot in the consumer electronics world.

Edward Hernandez · Answer

Great reply JD.  No toxic or smart alec remarks.  Keep this up!  You just might win.

Fox's Mercantile · Answer

Piss off charger boy. --  "I am a river to my people." Jeff-1.0 WA6FWi http:

T i m · Answer

He was away till just earlier and said he tried using a different input and it worked, but didn't mention if he'd tried going back to the original ... (like I would have done).

For some people, as long as it's working they don't care about anything else. ;-(

Yeah, that would have been my next step, get some switch cleaner / Elecrolube in them. ;-)

Yeah, and this one looked pretty simple. ;-(

At least I've now got myself a simple PC scope:

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... and have found it's also supported under Linux:

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... and found a mod that upgrades it to be AC coupling:

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The only thing I haven't worked out is if the default is DC after the mod is applied as I don't think the factory software had the soft switch and the Windows version of OpenHantek doesn't work on W10 on the same PC when running Linux Mint (video errors, can't form the actual scope screen display).

Cheers, T i m

Edward Hernandez · Answer

Where is Pony pete?  He is better at this than you.  You're like a caveman who knows a little about electronics.  "41 Years!  I fix chargers!"  lol.

Edward H. · Answer

Why do you keep creating fake names?  It's pretty obvious.  You are using the same words repeatedly.  I told you you weren't as good as pony pete. Thanks for the effort you are making! hhahah!

Fox's Mercantile · Answer

You're delusional. I have never used a fake name. --  "I am a river to my people." Jeff-1.0 WA6FWi http:

Technics SU-610, one channel down?

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