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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Technics SU-610, one channel down?
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 g) 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 |
#2
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Technics SU-610, one channel down?
On Sat, 31 Oct 2020 13:51:04 +0000, T i m wrote:
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 g) 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 switch/connector solder joints. RL |
#3
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Technics SU-610, one channel down?
On Saturday, October 31, 2020 at 9:51:07 AM UTC-4, T i m wrote:
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 g) 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 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. |
#4
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Technics SU-610, one channel down?
On Saturday, October 31, 2020 at 12:44:09 PM UTC-5, John-Del wrote:
On Saturday, October 31, 2020 at 9:51:07 AM UTC-4, T i m wrote: 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 g) 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 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. Great reply JD. No toxic or smart alec remarks. Keep this up! You just might win. |
#5
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Technics SU-610, one channel down?
On 11/1/20 11:27 AM, Edward Hernandez wrote:
No toxic or smart alec remarks. **** off charger boy. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
#6
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Technics SU-610, one channel down?
On Sat, 31 Oct 2020 10:44:05 -0700 (PDT), John-Del
wrote: snip 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. 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. ;-( If it responds, clean them accordingly. Yeah, that would have been my next step, get some switch cleaner / Elecrolube in them. ;-) 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. Yeah, and this one looked pretty simple. ;-( At least I've now got myself a simple PC scope: https://www.hantek.eu/dso-6022be.html .... and have found it's also supported under Linux: https://github.com/OpenHantek/openhantek .... and found a mod that upgrades it to be AC coupling: https://github.com/OpenHantek/OpenHa...dification.pdf 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 |
#7
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Technics SU-610, one channel down?
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.
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#8
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Technics SU-610, one channel down?
On Sun, 1 Nov 2020 09:27:22 -0800 (PST) the anus of Edward Hernandez sputtered:
Great reply JD. No toxic or smart alec remarks. Keep this up! You just might win. Stop being such a troll and go away. You got useful advice at the outset on your charger in this group. Now you are simply acting like a spoiled child who was told "no candy before dinner" by Mom & Dad when you really wanted some candy. |
#9
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Technics SU-610, one channel down?
On Sunday, November 1, 2020 at 2:04:19 PM UTC-6, Fox's Mercantile wrote:
On 11/1/20 11:27 AM, Edward Hernandez wrote: No toxic or smart alec remarks. **** off charger boy. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com 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! |
#10
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Technics SU-610, one channel down?
On 11/2/20 9:19 AM, Edward H. wrote:
Why do you keep creating fake names? You're delusional. I have never used a fake name. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
#11
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Technics SU-610, one channel down?
On Monday, November 2, 2020 at 1:15:45 PM UTC-6, Enema man Fox Comics queeffed:
You're delusional. I have never used a fake name. Let's see what the comic man is up to. You're responding to my posts. Good work. Keep going. |
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