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In Reply to: RE: Elekit TU-8200- won't play music posted by Bartguy on May 12, 2016 at 17:33:31
Please check the manual step by step.
Please check Page 6 step 6 (CB2)
Also all soldering points between PCBs ( UNit4 UNit 5)
Any question, email me your phone number..
Don't worry.. I will assist you to locate the issue..
Thanks for your help, Victor. I took the amp apart and reheated all the solder connections between units 4 & 5, paying special attention to all the CN connectors. I didn't see any glaring solder issues — maybe one light solder on the solders between the boards and just maybe a solder bridge between two of the close pins on the 40 pin connector which I desoldered and re-soldered. I made sure to really tighten down the M5 flange nuts on the speaker posts since it seems like that's a physical connection. I sent a picture of unit 4 with my solders.
When I turned it on again, I still have the LED and tubes lit, but no music. It sounded like for a moment I had an intermittent signal, kind of static-y, but then nothing. No music. I hear more transient pops now when I change the input, but that's about it.
Any other ideas are welcomed. Thanks. Mike 415-3057703
Hi Mike, Victor,
I have just received my Elekit and started to build it. Sure that soldering is not so obvious (I mean to do it well).
Don't know if it could be linked, but on this picture, it seems that Unit 5 and 6 are not soldered together on the 6 contacts #A to #F.
Pads A through F between Units 5 &6 were indeed unsoldered. Doh! I did the other right angle connections between boards which had a picture, but I missed the instructions to do it on these boards. My fault. The amp now plays music wonderfully.
Thanks for all the help, Victor and Vincent.
Thanks, Vincent. I'm away from home for the week, but the picture does look like I didn't solder those pads. Doh! That would certainly explain why the input isn't making it to the speakers. I'll check as soon as I get home.
It is soldering issue..
Don't worry.. I will help you to resolve the issue..
Hi Victor, I took the amp apart again and examined all the connector solders, especially CN4 and CN3 (pic of CN4 included). I don't see anything but shiny, good solders. I'll melt all the joints again and search for unsoldered joints on every board. Not sure what to do after that.
The only other thing I can see is that I really torqued down the speaker binding post nuts, which has compressed the insulating plastic washers. Could that 1/32" that they may be compressed be preventing CN3 and CN4 from mating tightly enough?
Did you check Unit 4/5? Page 5 step 3 - the solder points between unit 4 and 5
For CN2, did you solder this 8-pin socket
Yes, I did solder CN2. Here's the JPG.
Here's unit 4/5 joints
Here's a shot of CN3 in case that helps.
CAN YOU POST AN OVERVIEW OF UNIT 1?
CAN YOU POST AN OVERVIEW OF UNIT 1?
Here's Unit 1 B side.
I don't see any issue from Unit 1.
Please make sure the lead of each component is 0.5-1mm above the solder.
I think your issue is related to soldering.
You can ship your amp to me to check for you. You just take care both ways shipping..
I WILL GET BACK TO YOU LATER TONIGHT..
Here's Unit 1 A side
One random question: I've read that you can burn out an IC if you use too much heat. Is it possible that I accidentally burned out the IC and that's responsible for having no sound? (I don't think I kept the soldering iron on the IC for a long time or have any reason to believe that I damaged it, but I'm just searching for answers here.)
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