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Old 20th March 2017, 06:54 PM   #1
soma89 is offline soma89  Canada
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Default Just another "recapping headache" thread

Ok so i got a nice little working NIKKO TRM 210 AMP for my first recap job. The circuit is simple, as its a lil 12wpc unit.

Replaced all the caps. Thought everything was goin well. Powered it up and one cap was smoking!(2200mf 63v..C669 on schematic). Noticed that it was inserted the wrong way around (im an idiot, i know).

Anyways so i just got a new cap from digikey but now i get no sound at all!
Judging from the schematic, there are no reference voltages or fuses.
How would you recommend i start troubleshooting?
I have a multimeter, signal tracer, oscilloscope, signal gen.

Thanks!!

Last edited by soma89; 20th March 2017 at 10:24 PM.
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Old 20th March 2017, 07:01 PM   #2
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At first, try to measure any fuse in the device. The reversed cap may overload the rectifier, and perhaps tripped any protection system, including a thermal cutoff INSIDE the traffo itself.
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Old 20th March 2017, 08:22 PM   #3
tvi is offline tvi  Australia
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Does the power light come on?
The only fuse I can see is mains fuse on the rear panel

I assume you changed the cap i circled in the schematic... check the voltage at the arrow it should be about 1/2 of V+

Do you have a V+?? check at the centre junction of D691

hope this helps

regards
james
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Old 20th March 2017, 08:23 PM   #4
mbz is offline mbz  Australia
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I'm guessing C670, please correct me. You may have smoked the output TR's.
If C670 then check all power amp TR's in relevent channen(Q652,4, 654,6,8, 660,2).
I would expect this to take out one side only. Please share with us the cap number
Cxxx.
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Old 20th March 2017, 08:28 PM   #5
tvi is offline tvi  Australia
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Quote:
I would expect this to take out one side only. Please share with us the cap number
Yeah if its both channels that are dead and its not the fuse next might be the bridge rectifier?
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Old 20th March 2017, 09:32 PM   #6
soma89 is offline soma89  Canada
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Quote:
Originally Posted by tvi View Post
Does the power light come on?
The only fuse I can see is mains fuse on the rear panel

I assume you changed the cap i circled in the schematic... check the voltage at the arrow it should be about 1/2 of V+

Do you have a V+?? check at the centre junction of D691

hope this helps

regards
james
Yes, C 669 is culprit! Im getting 0v there. However i am not sure how to determine V+.
Can anything be determined by the mains fuse?
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Old 20th March 2017, 09:40 PM   #7
soma89 is offline soma89  Canada
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Powers up! No sound though
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Old 20th March 2017, 10:23 PM   #8
soma89 is offline soma89  Canada
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Quote:
Originally Posted by mbz View Post
I'm guessing C670, please correct me. You may have smoked the output TR's.
If C670 then check all power amp TR's in relevent channen(Q652,4, 654,6,8, 660,2).
I would expect this to take out one side only. Please share with us the cap number
Cxxx.
It is c 669 on schematic.
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Old 20th March 2017, 10:44 PM   #9
soma89 is offline soma89  Canada
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I dont see a fuse. Only these circuit breaker things with push buttons (not familiar with them at all)
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File Type: jpg 20170320_184032.jpg (861.5 KB, 98 views)
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Old 20th March 2017, 11:25 PM   #10
tvi is offline tvi  Australia
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See if you have continuity across the circuit breaker with the unit UNPLUGGED

Have marked the V+ on attached pcb pic
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