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Kenwood 6050 I am going crazy

simplyvolkol

simplyvolkol

New Member
So, I just found out that the transformer in this thing is outputting 70V instead of 34V and I do not know what would be the cause of this nor how this would happen. I do know that transformers output a but more than their ratings when not under load but I doubt that margin would be over 10V max. All the transformer connections look original and the only thing I have changed are the power transistors. Please help me or I am going to absolutely lose my mind. (And yes the amplifier is connected to 125 because it’s from America)
 
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Where/how are you measuring the voltage? If measuring Pins 27 and 28 you'll get about 68VAC. If measuring Pins 27 OR 28 AND 26 you should have 34VAC.

Craig
 
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As was asked above, exactly what points are you taking the measurements from?
 
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See post #2. A to C is across pins 27 & 28. That is the correct voltage on those pins.
 
kwayde said:
See post #2. A to C is across pins 27 & 28. That is the correct voltage on those pins.
Click to expand...
Ah, I have just measured pins 26 and 28 but now I’m seeing 15,6 volts. Also, measuring the voltage going into the power amp section, I see -70 instead of -46
 
Pins 26 to 28 should be half of the 70vac you showed in post #1. Pins 26 to 27 should also be half of the 70vac you measured in post #1. If you're getting -70vdc instead of -46vdc I'd check the rectifier to see if it's bad.
 
I would like to see the voltage measurements with the meter negative lead connected to Pins 26/29 on the X09-1350-10 power supply board. The DC voltage measurements from the ± connections of both of the 10,000µF main filter capacitors would be informative.
 
kwayde said:
Pins 26 to 28 should be half of the 70vac you showed in post #1. Pins 26 to 27 should also be half of the 70vac you measured in post #1. If you're getting -70vdc instead of -46vdc I'd check the rectifier to see if it's bad.
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I am getting 18Vac between pins 26 and 27/28
 
Watthour said:
I would like to see the voltage measurements with the meter negative lead connected to Pins 26/29 on the X09-1350-10 power supply board. The DC voltage measurements from the ± connections of both of the 10,000µF main filter capacitors would be informative.
Click to expand...
Will test when I’m back home
 
I also replaced the burnt put relay and it isn’t clicking in even after 1 minute of waiting suggesting either a faulty relay IC or low voltage (as I measured)
 
18VAC from Pin 26 to 27 and also from Pin 26 to 28 is too low. Is the unit connected through a dim bulb tester?

Is this a multi-voltage unit, with 100/120/220/240 input?
 
Watthour said:
18VAC from Pin 26 to 27 and also from Pin 26 to 28 is too low. Is the unit connected through a dim bulb tester?

Is this a multi-voltage unit, with 100/120/220/240 input?
Click to expand...
No it’s not connected to a dim bulb tester nor is it a multi voltage unit. It’s for 120 and it is connected to 125. Interestingly from pins 27 to 28 it is fine but not from pins 26 to 27/28
 
It would appear that the center tap (ground) connection at Pins 26 and 29 are suspicious.

KenwoodKR-6050IPowerSupply.jpg


The wires are wrapped on pins, and could have marginal connections.
 
in my case they aren't wrapped around the pins but directly soldered on, I guess the tech that has been here before thought it was a good idea to solder these wires on so it can't be a bad connection
Watthour said:
It would appear that the center tap (ground) connection at Pins 26 and 29 are suspicious.

KenwoodKR-6050IPowerSupply.jpg


The wires are wrapped on pins, and could have marginal connections.
Click to expand...
 
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