How many 30N06s are in the amp?
Does the power supply have mixed FETs or are all of them 456s?
Were the FETs shorted originally or did they short after you repaired the traces?
The 60NF06 should be a good sub if the FETs have actually failed.
Does the power supply have mixed FETs or are all of them 456s?
Were the FETs shorted originally or did they short after you repaired the traces?
The 60NF06 should be a good sub if the FETs have actually failed.
Remove all of the FETs highlighted in the photo and check each one carefully. Do all of them read as shorted?
At all P30N06 drain i attach negative of ohm meter and at source the positive . The reading is 515 ohms.
At BUK456 drain i attach negative of ohm meter and at source the positive . The reading is 528 ohms
Any other attachment of the ohmmeter i did to all FETS doesn't read any shorted
If i replace the P30N06 with P60N06 will that be ok?
I am thinking of replacing all the FETS with new ones if you approve if it is worth it?
At BUK456 drain i attach negative of ohm meter and at source the positive . The reading is 528 ohms
Any other attachment of the ohmmeter i did to all FETS doesn't read any shorted
If i replace the P30N06 with P60N06 will that be ok?
I am thinking of replacing all the FETS with new ones if you approve if it is worth it?
I spoke friend that owns the amp. He told me something i didn't know. Accidentally a bottle of cologne felt inside the amp from his luggage!.😱
After that he told me that he left the amp at sun to drain.
the amp came in my hands with no marks of cologne.
Maybe this could damage the transformer or any other part ?
After that he told me that he left the amp at sun to drain.
the amp came in my hands with no marks of cologne.
Maybe this could damage the transformer or any other part ?
I doubt that the cologne would have caused any damage to the transformer. If any got into the amp, it would likely still smell like the cologne unless it's been a VERY long time since it spilled.
Re-check the FETs as is shown in the FET section of the basic transistor testing page (link in sig line below).
Re-check the FETs as is shown in the FET section of the basic transistor testing page (link in sig line below).
I have replaced all the FETS with new ones. The problem remains
By the way very nice articles you have very useful stuff
By the way very nice articles you have very useful stuff
To clarify, the problem at this point is that the amp draws the power supply down to 0v when you connect it. If this is not the problem, be very specific about the problem that you've currently having.
The problem that i have now after i have changed all the FETS with new ones is different
1.I power on the amp with everything soldered on pcb and i read 2.5A at +B and 10 Volts On +B and Ground. The FETS at one side (4xBUK465) starts heating very fast
2.I kept in mind your advice of desoldering the rectifiers with the new FETS onboard to understand whats going on with the power supply section i disoldered them of the pcb, powerd on the amp with reading of 2.5A at +B and 10 Volts On +B and Ground. The FETS at one side (4xBUK465) starts heating very fast
1.I power on the amp with everything soldered on pcb and i read 2.5A at +B and 10 Volts On +B and Ground. The FETS at one side (4xBUK465) starts heating very fast
2.I kept in mind your advice of desoldering the rectifiers with the new FETS onboard to understand whats going on with the power supply section i disoldered them of the pcb, powerd on the amp with reading of 2.5A at +B and 10 Volts On +B and Ground. The FETS at one side (4xBUK465) starts heating very fast
You need to remove and carefully check Q3e and Q4e. Disconnect the amp from power while these are out of the circuit.
The page that you went to earlier has instructions for checking this type of transistor.
The page that you went to earlier has instructions for checking this type of transistor.
Hello
I removed Q4E and Q5E. I could not locate Q3E.In picture you can see the transistors i removed
Q5E marks on it K905 and under that A1266. I am not sure if this link below is correct datasheet
KTA1266 datasheet(1/3 Pages) WEITRON | PNP Plastic-Encapsulate Transistor
Q4E marks on it K912 and under that A1266
I could not find the datasheets for this transistors to know if they are pnp or npn
Even if i searched them as 2sck 912
Best Regards
George
I removed Q4E and Q5E. I could not locate Q3E.In picture you can see the transistors i removed
Q5E marks on it K905 and under that A1266. I am not sure if this link below is correct datasheet
KTA1266 datasheet(1/3 Pages) WEITRON | PNP Plastic-Encapsulate Transistor
Q4E marks on it K912 and under that A1266
I could not find the datasheets for this transistors to know if they are pnp or npn
Even if i searched them as 2sck 912
Best Regards
George
Attachments
It's 4 and 5, not 3 and 4.
Use the testing page applet and post the screenshots for the filled forms for the two transistors.
Use the testing page applet and post the screenshots for the filled forms for the two transistors.
They shouldn't read the same on diode-check and ohms.
Q5E appears to be defective.'
The part numbers are KTA1266 or 2SA1266. The other numbers are likely production codes.
Q5E appears to be defective.'
The part numbers are KTA1266 or 2SA1266. The other numbers are likely production codes.
I use the multimeter at the 2000 ohms position and diode.
At 2000 ohm position i read the same with diode.
Hope that replacing the Q5 solves the problem. Tomorrow i will run and buy two new transistors and replace them. I will keep you informed
At 2000 ohm position i read the same with diode.
Hope that replacing the Q5 solves the problem. Tomorrow i will run and buy two new transistors and replace them. I will keep you informed
I've never seen a meter read like that. On resistance, the meter displays ohms. On diode-check, it displays voltage (for most meters, anyways).
Hello
This is the multimeter i use.
http://www5.picturepush.com/photo/a/11512713/img/11512713.jpg
I must purchase a new one better than this i think
This is the multimeter i use.
http://www5.picturepush.com/photo/a/11512713/img/11512713.jpg
I must purchase a new one better than this i think
Before buying a new meter, post links to the ones you're interested in so we can help you buy a good one. For now, you can use what you have.
I will post the link if i buy any. Thanks
About the amplifier now i changed the A1266 with new and amp doesn't power on again 🙁
When i connect power on amp it starts drawing slower than before amperes. In 5 second it draws about 3 A and voltage drops from 11,5 to 8 V in 5 seconds to. Also the one FET (P60NF06) is getting very hot in that time.
I checked the 100 ohm resistor that connects with one of it's leg and is ok
Any idea what else can i do ?
About the amplifier now i changed the A1266 with new and amp doesn't power on again 🙁
When i connect power on amp it starts drawing slower than before amperes. In 5 second it draws about 3 A and voltage drops from 11,5 to 8 V in 5 seconds to. Also the one FET (P60NF06) is getting very hot in that time.
I checked the 100 ohm resistor that connects with one of it's leg and is ok
Any idea what else can i do ?
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