The whole XI series were plagued by the shorted toroid issue. I have seen about a dozen myself over the last year or so.
Does yours have a API symbol on the endplate ? API only made amps for Hifonics for a short time as I recall before Maxxsonics took over. I think this issue was why that happened...Good luck on fixing the windings,....🙂
Does yours have a API symbol on the endplate ? API only made amps for Hifonics for a short time as I recall before Maxxsonics took over. I think this issue was why that happened...Good luck on fixing the windings,....🙂
I like to shoot a few gobs of goop under them to secure, so they can't move. Is there an issue of heat buildup/etc gluing on them? I try not to cover much surface area.
You should apply the minimum adhesive possible. If you shoot large amounts of adhesive under the transformer, it's going to make it nearly impossible to remove if you need to do so later.
If you need to secure a large inductor/transformer, use small supports on the perimeter of the core 90° from the terminals. If needed, you can apply a small amount of adhesive to the point where the terminal windings touch the rest of the windings. This will provide good support and won't interfere with cooling.
If you need to secure a large inductor/transformer, use small supports on the perimeter of the core 90° from the terminals. If needed, you can apply a small amount of adhesive to the point where the terminal windings touch the rest of the windings. This will provide good support and won't interfere with cooling.
I must have gotten that from you, I put it under the sides where they move/rock not where the wires to board are. Just enough to reach board to coil, and one spot not a line of it. Some amps have it already, I really don't like the idea of not having something if they move easily. I see a smaller MTX here that has it on a tiny board mounted, then drops that whole setup into the amp. But that transformer is small enough it might not ever move around itself anyway.
Ok im back to working on this again.. I fixed the power supply section in the amp, Now im working on the output section but i ran into a problem never seen it before now put there is a board location of QP14 either a bd911 or a bd912 goes there anyone know which one belongs there any help would greatly be appericated
ok here we go again. i put in new outputs,and power supply transistors amp powers up without poping the caps anymore.
now the problem is the amp is in protect mode wondering what do i check at this point
now the problem is the amp is in protect mode wondering what do i check at this point
Do you have any DC offset on either channel?
Is pin 16 on the 494 going high (higher than pin 15)?
If you don't have any DC offset and pin 16 is going high, post the DC voltage on all of the pins of the LM358.
IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Is pin 16 on the 494 going high (higher than pin 15)?
If you don't have any DC offset and pin 16 is going high, post the DC voltage on all of the pins of the LM358.
IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Didnt see any lm358 but there is a 9523g and the reading are
Pin1: 0
Pin2: 9.88
Pin3: 2.86
Pin4: 0
Pin5: 12.28
Pin6: 4.93
Pin7:12.36
Pin8: 13.79
Pin1: 0
Pin2: 9.88
Pin3: 2.86
Pin4: 0
Pin5: 12.28
Pin6: 4.93
Pin7:12.36
Pin8: 13.79
The 9523 is likely a date code.
If pin 7 of this op-amp is driving pin 16 high, you need to trace back pin 5 to see if you can determine what's driving it high.
If you're careful (transistors clamped, current limiter in the B+ line...), you can defeat the protection to see if the amp powers up normally and produces audio on both channels. To defeat the protection, you can either remove the IC or break the connection to pin 5 and short it to ground. Don't short it to ground while it's connected to the board. If you do, you may damage the component driving it high.
If pin 7 of this op-amp is driving pin 16 high, you need to trace back pin 5 to see if you can determine what's driving it high.
If you're careful (transistors clamped, current limiter in the B+ line...), you can defeat the protection to see if the amp powers up normally and produces audio on both channels. To defeat the protection, you can either remove the IC or break the connection to pin 5 and short it to ground. Don't short it to ground while it's connected to the board. If you do, you may damage the component driving it high.
im back to working on this amp again. when powerd up the ampo goes into protection. I removed the outputs and powerd it up and the amp doesnbt go into protection.
So with the outputs in its in protection with no outputs in amp is fine. The bd911 and 912 heats up also almost to the point where u canttouch them wondering if anyone klnows why this is
So with the outputs in its in protection with no outputs in amp is fine. The bd911 and 912 heats up also almost to the point where u canttouch them wondering if anyone klnows why this is
do u mean the bd911 and 912 if so they are after the output stage if not what transistors are u refering to
Are you sure they're not driver transistors?
Do they get hot in both channels?
Do they get hot with the outputs out of the circuit?
Do they get hot in both channels?
Do they get hot with the outputs out of the circuit?
i think they only get hot with the outputs out of circuit with the outputs in circuit they are fine. so guess i anwserd that question. But wondering with the outputs in curcuit the amp goes into protection wondering why this is
Reinstall the outputs in one channel. Does it go into protect?
If not, pull them out of that channel and reinstall the outputs in the other channel. Does it go into protect?
If you find that one channel is causing it to shut down, that's the channel we need to concentrate on.
If not, pull them out of that channel and reinstall the outputs in the other channel. Does it go into protect?
If you find that one channel is causing it to shut down, that's the channel we need to concentrate on.
Ok the problem is in the left channel. i did some testing and came across a transistor marked a916 and it tests bad wondering if anyone knows where i can get this part from or a good replacement thanks
Should be this: http://www.mcmelectronics.com/product/2SA916 check the datasheet.
Just google '2sa916'
Just google '2sa916'
ok i checked this amp out sommore. put the outputs in left channel also a driver from the right channel still goes into protection. So i guess ill do somemore checking into this and let you know
ok think i figured it out a diode went bad on the left channel also.
The markings on the diode read ifk bav 01 wondering if anyone knows what part number this diode is or what i can put in its place the voltage across the other diode for the right channel reads 12.00 volts
The markings on the diode read ifk bav 01 wondering if anyone knows what part number this diode is or what i can put in its place the voltage across the other diode for the right channel reads 12.00 volts
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