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Old 17th December 2012, 08:04 AM   #1
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Default Hifonics Zues XI

I received this amp for repair.

The amp powers up and seems stable and produces audio......however upon opening it there were only 2 p/s fets installed.

I get a square wave on all the gate resistor pads but some have big squares and some have small squares.

I am going to put new p/s fets in and see what happens.

I noticed a spot on the board that is brown from heat behind the pwm board from a component in location QP7 and is marked B631K and there is a resistor inline with it that burned in position RP18. I am not sure of the resistance it should be because I cant identify it.

Anyone have one of these lying around that could help me?
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Old 17th December 2012, 06:22 PM   #2
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Are RP17 and RP18 serving the same purpose in two identical circuits?

Check the drive signal before installing the power supply FETs.
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Old 17th December 2012, 07:55 PM   #3
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I have checked the gate drive signal, some of the pads have a nice large square wave, and some of the pads have a nice small square wave. Why is there different sizes in waves between gate pads?

Those 2 resistors appear to be similair circuits but are different color and I believe different values.
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Old 17th December 2012, 08:10 PM   #4
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How do you define large and small? Pulse width? Square wave?

If the difference is amplitude, what is the amplitude of the large and small?
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Old 17th December 2012, 08:52 PM   #5
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I will have to check when I get home, leaving for work.

Check your e-mail Perry.
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Old 25th December 2012, 07:31 PM   #6
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Replaced the burnt resistor and the 2SB631K and the supply has a nice square wave. I installed 4 out of the 10 p/s fets and the amp powers up and is stable. As soon as I get the parts for this amp and the BXi2610D I should have them both up and running.
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Old 30th December 2012, 09:31 AM   #7
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I installed the remaining 6 p/s fets and I now no longer have a square wave.

The amp powers up and is not in protect. There is a hissing noise from somehwere in the power supply. I viewed the drive circuit through the scope while powering the amp and it starts to go square then loses it.

Anything I am missing?
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Old 30th December 2012, 09:44 AM   #8
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Do you still have a square wave on the output pins of the driver IC for the power supply?
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Old 3rd January 2013, 04:16 AM   #9
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This PWM board uses a KIA494AF controller.

According to the datasheet I looked up it says pin #13 is the output controller, and ouput #1 is pin #8 and output #2 is pin #11.

Is this correct?

So I need to view the signal on pins 8 and 11?

The pin configuration is all mixed up on the data sheet an unlike a TL494C is this also correct?
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Old 3rd January 2013, 04:53 AM   #10
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Pins 8, 9, 10 and 11 are all terminals of the internal NPN driver transistors. Most amps use 9 and 10 as the outputs but MTX and a few others use pins 8 and 11.

This amp uses pins 9 and 10 as the output pins.
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