Kaption DZ-300.1 help - diyAudio
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Old 23rd March 2013, 07:27 PM   #1
Jamie85 is offline Jamie85  Canada
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Default Kaption DZ-300.1 help

I found different resistances on the output fets even know they are the same so I took them out and checked them and they seem to be ok I think. I get OL on every configuration except from pin 3-2 at 0.48v. So I put them back in and powered up the amp. It didn't go into protect so I tried playing it and there was no sound. I then took the two power fets out and checked them and I'm suspecting leaky gates but I'm not sure. When I check in diode mode everything seems fine but when I check in resistance from pin 3-2 one goes to 13.7m ohms and started to climb slowly 0.01m ohm at a time and the other one started around 14m ohms and climbed slowly too by 0.01m ohm. Then I checked again and one read 13.68m ohms and the other goes to 14.05m ohms and stayed there. Then I checked again and they both were over 14m ohms and they slowly started to climb 0.01m ohm at a time to around 14.35m ohms.

These seem like weird readings but I'm not familiar with leaky fets. They are DFP50N06 fets.

Thank you in advance

Last edited by Jamie85; 23rd March 2013 at 07:40 PM.
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Old 23rd March 2013, 08:45 PM   #2
Jamie85 is offline Jamie85  Canada
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I just powered up the amp to check voltages at the Fet legs, her is what I got.

Power fets are the same:

Pin 1: 4.45v
Pin 2: 12.25v
Pin 3: 0.00v

Output fets are labeled the same:

Pin 1: -0.165v
Pin 2: 41.5v
Pin 3: -0.18v

Pin 1: -41.4v
Pin 2: -0.18v
Pin 3: -41.5v

Do these readings seem ok?

I checked the speaker terminals and they have -.163v in positive terminals and -0.003 v in negative terminals. The rca's have a little voltage on the inside and outside.

I appreciate any help you could give me.
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Old 24th March 2013, 03:59 AM   #3
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Post a photo of the inside of the amp.

The power supply appears to be OK but the outputs don't appear to be driven.
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Old 24th March 2013, 06:44 PM   #4
Jamie85 is offline Jamie85  Canada
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Here are the pics. Hopefully they are ok.
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File Type: jpg photo2.jpg (756.6 KB, 27 views)
File Type: jpg photo3.jpg (816.2 KB, 27 views)
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Old 25th March 2013, 01:45 AM   #5
Jamie85 is offline Jamie85  Canada
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The circuit board is a little browned between the green r135 and r136 resistors and the c9 capacitor. Near the middle of the amp. Nothing looks burned though. I tested the resistors and they're ok.
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Old 25th March 2013, 02:47 AM   #6
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Post another photo showing the area including R63 and R72 and the driver IC?

It's common for regulator resistors to damage the board. If the Zener diodes connected to them aren't shorted, it's likely not a problem.
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Old 25th March 2013, 03:22 AM   #7
Jamie85 is offline Jamie85  Canada
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Here is the pic, I'll start checking what I can in that area. I checked the Zener diodes and I can get resistance measurements in both directions, do I have to take them out of the board to check them properly? Is it worth checking into or do you think the problem is something else? Thanks for your help.
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Last edited by Jamie85; 25th March 2013 at 03:37 AM.
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Old 25th March 2013, 03:47 AM   #8
Jamie85 is offline Jamie85  Canada
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Here is a pic from the other side
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Old 25th March 2013, 03:55 AM   #9
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Is D56 shorted? It looks like it's cracked.

If it's not defective, post the DC voltage on all pins of the IRS2092. Look up the datasheet if you don't know the pin numbering scheme.
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Old 25th March 2013, 04:32 AM   #10
Jamie85 is offline Jamie85  Canada
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I think there was something on D56 that made it appear weird looking during the picture. it seems ok and after testing I don't think it's shorted.

Here are the voltages of the IRS2092.

Pin 1: 4.94v
Pin 2: -0.003v
Pin 3: -0.164v
Pin 4: 4.62v
Pin 5: 2.418v
Pin 6: -4.95v
Pin 7: -36.4v
Pin 8: -38.36v
Pin 9: -30.99v
Pin 10: -41.4v
Pin 11: -41.4v
Pin 12: -26.67v
Pin 13: -0.182v
Pin 14: -0.167v
Pin 15: -0.138v
Pin 16: -0.178v

Last edited by Jamie85; 25th March 2013 at 04:56 AM.
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