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Hertz hp1d full rebuild
Hertz hp1d full rebuild
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Old 4th December 2019, 06:41 PM   #1
Lenin89 is offline Lenin89  Bulgaria
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Default Hertz hp1d full rebuild

Full rebuild.

I've already removed all the FETS in the PS section and the Output section.
All dead.
Output driver board for the class D is still in place as I have to fix the PS section first.

I've checked the gate drive in the PS just before the gate resistors (as this ones also have to be replaced).

I don't think this is normal. Two of the banks driving one of the transformers look shifted upwards. The other one looks normal. Pictures attached. So I think i will have to rebuild also the PS board - i think it is the buffer driver transistors.
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File Type: jpg other side.jpg (235.8 KB, 134 views)
File Type: jpg one side.jpg (224.9 KB, 134 views)
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Old 4th December 2019, 08:22 PM   #2
Lenin89 is offline Lenin89  Bulgaria
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Kaboom...

I have to look up somewhere for schematics to rebuild this. I was extremely careful while removing the SMD transistor but still....
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File Type: jpg 1.jpg (583.6 KB, 124 views)
File Type: jpg 2.jpg (615.9 KB, 118 views)
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Old 4th December 2019, 09:15 PM   #3
Lenin89 is offline Lenin89  Bulgaria
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Okay, this is some generic KA7500 board design but i think it's pretty much almost the same as mine.

As i can't read the markings on the burnt transistors, logical thinking brings me to the conclusion that they were marked as BE RN = BCX55**, a 1Amp NPN transistor in SOT-89 ?
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File Type: jpg ka7500.jpg (81.0 KB, 131 views)
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Old 4th December 2019, 09:47 PM   #4
ultra is offline ultra
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Can you take a photo of the underside of the board close to the speaker connector ?
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Old 4th December 2019, 09:48 PM   #5
Lenin89 is offline Lenin89  Bulgaria
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Yes I can, no problem - but it's going to be tomorrow.
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Old 4th December 2019, 10:08 PM   #6
Perry Babin is offline Perry Babin  United States
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2SB1260 and 2SD1898?
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Old 5th December 2019, 08:04 AM   #7
Lenin89 is offline Lenin89  Bulgaria
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As much as I could see the markings these transistors are BE RN and DK RG which I believe are: BCX55-16 and BCX52-16 and these I can order from Farnell.

2SB1260 and 2SD1898 are impossible to find in my region.
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Old 5th December 2019, 12:29 PM   #8
Perry Babin is offline Perry Babin  United States
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Look at the connections for the transistors. The PNP transistors will have their collectors directly connected to ground. Use whatever you can get but make sure you have the NPN and PNP in the correct locations.
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Old 5th December 2019, 09:58 PM   #9
ultra is offline ultra
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Quote:
Originally Posted by Lenin89 View Post
Yes I can, no problem - but it's going to be tomorrow.
Will you take the photo ?
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Old 6th December 2019, 06:35 AM   #10
Lenin89 is offline Lenin89  Bulgaria
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Yes of course, but i'm still driving home. I promise when I come back to my place I will.
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