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Old 30th September 2007, 05:32 PM   #1
sc1984 is offline sc1984  United States
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Default ppi pc1400.2

I hope I am in the right forum. I have a ppi powerclass 1400.2 that fried. I am attempting to fix it. It is fried at the rca input. It only needs 3 0.1 ohm resistors and its fixed, but the bottom of the board is really vague. I cant quite see where the leads go to. I need to repair some areas. So my question is does anyone have any pics or the circuit board so I can figure everything out. Any help would be greatly appreciated
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Old 30th September 2007, 05:44 PM   #2
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Are you sure that they're 0.1 ohms? There are generally two 10 ohm resistors that connect the shield ground to the secondary center-tap ground. Those sometimes burn.
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Old 30th September 2007, 06:14 PM   #3
sc1984 is offline sc1984  United States
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the band is brown, black, silver, gold. which would be 0.1 ohms, right?
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Old 30th September 2007, 06:33 PM   #4
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If those are the colors on the resistors, you're correct.

I don't have any information on the 1400.2 (I have only limited information on the PC1400).

I have a pc275 that looks to be similar to the .2 series amps. If the attached image looks similar to your amp. I'll post a high resolution photo of the bottom of the board.

Do the resistors look like they have been changed?
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File Type: jpg img_3635b.jpg (80.6 KB, 91 views)
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Old 2nd October 2007, 03:21 AM   #5
sc1984 is offline sc1984  United States
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not quite the same, but similar. Any pics of the bottom would be greatly appreciated. Might have another problem. Used my roommates DMM and showed no continuity/resistance on half the transistors. I take it they all fried eventhough there is no visual evidence?
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Old 2nd October 2007, 04:21 AM   #6
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This image is 2800 pixels wide so your browser will likely try to resize it.

http://www.bcae1.com/temp/IMG_3634.JPG

Are you sure you're checking the transistors correctly?
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Old 2nd October 2007, 04:58 AM   #7
sc1984 is offline sc1984  United States
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...and no they didn't look like they were modified. they looked just like yours.....speaking of which do you know what kind of resistor that is...i.e ceramic, wire wound and the wattage rating?
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Old 2nd October 2007, 05:31 AM   #8
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From the size (0.6"/15mm long), they look like 3 watt resistors. I don't know what type of resistors the originals are. I'd use metal film or metal oxide film resistors. Whatever you choose, it should be flameproof.
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