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Old 23rd August 2005, 07:36 AM   #1
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Angry ppi pc21400 resistors burned out

hi everyone first time here, i have a ppi pc21400 amp, got it from a friend, it stopped working when he had it, he took it apart and there were 2 resistors? burned up, had all the circuits tested and resistors removed by his father (a electrical enginier) and everything else is ok, they couldnt find any part numbers for the resistors so they left it alone and i ended up with it. to cut to the chase i took it apart, by the coding on the board they are r2 and r3, right by the rca inputs, im wondering if anyone can tell me what exactly they were and where i can get them or a diagram for the amp. i apretiate any help thanks
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Old 23rd August 2005, 02:33 PM   #2
Eva is offline Eva  Spain
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Could you draw a partial schematic of what's around these resistors and what's connected to them? I know it's a though task that requires a lot of patience, but with that schematic we could easily figure out the purpose of these resistors and a suitable value for them.

The more complete the schematic, the more easy it would be to figure out. Trust me, I've already had to resort to reverse-engineering several times in order to figure out the value and type of unrecognisable resistors and transistors.
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Old 23rd August 2005, 07:18 PM   #3
TO-3 is offline TO-3  Peru
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Default Re: ppi pc21400 resistors burned out

Quote:
Originally posted by focuspower1320
hi everyone first time here, i have a ppi pc21400 amp, got it from a friend, it stopped working when he had it, he took it apart and there were 2 resistors? burned up, had all the circuits tested and resistors removed by his father (a electrical enginier) and everything else is ok, they couldnt find any part numbers for the resistors so they left it alone and i ended up with it. to cut to the chase i took it apart, by the coding on the board they are r2 and r3, right by the rca inputs, im wondering if anyone can tell me what exactly they were and where i can get them or a diagram for the amp. i apretiate any help thanks

The two resistors next to the RCA jacks are 10 ohm / 3W resistors. They couple the RCA ground to the signal ground. They usually go bad if the power supply ground is missing and the amp grounds itself through the RCAs.
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