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16th November 2011, 01:53 AM
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#11 |
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diyAudio Member
Join Date: Jan 2010
Location: memphis tn
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i got the amp to power up and play for one channel. i was looking for these parts but they are not stocked or i have to buy in bulk. the transistors are in the output driver section of the amp.. 2SC2631-2sC2235
Last edited by timwebb; 16th November 2011 at 02:01 AM. |
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16th November 2011, 02:16 AM
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#12 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The following is supposed to be a cross for the 2235. It may be a suitable replacement for both.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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16th November 2011, 02:31 AM
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#14 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The pin configuration is wrong. Legs 2 and 3 must be swapped. Make sure that the legs aren't touching.
This should be OK for testing to determine if the amp has other problems. The original transistor (2236) is a 1w transistor so the A42 may overheat and fail prematurely.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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18th November 2011, 02:22 AM
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#15 |
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diyAudio Member
Join Date: Jan 2010
Location: memphis tn
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i got the original part. now i have the amp back together and it plays fine for about fine minutes. then it stops playing. the amp stays on but the relays clicks. the bias has been moved from the previous repair. this is the back of the board. for the bias.
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18th November 2011, 04:01 AM
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#16 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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If you look at the waveform on the output transistor (leg 3), do you have a clean signal there after the relay clicks?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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