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22nd September 2010, 07:15 PM
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#1 |
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diyAudio Member
Join Date: Sep 2006
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PPI A1200
I recieved this amp in for repair.
Someone has worked on this amp before and well put NTE parts in it for the outputs. So thet have to be switched back to the orginals. The parts circled in blue is the NTE part the emitter resistors dont look right either . They should all be 0.33 ohms correct? Also the 2 large resistors with the blue arrow pointing to them are they the right resistors or not? They are marked 3.9K 10% Also Q75,Q74 Q77 Q76 appear to have been messed with also heres whats in thoose locations now Wondering if they are the correct parts Q75:MTP3055V Q74:IRF9540 Q77:MTP3055V Q76:IRF9540 Any help would greatly be appericated. Last edited by mike49504; 22nd September 2010 at 07:18 PM. |
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22nd September 2010, 07:29 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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0.33 is right for the emitter resistors.
Q74: 2SA1303 Q75: 2SA1011 Q76: 2SC3244 Q77: 2SC3284 There are two 3.9k resistors (one is R13) near the regulators.
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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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22nd September 2010, 08:01 PM
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#3 |
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diyAudio Member
Join Date: Sep 2006
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Thanks Perry,
I will replace thoose parts and look through the rest of the amp also. The power supply fets have been replaced at 1 time also . The fets that are in the amp right now are :P60N06's with 22 ohm gate resistors . Are theese the right fets for this amp? |
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22nd September 2010, 08:05 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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I don't know what the original FETs are but those should be OK. The 22 ohm resistors are right.
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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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22nd September 2010, 08:15 PM
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#5 |
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diyAudio Member
Join Date: Sep 2006
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Ok cool Thanks
There is more stuff that has been replaced with nte parts Wondering if you know what goes in the following locations. Q13 Q14 R15 R17 Since theese all have been replaced R15 and R17 have 33 ohm resistors in thoose locations right now. |
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22nd September 2010, 08:28 PM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Q13: 2N6490
Q14: 2N6487 I can't find the resistors. Where are they?
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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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22nd September 2010, 08:41 PM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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If they're under the bussbar, they appear to be 3.6k ohms but I can barely see them. See attached.
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22nd September 2010, 09:44 PM
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#9 |
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diyAudio Member
Join Date: Sep 2006
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The resistors are directly in front of the ones in the pic .
Also is the amp suppose to have a busbar like in the pic?? There are 2 locations in this amp marked GND by the outputs that appear that something has been soldered there before but not now If you need more pics let me know |
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22nd September 2010, 09:54 PM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The amps appear to be slightly different. Yours appears to use traces on the board in place of the bussbars.
The resistors that you are referring to are marked Q10 and Q16 in this amp. They are 33 ohms.
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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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