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Old 10th August 2009, 04:10 AM   #11
Dimon74 is offline Dimon74  United States
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Join Date: Feb 2008
Hi to all.I didn't have experience to work on PDX-1.100 ,but I repaired three of PDX-1.600 What I see from your schematic.In those amps only differnce in amount of power suplly fets and also different drivers for them.PDX-600 uses only 8 fets in power suplly ,yours uses 12 of them.These amps are very good quality built and also they are easy to repair ,if follow step by step.This PDX amp based on the same schematic as MRP-M1000.They did only one thing in this newest models,changed power suplly fets which was IRF3205 to newest directFETs also from IRF.I repaired like 15 ALPINE MRP-M1000 amps.These amps are simpliest I ever had.
If you 100% sure your power suplly section is working fine.You should go only to output stage .Make sure ,you have neccesary voltage to suplly drivers (IR2010S) To measure voltage on KTD718 ,you have to put negative probe on negative rail which is -Vss and positive to emmiter of KTD718.This regulator is referenced to -Vss not to the ground.In my experience when some mosfets in output stage failed.It will get one shorted MURS120 ( replacable with ES2D) If MURS shorted ,100% IR2010S is dead too.And most important thing ,you will find three paralleled resistors of 6,8 Ohm will open too.If you replaced all those parts(IR2010S,MURS120,Three resistors 6,8 Ohm) and also shorted output fets(IRFB4227) on the beginig of your work on this amp.It will work again as new one.But I'm sure you did a mess inside,and now it isn't easey to find the problem.Sorry
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Old 10th August 2009, 01:26 PM   #12
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Join Date: Aug 2009
Thank you Dimon74. That is exactly the info I needed. I did a quick check of the MURS120 diode while on the PCB, and it shows shorted. I will pull it to night to verify, but I think you may have just found my problem.
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Old 11th August 2009, 12:31 AM   #13
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The MURS120 at D304 is shorted, also found the opposite MURS at D303 to be open, and the C321 cap to be low.
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Old 30th September 2009, 03:27 AM   #14
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Replaced the above and am getting loud tone emitting from sub. Tone sounds like it is around a 150-200hz sine. Any ideas?
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Old 3rd October 2009, 02:01 AM   #15
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Never mind, just found out that Alpine has a $70 flat rate repair.
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