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Old 8th November 2009, 11:47 PM   #1
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Default Kenwood 9102

Im working on a kenwood 9102d i checked the outputs and 2 were bad i took them out . The problem is the amp wont power on its completly dead wondering what i should check at this point since all the power supply fets test good
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Old 9th November 2009, 12:21 AM   #2
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With the amp powered up, what's the voltage on the 3 pins of Q3?

Q3
Pin 1:
Pin 2:
Pin 3:
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Old 9th November 2009, 12:47 AM   #3
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Perry ,

Didnt see Q3 i saw Q403 is that what u mean ?? if so

Pin 1= 0
Pin 2- 5.97
pin 3= 5.97
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Old 9th November 2009, 12:59 AM   #4
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See attached.
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File Type: jpg q3-910201.jpg (209.3 KB, 62 views)
File Type: gif q3-910202.gif (11.0 KB, 56 views)
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Old 9th November 2009, 01:33 AM   #5
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Ok on Q3
Pin1= 13.90
Pin2= 4.72
Pin3= 13.30
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Old 9th November 2009, 01:40 AM   #6
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It's likely defective. If you have any TO-220 PNP transistor (2N6491, 2SAxxxx, 2SBxxxx...), you can use it to allow further testing. You'll have to install it facing the opposite direction because the pin configuration is reversed. The base goes to the nearest edge of the board.
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Old 9th November 2009, 02:08 AM   #7
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ok i replaced it with a 2n6491 and reversed it so now it reads

pin1=13.80

pin2= 8.18

pin3= 13.35


wondering what do i check neck since the amp is still dead i appericate the help perry without you id be lost
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Old 9th November 2009, 02:17 AM   #8
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The 13.35 is on leg 1 of the 6491 (ignoring the numbering of the other transistor), correct?

If so... is the 6491 getting hot?
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Old 9th November 2009, 02:23 AM   #9
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ignoring the pin order of the old transistor pin 1= 13.35

the 2n6491 is not getting hot at all amp has been powerd up for 10 mins
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Old 9th November 2009, 02:38 AM   #10
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What's the DC voltage on the 3 pins of Q2 (SMD under board - see attached for pin numbers)?

What's the DC voltage measured directly across R6?
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