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Old 19th November 2012, 04:43 AM   #11
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The 1156 may work if you can find them.
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Old 19th November 2012, 04:48 AM   #12
timwebb is offline timwebb  United States
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also the junction is kinda of high on the a1837 and c4793.
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Old 19th November 2012, 04:59 AM   #13
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You have to compare the transistors with the same part numbers. If one reads off from all of the others, it may be defective. If all are high, it's likely normal.
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Old 19th November 2012, 05:11 PM   #14
timwebb is offline timwebb  United States
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ok i thought i could find the 2sa1156 but no luck. any other sub?
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Old 19th November 2012, 06:19 PM   #15
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Which one failed (Q???)?
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Old 19th November 2012, 07:44 PM   #16
timwebb is offline timwebb  United States
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q43 has a low ohm reading from the rest the part is kta1277
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Old 19th November 2012, 08:52 PM   #17
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I think the KSA1220A will work in that location but I'm not 100% sure. I have one that I need to repair that I could try it in but it won't be finished until the end of the week. If you don't have the 1220A, you could use an MPSW92 for testing but you'd have to swap the 2nd and 3rd legs (being careful not to let them short).
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Old 19th November 2012, 10:22 PM   #18
timwebb is offline timwebb  United States
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i have to order some. i can wait.
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Old 20th November 2012, 02:24 AM   #19
timwebb is offline timwebb  United States
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ok im getting 13.4 pos and neg from the regulators. when i dont have the driver card in i have about 14.8v on the pos and neg regulators. could that be my problem also the regulators are 15v.
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Old 20th November 2012, 05:54 AM   #20
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Measure the DC voltage on the regulators with the black probe on the negative speaker terminal or with the black probe on the ground terminal of the regulator on which you're measuring the voltage.
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