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    Stage Line 500W amp repair project

    On the schematic it shows all the resistors, there location and valves, could I make a note of them on paper, and test each one that way until I have tested them all, am having trouble working out the values from the chart, some of them are hard to see and I don't have a magnifying glass at...
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    Stage Line 500W amp repair project

    Ok so if I don't check them all now, could I damage the new components one fitted, or would I just have to check and replace later?
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    Stage Line 500W amp repair project

    yes Correct R31 (left) and R78 (right) are also 680Ω resistors, so measurements of 673Ω and 675Ω are fine. R30, R32, R62 (not R26) and R71 are 10Ω resistors, so measurements of 10.0Ω and 10.1Ω are fine too. sorry if am being dim but i am not sure i understand what you mean when you say...
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    Stage Line 500W amp repair project

    does that make any scence to you now kris
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    Stage Line 500W amp repair project

    tested Left chanel right chanel R2 673 R25 672 R31 673 R78 675 R30 10.0 R26 10.0 R32 10.0 R71 10.1 meter set at...
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    Stage Line 500W amp repair project

    when you say output stage do you mean R30 and R32 on the left chanel and R62 and R71 on the right, these are the main two between the driver transistors?
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    Stage Line 500W amp repair project

    Arrived today
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    Stage Line 500W amp repair project

    ok i have ordered these!! just got to wait for them to arrive to do any more, any resistors i may need i can get from MAPLIN electronics store near me , altho its much more expencive thanks for all your help and guidance kris youve been a star so far, i have a good idea of what i am doing...
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    Stage Line 500W amp repair project

    getting ready to order some parts now, does this look correct kris ? minus any resistors i may need?
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    Stage Line 500W amp repair project

    Thanks kris, will do that over the next couple of days and get back to you with my results.
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    Stage Line 500W amp repair project

    Hi kris, Ok tested all the driver transistors and all but one are good, Q26 reads 0000, As for the others you said not to bother testing so I havent!, And they the small glass type red diodes ? Marked on the board as D4--D6 and so on ?
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    Stage Line 500W amp repair project

    just noticed also fuses F5 and F6 have blown 0.1A 250V
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    Stage Line 500W amp repair project

    this is what colour should have went where, i had them reversed by mistake !! yes yes depending on cost, i dont mind replacing all four to be on the safe side numbers on the smaller transisters under the clips is D1763 F 952 and B1186 E 939 soorry i dont know how to use the quote function...
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    Stage Line 500W amp repair project

    Are these ok ?
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    Stage Line 500W amp repair project

    Will take some photos tonight Retested transistor no1 MJ15004 Meter stays at l as if not connected to anything for both base and emitter
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    Stage Line 500W amp repair project

    If I had to replace the 504, would these be correct ? http://www.digikey.co.uk/product-search/en?x=21&y=7&lang=en&site=uk&KeyWords=MJ15004
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    Stage Line 500W amp repair project

    Second transistor NPN MJ15003 with the red probe on the collector I get 0000 from base and emitter Third transistor PNP MJ15004 Black probe on the collector No reading from base No reading from emitter Transistor number 4 NPN MJ15003 Red probe on collector No reading from base No reading from...
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    Stage Line 500W amp repair project

    With the first mj15004, with the multi meter set at 2000k, Black probe on the case No reading from base, but emitter seems to slowly count down after a few seconds to around 1200 then slowly back up to 1270 ish
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    Stage Line 500W amp repair project

    Oh I see! Actually says on the transistor , sorry for being dim, the amp was in the garage when I asked the question, now it's in front of me it's obvious doh !!
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    Stage Line 500W amp repair project

    As bob was saying, I should have 2 of each NPN-PNP, is that correct? Just I will mark up which one came from where before removing the other three so as not to get them confused, also would I be right in thinking each Chanel has one of each ?
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