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    Stage Line 500W amp repair project

    Removed and it reads dead short emitter to bass and bass to emitter, also reads the same emitter to collector and collector to emitter, so guess its shot , now the original one is mpsA42 E02, i cant seem to find replacements with the E02 part, is this important?
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    Stage Line 500W amp repair project

    So, i thought D9 was dead as it read the same either way round on the diode check setting, pulled it out and it reads fine, (replaced anyway), next tested Q1 from emitter to collector, it reads the same with the probes either way round, The corresponding transistor on the right channel seems to...
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    Stage Line 500W amp repair project

    So would say the power supply to the board is good ?
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    Stage Line 500W amp repair project

    Mesuring from the OVPL T20, negative probe, i get 64vDC at each fuse 2- 2+, fuse locations F1, F2, F3, and F4
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    Stage Line 500W amp repair project

    Ok, how do i do this ?
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    Stage Line 500W amp repair project

    I can take some reading if you like, there is a schematic for this amp in post #9, Cheers
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    Stage Line 500W amp repair project

    Ah i see, as a kind of protection circuit, so the bulb takes the load and keeps the componants safe ?
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    Stage Line 500W amp repair project

    Also have you read the full post, Cheers Pete
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    Stage Line 500W amp repair project

    Is thos a suggestion for the load, ie speakers pete
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    Stage Line 500W amp repair project

    So, quick probe around today, would appear D9 zenner 1N4004 is shot so giving me a dead short causing the fuse to blow, gonna have to order some spares
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    Stage Line 500W amp repair project

    Yes all the outputs are new and never been installed, i realise this is a long post, in short it blew up and i was repairing it qith the help of the guys on here, due to sercumstanses it qas chucked on the back burner for about 3 years, now i have changed a shed load of parts and took many...
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    Stage Line 500W amp repair project

    Realised today after cleaning and re soldrring i disnt have the positive lead connected to the left channel, thats why it seemed to be ok ,when it is connected it blows T17 fuse so it seams there is a dead short somewhere on that side
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    Stage Line 500W amp repair project

    So now all cleaned up and back together, some re soldering done, and fot the first time one of the fuse resistors has blown and lit up, T17, and fault left light is back on, i think i have fixed the bad solder joints and recreated the original fault , at least its an indication where to look next,
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    Stage Line 500W amp repair project

    Much better, also replaced R62 and R71 to match the left side
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    Stage Line 500W amp repair project

    Bit of clean up work today, heatsink was still filthy, also Q12 was a bit loose, on closer inspection half the tracks on the board were partly missing or came away, here is my fix, if there is a better way to do this please let me know, it was a pain
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    6KVA UPS Inverter is not charging the batteries

    Sad that as my new job is UPS engineer hahahh
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    6KVA UPS Inverter is not charging the batteries

    Never give up hahah
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    6KVA UPS Inverter is not charging the batteries

    https://www.electronicspoint.com/forums/threads/stage-line-500w-amp-repair-project.270979/
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    6KVA UPS Inverter is not charging the batteries

    Sjame, i left for 3 years but came back lol
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    Stage Line 500W amp repair project

    Also i have a new project after this, very similar but hopefully wont take so long to complete
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