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  1. I've built an audio signal tracer and can follow...

    I've built an audio signal tracer and can follow a healthy signal from pin2 hot at xlr input jack all the way to pin 7 u15b 4560 and lose signal at one side of r135 also can anyone tell me...
  2. Hi John I'm missing the surface mount layout as...

    Hi John I'm missing the surface mount layout as in this pic so have no component numbers on smc side of board, is this complete for the rcf312a ? If you have any more info could you possibly post...
  3. here's schematics I retested my voltages were...

    here's schematics I retested my voltages were correct still same phew!.
  4. Hi I'll double check and repost voltages as i ran...

    Hi I'll double check and repost voltages as i ran amp with limiter both on and off and may have tested voltages with it on, sorry!

    When The protect light was connected it lit a few...
  5. Hi the protect light is not on the tweeter or...

    Hi the protect light is not on the tweeter or horn works but not the main 12 inch speaker I can't post schematics off my tablet doesn't seem to be an option I'll put them up,tomorrow though from my...
  6. Thanks for reply john I check that cap,it seems...

    Thanks for reply john I check that cap,it seems fine but I'll replace it while I'm on would you know if my rail voltages are correct I posted my readings they seem stable and similar values - and...
  7. Help! Trying to repair an RCF312a woofer is off

    Hi im from the u.k. england i bought this rcf 312a mk1 think! And would love to try to repair it, it did have lim protect light on and the fuse marked for +high voltage connected to mos3 had blown....
  8. Help! Trying to repair an RCF312a woofer is off

    Hi all i bought this rcf 312a mk1 think! And would love to try to repair it, it did have lim protect light on and the fuse marked for +high voltage connected to mos3 had blown.

    I opened...
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    Ok thanks for reply and info so how would you...

    Ok thanks for reply and info so how would you recommend I test a j113 I remember I removed it (and the bss139) from pcb they appeared shorted whereas the rest tested ok in circuit I don't mind...
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    No, i used current lamp for first power up when I...

    No, i used current lamp for first power up when I reassembled it.. I did forget at one point when I noticed the powered monitor / amp was now working and i upped the volume it cut out! i thought well...
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    ****Just an update I seem to have fixed my amp! I...

    ****Just an update I seem to have fixed my amp! I plugged in a current limiter bulb and it showed no or little current draw a bright light only for split second on power up boxed it all back up...
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    Behringer B215a blown help needed.

    Hi all just after a little help, i've been given a blown up Behringer B215a powered monitor for free! so decided to try and resurrect it so far i have found and replaced the following damaged parts...
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    thanks all for the replies sorry i'm a bit late...

    thanks all for the replies sorry i'm a bit late getting back to you guys i've just revalved this amp again and have the same problem its really annoying as fault usually doesnt occur until a couple...
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    just bumping my thread

    just bumping my thread
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    Marshall tsl602 bias drifting

    Hi all great forum i hope someone might be able to help me? :) my tsl602 bias drifts really badly i usually set bias to 80mv recheck an hour or so later and it varies from as low as 60mv or upto over...
  16. Thread: diode help

    by basher106
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    thanks for prompt reply guys, gals! one more...

    thanks for prompt reply guys, gals! one more thing i also ordered some other
    diodes the original values in power amp board that's fried are,
    1N5245 15v 500mw 1/2 WATT zeners they arrived from...
  17. Thread: diode help

    by basher106
    Replies
    5
    Views
    1,794

    diode help

    Hi all, I have a power amp i'm trying to repair and one part i needed was
    a 1000mw 1N4728 zener diode d0-41 glass orange color type transparent so i ordered one up
    and the one i recieved is...
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