+ Reply to Thread
Results 1 to 13 of 13

Thread: Hercules 2 circuit diagram

  1. #1
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default Hercules 2 circuit diagram

    Hi,

    so I unplugged my deck to do some dusting, plugged it back in and it's gone bang, cooked a resistor off the switch input (which is odd).

    Anyway it's dead now but I can't see anything obviously poorly so will need a diagram ideally to see what's what (and identify the value of that dead resistor) if anyone has a copy that would be ace.

    Thanks

  2. #2
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    I found a photo so was able to read the resistor colours. \o/

    One of the switching transistors has blown, will fix and get rid I think, don't like the design as they get very hot, unsurprising I think that switching it off and on again caused it to pop.

    Need to source a Lingo I think.

  3. #3

    Default

    have you asked Stamford(I think they are the importers)if it's normal to run hot? there may be another issue that can be fixed causing this,I know the Valhalla boards do run hot and as the herc is based on that design so it may be inherent but also may not be

  4. #4
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    Yeah they're supposed to run hot, too hot to touch hot. Swapped out the dead transistor and resistor but it's still dead so probably a logic fault.

    Will get there.

  5. #5

    Default

    linn supply or used to supply a service kit for the Valhalla,as the herc is based on it it may be an idea to find out which components that kit replaced and see if they are common to the herc as they were components that were affected by the heat/age on the Valhalla board,there is a guy in Sheffield who services the Valhalla,he may do the Hercules as well?

  6. #6
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    You could replace every component on the board for about 30 so I'm not overly worried that it's not repairable. Diagram makes it easier.

  7. #7
    Join Date
    May 2007
    Location
    scotland, , United Kingdom
    Posts
    5,828
    Blog Entries
    1
    Rep Power
    351399

    Default

    have u tried running it at 45rpm instead of 33rpm?
    I've seen one of these that the speed control crystal had gone faulty and board appears dead...i replaced the crystal that stamford supplied and was fine

    does you board have a label with a serial number on it?
    www.audioorigami.co.uk

    And visit my face book page--- check out Audio Origami

    http://www.facebook.com/AudioOrigamiTonearms

  8. #8
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    There's no power to the switch, doesn't light up.

    No serial number on it. I bought it 2nd hand and it needed caps and transistors then as it was horribly cooked.

    I'll figure it out, had to spend the weekend painting bedroom doors so not had chance for further investigation.

  9. #9
    Join Date
    May 2007
    Location
    scotland, , United Kingdom
    Posts
    5,828
    Blog Entries
    1
    Rep Power
    351399

    Default

    sounds like it may be a import from hong kong job rather than a stamford unit

    the wee chips on board can cost a few squid each and I've found from experience that you can remove the chips and fit with insertable pin base fittings...this makes swapping a chip easy for fault finding
    www.audioorigami.co.uk

    And visit my face book page--- check out Audio Origami

    http://www.facebook.com/AudioOrigamiTonearms

  10. #10
    Join Date
    Nov 2016
    Location
    Sweden
    Posts
    169
    Rep Power
    0

    Default

    It is a import from Edmund on Mober that Stamford Audio has.
    Drop a mail on chanedmund7@netvigator.com and se what you get back.

    /L
    NO ONE : Tangerine Audio Stiletto, Plateau, Skorpion, SME V ( D ), DV DRT XV 1S, Chord Sign Tuned Aray, Cirkus, Radikal Klimax, Tranquility.
    NO LINN : Woodsong, PEEK, SSP 12, AI bobbin https://www.linnarts.se

  11. #11
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    Update

    Fixed it. It really let go. So it killed one of the switching transistors and one of the chips, this had sent a decent amount of power through the switch which also killed that and took out the ribbon cable in the MOSE that connects the Hercules to the interface board in the Mose. Kinda dodgy it was able to do that.

    I think the reason it blew was due to the motor; that connects to a little board that sits inside the deck which has some shite terminal connectors on, these had broken meaning the motor had an intermittent connection on the neutral and just the phase power connected. I've probably been a bit keen tightening the screws when I swapped the motor out So removed those connectors and installed some new ones. Sourced the other bits through Stamford and we're all up n running again.


    Anyway as I couldn't find a diagram and didn't have a logic tester I just replaced all the transistors and all the chips, cost me a whopping 8, have a job-lot of spares too as I had to buy them in batches of 5.

    All the chips are in sockets now so if it decides to eat itself ever again then it'll be quicker to fix.

    Whilst it caused a bit of hassle thankfully it was a cheap fix and there's nothing weird or hard to find on the Herc 2.

    Had this die, my lawnmower died, one of the monitors in my studio blew its amplifier and the screen on my arcade machine has gone on the blink. The god of electronics is sending me a message!

  12. #12
    Join Date
    Mar 2015
    Location
    Leeds
    Posts
    532
    Rep Power
    0

    Default

    used the old motor from my Dad's deck to set up this repaired Hercules 2.

    I may have over done it with the new LED

    I had a bunch of nice caps lying about from another project that were the right values so swapped them out.

    This had had all new caps, new logic IC's, and new switching transistors, it's essentially a refurbished unit now.







    If anyone is interested in a Herc 2 for their TT let me know, will eBay it otherwise.

  13. #13
    Join Date
    May 2007
    Location
    scotland, , United Kingdom
    Posts
    5,828
    Blog Entries
    1
    Rep Power
    351399

    Default

    nice job qube !!
    www.audioorigami.co.uk

    And visit my face book page--- check out Audio Origami

    http://www.facebook.com/AudioOrigamiTonearms

+ Reply to Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts