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Thread: Inspiration Classic head rewiring

  1. #1
    RBW Member risototh is an unknown quantity at this point risototh's Avatar
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    Angry Inspiration Classic head rewiring

    Hi all,

    i bought an Inspo Classic some time ago and after i have seen the actual state of the SMB connectors to sensors i decided to replace them. I bought new SMBs at Farnell, done the old ones and... Uf, that was not a cable anymore, that was a nightmare. Totally black, not solderable anymore...
    So i looked here to get some informations about what's in the black junction box. I found some mentions about that, but the guy who offered some photos has not responded... Never mind, i'm working (and designing) microelectronics, so what worst can happen, that i can see now

    I took it apart, piece by piece with small knife and other tools. I write down all the colors, striped all the cables and then, i desoldered the wires. It was tuff and ugly, i don't know what they used to solder it... So i designed new board and waited a week/two to get them. When it was appart, i disassembled also the rest of the heads (all fittings, solenoid) and cleared them in the ultrasonic bath with the citric acid and some degreaser. All is now shiny like a new :D

    Only problem was to get some good coax cable (tined) for the SMBs. I looked at Farnell, but what i have to do with 100 meters? I placed the request to our slovak local electronics engineers forum and one guy posted me old cable from CRT monitor. It's really good and tined cable. I tested it for about a month in wet, salt, little acid conditions and it's still in perfect condition :D Thank you!

    Also when it was apart, i installed sensor cable for the Petrel inside the black box as i made new PCB with the proper holes for that

    I decided to take some photos, only to show it here (the internet will archive that forever :D) and maybe it will help someone else.

    P.S. when it was soldered together, i put the two lines interconnecting the handsets on the scope, only to see, what they choosed for a bus... Uf, I2C... What i have seen was an engineering nightmare. So many crosstalks (between SCL -> SDA, buzzer and both I2C lines), I2C generated by software (the timing has changed in the time)... Take a look at the screenshots... An the "almost soldered" wire from one of the sensors... I don't like the YBOD abbreviation, but now i know...

    Cheers,
    Richard
    Attached Images

  2. #2
    RBW Member risototh is an unknown quantity at this point risototh's Avatar
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    Re: Inspiration Classic head rewiring

    P.S. if someone want the gerber files (or eagle) of the PCB, drop a line via PM

  3. #3
    Duvet Diver Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A's Avatar
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    Re: Inspiration Classic head rewiring

    Richard,
    did you put in isolation resistors for the Predator cable? If not a flooded fisched connector or split in the cable can make the cells lie to all the electronics.

    Simon A

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    RBW Member risototh is an unknown quantity at this point risototh's Avatar
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    Re: Inspiration Classic head rewiring

    Quote Originally Posted by Simon A  View Original Post
    Richard,
    did you put in isolation resistors for the Predator cable? If not a flooded fisched connector or split in the cable can make the cells lie to all the electronics.

    Simon A
    What sort of resistors? I don't know the input impedance of the petrel, so what value is usually used as a series resistor? In other hands, i'm not a cave/deep diver (yet... but maybe in the future), so damage to the cable/connector is very unlikely.
    But thanks for the notice, i will do a revision of the breakout board and put there some 0603 resistors.

  5. #5
    RBW Member Sandrok is an unknown quantity at this point Sandrok's Avatar
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    Re: Inspiration Classic head rewiring

    Impressive! Really nice job! This is the first time I see photos of someone doing a rewire of a classic... Thanks for sharing!

  6. #6
    Roland Somodi rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver is a glorious beacon of light rolanddiver's Avatar
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    Re: Inspiration Classic head rewiring

    10Kohm will do the job. the input resistance of SW is 100K

    VR

    Roland

  7. #7
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    Re: Inspiration Classic head rewiring

    Quote Originally Posted by risototh  View Original Post
    What sort of resistors? I don't know the input impedance of the petrel, so what value is usually used as a series resistor? In other hands, i'm not a cave/deep diver (yet... but maybe in the future), so damage to the cable/connector is very unlikely.
    But thanks for the notice, i will do a revision of the breakout board and put there some 0603 resistors.
    As Roland says, the impedence of a Petrel/Predator/Pursuit is approx 100Kohms or greater. A 10Kohm resistor between each cell +ve and the +ve lines to the shearwater will give you isolation of the shearwater cable (10Kohm may not be the "ideal" figure, but it's known to work)
    Alternatively Narked@90 will sell you a shearwater cable with the isolation resistors potted into the cable at the M12 cable gland, and you can simply replace the shearwater cable you have.
    HTH
    Simon A

  8. #8
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    Re: Inspiration Classic head rewiring

    Quote Originally Posted by risototh  View Original Post
    Hi all,



    P.S. when it was soldered together, i put the two lines interconnecting the handsets on the scope, only to see, what they choosed for a bus... Uf, I2C... What i have seen was an engineering nightmare. So many crosstalks (between SCL -> SDA, buzzer and both I2C lines), I2C generated by software (the timing has changed in the time)... Take a look at the screenshots... An the "almost soldered" wire from one of the sensors... I don't like the YBOD abbreviation, but now i know...

    Cheers,
    Richard
    So.........are you saying the electronics are a POS? Also is this a potentially dangerous situation?
    Later,
    John

  9. #9
    RBW Member turtle dude is an unknown quantity at this point turtle dude's Avatar
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    Re: Inspiration Classic head rewiring

    Super star!
    Don't supose you want to do the same with the hand sets,?.
    Regard
    Baz.

  10. #10
    RBW Member Marco Fonti is an unknown quantity at this point Marco Fonti's Avatar
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    Re: Inspiration Classic head rewiring

    Hi Risototh, you can see the Inspo software? This is interesting. I have a Inspo too, and my handsets are gonna die...
    Send the head to AP for service will be too expensive. Maybe I can do something by myself? The only alternative is to convert it in a mccr, which is not a bad thing, but if Ican save the "e" will be better.

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