ARCAM Alpha 5 PLUS CD PLAYER

Discussion in 'DIY Discussion' started by Keith7, Dec 11, 2012.

  1. Keith7

    Keith7

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    Analogue outputs suddenly went dead. Digital outputs are still fine. Fixable? The AMP is an analogue ARCAM Delta 290, hence a fix is needed.....:)
     
    Keith7, Dec 11, 2012
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  2. Keith7

    felix part-time Horta

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    Yes, almost certainly fixable.

    The digital output being live means *everything* up to the SAA7220A digital filter is working Fine. After that for the analogue outputs is the TDA1541A dac, and the analogue filter stage consisting of OP27 opamp doing I-V conversion and NE5532 in the output filter.

    First place to check would be to use a voltmeter to ensure all these chips are getting their required supplies. Measured w.r.t 0v (output jack 0v will do):

    TDA 1541A:
    +5v on pin 28
    -5v on pin 26
    -15v on pin 15


    Opamps should have +/-15v on pins 7 and 4 respectively.
    All voltages even within -/+1 v or more (!) of these nominal values will work fine - just take care not to inadvertently short pins with the probe when testing!

    If those rails are all in place it's probably time to look at the muting circuit, esp if it is sudden death on both channels (ie not one gone 'off'').

    I can email you a copy of the service manual if you drop me a PM with email addy...
     
    felix, Dec 11, 2012
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  3. Keith7

    Keith7

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    Hey thanks Felix,
    Appreciate your quick reply. Any cost associated with you sending me an e-opy of the service manual?
     
    Keith7, Dec 12, 2012
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  4. Keith7

    felix part-time Horta

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    No!


    Edit: Keith you have PM.
     
    Last edited by a moderator: Dec 15, 2012
    felix, Dec 12, 2012
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  5. Keith7

    Keith7

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    Thanks, Felix. That would be great if you could email a copy of the service manual. keith.kelder@gmail.com
    Much appreciated!
     
    Keith7, Dec 15, 2012
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  6. Keith7

    Keith7

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    Thanks, Felix. I got the link. Most appreciated!!!
     
    Keith7, Dec 15, 2012
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