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Thread: Crown Macro Reference - looking for tech specs for transformer that powers backlight

  1. #1
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    Crown Macro Reference - looking for tech specs for transformer that powers backlight

    I originally posted over in the pro amp section but in retrospect, this is more accurately a consumer amp.
    I have a fine tech beating his way through a trial and error process trying to create a new transformer to power the front panel backlighting and I would sure like to help find some specs for him to work from.
    Would anyone happen to have any intel/gems that might be of use to him?
    Thanks folks
    Mark
    nb: The Crown service manuals apparently don't provide much info on this particular component

  2. #2
    Heather [Senorita member] hjames's Avatar
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    Apparently we are missing a chunk of the conversation -
    why can't you just get a replacement transformer from Crown?
    why would you have to re-engineer one/Create a new one for a backlighting circuit?

    No, I am not trying to be snarky at all, honestly, I'm just not getting the plan ...
    2ch: Oppo981, DDE3DAC, JoLida 502CRC, JBL L212, VonSchweikert VR4V
    7.1: Oppo BDP-103D, B&K, 2pr UREI 809A, TF600, JBL 4641

  3. #3
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    Thanks for asking and no offence taken :-)
    Crown no longer supplies parts for this amp of roughly 1992 vintage.
    Given the long history between Crwon and JBL, I was hoping someone here had experience restoring these amps.
    Cheers
    Mark

  4. #4
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    This the amp and the backlighting is apparently some sort of electroluminescent (EL in Crown speak) that my tech describes as being driven by a high speed switching transformer of unknown voltage.
    Here is unit
    Mark

  5. #5
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    Transformer

    The component seems to be a DC/DC converter. That is meant to be a "black box", you don't need to care about the internals. It contains some high speed switching circuitry with a tiny transformer (core plus some windings), but that is - see above - "black box", and it cannot be serviced (repaired).

    Try to determine the specs of that DC/DC converter, and get a spare for the whole converter, forget about the "transformer".

    The converter appears at the bottom of schematics page 2 of 3 (named EL Power Supply) and at the left of the pcb in service manual 8-2-22.

    Google for "DC/DC Converter" and have a look at the pictures. That should look familiar.

    Ruediger

  6. #6
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    Correction, Component is a DC/AC converter

    I was wrong when I thought the component was a DC/DC converter. It is a DC/AC converter.

    Manufacturers of EL foil supply the converter together with the foil, and you can buy the converters separately, for example "12 volt electroluminescent inverter for EL ..."

    Still it remains a black box, not serviceable.

    Ruediger

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