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Marantz SR5400 ...

Discussion in 'Electronic Repair' started by Arfa Daily, Mar 5, 2008.

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  1. Arfa Daily

    Arfa Daily Guest

    Anybody come across this one as a 'stock' fault ? Got one on the bench now
    that comes out of standby with the immediate message "CHECK DSP ROM". Bootup
    continues normally with protect relays dropping in ok, and unit settles with
    "DVD DIG.4-AT" in the display, and that's it. Unable then to select any
    other mode, or invoke any function either front panel or remote, except the
    front panel volume control, where the display correctly shows volume control
    action, before dropping back to DVD message again. Have tried a factory
    reset, which seemed to take place ok with the display saying "DEFAULT" and
    the amp carrying out a basic full restart, but symptoms remain.

    Anyone know this problem on this model, before I have to start diving in and
    ordering service manuals etc ?

  2. Franc Zabkar

    Franc Zabkar Guest

    I have no experience with this model, but its specs state that ...

    "Latest generation of DSP from Cirrus Logic decodes DTS ES, 96/24
    decoding, Dolby Digital EX, Dolby Pro-Logic II and Circle Surround

    I'd look for a CL chip and download its datasheet. If there is a
    separate ROM/Flash/EPROM chip in the vicinity of the DSP, then I
    suspect it is failing a checksum test on power-up. If the ROM is
    on-chip, then I expect you'll need to order the DSP from

    - Franc Zabkar
  3. Franc Zabkar

    Franc Zabkar Guest

    The specs state that the receiver supports "firmware update through
    RS-232C port". Is it possible that this error is the result of a
    botched upgrade?

    BTW the photo in this document shows "DVD DIG.5-AT" in the display:

    - Franc Zabkar
  4. Arfa Daily

    Arfa Daily Guest

    Hi Franc

    One of the others has fixed me up with some service info now, and the
    message in question is mentioned in the "errors" section as representing an
    issue with the DSP's code, as opposed to a comms problem between the DSP and
    the system control micro, which producs the slightly simpler message of
    "CHECK DSP". So yes, I agree with you. I think it's going to be a boot
    sequence checksum error. I'll start by having a look at the schematics to
    see if the DSP is internally coded, or has an external ROM glued to it. I
    suspect from the message, that it is going to be the latter. Hopefully, it
    will then prove to be something nice and simple like a crapped out lead-free
    joint or two on either the ROM or DSP.

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