Marantz SR5400 ...

Mar 05, 2008 3 Replies
A

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 ?



Arfa


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On Wed, 05 Mar 2008 14:15:01 GMT, "Arfa Daily" put finger to keyboard and composed:

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

6.1"

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 Marantz/Philips.

- Franc Zabkar

Please remove one 'i' from my address when replying by email.
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On Wed, 05 Mar 2008 14:15:01 GMT, "Arfa Daily" put finger to keyboard and composed:

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:

formatting link

- Franc Zabkar

Please remove one 'i' from my address when replying by email.
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A

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.

Arfa

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