[TechAssist] Re: Marantz SR-63U in protect
- From: "Dave" <audioserviceclinic@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 27 Feb 2003 11:12:26 -0800
It's best to check for DC Offset at the emitter resistors for each channel,
rather than at the output terminals. If you truly have no DC Offset and you
still believe you have a protection problem, there are usually a couple of
transistors past the outputs that are for protection. You can check them.
If it draws no current and has no offset, you can short the relay contacts
and check for proper operation. Past that, you will probably need the manual
to follow the protect line back to the processor, unless the board is
labeled.
Dave Kraus
Audio Service Clinic
Santa Clarita, California
----- Original Message -----
From: "Scott" <scott@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 27, 2003 8:59
Subject: [TechAssist] Marantz SR-63U in protect
>
> I am working on a Marantz SR-63U and the unit is in protect, ("PRE- ON"
> displayed on front panel, no speaker relay action) but has no DC on
outputs.
> Does anyone have a manual in PDF format or an idea on what to look for? I
> suspect a problem in the protect circuitry, but we don't normally work on
> Marantz, so I am a little stuck on it. Any help would be great. Thanx.
>
> Scott Beebe
> Ohm Electronics Inc.
> 609 W. Clinton St.
> Ithaca NY 14850
> Voice: (607) 273-8406
> Fax: (607) 273-8743
> www.ohmelectronicsinc.com
>
>
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