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Denon AVS486 Diodes

 
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glen65



Joined: 08 Jun 2008
Posts: 1

PostPosted: Sun Jun 08, 2008 6:24 pm    Post subject: Denon AVS486 Diodes Reply with quote

Hello,
I’m currently working with a Denon AVR-486
receiver. I have already found out what’s ailing
it, but I’m having trouble identifying two shorted
surface mount diodes which are connected in series with
each other in the output section of the unit. The
outputs being used are Sanken 2SB1560 and 2SD2390
and a 2SD947F in between as a driver.

The schematic designation numbers of the diodes are
D101 and ZD102 (zener diode) below is a pic of
of the two diodes. The zener is marked 82 and
the other diode T4.


I’ve already looked at different things that supposedly
decode the markings but the results were so much
all over the map they were no help with identifying them.
The manual wasnt listed on this site.
I just wanted to see if anyone has the service data
on this unit to find out what exactly I’m going to
need for replacements.

Thanks
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun Jun 08, 2008 10:40 pm    Post subject: Reply with quote

http://clivetec.superihost.com/SMD_Codes.htm

It would be easier if you had the service manual to get the part # but follow the above link and you should be able to figure it out.
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Mon Jun 09, 2008 6:57 am    Post subject: Reply with quote

Do not have the exact schematic but it rings a bell. willing to bet it is the same asanine design that denon came up with. Had one heck of a time getting them originally
Basically they are tying a zener to a small signal at each output... why? for xtra protection if/when there is an output failure (DC) DUH of course they are sure to blow everytime...mind you there is already speaker protection! If you simply leave them off, it will be just fine.. sheesh
You can tell I've never been a fan of Denon.... anyways on the AVR380 & some others the zener was HZS6A1 & the small sig, 1SS270A.
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