Marantz Service Manual error thread

Discussion in 'Marantz Audio' started by Jailtime, Jun 16, 2011.

  1. Uncle Bambi

    Uncle Bambi Funky Tut Subscriber

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    San Ramon, CA
    RE: the 2220B......

    Just finished an overhaul, and found something interesting on the power amplifier board. At the top of the board there are two green blob diodes at positions H705 and H706. They are on the schematic as such, so no issues there. What isn't on the schematic but was physically found on my unit was an additional pair of green blob diodes, one going from the positive side of H705 to R709, and one going from the positive side of H706 to R710. On both ends, these undocumented diodes share PCB holes with the devices that they bridge. See pic for example:

    upload_2017-12-26_11-58-54.png
     
    Last edited: Dec 30, 2017

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