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Help! With troubleshooting SMPS for a Denon reciver. (Low output voltage)

Discussion in 'Troubleshooting and Repair' started by 23komma4, Mar 16, 2019.

  1. 23komma4

    23komma4

    1
    0
    Mar 16, 2019
    Hi,

    I'm trying to fix a power supply for a denon reciver, AVRX2100W, but now I'm stuck.

    At first, the AC/DC converter (MAG258MG) had blown, so I replace that along with some diode's, see attached picture.

    When measuring the output voltage I get 1V, and it should be 5.2V.

    Any ideas on what could be the cause on the voltage drop? Thanks!
     

    Attached Files:

  2. Bluejets

    Bluejets

    3,486
    706
    Oct 5, 2014
    Denon are REALLY complex pieces of equipment.
     
  3. Martaine2005

    Martaine2005

    2,394
    630
    May 12, 2015
    @Ferdi57 said to check the zener diodes.
    He built a zener diode controller to speed up smps repairs.
    (Google translate).

    Martin
     
  4. KilgoreCemetery

    KilgoreCemetery

    231
    9
    Apr 12, 2017
    I'm no expert when it comes to this sort of stuff (read noob), but from what I understand, the optocoupler is supposed to regulate the amount of voltage that the SMPS puts out. If it's reading wrong it could throttle the output. Something like a bad zener mentioned above could certainly cause it
     
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