Question about Denon AVR 2808Ci Receiver

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I connected, mistakenly , my denon 2808ci to a 240 volts power outlet i opend the top lid of he receiver and checked everything . liek fuses etc. everything i sok. but the switches not powerin up and system is dead. i got a burning smell for few seconds but now gone. please let me know where to check and hwat might have gone bad. thanks

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  • 3 more comments 
  • sudarshanarao
    sudarshanarao Oct 11, 2013

    hi i researched further, here are the points i could make out.kindly help diagnose the issue.

  • sudarshanarao
    sudarshanarao Oct 11, 2013

    1) the power connections from th e power board( first inlet board) are tested when the two wires that go to transformer are taken out, positive and negative are showing correctly, that is tester is glowing at only one fo the two nodes. but when i connect the wies( ble socket) then both ends are gloing. i guess this is short ciruit in the tranformer?

  • sudarshanarao
    sudarshanarao Oct 11, 2013

    1) the power connections from th e power board( first inlet board) are tested when the two wires that go to transformer are taken out, positive and negative are showing correctly, that is tester is glowing at only one fo the two nodes. but when i connect the wies( ble socket) then both ends are gloing. i guess this is short ciruit in the tranformer?

  • sudarshanarao
    sudarshanarao Oct 11, 2013

    2) when the power switch on the receiver is pressed in, the circuit at the power switch end shows no lights glowing in the tester. but when it is switched off( prssed out) it is not showing any lights in the tester.Is this siwtch board/switch gone?

  • sudarshanarao
    sudarshanarao Oct 12, 2013

    more clarification: There is a board to where the main power inlet is connected. out of which there are two outlets. BLUE and RED plastic power plugs, each with one negative an done positive poles. th BLUE one goes to POWER SWITCH at the front and the RED one is going to transformer( from which the voltage is being reduced to different level and will be sent to different circuit boards) Now when i PRESS the POWER SWITCH "IN", and put the tester at the firts node of blue plug, it Glows. Now i put the tester at the second node of the same Plug, it is not glowing. and then i put the tester at the other end of theBLUE PLUG wires( at the switch)NOTHING GLOWS. and now I PRESS TEH SWITCH "OUT" ( usually this should be OFF position), the Nodes at the switch BOTH are Glowing. and also the Nodes (both) at the other end( near the circuit board ) are glowing. I think this is a short circuit? if its short circuit it should give a blown out sounds and sparkseverytime i connect it to power right? but it is not. teh SYTEM is DEAD silent, no light glowing , neither any display nor any smell now. I knwo its an OLD 2008 receiver. but it never gave me any problem what so ever an di feel really bad to bring it to this stage due to my negligence. I shouldnt have connected it to a 220 Volts supply when itjust needs 110 volts. BUT again iam really surprised that DENON didnt have this basic protection mechanism of blowing out fuses it the voltage goes to more than 110 volts etc. Now coming to the point of fuses. I checked physically every Fuse . I could see two ear main power cirsuite board, 4 below this board and 2+2 on th eother boards. I see no fuse on the font display panel circuit. I only opened th etop lifd an di see only these fuses. I didnt check them elctrically, but physical examination showed all fuses intact. KINDLY HELP. Thank you

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  • 163 Answers

First you need to check standby power supply- i think the small transformer is gone as well as some surrounding components.

Posted on Oct 16, 2013

Testimonial: "Thanks for the reply paul...the vertical circuit board is obtaining power from main power socket, then one set of wires from it goto switch and another set of wires goto big transformer. i guess proble is here only. how can small transformers o wrong when current is not yet into them? pardon my ignorance but i am not very knowledgeable in circuits. thanks"

  • 2 more comments 
  • sudarshanarao
    sudarshanarao Oct 26, 2013

    Paul, Today i took it to a repairer( Denon people refuse to do a repair as they say costs will be expensive and tis a waste of time to repair it. They advised me to throw it and buy a new one. Well i dont own a Denon to do that kind of thing...so i took it to a local experience person. HE checked an dfound exactly what you said...he confirmed main transformer was working. and that the snadby or control circuit( small transformer) might be gone. H edoesnt have a circuit diagram to check( he is a old timer and so not conversant with iinternet etc) . Could you please let me know where i can download a service manual to get the snandby/control circuit diagram of denon 2808 Ci? THANK YOU SOMUCH

  • sudarshanarao
    sudarshanarao Oct 27, 2013

    thanks Purchased it from SR manuals. Need to check how am i goign to get parts if any part is to be replaced. I just saw int he manual that there mentioned a reset sequence. is this going to help if i press the buttons as mentioned? or if the power circuit is gone, this is nto goign to help? the two clicks that come after the set is on are nto there....

  • EBC ELECTRONICS Oct 29, 2013

    if the standby transformer is dead you can not reset the unit. You need to restore standby circuit- check power transformer for continuity, check standby power supply diodes and regulators. there should be ac after power transformer and dc after bridge diodes. there is also small electronics fuse wich usually get bad and you can temporary short it. what do yo mean when you say that the meter glows? you need multimeter to repair this not an electritian tester. thanks.

  • sudarshanarao
    sudarshanarao Nov 09, 2013

    Thanks Paul, The technician noticed that the standby power transformer is gone. I ordered one from DENON USA. It will be shipped o a local address ( friend) and he will be shipping it to me. Will let you know once this is fixed. thank you somuch for the kind help.

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