2235B Pop on switch off

Discussion in 'Marantz Audio' started by VintageMad89, Mar 14, 2017.

  1. VintageMad89

    VintageMad89 Active Member

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    Thanks, H812 tested fine. The PS board has been recapped also. It would seem so, not sure if I should shell out on a new relay or not...
    Yeah, I agree. Just going through process of elimination at the moment! :smoke:

    I can see it on the schematic also... I think it could be hidden above the switch as I can't see anything from below. Looks like the face plate will be coming off :idea:
     
  2. bryans12v

    bryans12v Marantz Junkie Subscriber

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    If the relay is opening and closing properly I would just inspect the contacts and clean/polish as necessary. They are generally referred to a maintenance parts but for the sake of troubleshooting I would just pop the cover off and inspect.
     
  3. VintageMad89

    VintageMad89 Active Member

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    A bit more testing today folks!

    As for the relay, I have taken it apart and cleaned/burnished the contacts- no change.
    I have searched everywhere for a suppressor cap on the power switch and near the AC inlet and obvious areas- there appears to be none.:dunno:

    Lastly, I tried switching the unit off at the wall (with power switch on) and the pop is not present... :idea:

    Any thoughts?
     
  4. petehall347

    petehall347 the brandy coffee man Subscriber

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    switch arcing because snubber cap is missing
     
  5. bryans12v

    bryans12v Marantz Junkie Subscriber

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    Follow the wire coming into the unit, through the unswitched outlet and to the power switch and from the switch to the transformer primary. It should be evident if there is one installed and it will be before the fuse.

    If not one present, install one. There should also be evidence of someone in there previously if it had been removed.

    Make sure you use a proper safety cap rated for mains voltage such as the link below and any 1/4 watt 100-120ohm resistor soldered to either leg in series configuration.

    http://www.mouser.com/ProductDetail...EpiMZZMv1cc3ydrPrF%2bfZ13WJ/r1/T8VQe%2buyZl8=
     
  6. VintageMad89

    VintageMad89 Active Member

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    Is there a reason it would be missing? The unit hasn't been messed with until I recapped it- would this be something the factory missed?
     
  7. VintageMad89

    VintageMad89 Active Member

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    Thanks, I feel like I have been over every inch of it trying to find one :rflmao:

    I think installing one is looking like the best option, although I'm not sure which of the four terminals on the switch I would be bridging :idea: Where would the resistor go? (Please excuse my ignorance- I can recap, test components and replace as necessary, but adding something I find tricky)
     
  8. petehall347

    petehall347 the brandy coffee man Subscriber

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    23,087
    Location:
    uk.. the middle bit
    no telling really . if there isnt one add one ..if there is one replace it . or better still modify it with a triac .
     
  9. bryans12v

    bryans12v Marantz Junkie Subscriber

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    I just put one together to give you an idea. Definitely shrink wrap any exposed component leads.

    You have your power line on one side of the switch. Just connect each lead to each of the two posts on the other side of the switch.

    20170317_192532.jpg

    Edit: I would also replace the swith while you're in there. Especially after all that arcing.
     
    Last edited: Mar 17, 2017
  10. VintageMad89

    VintageMad89 Active Member

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    Wow, thanks that's a big help!

    The switch appears to have 4 contacts on it- would than mean 2x caps and resistor? Is there a way to tell which side is the power side?
     
  11. bryans12v

    bryans12v Marantz Junkie Subscriber

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    Of course, glad to help.

    Took another pic. Say the lead clips is your hot line coming in and out of the switch. You'll want to go across that line on the opposite pins as shown below.

    20170317_194253.jpg

    Just one cap, one resistor. It won't matter if there are wires there, they just go to the switched outlet on the back panel. AS long as it goes across the main line is fine.
     
    Last edited: Mar 17, 2017
    Hipocrates likes this.
  12. VintageMad89

    VintageMad89 Active Member

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    209
    Location:
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    Ah, I see now! I did a quick search of pics of the switch but most were fairly useless :crazy: Only a few included a cap.

    Damn I wish I had the parts in stock so I can get cracking. Oh well, to my supply store soon! Typical the switch is a bit of a b*****d to get to :rflmao:

    I really appreciate your help!
     
  13. bryans12v

    bryans12v Marantz Junkie Subscriber

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    If you were in the US, id post them but to Scotland would take a few weeks probably.

    Cool side note, my small local airport just added Norwegian one way flights to Scotland for 69 bucks!
     
    Last edited: Mar 17, 2017
  14. VintageMad89

    VintageMad89 Active Member

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    Location:
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    Yes, I've heard Norwegian have started flights from Edinburgh recently- any time I've travelled to NY it's been with Continental, then United from Glasgow. At 69 bucks I must give this a try!
     
  15. bryans12v

    bryans12v Marantz Junkie Subscriber

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    I think it may be a little more expensive coming this way as fuel is higher over there but still cheap!
     
  16. VintageMad89

    VintageMad89 Active Member

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    Yeah, can't argue with that!

    Anyway, I will get the parts together over the weekend and let you know how it goes. Thanks again for your help!
     
  17. bryans12v

    bryans12v Marantz Junkie Subscriber

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    Location:
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    I forgot to mention, if you install a new switch and it's not jumped across already, you'll want to add jumped wires across it like this.

    1489796007479658206588.jpg
     
  18. VintageMad89

    VintageMad89 Active Member

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    209
    Location:
    Scotland
    Thanks, I'll be using the original switch. Will that matter?
     
  19. bryans12v

    bryans12v Marantz Junkie Subscriber

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    Location:
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    If it has a switched outlet, it will already be jumped.

    No worries. Take a pic and post it up when your almost done and we can verify it's correct.
     
  20. VintageMad89

    VintageMad89 Active Member

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    209
    Location:
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    Mine is the UK model so there are no AC outlets- it has a multi voltage adaptor though?

    [​IMG]
     

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