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2285b

  1. X

    Marantz 2285B No Sound. Preamp Issue help needed.

    Testing this Marantz 2285B, Quick PS board relay engagement which is good. Tested through Main in on back amp section works beautifully. Preamp section is dead. barely any sound at all on the right channel and very distorted. Left Channel is dead. IF I press on the preamp board it will come...
    • xalara76
    • Thread
    • 2285b marantz marantz2265b marantz2285b marantzreceiver noaudio nooutput nosound preamp
    • Replies: 5
    • Forum: Marantz Audio
  2. V

    Marantz 2285B static noise and weak channel

    Hello AKers ! :) First of all, sorry for my poor English, i'm a french reader of this forum. I have a problem with my beautiful Marantz 2285B, which has been completely recapped (except FM boards, main dual-core filter capacitors and the output transistors). When I turn it on and after the...
  3. V

    Marantz 2285B right channel issues

    Hello AKers ! First of all, sorry for my bad English, I'm a French guy looking for some help with my Marantz 2285B ;) Here is the problem: In "Phono 1" mode, with my L100 Centurys hooked, I have no sound in the right channel... The weird thing is that it doesn't do it all the time... - If I...
    • Vincent68210
    • Thread
    • 2285 2285b 2285bd channel failure channel issues marantz no sound no sound left channel no sound right channel
    • Replies: 11
    • Forum: Marantz Audio
  4. Randy B

    2285B VS 2325??

    I use a 2285B for my daily driver and I love it. Just stumbled upon a 2325 and was wondering what the benefits would be. Before a plunk down a huge chunk of cash I thought I'd ask the pros. Any opinions about the pros and cons of the 2285b vs the 2325? I'm thinking about reliability (I'm a...
  5. Mike Sweeney

    Source of 2285B parts :)

    So when I bought my 2285B, I didn't know it was such a rare beast. I got it done but I had a poor condition balance pot and a volume pot that had a bent shaft. Both are unique to the 2285B and the balance pot has a detent click in the middle. What I found after a significant amount of digging...
  6. D

    2285BD,,,,,, again .

    Hello , all . I am new to this forum ,site , and Vintage AUDIO. I bought a new 2285B receiver ect not long after I graduated High School in 1976. I got one of the first production units as I had it before the end of the first semester , of Jr College. But back in now a d my son bought me a...
  7. Mike Sweeney

    Share and share alike ;) 2265B and 2285B

    So a while back I restored a 2285B but I knew it had a bent volume control shaft and a flaky balance pot. And it's like finding hen's teeth to get replacements. What i found sorta by accident is the that the tone board and parts on the 2265B and the 2285B are the exact same down to having the...
  8. Mike Sweeney

    Pre-amp issue? 2285B

    So playing records or tapes over the headphones sounds good. But when I kick in the speakers distortion and fuzz are the main components. Radio seems fine without distortion. None of the filters seem to affect it. The only thing I can say that I know is bad is the balance control. It's rough...
  9. Mike Sweeney

    Veenering this and that

    So here is a question to those that have worked on restoring Marantz cases. I have two.. one came with a 2226B and one came with a 2285B. Both are OEM and were sold with the case. In the 2285B case, it does not have the metal shield at all and the screw holes for it were never used ( still has...
  10. Mike Sweeney

    2285B just about done 95%

    So I'm at the very end with just a few odd things left. I have some wires I need to unwrap and re-wrap/solder because of corrosion. I didn't see the itty bitty board for the main bank of switches with it's four or five caps so I need to pull the tone board out. again.. and do that plus clean up...
  11. Mike Sweeney

    New transistor smell :)

    So after recapping, potting and cleaning the main amp, I could not get the left channel dialed to 0 mv DC Offset .. it kept swinging about +- 1mv which is not much but it was bugging me. So I ordered up a whole set of transistors ( 4 PNP, 4 NPN) for the 2285B. Swapped them with new mica and...
  12. Mike Sweeney

    2285B replacement trimer pots work :)

    Not pretty but they do work. I found out after I had ordered my first set of pots ( 1K and 2K) that the 1K pots had been changed on the schematic to 300 ohm and not the part lists 1K :/ And then I found I could not get the 300 ohm in the same model/series as my 2K. So now I have two different...
  13. Mike Sweeney

    Seen before? 2285B bias question

    I replaced the pots with new ones and everything dials in perfectly except the rigtt channel floats about +- 1mV instead of zeroing out like the left does. Just enough to be annoying. Doesn't seen to be hurting anything other than my pride :) Ideas before I go into a rabbit hole?
  14. Mike Sweeney

    Replacement 2285B pots

    I’m replacing the main amp adjustment pots and thought I would share how I did it. I took a page form a picture I saw where the tech made a nice etched board to mount a new trimpot on it. In my case, I used some perf board which is not as pretty but worked pretty well. I also found that the...
  15. Mike Sweeney

    HFE question

    I'm looking at two subs for the 2SD427/2SB557 NPN/PNP transistors for a Marantz 2285B. The specs on the two are the same ( 250 volts, 16amps, 4Mhz, 250 watts) except for the HFE rating. The OEM was >20 at 5 volts. One sub is 25@5 volts.. but the other recommended is 15@4 volts. So my...
  16. Mike Sweeney

    Riddle me this Mr Speaker Relay

    I think I lost a cap or something on the relay board. Here's the story.. got a beat to hell 2285B but I was able to bring it to life after a fashion :) One of the two filter caps was bad so I pulled it and jumped in a new pair of 10,000 uf caps to test. Hit the power and around 100 volts ( on a...
  17. Halisson

    Help Repair Marantz 2285B - Bias Adjust

    Hello friends, greetings from Brazil. I'm doing the repair on a Marantz 2285b and I'm having a hard time getting the BIAS adjustment. DC OFFSET + - = 0vdc. Reading based on q710 ranges from 0.7vdc to 2.1vdc, stirring in the BIAS trimpot Base of q709 does not vary anything, staying at -0,800vdc...
    • Halisson
    • Thread
    • 2285 2285b adjustment bias adjustment bias settings marantz offset
    • Replies: 2
    • Forum: Marantz Audio
  18. Johnny JJ

    Marantz 2285b power supply P800 capacitor value?

    Hi, I'm a newbie to this site so please bare with me. I am rebuilding my marantz 2285B starting with the power supply (P800). The question I have is capacitor C804 is shown as 10uf/50v in the schematic however what is installed on the board is a 47uf/50v. Can anyone confirm what should be in...
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