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Naim 102 Servicing?

Discussion in 'd.i.y.' started by Suffolk Tony, Aug 26, 2021.

  1. Suffolk Tony

    Suffolk Tony Aim low, achieve your goals, avoid disappointment.

    Hi folks,

    A fellow fishie has one of the above and is wondering if, after some 22 years, it needs a service. Don't know much about them myself - any caps etc. that could do with service, please? Are there any measurements worth looking at?

    Thanks for any help in anticipation.
     
    Tony Lockhart likes this.
  2. martin clark

    martin clark pinko bodger

    Very little as I recall; there's no onboard power supply so no reservoirs caps to bake out (since it'll be using a Hicap or equiv)

    So after that most of whats onboard are 10uf/35v tantalum caps (and a larger one likely 47uF in each of the gain stage feedback loops, one per chnnel) that effectively live for ever in Naim preamp use - signal coupling, supply rail decoupling and very conservative voltage ratings mean there's really no obvious heat/wear-out mechanism for these. So no need to change those. The very few electrolytics I can recall are mostly bulk decoupling from the relay logic, so not actually part of the signal path at all (and fed separately by a Napsc.) There are also no service adjustments inside,no bias settings to tweak

    If it works happily now, and the owner wants it retained as-is- there's nothing to do :)
     
    Suffolk Tony likes this.
  3. Tony Lockhart

    Tony Lockhart Avoiding Stress, at Every Opportunity

    Thank you. I’m the fishee that Tony mentioned.
    My hicap is due its second service about now, so that’ll be done when I get around to it.
    Cheers
     
  4. martin clark

    martin clark pinko bodger

    You're welcome, Persons Tony. Enjoy the 102 :)
     
    Suffolk Tony and Tony Lockhart like this.
  5. Bad Parameter

    Bad Parameter pfm Member

    You might want to replace the phono board e-caps if TT listening is critical for you, though as stated not a lot of voltage or heat in there. Something like Panasonic FR should be good for the entire next century, unless you think there's some magic to the Naim Sic-Safcos.

    You should recap the NAPSC. I did mine after I realized it has been on for 20 years straight as Naim in their obtuseness decided not to put a f&^%ing switch on it. I have two one for a Headline, the NAPSC is a tiny 16V SNAPs w/ 2X 10uf/50v and 1X 2200uf 50V all e-caps. I improved its pedigree and replaced with 2X tants and a 4700uf Kendeil snap-in that fit. Careful to trim leads under the PCB very flush. If the filter cap is taller it can push the pcb down and short to the case, luckily the fuse blew and the regulator survived. Put a little piece of acetate under it just to be safe. Sadly, the NAPSCs are still on all the f&^%ing time.
     
  6. Tony Lockhart

    Tony Lockhart Avoiding Stress, at Every Opportunity

    Thank you.
    No vinyl here, but the NAPSC info will be handy.
     
  7. Bad Parameter

    Bad Parameter pfm Member

    IIRC 22mm D x 30mm H is the absolute max for the filter cap.
     

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