Supernova II – DAC Replacement #2

supernova-ii_2

Novation Supernova II – DAC Replacement #2

DAC Replacement Service:
I can offer a service where I will replace the faulty DAC on your Supernova motherboard on both the Keyboard & Rack versions.

Please see this page for details:
Sector101 Supernova 2 DAC Replacement Service

A Supernova II owner recently got in contact regarding the noise issue he was having with his unit.

When I replaced the DAC in my unit the original DAC was still behaving so I had no first-hand experience of the noise problem. The owner sent me his main PCB and I could now hear the problem. It is a random crackling sound on the Headphones and Master Outputs 1 & 2.

The faulty DAC is U45 on the main PCB – a Cirris 4391KZ 24Bit DAC.

The Cirris 4391KZ is now obsolete and reliable vendors do not stock it anymore. But there is a newer version – the 4391AKZZ. Happily the new “AKZZ” version behaves like the old “KZ” version. The extra “A” denotes a newer version, and the extra “K” means it is ROHS compliant.

The photo shows my Supernova II chassis with the faulty PCB connected up to the PSU and front panel ribbons. When the power was turned on the noise came through on the headphones & master outputs.
01_pcb_full


Hot-air Rework Preparation:
The photo below shows the faulty DAC. The IC type is “4391KZ”. The date code shows “GJA0038” so it was from batch GJA and manufactured on week 38 in the year 2000.

Kapton tape has been placed around the other components to protect them from the hot air tool.
02_original_dac


Old DAC Removed:

Here we see the old DAC removed and set to the right. The residual solder on the PCB pads needs to be removed before the new DAC can be placed.03_dac_removed

Now that the pads have been cleaned the new DAC can be placed:
04_cleaned_new_dac


New DAC Fitted:

The new DAC has now been soldered on.
05_placed_01

The new DAC type is “4391AKZZ”. The date code shows “BXOD1418” so it was from batch BXOD and manufactured on week 18 in the year 2014:06_placed_02

With the new DAC in place the Supernova II now sounds as sweet as ever!

DAC Replacement Service:
I can offer a service where I will replace the faulty DAC on your Supernova II motherboard on both Keyboard & Rack versions.

Please see this page for details:
Sector101 Supernova 2 DAC Replacement Service

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8 thoughts on “Supernova II – DAC Replacement #2

  1. Hi is there a socket for the Cirris 4391KZ chip,if possible I would like you to remove the faulty Cirris 4391KZ on my Supernova 2 rack version and a instal the socket and then a new Cirris 4391KZ chip?
    Many thanks
    my email address : just_ian2000@yahoo.co.uk

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    1. A socket for that type of chip TSSOP-20 cannot be mounted directly on the pads, and the size of the socket is too big to fit the area.

      Like

  2. Hello again,
    can you supply a socket and chip?
    I’m sure you could solder suitable wires from pads to socket legs?
    If this is possible I will send you my Novation SuperNova MKII (rack version) board for above installation and look forward for your reply.
    Many thanks.
    Ian

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    1. Hello, There is no need to put the new DAC in a socket. Once a new DAC is in place it will perform 100%.
      Adding a socket on leads will also degrade the audio signals.

      The ‘faulty DAC problem’ that plagues the SNII exists because Cirrus Logic produced a defective batch of DACs in the early 2000s. Once a new production DAC is fitted the problem will not come back. Avoid old stock DACs with date codes in the 2000s. I fit DACs manufactured in 2017.

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  3. Hi thank you for replying and advice given,I have the 36 voice model (rack) which I would like to expand to the full 48 voice as well as having the DAC replaced by the 2017 batch of DAC’s which you said have in stock which will not fail in the future.Where are you based in the UK?
    Please don’t take this the wrong way but you are asking me to pay in advance,the problem I have with that is you could take the money and the board and I would not be able to get these back.I have read all the reviews however that does not make me feel reassured.I would be happy to pay and collect or do you have a better idea?
    I am sure you would feel the same and I hope I understand things from my side.
    I look forward to your reply with the full cost of both jobs to.
    Many thanks
    Ian
    mobile : 078 668 47 461
    home : 01438 233656

    Like

  4. Hi thank you for replying and advice given,I own the 36 voice model (rack) which I would like you to expand to the full 48 voice and replace the DAC with one of your 2017 batch you say you have in stock,which you advice will not fail in the future.Where are you based in the UK?
    Please don’t take this the wrong way but you are asking me to pay in advance,the problem I have with that is you could take my money and the board and I would not be able to get these back.I have read all your reviews however they do not make me feel reassured enough.I would be happy to pay and collect on the same day or do you have a better idea?
I am sure you would feel the same way and I hope you understand things from my side.I look forward to your reply with the full cost of both jobs.
Many thanks
Ian
mobile : 078 668 47 461
home : 01438 233656

    Like

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