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General Studio Tips

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Op-Amp Modification

Warning!

The following “Destructions” are provided out of an overwhelming request by fellow VS Planeteers. Everything you are about to do is at your own risk. This will void any warrantee that you may have with Roland. This “Destruction Modification” is by no means sanctioned by Roland. You are fully responsible for your actions and safety. By no means will you hold anyone legally or morally responsible for any alteration you or anyone else performs on your property. Only those who possess advanced skills should attempt this or any other modification to their property.

It is strongly recommended that you do not attempt this modification.

©Gerry Marshall 2003 

 

On with the show…

    

 

 

 

 

 

 

In the beginning, the question was debated; What could be done to make the VS2480 sound better all on its own? One solution is to replace the aging 5532 op amp with something newer. Get your tools together, crack open a cold one and let’s get started. Thanks to Mike for being an instigator.

      

 

 

1.Start by removing the hard drive. (For the internal hard drive model, it will be anchored in). Be careful from here on out. Remove 3 screws located just below the gain knob section on the top surface. Remove all gain, headphone and monitor knobs. Then flip the machine over with the back of the unit facing you. Remove 38 screws from the bottom plate (but not the screws holding the FX bay plate, not necessary). Then remove 17 screws that hold the back face panel to the chassis. Remove the back face panel, then the bottom panel carefully.  

 

  

     

      

2. Once the back face panel and bottom cover are removed, you will see 4 main sections. Remove the power section. (The power section is located on the lower right). There are 6 wire plugs to be removed from the top. Follow the diagram and carefully remove plugs 1 through 6.

3. Remove 3 screws from the power section cage. There are 2 more plugs to remove. First remove the (1) larger green and white wire plug from the first circuit board. Then carefully tilt the power section back at a height of no more than 3”. Reach under the cage and remove the (2) smaller green and white wire plug from the third circuit board assembly. Slowly remove the power section by lifting it straight up.

    

      

 

 

 

 

 

4. Moving to the circuit board section, follow the diagram and remove 4 wire plugs from the first circuit board. Then remove 6 screws from the top of the first circuit board. (Any installed FX cards do not have to be removed). Remove the 12 screws (that hold the first circuit board) from the back plate. (There will be 4 screws and 8 3/16” hex). Carefully lift the first circuit board out.

   

 

5. Remove 4 screws from the metal cage attached to the second circuit board. Lift the small plate out to show the hidden wire plug. Remove wire plugs 1 through 5 as shown above. Remove 8 screws from the back plate and carefully lift out the second circuit board with its metal cage attached. Once the second circuit board is removed, its metal cage can be removed. On the top of the second circuit board, there will be 2 op amps for the headphones. Remove these op amps and install sockets in their place. (Read removal warning before doing this operation). New op amps can now be installed and removed as newer technology becomes available.

 

    

 

         

 

 

 

 

 

6. On the opposite side of the second circuit board is where the “Preamp Fix” is performed. 

 

     

 

 

7. Remove the Blue and White wire plug from the third circuit board assembly. Remove 7 screws from the metal cage that hold the third circuit board. (Leave the three circuit board screws alone for now). Carefully lift out the metal cage. Turn the third circuit board cage over and remove 17 nuts and washers with a ½” socket. Next remove 16 screws from the XLR sockets. Turn the cage back over (facing down) and remove the 3 screws holding the third circuit board to the metal cage. Lift the circuit board straight up and out. Everything was easy to this point. Now comes the real fun!

 

  

    

8. The original stock op amps are attached directly to the circuit board and are an absolute pain in the ass to remove. The best way to extract them is to carefully cut all 8 legs off each op amp first. Then carefully remove the legs from the circuit board one at a time.

WARNING! If you do not thoroughly melt the solder that holds the legs, before you extract them, you will pull out part of the circuit board material. That would be a bad thing to do!

After all of the original op amps are removed, sockets can be installed in their place on the circuit board. Now the new op amps can be installed and changed as better technology becomes available. I have personally chosen the OPA2604 op amp for all 16 inputs and the OPA2134 for the headphone section. Feel free to explore other options but always be mindful of pin configuration. Time to put it all back together…

Good luck!

(Back to Preamp Fix Page)

 
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