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Boss CE-300 Super Chorus Dial Replacement

Introduction

This guide provides step-by-step instructions to replace the dials on the Boss CE-300 Super Chorus, a vintage analog effects processor known for its rich chorus sounds. The dials, which control parameters like chorus level and tone, may wear out over time, resulting in inconsistent adjustments or complete failure. Replacing them restores functionality and ensures precise control.

The process involves disassembling the device, removing the faceplate, and carefully de-soldering the old dials from the circuit board before soldering new ones in place. Essential tools include a Phillips #2 screwdriver, 11mm and 14mm wrenches, a soldering iron, and a desoldering pump or braid for safe removal of solder joints.

This task requires basic soldering skills and attention to detail to avoid damage to the circuit board. Follow each step carefully, and ensure the device is powered off and unplugged before beginning to ensure safety and success.

What you need

  1. Boss CE-300 Super Chorus Dial Replacement, Top Panel: step 1, image 1 of 1

    • Use a Phillips #2 screwdriver to remove the 3 14.8 mm screws located on the left side of the CE-300.

    • Repeat the previous bullet on the right side.

    Edit

  2. Boss CE-300 Super Chorus Dial Replacement: step 2, image 1 of 1

    • Remove the two 10 mm bolts using a Phillips #2 screwdriver.

    Edit

  3. Boss CE-300 Super Chorus Dial Replacement: step 3, image 1 of 1

    • On the back of the CE-300, remove the two 7.5 mm screws with a Phillips #2 screwdriver.

    Edit

  4. Boss CE-300 Super Chorus Dial Replacement: step 4, image 1 of 1

    • On the left side, remove the one 10 mm screws with a Phillips #2 screwdriver.

    • Repeat the previous bullet on the right side.

    Edit

  5. Boss CE-300 Super Chorus Dial Replacement: step 5, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement: step 5, image 2 of 2

    • Slide the top panel away from the front.

    • Lift the panel up and off.

    Edit

  6. Boss CE-300 Super Chorus Dial Replacement, Bottom Panel: step 6, image 1 of 1

    • Remove the following screws with a Phillips #2 screwdriver:​

    • Two 7.5 mm

    • Two 10 mm

    Edit

  8. Boss CE-300 Super Chorus Dial Replacement: step 7, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement: step 7, image 2 of 2

    • Lift the bottom panel up and off.

    Edit

  9. Boss CE-300 Super Chorus Dial Replacement, Face plate: step 8, image 1 of 1

    • Remove the single 5.7 mm screw on the left side of the face plate.

    • Repeat the previous step on the right side of the face plate.

    Edit

  10. Boss CE-300 Super Chorus Dial Replacement: step 9, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement: step 9, image 2 of 2

    • Remove all dial covers.

    Edit

  11. Boss CE-300 Super Chorus Dial Replacement: step 10, image 1 of 3 Boss CE-300 Super Chorus Dial Replacement: step 10, image 2 of 3 Boss CE-300 Super Chorus Dial Replacement: step 10, image 3 of 3

    • From the inside of the unit, pinch the 3 clips holding the faceplate in

    • Do not use any metal tool to pinch the clips. If metal damages the board, it may be unrepairable.

    • Push the clips in and the face plate will slide off.

    Edit

  12. Boss CE-300 Super Chorus Dial Replacement: step 11, image 1 of 1

    • With a 11 mm wrench or socket, remove the five nuts around the dials.

    Edit

  13. Boss CE-300 Super Chorus Dial Replacement: step 12, image 1 of 1

    • With a 14 mm wrench or socket, remove the three nuts around the jacks.

    Edit

  14. Boss CE-300 Super Chorus Dial Replacement: step 13, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement: step 13, image 2 of 2

    • Remove the three switch covers.

    Edit

  15. Boss CE-300 Super Chorus Dial Replacement: step 14, image 1 of 1

    • Use a Phillips #2 screwdriver to remove the single 7.8 mm screw on the left side of the bracket.

    • Repeat the previous bullet on the right side of the bracket.

    Edit

  16. Boss CE-300 Super Chorus Dial Replacement: step 15, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement: step 15, image 2 of 2

    • Remove the two audio jacks that are to the side.

    • Do not pull the face bracket fully off and away. Some cables will remain attached to the face bracket and to the board.

    • Carefully remove the face bracket by sliding it forward until it clears all dials, then lift up.

    Edit

  17. Boss CE-300 Super Chorus Dial Replacement, Dial: step 16, image 1 of 2 Boss CE-300 Super Chorus Dial Replacement, Dial: step 16, image 2 of 2

    • Desolder the marked joints from the "top" of the board.

    • Some dials are labeled on the board to help identify what solder joints lead to what dial. Double check that you de-solder the correct joints.

    • The second picture demonstrates desoldering of the "chorus level" dial.

    • Remove the dials.

    Edit
Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.

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Haley Lansdon

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University of Memphis, Team 1-2, Sneed Fall 2024 Member of University of Memphis, Team 1-2, Sneed Fall 2024

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