Boss CE-300 Super Chorus Dial Replacement

Written By: Haley Lansdon
  • Comments: 0
Boss CE-300 Super Chorus Dial Replacement

Difficulty

Moderate

Steps

16

Time Required

30 minutes

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.

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    • 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.

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

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

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

    • Repeat the previous bullet on the right side.

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    • Slide the top panel away from the front.

    • Lift the panel up and off.

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

    • Two 7.5 mm

    • Two 10 mm

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    • Lift the bottom panel up and off.

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    • 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.

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    • Remove all dial covers.

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    • 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.

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

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

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    • Remove the three switch covers.

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    • 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.

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    • 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.

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    • 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.

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.

Author

Haley Lansdon

Member since: 25/09/24

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