How to Disassemble a Small Guitar Amplifier

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How to Disassemble a Small Guitar Amplifier

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Einleitung

This guide takes you through the process of disassembling a small guitar practice amp to access the internals for repair. An Ibanez IBZ10BV2 10-watt bass practice amplifier is used to illustrate the process, but the general procedure applies to most other similar, low-priced solid state practice amplifiers.

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    • Removing the back panel will allow you to access the speaker and main amplifier chassis

    • Make sure that the amplifier is unplugged before starting disassembly

    • Identify and remove the screws holding on the back panel. On my particular Ibanez, 6 Philips head screws are used

    • Usually, guitar amplifiers will have a back panel that covers only around half of the amplifier cabinet, while bass amplifiers will have a back panel that seals the cabinet completely

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    • The metal chassis houses the amplifier electronics themselves. You will need to remove it from the cabinet in order to access the power supply and main amplifier circuit board

    • Identify and remove the screws holding the chassis to the cabinet

    • Some mild adhesive may have been used as well. Once you are sure that all screws have been removed, gently push or pry the chassis away from the cabinet

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    • Disconnect the speaker as shown, and remove the power lead clamp from the cabinet

    • The chassis should now be free from the cabinet

    • Be careful to avoid contact with the main board, as the power supply filter capacitors may still be holding a significant charge

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    • To remove the amplifier board from the chassis, you will first need to remove the volume and tone control knobs

    • Use a flat blade screwdriver to gently pry the knobs off the potentiometer shafts

    • After removing the knobs, use a socket wrench with the appropriately sized hex bit to remove the potentiometer nuts

    • Make sure to keep the accompanying washers along with the nuts for reassembly

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    • Remove the nut and washer holding the 6.25mm guitar input jack to the chassis

    • Disconnect any wires going from the board to other parts of the chassis, such as to the power switch or power transformer

    • Identify and remove any other screws that might prevent removal of the board. On my Ibanez, two screws held the power amplifier IC heat-sink to the chassis. Removal of the screws and their accompanying lock washers allowed the board to be lifted off with the heat-sink

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    • Electrolytic capacitors can hold a dangerous charge for months or even years after a device has been powered off, thus, it is always a good safety practice to discharge the capacitors before working on an audio amplifier

    • Connect one end of an alligator lead to the chassis ground, and the other lead to an 10K ohm resistor

    • Identify the power supply capacitors and touch the 10K ohm resistor's open lead to each of it's leads for a few seconds

    • If you are paranoid, you may check with a voltmeter to ensure that the capacitors are safely discharged

    • It should now be safe to work on your amplifier's circuit board

Abschluss

To reassemble your device, follow these instructions in reverse order.

Tinte & Feder

Santaji

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