简介
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
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Identify and remove the screws holding on the back panel. On my particular Ibanez, 6 Philips head screws are used
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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
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Identify and remove the screws holding the chassis to the cabinet
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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
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The chassis should now be free from the cabinet
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To remove the amplifier board from the chassis, you will first need to remove the volume and tone control knobs
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Use a flat blade screwdriver to gently pry the knobs off the potentiometer shafts
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After removing the knobs, use a socket wrench with the appropriately sized hex bit to remove the potentiometer nuts
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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
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Disconnect any wires going from the board to other parts of the chassis, such as to the power switch or power transformer
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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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Connect one end of an alligator lead to the chassis ground, and the other lead to an 10K ohm resistor
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Identify the power supply capacitors and touch the 10K ohm resistor's open lead to each of it's leads for a few seconds
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If you are paranoid, you may check with a voltmeter to ensure that the capacitors are safely discharged
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It should now be safe to work on your amplifier's circuit board
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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