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| How to Replace the Fuses | |
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How to Replace the Fuses |
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If the MCC404/MCC404M produces no sound, there is no | Figure11 | ||||
Illumination of the Nomenclature on the Top Glass Panel, |
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and the power connections seem secure, one or more of the |
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Amplifier Fuse(s) may have failed. Under normal operating |
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conditions your amplifier’s fuses should not fail. Failure of |
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a fuse is usually an indication of a problem. Replacing the |
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fuse, if there is problem in the amplifier, may incur a risk |
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of further damage. Refer to figures 11, 12 and 13. |
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Caution: Disconnect the Amplifier from the Vehicle Battery |
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( or DC Power Supply) as Potentially Dangerous |
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Currents exist inside the amplifier. |
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1. Before accessing fuses, disconnect both the positive |
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and negative power cables from the DC input terminals |
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on the left side of the amplifier using a 5/32” hex key. |
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2. Remove the Top Glass Panel by first removing the four |
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hex bolts with the supplied 3/32” hex key. | Figure12 |
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3. To remove the Top Glass Panel, attach the supplied |
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suction cup to the top center of the glass panel and |
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carefully raise it high enough to put your hand under. |
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Temporarily place the removed glass panel in a safe |
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place, remove the suction cup and save it for future |
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use. |
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4. Remove the Phillips Screws holding the End Caps on |
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both sides of the amplifier and lift the end caps off. |
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5. Remove the two Phillips screws located between the |
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low and high pass filter controls. |
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6. Remove all 12 crossover, equalizer and sensitivity |
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knobs. |
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7. Remove the Gold Faceplate Control Panel. |
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8. Remove the fuses with needle nose pliers, taking care |
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to avoid hitting the wattmeter during removal. Do not | Figure13 | ||||
lever the pliers against the wattmeter. |
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Note: To determine if the fuse has failed, examine the link |
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between the two fuse legs to see if it has a break in it. |
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9. Replace the fuse with one of the same type and rating |
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as unauthorized substitutions may prove hazardous to |
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you and the amplifier. |
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10. When reinserting the fuse, set it in place with the pliers, |
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then push it the rest of the way in with your finger to |
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avoid having the pliers slip and hit the circuit board. |
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11. |
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crossover, equalizer and sensitivity knobs. |
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12. |
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If the replacement fuse(s) fails again, have the amplifier repaired at a McIntosh Service Center.
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