McIntosh MCC302 manual How to Replace the Fuses, Four hex bolts with the supplied 3/32 hex key

How to Replace the Fuses

How to Replace the Fuses

If the MCC302 produces no sound, there is no Illumination of the Nomenclature on the Top Glass Panel, and the power connections seem secure, one or more of the Amplifier’s Fuse(s) may have failed. Under normal operating conditions your amplifier’s fuses should not fail. Failure of a fuse is usually an indication of a problem. Replacing the fuse, if there is problem in the amplifier, may incur a risk of further damage. Refer to figures 9, 10 and 11.

Caution: Disconnect the Amplifier from the Vehicle Battery (or DC Power Supply) as Potentially Dangerous Currents exist inside the amplifier.

1.	Before accessing fuses, disconnect both the positive
	and negative power cables from the DC input
	terminals on the left side of the amplifier using a 5/
	32” hex key.
2.	Remove the Top Glass Panel by first removing the
	four hex bolts with the supplied 3/32” hex key.
3.	To remove the Top Glass Panel, attach the supplied

Figure9 RemoveRemoveTopThreCovereScSrewscrews

	suction cup to the top center of the glass panel and
	carefully raise it high enough to put your hand under.
	Temporarily place the removed glass panel in a safe
	place, remove the suction cup and save it for future
	use.
4.	Remove the Phillips Screws holding the End Caps on
	both sides of the amplifier and lift the end caps off.
5.	Remove the two Phillips Screws, one is located above
	the row of Controls/Switches and the other near the
	Bottom Edge of the Gold Faceplate Control Panel.
6.	Remove all 5 crossover, equalizer and sensitivity
	knobs.
7.	Remove the Gold Faceplate Control Panel.
8.	Remove the fuses with needle nose pliers, taking care
	to avoid hitting parts on the ciruit board.
	Note: To determine if the fuse has failed, examine the
	link between the two fuse legs to see if it has a
	break in it.
9.	Replace the fuse with one of the same type and
	rating, as unauthorized substitutions may prove
	hazardous to you and the amplifier.

10.When reinserting the fuse, set it in place with the pliers, then push it the rest of the way in with your finger to avoid having the pliers slip and hit the circuit board.

11.Re-install the Gold Faceplate Control Panel and all 5 crossover, equalizer and sensitivity knobs.

12.Re-connect the power cables to the vehicle battery. If the replacement fuse(s) fails again, have the amplifier repaired at a McIntosh Service Center.

Figure10

Figure11

LocationRemoveofthethreeThreefusesScrews

12