12
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 Amplifiers
Fuse(s) may have failed. Under normal operating
conditions your amplifiers 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
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.
Remove Top Cover Screws
Remove Top Cover Screws
Remove Three Screws
Remove Three Screws
Figure 9
Figure 10
Figure 11
Location of the three fuses
