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To remove a blown or suspect fuse from its fuse holder, use only a number 2 Phillips
screwdriver to prevent damage to the fuse holder. Simply press lightly on the fuse-holder
cap and turn counterclockwise. The cap will "pop" out after several turns. To replace the
fuse-holder cap, once the fuse has been replaced and properly installed in its seat on the
fuse-holder cap, press lightly inward, once the fuse and cap have been inserted in the
fuse-holder body, and turn the cap clockwise until it is firmly seated in the fuse-holder body.
Be certain not to cause cross-threading of the fuse-holder body and cap to prevent
damaging the fuse holder. DO NOT FORCE THE FUSE-HOLDER CAP INTO THE
THREADS. Seating of the cap in the fuse-holder body should be easily accomplished
without excessive force.
AC LINE CORD
The AC cord is a 3-conductor, heavy-duty cable supplied with a heavy-duty, molded 3-prong
AC plug. It provides the power to operate all the GFA-555ms's circuits. Its plug should be
inserted in a standard, 120V/60Hz outlet with a minimum capacity of 15amperes and should
have a dedicated branch circuit. It is not recommended that you connect the GFA-555ms
into a branch circuit on which other appliances are used. Since conventional household
branch circuits are often limited to 15amperes, when the GFA-555ms is used in conjunction
with other appliances on the circuit, you may find the current available for the GFA-555ms is
insufficient; particularly in systems using very low-impedance, highly reactive loudspeakers.
NOTE
The GFA-555ms’s power cord is supplied with a "polarized" AC plug as required by
UL/CSA standards and the National Electrical Code. To minimize the risk of electrical
shock, and to insure minimal hum from the system, do not defeat the polarity-insuring
feature of the plug (one wide blade and one narrow blade). To prevent electrical shock, do
not use the polarized plug With an extension cord or receptacle, or other outlet, unless the
blades can be fully inserted to prevent blade exposure.
AC LINE FUSE
The AC LINE FUSE protects the electronic circuits of the GFA-555ms. This fuse, normally,
will blow only if there is an overload within the GFA-555ms. Since this fuse has been
designed to protect the electronic circuits in the GFA-555ms, it is recommended that it be
replaced only with one of the fuses listed in the table below. Please note that the fuses listed
are for operation of the amplifier on 120VAC/60Hz. For the correct fuse values to operate the
GFA-555ms on other voltages and frequency, please consult the Service Manual for this
amplifier available from the ADCOM Technical Service Department.