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Fuses
EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING, OR
TROUBLESHOOTING IN THE POWER SUPPLY AREA. UNIT MUST BE DISCONNECT
FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED USING A 100W
INCANDESCENT BULB.
WHEN REPLACING FUSES, PLEASE MAKE SURE THAT THE FUSE HOLDERS ARE
HOLDING THE FUSES VERY TIGHTLY. A LOOSE FUSE HOLDER CAN TRANSLATE INTO
DISTORTION ON TOP OF THE SIGNAL.
Main fuses:
For 100 – 120v units: 15A slo-blo, Classe part number MDA-15A
For 220 – 240v units: 12A slo-blo, Classe part number MDA-12A
The main fuse is located at the back of the unit, on the rear panel.
Rail fuses: 15A, Classe part number GDB-15A
The rail fuses are located on the device boards.
Mosfet fuses: 0.75A, Classe part number 225.750
The Mosfet fuses are located on top of the main board.
Voltage Change
EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING, OR
TROUBLESHOOTING IN THE POWER SUPPLY AREA. UNIT MUST BE DISCONNECT
FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED USING A 100W
INCANDESCENT BULB.
1. Set the jumper position according to the table below.
2. Replace the varistor, according to new line voltage, following Classe's recommendations. If varistor is
not available, remove old varistor and leave it empty.
PRO-SVR_LEGACY
Jumper positions, main transformer
Mains
Jumper 1
100VAC
A
120VAC
A
220VAC
B
240VAC
B
Jumper 2
Jumper 3
E
F
C
D
E
-
D
-
Varistor
221
221
391 / 441
391 / 441
Page 13 of 14
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