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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: 10A slo-blo, Classe part number MDA-10A
For 220 – 240v units: 4A slo-blo, Classe part number MD
The main fuse is located at the back of the unit, on the rear panel.
Control board fuse: 0.50A, Classe part number 225.500
The control board fuse is located on top of the supply board (B1B2X)
Mosfet fuses: 0.75A, Classe part number 225.750
The Mosfet fuses are located on top of the supply board (B1B2X)
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 primary wires of the main transformer as described 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.
3. Set the jumpers accordingly on the auxiliary transformer located at the back of the unit on the top
main board on the left-hand side of the auxiliary transformer (see tables below)
Mains
X1
100VAC
Grey
120VAC
Blue
220VAC
-
240VAC
-
Mains
100/120VAC
220/240VAC
PRO-SVR_LEGACY
Primary wires, main transformer
X2
X3
Yellow
Blue
Black
Grey
Yellow
Grey
Black
Grey
Jumpers, auxiliary transformer
Position 1
Position 2
In
Out
Out
Out
X4
X5
X6
Black
Orange
White
Yellow
Orange
White
Black
-
White
Yellow
-
White
Position 3
Out
In
X7
X8
-
-
-
-
Blue
Orange
Blue
Orange
Position 4
Position 5
Out
In
Out
Out
Varist
or
130
130
250
250
Page 12 of 13
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