Classe Audio CAV-180, Service Manual

Page: 12 / 24

PRO-SVR_LEGACY Page 12 of 13
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: 8A slo-blo, Classe part number MDL-8A
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 control board (B2E7X)
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)
Primary wires, main transformer
Mains N1 N2 X1 X2 X3 X4 X7 X8 Varistor
100VAC White Orange Gray Yellow Blue Black - - 140
120VAC White Orange Blue Black Gray Yellow - - 140
220VAC White - - Yellow Gray Black Blue Orange 250
240VAC White - - Black Gray Yellow Blue Orange 250
Jumpers, auxiliary transformer
Mains Position 1 Position 2 Position 3 Position 4 Position 5
100/120VAC In Out Out Out In
220/240VAC Out Out In Out Out