Voltage Change - Classe Audio CA-301 Service Manual

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: 12A slo-blo, Classe part number MDA-12A
For 220 – 240v units: 10A slo-blo, Classe part number MDA-10A
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 (B013X)
Mosfet fuses: 0.75A, Classe part number 225.750
The Mosfet fuses are located on top of the control board (B013X)

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 Z1
100VAC Blue
120VAC Gray
220VAC Gray
240VAC Gray
Mains
100/120VAC
220/240VAC
PRO-SVR_LEGACY
Primary wires, main transformer
Z2 Z3
Black White Orange
Yellow White Orange
Black White
Yellow White
Jumpers, auxiliary transformer
Position 1 Position 2
In Out
Out Out
Z4 Z5 Z6
- -
- -
- Blue Orange
- Blue Orange
Position 3
Out
In
Z7 Z8 Varist
Gray Yellow
Blue Black
- Yellow
- Black
Position 4 Position 5
Out In
Out Out
or
140
140
250
250
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