Picotest M3500A Service Manual page 12

[Step 3]
There are four wires in different colors on the transformer. Two of them
connect to the power entry according to the regular line voltage selections
for your country as shown in Figure 2-8.
Transformer
[Step 4]
Please refer to the Table 2-1 to connect the wires for your need.
Power Line Voltage
100 Vac
120 Vac
220 Vac
240 Vac
Power Entry
Figure 2-8
Figure 2-9
Wire color
Brown
Red
Orange
Yellow
Table 2-1
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