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Service Guide ML172/ML182 Series
Chapter 2 Principles of Operation
2.1.1 Power Supply
The Power Supply consists of the power supply board and the transformer. The Power Supply Board,
which contains the ON/OFF Switch, Line Filter and related circuits, uses a 1 amp fuse for over-current
protection. This circuit board transforms the AC input voltage into 7.6 VAC, 24 VAC and 10 VAC for use
on the Control PCB. The Transformer contains a thermal fuse for protection against overheating. If the
thermal fuse opens, the transformer must be replaced.
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