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2.2 DISPLAY UNIT
The display unit consists of the following sections as shown in the block diagram on the
next page.
(1) Power Supply (01 P5737)
(2) Amplifier Board (01P5725)
(3) Display and Signal Processing Board (01P5726)
(4) Panel Board (01P5729)
(5) Color Monitor (TM-140F2 or CDKC-14CE151)
2.2.1 Power Supply (POW 01P5727)
The power supply circuit is made up of a PWM (Pulse Width Modulation). Inverter
employing switching regulator techniques like other Furuno-made echo sounders and
radars. The PWM inverter universally operates on ship's mains of 10 - 40 VDC. Against the
vibration of the load condition, it regulates the DC output line by changing the width of its
output pulse. The power supply circuit provides +12 V, -12 V, +5V, and 130 V for the color
monitor.
Each line is connected to the respective circuit as shown in Fig. 2.15.
Fig. 2.15 Power Supply for Display Unit
2-10
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