Wednesday, October 09, 2013

HAFLER - 9180 _ HAFLER - 9270 - POWER AMPLIFIER _ SCHEMATIC [Circuit Diagram]

Power Rating: 9180:
105 watts per channel (8 ohms)
150 watts per channel (4 ohms)
300 watts mono (8 ohms)
9270:
135 watts per channel (8 ohms)
200 watts per channel (4 ohms)

400 watts mono (8 ohms)
The 9180/9270Amplifier is equipped with a Thermal Protection System that constantly monitors the temperature of the heat sinks. When the heat sink temperature reaches a pre-determined level, the amplifier’s circuitry is electronically shut down through the same system that provides the Soft Turn-On function. When the heat sinks cool to a safe operating temperature, normal operation of the amplifier resumes.
Depending upon which new voltage is chosen, it may be necessary to change the AC line fuse. Locate the clip-mounted Line Fuse adjacent to the Voltage Selector plug. Replace the fuse with a new slow-blow fuse as follows.
9180: 100 and 120 VAC: 7 amp.  220 and 240 VAC: 4 amp
9270: 100 and 120 VAC: 10 amp.  220 and 240 VAC: 5 amp
The 9180/9270 Amplifier employs a single control per channel to set the bias operating point of the output stage. This bias point is factory set, and normally should not require adjustment for the life of the product. However, should improper bias be suspected, or if repairs have been made that would require a readjustment of bias.
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