Figure 11
The 3-channel amp assembly (See Figure 11) after it has been removed from the unit. If one or more of
these transistors are defective, it’s necessary to: remove the top cover, the rear panel, the center stack of
sub-assemblies, disconnect all the connections from the power supply, front control panel, both amp
assemblies, then unscrew the suspected bad amp assembly. At this point the technician should unsolder 99
connections, unscrew the PC board from the heat sink, test the transistors to find the defective one, unscrew it
from the heat sink, replace it rear on the heat sink, reattach the PC board to the heat sink, resolder all the
transistor legs rear onto the PC board (being careful not to use too much heat), reinstall the amp assembly to
the chassis, reinstall the center stack of PC boards rear into the chassis, connect the power supply, front
control panel, amp connections to the center stack of sub-assemblies (being careful not to get the
connectors mixed up), and attach the speakers (or load) to test the unit.
Figure 12
Another view of the 3-channel amp assembly.
AVR8000
harman/kardon
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