Power Amplifier Owner's Manual

12 XM4180/XM4080/XH200 Owner’s Manual
■ Speaker Connection
1Turn off the POWER switch.
2 Remove the cover attachment screws and remove the
protective cover from the speaker terminals.
3 Remove about 15 mm of insulation from the end of each
speaker cable.
4 When using 5-way binding posts (XM4180, XM4080)
Pass the bare wire through the holes in the appropriate
speaker terminals. Tighten the terminals to securely clamp
the wires. Refer to 9 page for speaker polarities.
Be sure that the bare wire ends do not jut out from the ter-
minals and touch the chassis.
When using barrier strip terminals (XH200)
Wrap the wire around the terminal as shown in the illustra-
tion, and tighten the screw to securely clamp the wire.
Refer to 10 page for speaker polarities.
Be sure that the bare wire ends do not jut out from the ter-
minal and touch the chassis.
5 Reattach the protective cover over the speaker termi-
nals.
Troubleshooting
The following table lists the main causes of abnormal operation and the corrective measures required as well as the protec-
tive circuit operation in each case.
Screw
15mm*
Speaker
cable
Bare wire
Chassis
* Actual size
Speaker cable
Wire
should not
touch the
chassis.
* Actual size
Indicator Possible Cause Remedy Protection Circuit
CLIP/LIMIT
indicator
lights up
There is a short at the amplifier’s
speaker outputs, the speaker’s
inputs, or in the wiring.
Locate and remove the short.
The PC limiter circuit
activates to protect the
power transistors.
The impedance of the connected
speaker is too low.
Check the impedance rating of the
connected speaker and make sure
that it conforms to the impedance
indicated at the speaker terminals
on the amplifier.
PROTECT/
MUTE indica-
tor lights up
The temperature of amplifier is too
high.
Let the amplifier cool and check
that ventilation around the amplifier
is appropriate for operation, as sug-
gested in the Precautions section.
The thermal protection
circuit activates to pro-
tect the power transis-
tors.
A DC voltage of ±2 V or greater
was detected in the amplifier’s out-
put circuit.
Consult your dealer or a Yamaha
service center.
The output relay acti-
vates to protect the
speaker system.
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