Troubleshooting; Performance Graph - Yamaha PC4800N Owner's Manual

Troubleshooting

The following table lists the main causes of abnormal operation and the corrective measures required as well as the
protective circuit operation in each case.
Indicator
CLIP indicator lights up
PROTECTION indicator
lights up

Performance graph

10000
PC9500N
1000
100
10
1
1
PC4800N
10000
1000
100
10
1
1
14
Possible Cause
There is a short at the
amplifier's speaker
outputs, the speaker's
inputs, or in the wiring.
The impedance of the
connected speaker
is too low.
The heat sink temperature
has exceeded 90 C.
A DC voltage of 2 V
or greater was detected
in the amplifier's output
circuit.
10 100 1000 10000
10 100 1000
Remedy
Locate and remove
the short.
Use a speaker with a
minimum impedance
of 4 (8 in Bridge
mode).
Check the ventilation
around the amplifier
and improve the airflow
if necessary.
Consult your dealer
or a Yamaha service
center.
Mode:STEREO
Both ch
Power Consumption[W]
Output Power[W]
Mode:STEREO
Both ch
Power Consumption[W]
Output Power[W]
Protection Circuit
The PC limiter circuit
activates to protect
the power transistors.
The thermal protection
circuit activates to
protect the power
transistors.
The output relay activates
to protect the speaker
system.