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T5n/T4n/T3n Owner’s Manual 11
Filter Element Cleaning
To ensure adequate cooling air intake, the filter elements must be cleaned when they have become clogged. Follow the
description below to clean the filter elements.
1. Make sure that the power to the amplifier is turned off.
2. Disconnect the power plug from the AC outlet.
3. Remove the two screws that secure the front filter grilles
to the amplifier.
4. Remove the filter elements, and wash them in plain
water. If the filter elements are exceptionally dirty, mild
detergent may be used.
5. Dry the filter elements completely.
Never replace the filter elements while they are
still wet.
6. Replace the filter elements on the air intakes, hook the
front filter grilles on the amplifier, and secure them
using the screws. (The replacement part number of the
filter element is WH66270.)
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.
Filter element
Front filter grille
Indicator(s) Possible Cause Remedy Protection Circuit
CLIP indicator
lights.
There is a short at a speaker ter-
minal, amplifier terminal, or
wire.
Locate and correct the cause of
the short.
The PC limiter circuit operates to
protect the power transistors.
The amplifier load is excessive.
Use a speaker system with an
impedance of at least 2 ohms
(STEREO/PARALLEL mode) or
4 ohms (BRIDGE mode).
TEMP indica-
tor lights.
The heat sink temperature has
exceeded 85˚C.
Check the ventilation slots and
clean the filter elements to pro-
vide better airflow around the
amplifier.
The TEMP indicator lights up to
indicate temperature warning.
PROTEC-
TION indica-
tor lights.
The heat sink temperature has
exceeded 85˚C.
Check the amplifier ventilation
conditions and take appropriate
measures to improve the airflow
around the amplifier.
Also, clean the filter elements to
ensure proper airflow.
The thermal protection circuit
operates to protect the power
transistors.
A DC voltage is detected at the
amplifier’s output.
Consult your dealer or the near-
est Yamaha service center.
The power supply shuts down to
protect the speaker system.
MUTE indica-
tor lights.
There is a short at a speaker ter-
minal.
Locate and correct the cause of
the short.
The MUTE circuit operates to
protect the power transistors.