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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.
Indicator(s)
Possible Cause
There is a short at a speaker ter-
minal, amplifier terminal, or
wire.
CLIP indicator
lights.
The amplifier load is excessive.
TEMP indica-
The heat sink temperature has
tor lights.
exceeded 85˚C.
The heat sink temperature has
PROTEC-
exceeded 85˚C.
TION indica-
tor lights.
A DC voltage is detected at the
amplifier's output.
MUTE indica-
There is a short at a speaker ter-
tor lights.
minal.
Front filter grille
Remedy
Locate and correct the cause of
the short.
Use a speaker system with an
impedance of at least 2 ohms
(STEREO/PARALLEL mode) or
4 ohms (BRIDGE mode).
Check the ventilation slots and
clean the filter elements to pro-
vide better airflow around the
amplifier.
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.
Consult your dealer or the near-
est Yamaha service center.
Locate and correct the cause of
the short.
Filter element
Protection Circuit
The PC limiter circuit operates to
protect the power transistors.
The TEMP indicator lights up to
indicate temperature warning.
The thermal protection circuit
operates to protect the power
transistors.
The power supply shuts down to
protect the speaker system.
The MUTE circuit operates to
protect the power transistors.
T5n/T4n/T3n Owner's Manual
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