Yamaha T3n, T4n, T5n Filter Element Cleaning, Troubleshooting

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.)

Front ﬁlter grille

Troubleshooting

Filter element

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(s)	Possible Cause	Remedy	Protection Circuit

	There is a short at a speaker ter-	Locate and correct the cause of
	minal, ampliﬁer terminal, or	Locate and correct the cause of
	minal, ampliﬁer terminal, or	the short.
	wire.	the short.
CLIP indicator	wire.		The PC limiter circuit operates to

		Use a speaker system with an
lights.		Use a speaker system with an	protect the power transistors.
	The ampliﬁer load is excessive.	impedance of at least 2 ohms
	The ampliﬁer load is excessive.	(STEREO/PARALLEL mode) or
		(STEREO/PARALLEL mode) or
		4 ohms (BRIDGE mode).

		Check the ventilation slots and
TEMP indica-	The heat sink temperature has	clean the ﬁlter elements to pro-	The TEMP indicator lights up to
tor lights.	exceeded 85˚C.	vide better airﬂow around the	indicate temperature warning.
		ampliﬁer.

		Check the ampliﬁer ventilation
		conditions and take appropriate	The thermal protection circuit
	The heat sink temperature has	measures to improve the airﬂow	The thermal protection circuit
PROTEC-	The heat sink temperature has	measures to improve the airﬂow	operates to protect the power
	exceeded 85˚C.	around the ampliﬁer.	operates to protect the power
	exceeded 85˚C.	around the ampliﬁer.	transistors.
TION indica-		Also, clean the ﬁlter elements to	transistors.
TION indica-		Also, clean the ﬁlter elements to
tor lights.		ensure proper airﬂow.

	A DC voltage is detected at the	Consult your dealer or the near-	The power supply shuts down to
	ampliﬁer’s output.	est Yamaha service center.	protect the speaker system.

MUTE indica-	There is a short at a speaker ter-	Locate and correct the cause of	The MUTE circuit operates to
tor lights.	minal.	the short.	protect the power transistors.

T5n/T4n/T3n Owner’s Manual 11