Troubleshooting - Yamaha KAX-2500 Owner's Manual

KAX-2500
standby
idle
8Ω/ch
1/8 power
4Ω/ch
8Ω/ch
1/3 power
4Ω/ch
1/8 power is typical of program material with occasional clipping. Refer to these figures for most applications.
1/3 power represents program material with extremely heavy clipping.
Test signal: Pink Noise, bandwidth limited from 22Hz to 22kHz
1W = 0.860kcal/h, 1BTU = 0.252kcal
Note that Line Voltage [V] x Line Current [A] = [VA], not equals to [W].
Inrush current
KAX-5000: 11A (100V), 13A (120V), 25A (240V)
KAX-3500: 71A (100V), 87A (120V), 66A (240V)
KAX-2500: 103A (100V), 150A (120V), 68A (240V)
The following table lists the main causes of abnormal operation and the corrective measures required, as well as the protective circuit opera-
tion in each case.
Indicator(s)
CLIP indicator lights.
TEMP indicator lights.
PROTECTION indicator lights.
KAX-3500, KAX-2500
Indicator(s)
PROTECTION indicator lights.
KAX-5000
Indicator(s)
Power has been shut down. (All indicators
are off.)
Line Current (A)
100/120V 230/240V
0.08 0.04
1.0 0.5
2.4 1.3
3.6 2.0
5.6 3.1
8.8 4.8

Troubleshooting

Possible Cause
There is a short at a speaker
terminal, amplifier terminal, or
wire.
The amplifier load is excessive.
The heat sink temperature has
exceeded 85°C (185°F).
The heat sink temperature has
exceeded 95°C (203°F).
Possible Cause
A DC voltage of ±2 V or greater
was generated in the power
amplifier's output circuit.
Possible Cause
A DC voltage of ± 2 V or
greater was generated in the
power amplifier's output circuit.
Power (W)
In Out Dissipated
5 0
25 0
174 69
271 98
421 183
657 260
Remedy
Locate and correct the cause of
the short.
Use a speaker system with an
impedance of at least 4 Ω
(STEREO/PARALLEL mode) or
8 Ω (BRIDGE mode).
Check the ventilation slots, and
provide better airflow around
the amplifier.
Check the amplifier ventilation
conditions and take appropriate
measures to improve the
airflow around the amplifier.
Remedy
Consult your dealer or the
nearest Yamaha service center.
Remedy
Consult your dealer or the
nearest Yamaha service center.
Thermal Dissipation
Btu/h kcal/h
5 17
25 85
105 358
173 592
238 811
397 1350
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.
Protection Circuit
The relay operates to protect
the speaker system.
Protection Circuit
The protection circuitry shut off
the power to protect the
speaker system.
4
22
90
149
204
341
15