15
KAX-2500
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)
Troubleshooting
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.
KAX-3500, KAX-2500
KAX-5000
Line Current (A)
Power (W)
Thermal Dissipation
100/120V
230/240V
In
Out
Dissipated
Btu/h
kcal/h
standby
0.08
0.04
5
0
5
17
4
idle
1.0
0.5
25
0
25
85
22
1/8 power
8
Ω
/ch
2.4
1.3
174
69
105
358
90
4
Ω
/ch
3.6
2.0
271
98
173
592
149
1/3 power
8
Ω
/ch
5.6
3.1
421
183
238
811
204
4
Ω
/ch
8.8
4.8
657
260
397
1350
341
Indicator(s)
Possible Cause
Remedy
Protection Circuit
CLIP indicator lights.
There is a short at a speaker
terminal, 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 4
Ω
(STEREO/PARALLEL mode) or
8
Ω
(BRIDGE mode).
TEMP indicator lights.
The heat sink temperature has
exceeded 85°C (185°F).
Check the ventilation slots, and
provide better airflow around
the amplifier.
The TEMP indicator lights up
to indicate temperature
warning.
PROTECTION indicator lights.
The heat sink temperature has
exceeded 95°C (203°F).
Check the amplifier ventilation
conditions and take appropriate
measures to improve the
airflow around the amplifier.
The thermal protection circuit
operates to protect the power
transistors.
Indicator(s)
Possible Cause
Remedy
Protection Circuit
PROTECTION indicator lights.
A DC voltage of ±2 V or greater
was generated in the power
amplifier’s output circuit.
Consult your dealer or the
nearest Yamaha service center.
The relay operates to protect
the speaker system.
Indicator(s)
Possible Cause
Remedy
Protection Circuit
Power has been shut down. (All indicators
are off.)
A DC voltage of ± 2 V or
greater was generated in the
power amplifier’s output circuit.
Consult your dealer or the
nearest Yamaha service center.
The protection circuitry shut off
the power to protect the
speaker system.
