Controls And Functions; Front Panel; Protection Indicator; Clip Indicator - Yamaha KAX-2500 Owner's Manual

Controls and Functions

■ Front Panel

1 POWER switch and indicator
Press to toggle the power on or off. The POWER indicator
lights up green when the power is ON.
2 TEMP indicator
Lights up red if the heat sink temperature exceeds 85°C
(185°F).

3 PROTECTION indicator

Lights up red to indicate that protection is in effect. Specifi-
cally, lights up if the heat sink overheats, or if a DC voltage is
detected at the amplifier outputs. Also lights up for about three
seconds at time of power-on, as the amp gets ready to operate.
To provide protection, the unit will not output any sound from
the speakers while this indicator is lit up. When start-up is
completed or the problem is corrected, the indicator goes off
and normal operation resumes.

4 CLIP indicator

Lights up red when the output signal distortion on the corre-
sponding channel rises above 1%—indicating that "clipping"
has occurred because the signal level is too high.
5 SIGNAL indicator
Lights up green when the corresponding channel
exceeds 2 Vrms (equivalent to 1/2 W into an 8 Ω load, or 1 W
into a 4 Ω load).
6 Volume control knobs
Each control knob adjusts the volume of the corresponding
channel, in 31 steps from –∞ dB to 0 dB.
NOTE:
If you wish to lock in the knob settings, you can fasten the sup-
plied security cover over the knobs so that the settings will not
be disturbed.
6
2
8 1 3
'
s output level
4
5 7 6
How to install the security cover
(1) Use the supplied hex wrench to remove the four attach-
ment screws from the amplifier.
(2) Adjust the security cover to the position of screw holes.
Fasten it into place using the same screws.
7
indicator
Lights up yellow if the YS PROCESSING switch on the rear
panel is set ON. (See page 7.)
8 Air intakes
The amplifier uses forced-air cooling. The cooling fans draw
air in from the front and exhaust it through the rear. Please be
sure that you do not block the air intakes or exhaust vents.
NOTE:
The fans do not come on at initial power-on, but will switch on
automatically when the temperature of the heat sink rises above
50°C (122°F). The fan speed will then vary automatically as
the temperature changes.
8