O power switch/power indicator (red), Protection indicator (red), Thermal fan indicator (red) – Yamaha PC4002M User Manual
Page 5: O btl indicator (green), Peak meters (pc 4002m only), Signal indicators (green) (pc4002 only), Clip indicators, Input attenuators, Knob locks (supplied)
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FRONT PANEL
Rack Handle
Rack Handle
Q KNOB LOCKS’
PC4002 ONLY
O POWER SWITCH/POWER INDICATOR (RED)
Push this switch to turn the power ON, and push it again
to turn the power OFF. The red power indicator will light
when power is supplied.
©PROTECTION INDICATOR (RED)
This indicator will illuminate under two sets of circum
stances: when power is first applied, a muting circuit is
in operation for about six seconds after power-up, to avoid
damage to speakers. This indicator will be lit at this time.
Additionally, if the protection circuitry is activated for any
reason (for instance, if a DC voltage exceeding ±2V ap
pears at the output terminal), the speaker outputs will be
shut off, and this indicator will go on. It will stay on for
as long as power is applied and the condition which caused
the protection circuit to activate still applies. Once the
condition has been remedied, the indicator will go off, and
normal operation will be resumed.
©THERMAL FAN INDICATOR (RED)
If the fans are operating at high speed (ie a heat-sink
temperature of 80°C has been attained), this indicator will
go on.
O BTL INDICATOR (GREEN)
This indicator will be lit if the BTL (mono bridging rtiode)
switch on the back panel has been set ON.
©PEAK METERS (PC 4002M ONLY)
These large illuminated meters give a peak reading of the
output level from the amplifier. The bulbs illuminating these
meters are replaceable without soldering from the front
panel. The meters' zero points may also be adjusted from
the front panel.
SIGNAL INDICATORS (GREEN) (PC4002 ONLY)
These signal indicators light when the output signal level
is 2V or more (in the frequency range 20Hz-20kHz) to
confirm the input signal.
©CLIP INDICATORS
These LED indicators light up when the output distortion
of the respective channel reaches a level of about 1 %.
© INPUT ATTENUATORS
These allow attenuation of the input signals in IdB cali
brations from 0-20dB, and in 2dB calibrations thereafter.
The controls are detented for a positive feel, and to help
with replicating settings.
© KNOB LOCKS (supplied)
Push these locks over the attenuation controls to prevent
accidental resetting of the levels. Pull them off again if you
need to reset the levels.