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1. Level Control
To prevent unauthorized operation of the level controls on the CPS3 and CPS4, they are provided with
screwed-on protective cover lids. When shipped from the factory, the detented potentiometers are set to
their clockwise limits. Thus, the input signal is not attenuated. In case matching the input levels is required,
you first have to detach (unscrew) the cover lids to gain access to the potentiometers.
2. POWER ON INDICATION
This LED lights up when the mains switch is pressed. If it does not light up, the unit is not connected to
the mains or the mains fuse has blown.
3. INPUT INDICATION
This LED lights up if a signal is present at the power amplifier input. The indicator does not light up when
the input controls are turned down completely.
4. OUTPUT INDICATION
This LED lights up if a signal is present at the power amplifier output. The indicator goes off when the
speaker line has shorted or a protective circuit has been activated thus indicating that there is no signal
at the speaker output terminals.
5. LIMIT
This LED lights up if the limiter has been activated and the power amplifier is being operated at the clip
level. If the LED flashes briefly, this is not a cause for concern. If this LED is lit permanently, the volume
should be reduced to avoid overload damages to the connected loudspeaker systems.
6. PROTECT
When this LED lights up during operation, one of the protection circuits against over-temperature,
overload, shorted outputs, radio frequency interference or DC faults has been triggered. The cause of the
error e.g. a shorted loudspeaker line must be remedied. In case of overheating, wait a little until the
amplifier switches back to operating mode itself.
7. POWER Switch
The unit is switched on via the power switch. The loudspeaker outputs are switched on via delayed relays
so that no startup transients are audible. A current limiter prevents startup peaks on the mains line and
prevents the mains fuse from blowing.
FRONT PANEL
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