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The front panel of ISA series amplifiers is tailored for installed
sound. The power switch is the only front panel control; gain
controls are located on the rear panel to minimize control
tampering. LED indicators are provided for power, input signal
and to warn of clipping.
If the POWER LED fails to illuminate when the switch is in the ON position:
The power switch is a rocker-type switch. To turn the amplifier
on, push in on the top portion of the switch. To turn the amplifier
off, push in on the bottom portion of the switch.
The green power LED should light up when the switch is in the
on position.
When the power is switched off, the LED may takes several
seconds to go out; this is normal.
FEATURES & SETUP- POWER SWITCH, COOLING AIR VENTS
Rear panel circuit breaker:
Tripped or open position;
press to reset.
Rear panel circuit breaker:
Normal operating position
If the circuit breaker opens repeatedly with nothing
connected to the amplifier and it is connected to the
proper AC source as labeled on the rear panel serial
number label, then the amplifier requires servicing
.
Keep the inlet and exhaust air vents clear of any obstructions. Insure
that the air exhausted from the vents has an exit from the equipment
enclosure.
Equipment enclosures with insufficient air flow will cause amplifier
overheating. Enclosures must allow fresh air to enter and hot air to
exit.
If dust builds up, clogging the vents, use a soft brush and a vacuum
cleaner to remove the dust. Use the brush to loosen the dust while the
vacuum is used to pull the dust away from the amplifier.
1- Check the AC cord and insure that both ends are fully inserted into their receptacles. If the power LED
still fails to illuminate,
2- Check the AC outlet for voltage with a circuit tester or known good device (lamp, etc.).
3- Check the AC circuit breaker on the rear panel of the amplifier. The illustration at the right shows the
circuit breaker in its normal (operating) position and its tripped position (amplifier AC power turned off by
protective circuit breaker).