OPERATION
Turning On
The Amp
First Time: Before turning on the power switch to the JF2000
forthefirst time, double-check all speaker and input connec-
tions and turn the input level controls all the way down (fully
counter-clockwise). Turn on your source equipment (pre-
amp, CD player, etc.) Turn the power switch on and adjust
the input controls so that the left and right channel LEDs light
up green at a low preamp volume control position.
Normal Operation: As with any high-powered amplifier, it is
best to turn on the amplifier AFTER all other equipment is on,
and turn it off BEFORE any other equipement. This prevents
any turn-on or turn-off transients from other equipment
damaging your speakers.
LED DISPLAYS
Channel Status
LEDs
From left to right the front panel LEDs indicate: Left Channel
Status, Right Channel Status, and Power Status.
The Channel Status LEDs indicate the condition of the Left
and Right channel outputs. They will turn on GREEN to
indicate a signal output of over about 200 Milliwatts. They will
switch to RED to indicate distortion over about 0.5% THD.
The Power Status LED will turn on GREEN to indicate power
on. In case of overheating, it will switch to RED and the
amplifier will turn off until it cools down.
The channel status LEDs can show three indications:
OFF indicates no signal or a signal level under about 200
Milliwatts (a very quiet level with most speakers).
GREEN indicates a signal over about 200 Milliwatts and very
low distortion (under 0.5% for most conditions); that is,
normal operation.
RED indicates distortion in the output signal for any reason:
blown speaker fuse, shorted speakers, excessive speaker
load, or any other reason.
