JBL 6230 Instruction Manual page 20

IMPORTANT;
DO NOT POKE YOUR FINGERS OR METAL TOOLS INTO THE
AMPLIFIER WHEN THE KNOBS ARE OFF.
THERE
IS
THE POSSIBILITY OF
SEVERE SHOCK HAZARD DUE TO THE HIGH VOLTAGE/HIGH CURRENT DC USED
TO POWER THIS DEVICE.
THE AMPLIFIER SHOULD NOT
BE
OPERATED
WITHOUT EITHER THE KNOBS OR SECURITY COVERS
IN
PLACE.
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