Warranty; Safety Symbols - JBL ARC SUB 8 Service Manual

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ARC SUB 8
Powered Subwoofer

WARRANTY

IMPORTANT SERVICE NOTES: When testing the ARC
Series amplifier, a load must always be connected to the
output terminals, whether the woofer, or a 4 to 8 ohm resis-
tive load.
All AC powered test instruments (meters, oscilloscopes,
etc.) must have a floating ground, i.e. be connected to an
isolation transformer.
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