AC mains fuses are located on the back panel of the amplifier. These fuses will not blow unless the amplifier is
asked to produce more power than its design allows for a prolonged period or to prevent excessive current draw,
which could damage internal components during a fault condition.
The amplifier has been designed to operate under virtually all conditions. Even momentary short-circuiting of
the output (speaker) connections will not ordinarily damage the output circuitry (although it will activate internal
protection circuitry and cause one or more of the front-panel LED indicators to be extinguished until the circuit
To remove the fuse, turn off the power switch and disconnect the power plug from the AC mains. Unscrew the
fuse holder cap and remove the fuse; install the new fuse and secure the holder cap; and reconnect the AC mains.
If after replacing the fuse the unit is inoperative, service is required; contact your JBL Synthesis dealer.
WARNING: Always unplug the amplifier from the AC mains before removing any fuse.
IMPORTANT: Never install a fuse that has a higher rating than that specified on the back panel of the
amplifier or in the owner's manual.
If you are using the S7165/S5165/S820 amplifier as part of a JBL Synthesis system, it is necessary to use these
jacks to interconnect to other system components so that Power On/Off can be transmitted from one unit to the
next, starting at the surround processor, through all amplifiers. Follow the connection diagrams on the following
pages for detailed information regarding these connections. Make connections to these jacks only as shown in the
diagrams. If these jacks are used in any other manner, e.g., to control electric screens, the unit can be damaged
and the warranty will be void. For specific electrical information on these jacks, contact JBL Synthesis Customer
Service at 516.594.0300 (USA only).
Do not plug anything into these jacks if you're not using the S7165/S5165/S820 with a JBL Synthesis system.
Your S7165/S5165/S820 is shipped with an IEC-type removable power cord that mates with the AC inlet on the rear
panel. To ensure proper operation, use the supplied power cord. This amplifier is NOT a multivoltage unit; using
a power cord that is not compatible with the correct voltage of the model for your country will void the warranty.
WARNING: This amplifier must be connected to an AC outlet with a protective earthing connection.
The S7165/S5165/S820 amplifier is provided with a chassis ground connection terminal, which is commonly used
to provide a common audio ground point to ensure that all grounds are at the same potential. This can be useful to
provide a single ground path for each audio component in the system, and should be used if experiencing a low-level
hum or buzz, which is normally caused by a voltage potential difference between two points in an audio ground circuit.
If you are using the S820 as a stereo power amplifier, connect the signal output(s) from the system equalizer or
surround processor to these jacks and set the Stereo/Mono Switch
the S820 in the bridged mode, connect the signal output from the equalizer to the Ch. 1 jack only, and put the
in the Mono position.
to the Stereo position. If you are using