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the speaker cord should be connected to the LEFT +
(BRIDGED +) terminal and the - lead should be
connected to the RIGHT + (BRIDGED -) terminal
Note: The potential of the BRIDGED - terminal of this
unit is not the same as the earth potential Connect the
speaker system directly to this unit using the speaker
cords: never use the speaker select unit or something
similar. Secure the speaker cord so that the lead of the
cord does not touch the other terminal or the metal part
of this unit.
3. Using two cables with phono connectors, connect a
preamplifier to two RB-870BXS Connect the OUTPUT L
jack of the preamplifier to the INPUT LEFT jack of the
RB-870BX for left channel and the OUTPUT R jack of the
preamplifier to the INPUT LEFT jack of the RB-870BX for
right channel. The INPUT RIGHT jacks are not to be used
in the bridged connection.
HOW TO CONNECT THE SPEAKER CORDS TO THE
SPEAKERS TERMINALS
Strip the cord end and twist leads firmly, then connect it to
the SPEAKERS terminal. The SPEAKERS terminals of this
unit are screw type Turn the screw counterclockwise and
insert the cord end. Then tighten the screw firmly by turning
clockwise so that the speaker cord cannot be pulled out
accidentally.
SWITCHES AND CONTROLS
(1) Power Button
Depress this button to turn on the power in the unit. Press
the button a second time to release it and to cut off the power.
(2) Power Indicator
Glows when power is turned on with the power button
(3) Protection Indicator
The indicator normally lights for several seconds upon turn¬
ing on the power. When the indicator goes off. it means the
unit is in the normal operating state.
The indicator glows when abnormally high temperature is built
up inside the unit In such a case, the indicator will remain
on until the temperature inside the unit drops to a normal level.
When the indicator goes off. it indicates the unit has returned
to the normal operating state.
(4) Bridged Mono Indicator
Lights up when using this unit as a monaural amplifier by
making a bridge connection.
OPERATION
• Before commencing operation, check to see if all con¬
nections are properly made.
• Before turning on the power in the unit, always be sure
to turn down the preamplifier volume control to minimum.
1. Turn on the preamplifier.
2. Turn on the RB-870BX.
3. Reproduce a desired source, and raise the volume level
on the preamplifier.
HUM AND NOISE
In any high fidelity installation, hum may be caused by the
interconnection of a turntable, tuner and amplifier, and speak¬
ers as the result of wiring, different grounding or locations
of components.
If hum is experienced with your unit, disconnect everything
but the speakers from the unit. Plug in the turntable and if
hum or howling appears, move the turntable away from the
speakers as much as possible.
Note hum may also be induced by defective cable connec¬
tions or by running the cables too close to strong AC field.
When your unit picks up noise during the reception of broad¬
casts, causes are mostly due to external objects such as
fluorescent lamps and house appliances using motor or ther¬
mostat, or others that may induce the noise.
Either relocating the unit away from the noise sources or using
an improved outdoor antenna may readily solve fhe problem.
In the event you cannot find the cause, consult your dealer
or a qualified electrician.
3
PROTECTION CIRCUIT
The RB-870BX incorporates thermal protector to prevent
accident or damage. If for some reason the protection cir¬
cuit is activated, there will be a sudden cut-off of sound from
the speakers, and the protection indicator will light up.
If no sound is produced, the reason may be due to the func¬
tioning of the protection circuit. First, turn off the power and
disconnect the plug from the electrical outlet. Then locate
and remedy the cause of the trouble. When the thermal pro¬
tector is activated, the unit will start functioning automatical¬
ly after the temperature is lowered again.
If the protection circuit is activated again despite taking the
above action, cut off the power supply from your entire audio
system and consult your dealer or a qualified electrician.
Note:
The protection circuit will normally operate to prevent
a popping noise from being generated upon turning on the
power. No sound is produced for several seconds after
turn-on.
VOLTAGE SELECTION
Not
available
for U.K.,
Canada and Scandinavia
The unit is a variable voltage equipment that can run on 120V,
220V or 240V power supply. Your unit should already be
preset at the proper voltage for use in your area However,
if you move to an area where the power supply voltage is
different, consult your dealer.
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