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10
CONTROL UNIT
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When working with the product, be sure to turn the power off. Working with the power on may cause an elec-
tric shock or short circuit.
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Be careful not to damage the wires. Damaged wires may cause an electric shock, short circuit or present a
risk of
fi
re.
Do not touch any parts that are not speci
fi
ed in these directions. Touching unspeci
fi
ed locations may lead to
electric shock or cause short circuits.
This work should be performed by site maintenance personnel or other skilled professionals. Work performed
by non-technical personnel can cause a severe accident such as an electric shock.
Exercise due caution in performing soldering procedures. If soldering iron is handled carelessly, there could
be
fi
res or burns.
Proceed very carefully when heating thermal contraction tube. Careless operations can result in
fi
res or
burns.
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When fastening plastic parts, be careful not to tighten screws and nuts excessively. Otherwise parts may be
damaged, resulting in injuries from fragments, etc.
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Be careful not to get hand or
fi
nger caught when removing or attaching the parts.
Disconnection and connection of connectors will be performed within the narrow cabinet space. Take due
care not to scratch or otherwise injure yourself.
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Take care when carrying the removed Control Units. Such heavy lifting carries a risk of injury to back or shoul-
ders.
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After the volume has been replaced, be sure to set the volume value on the test mode calibration screen and
the input test screen and check variations in the volume value.
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After adjusting or replacing a microswitch, always check ON/OFF of the switch on the input test screen of the
test mode.
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Handle parts inside the Control Unit very carefully. Be especially careful to avoid damage, deformation or loss
of these parts. If any one of these parts is lost or defective, it can result in damages and/or faulty operations.
If the operability of the Control Unit is unsatisfactory, or if settings on the test mode calibration screen are ineffective, the problem could be a
defective mechanism, displacement of the position where volume or microswitch has been fastened, or malfunctioning of volume or microswitch.
Carry out the following procedure to replace Control Unit or microswitch. Also be sure to grease the mechanical components of the Control Unit
once every 3 months.
10-1 HOW TO REMOVE CONTROL UNIT
When changing the volume or microswitches in the Control Unit you must first remove the Control Unit. Performing these operations with the
Control Unit still attached is difficult and may damage parts or wires.
The following tools are needed for the following procedure.
- Phillips head screwdriver (for M6)
- Wrench or screwdriver for tamperproof screws (for M4)
- A 7 millimeter spanner, hexagonal screwdriver, or socket wrench
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