PA-20HM&20HB
B
LOCK
DIAGRAM
PA-20HM&20HB
BLOCK
DIAGRAM
PUBLIC ADDRESS
AMPLIFIER
13
BLOCK DIAGRAM
IMPORTANT SAFETY INSTRUCTIONS
The symbol is used to indicate that
some hazardous live terminals are
involved within this apparatus, even
under the normal operating conditions.
The symbol is used in the
service
documentation to indicate that specific
component shall be only replaced by
the component specified in that
Documentation for safety reasons.
Protective grounding terminal.
Alternating current /voltage.
ON: Denotes the apparatus turns on.
OFF: Denotes the apparatus turns off, bec-
ause of using the single pole switch, be sure
to unplug the AC power to prevent any
electric shock before you proceed your
service.
WARNING
: Describes precautions that
should be observed to prevent the danger
of injury or death to the user.
CAUTION
: Describes precautions that
should be observed to prevent danger of the
apparatus.
voltage of the power supply before turning
ON the apparatus.
Unplug this apparatus during lightning
storms or when unused for long periods
of time.
External Connection
The external wiring connected to the output
hazardous live terminals requires installation
by an instructed person, or the use of ready-
made leads or cords.
Do not Remove any Cover
There are maybe some areas with high
voltages inside, to reduce the risk of electric
shock, do not remove any cover if the power
supply is connected.
The cover should be removed by the qualified
personnel only.
No user serviceable parts inside.
Fuse
To prevent a fire,make sure to use fuses
with specified standard (current,voltage,
type). Do not use a different fuse or short
circuit the fuse holder.
Before replacing the fuse,turn OFF the
apparatus and disconnected he power
source.
Protective Grounding
Make sure to connect the protective
grounding to prevent any electric shock
before turning ON the apparatus.
Never cut off the internal or external pro-
tective grounding wire or disconnect the
wiring of protective grounding terminal.
Operating Conditions
Hazardous live terminal .
Disposing of this product should
not be placed in municipal waste
and should be separate collection.
Power Supply
Ensure the source voltage matches the
WARNING
This apparatus shall not be exposed to
dripping or splashing and that no objects
filled with liquids,such as vases, shall be
placed on this apparatus.
2
Direct Current/voltage
If applicable:This symbol means the
equipment is a Class ll or double-
insulated electrical appliance. It has
benn designed in such a way that it
does not require a safety connection
to electrical earth.
