Page 9
PA2000 Series | Power Amplifier
INPUT SIGNAL
(Balanced)
PARALLEL OUT
TO NEXT AMP
INCOMING AC
220-240V
24V DC BACK UP
INPUT TERMINAL
PARALLEL TO NEXT
AMPLIFIER
AC (5A) FUSE
POWER SWITCH
DC FUSE
BLOCKING
DIODE
STEP DOWN
TRANSFORMER
RECTIFIER
30V DC
STEP UP
TRANSFORMER
100V OUTPUT
70 V
25 V
COMMON
BAL-UNBAL
CONVERSION
CIRCUIT
GROUND LIFT
SWITCH
LEVEL
ADJUST
PROTECTION
CIRCUIT
AMPLIFICATION
CIRCUIT
THERMISTOR - Q POINT
THERMISTOR - FAN SPEED / PROTECTION
THERMAL PROTECT TEMP : 86 C
DUAL SPEED FAN
NORMAL : BELOW 45 C
BOOST : ABOVE 45 C
Note : Heat at heat sink
The above block diagram illustrates the general block construction of the power amplifier. Detailed circuit can be obtained
from our service department.
Earth Loop
To avoid hum or noise to the output, the chassis earth and the electrical earth should be separated.
this can be done by switching the Ground Lift Switch. Refer Page 5.
Speaker
Connections
Total speakers connected to the terminals should not exceed the rating specified. Connecting
speakers to 100V line shall have load equivalent to the sum of all the rating of the speakers.
Connecting the same loudspeakers to the 70V line shall only consume half of the power, thereby,
twice the number of speakers of the said rating can be connected to 70V line terminal.
Speaker
Polarity
Speakers with '+' terminal should be connected to 100V line output. Distortion sound clarity can occur
when anti phase connections are made and is apparent when they are installed closed to each other.
AC FUSE
Block Diagram
Notes
