B REG Power Supply
[1] Protection Circuit Process List
Item Purpose Detection Method Status of Equipment Warning Indication Remarks
B REG
power
supply
overheat
detection
Detects overheat of
transistor(s) in B REG power
supply circuit
Detects when posistor detection
temperature exceeds 120°C and
BTMP port becomes "H".
(IC2001 48pin)
Flashes "OVERHEAT"
indicator.
Shuts down at
continuation for more
than 3 seconds.
LED indicator continues
blinking.
"OVERHEAT" and 3
second flashing.
Blinks ICE blue LED
indicator.
Recoverable by power-on
B REG
power
supply
failure
detection
Detect abnormal voltage drop
when B REG transistor(s)
becomes failure
Detects output voltage of B REG
power cuicuit decreases below
38V and BERR port becomes "L".
(IC2001 47pin)
Shuts down
Blinks MCACC LED Unrecoverable
Amplifier Circuit
Item Purpose Detection Method Status of Equipment Warning Indication Remarks
Overheat
detection
Detects MOS FET
temperature of amplifier output
stage
Detects when TEMPERR PORT
becomes "L" in case of the
detecting temperature exceeds
95°C or rapid change by short
cuicuit of speaker terminals.
(IC2001 89pin)
Shuts down with FL
indication of "AMP
OVERHEAT".
LED indicator continues
blinking.
Indicates "AMP
OVERHEAT".
Blinks ICE blue LED
indicator.
Recoverable by power-on
Detects when MAXTEMP port
becomes below 3.3V at NTC
Thermistor detect circuit.
(IC2001 91pin)
Fan rotates below 3.3V.
DC
detection
Detects DC of amplifier output
(After LPF)
Detects when SP output exceeds
DC ± 7V and DCERR port
becomes "L". (IC2001 90pin)
Let MUTE on, Speater
Relay off and shuts down
3 seconds after to blink
MCACC LED.
Flashes "AMP
ERR"indicator.
Blinks MCACC LED
Let MUTE on, Speater
Relay off and shuts down
3 seconds after to blink
ICE blue indicator.
Flashes "AMP
ERR"indicator.
Blinks ICE blue LED
indicator.
In case of detecting DC
abnormality during normal
operation. Recoverable by
power-on after 1 minute.
In case of detecting DC
abnormality during
power-on sequence after
detecting DC.
Unrecoverable
Fan
abnormality
detection
Detects a Fan not rotating by
loose connector or Fan lock
when controling the Fan rotation
Detects when FANDET port
becomes "L". (IC2001 88pin)
Shuts down when
abnormality continues for
more than 3 seconds.
Flashes "FAN
STOP"indicator.
Blinks Digital Video
Scaler LED
Recoverable by power-on
Recoverable by power-on
Recoverable by power-on
Recoverable by power-on
Recoverable by power-on
Zobel
detection
Protects overcurrent by Zobel
Resistance when high power
output of higher frequency
continued
Detects OLERR port becomes "L".
(IC2001 17pin)
Shuts down
Shuts down
Blinks PHASE
CONTROL LED
Blinks PHASE
CONTROL LED
Shuts down
Blinks PHASE
CONTROL LED
Overcurrent
detection
Protects overcurrent of MOS
FET in output stage when
overcurrent flows at the output
stage
Detects OLERR port becomes "L".
(IC2001 17pin)
Low Voltage
detection
(Amplifier
power
supply)
Detects low voltage when
amplifier power supply voltage
(normally ± 64V) becomes
below ± 42V
Detects OLERR port becomes "L".
(IC2001 17pin)
AMP_Overload DET
Low
Voltagae
detection
(
Modulator
IC)
Detects low voltage of modulator
IC power supply (normally ± 5V)
becomes below ± 2 - 3V
No micro-computer detection
exists.
No micro-computer
control but modulator IC
stops by itself.
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