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41
SC-57
5
6
7
8
5
6
7
8
A
B
C
D
E
F
1) No Sound
No
Yes
No
No
Yes
Yes
No
No
Yes
Yes
NOTE : Wiring number listed is the example of Front L-ch
2) Diagnosis Flow Chart from Error Symptom
Failure locating method from error symptom is available as diagnosis after product shutdown.
Diagnosis Flow Chart from error symptom due to Amplifier Section is shown here.
Cause of being BERR
When B-Power Supply Voltage exceeds + 75 V
No
When B-Power Supply Voltage falls below + 20 V
Yes
Cause of being OL
No
At Over Current Detected (Not worked with no-load)
At Driver IC not Oscillated
At ZOBEL Detection Circuit Activated
Yes
Cause of being DC
When DC 7V or above is output in Audio Output Line
Cause of being TEMPERR
When MOSFET Temperature exceeds approx. 95 degrees
When MOSFET temperature is suddenly increased
Shorted MOSFET (Q4101, Q4102)
Failure BERR Detection Circuit
(around Q4022, Q4024)
Check Connector Conductivity
Oscillation
Waveform on Driver IC
(IC4101) Output (13pin) seen
just in a moment
at restarting?
Parts Failure after AMPLPF
(L4100, C4101)
Failure in MOSFET (Q4101, Q4102)
Check Power Supply on
Temperature Detection Circuit
(around R4181 and IC 4204)
Perform impedance check on
Audio Output Line vs. Power Supply
Failure around Driver ->
Replace Driver IC
Failure around ZOBEL Detection
Circuit (Q4101, etc)
Power
Distribution
Status
Any Switching
Residual Waveform existed
in Speaker Output ?
(Sine wave = Approx.
450 KHz, 0.7V rms)
Audio Signal Input
Check how far the
signal is passing
MUTE cleared ?
Check MUTE Control
voltage (Q4100 Base)
V = -5V (Normally)
Go to 2) Diagnosis Flow Chart
from Error Symptom if immediate
shut down happens by the
Protection Circuit.
Check LPF COIL Conductivity
(L4100)
Check each Power Supply of
Driver IC (IC4101)
Check Relay (RY4100) is ON
Check MUTE Control Line
Signal exists just
before Driver IC (IC4101) ?
Check Power Supply Voltage for
Op-Amp ICs (IC4202 and IC4100)
Failure Driver IC (IC4101)
Abnormality
Detection on
AMP Power
Voltage (BERR)
Over Current
Detection (OL)
DC Detection
TEMPERR
Approx. DC 2V
exists in
Speaker Output ?
Check Voltage of Driver IC
CSD Port (2pin)
DIGITAL AMP BLOCK FLOWCHART
(Waveform 1 and 2)*
* : Refer to 10.29 IR POWER
AMP ASSY (2/6).
There is a problem
in Conduction of Power
Supply Connector* ?
*: (CN4001, CN4002,
CN4003, CN4004)
Содержание SC-LX75
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