31
SC-71
5
6
7
8
5
6
7
8
A
B
C
D
E
F
1) No
S
ound
No
Yes
No
No
Yes
Yes
No
No
Yes
Yes
NOTE
: Wiring number listed is the ex
a
mple of Front L-ch
2) Diagno
s
i
s
Flow Chart from Error
S
ymptom
F
a
ilure loc
a
ting method from error symptom is
a
v
a
il
a
ble
a
s di
a
gnosis
a
fter product shutdown.
Di
a
gnosis Flow Ch
a
rt from error symptom due to Amplifier
S
ection is shown here.
C
a
use of being BERR
When B-Power
S
upply Volt
a
ge exceeds + 75 V
No
When B-Power
S
upply Volt
a
ge f
a
lls below + 20 V
Yes
C
a
use of being OL
No
At Over Current Detected (Not worked with no-lo
a
d)
At Driver IC not Oscill
a
ted
At ZOBEL Detection Circuit Activ
a
ted
Yes
C
a
use of being DC
When DC 7V or
a
bove is output in Audio Output Line
C
a
use of being TEMPERR
When MO
S
FET Temper
a
ture exceeds
a
pprox. 95 degrees
When MO
S
FET temper
a
ture is suddenly incre
a
sed
S
horted MO
S
FET (Q4101, Q4102)
F
a
ilure BERR Detection Circuit
(
a
round Q4022, Q4024)
Check Connector Conductivity
Oscill
a
tion
W
a
veform on Driver IC
(IC4101) Output (1
3
pin) seen
just in
a
moment
a
t rest
a
rting?
P
a
rts F
a
ilure
a
fter AMPLPF
(L4100, C4101)
F
a
ilure in MO
S
FET (Q4101, Q4102)
Check Power
S
upply on
Temper
a
ture Detection Circuit
(
a
round R41
8
1
a
nd IC 4204)
Perform imped
a
nce check on
Audio Output Line vs. Power
S
upply
F
a
ilure
a
round Driver ->
Repl
a
ce Driver IC
F
a
ilure
a
round ZOBEL Detection
Circuit (Q4101, etc)
Power
Distribution
S
t
a
tus
Any
S
witching
Residu
a
l W
a
veform existed
in
S
pe
a
ker Output* ?
(
S
ine w
a
ve = Approx.
450 KHz, 0.7V rms)
Audio
S
ign
a
l Input
Check how f
a
r the
sign
a
l is p
a
ssing
MUTE cle
a
red ?
Check MUTE Control
volt
a
ge (Q4114 B
a
se)
V = -12V (Norm
a
lly)
Go to 2) Di
a
gnosis Flow Ch
a
rt
from Error
S
ymptom if immedi
a
te
shut down h
a
ppens by the
Protection Circuit.
Check LPF COIL Conductivity
(L4100)
Check e
a
ch Power
S
upply of
Driver IC (IC4101)
Check Rel
a
y (RY4100) is ON
Check MUTE Control Line
S
ign
a
l exists just
before Driver IC (IC4101) ?
Check the four block A
SS
Y of
D-AMP_
SS
A
SS
Y
F
a
ilure Driver IC (IC4101)
Abnorm
a
lity
Detection on
AMP Power
Volt
a
ge (BERR)
Over Current
Detection (OL)
DC Detection
TEMPERR
Approx. DC 2V
exists in
S
pe
a
ker Output ?
Check Volt
a
ge of Driver IC
C
S
D Port (2pin)
DIGITAL AMP BLOCK FLOWCHART
(W
a
veform 1
a
nd 2)*
* : Refer to 10.27 D-AMP_
SS
A
SS
Y (2/5)
There is
a
problem
in Conduction of Power
S
upply Connector* ?
*: (CN4001, CN4002,
CN400
3
, CN4004)
*
Prec
a
utions for checking the spe
a
ker output
For the ch
a
nnel shown below, positive
a
nd neg
a
tive of
S
P termin
a
l
a
re inverted.
surround ch : The bl
a
ck termin
a
l is HOT
a
nd the red termin
a
l is ground.
