
no or lower
no or lower
no or lower
no or lower
SP150/230 Trouble Shooting Flow Chart
NO
±VCC
(
±2V
)
±19V
(
±1V
)
±12V
(
±1V
)
check R82.R83
check
U4.Q1.U1.BD3.T1
①
Check DC
voltages
②
NO
POWER
ON
OK
±10V
(
±1V
)
check
Q8.Q21.Q22.Q23.R80.R81
check U4
, U5
,
and
parts
related to them
emphasis
is to check capacitors related
with U4.U5
③
②
NO
Test
Frequency
OK
OK
④
①
check
filter
pcb
:
U5.U6.U7.VR1.VR2
,
and
parts
related
to
them
emphasis
is
to
check
feedback
resistor
and
capacitor of OPAMP
IC.
②
check
post
-
stage
: pin8,9,16,21 of
U2
,
and
parts related to them
emphasis
is
to
check
if
U
2
is
defective
,
emphasis
is
to
check
if
is
Q1.C3.D5.D6.D7
defective
,
and
check
if
R26.R25.C57.C54 is defective
NO
Test
Sensitivity
OK
check
U6-A
and
parts
related
to
it
,
check
-12V
voltage
(
±1V)
NO
NO
check
±VCC voltage
⑤
Test
limiter
circuit
OK
check
if
U2
is
defective
test method pls
refer to above
items
check
limiter
circuit
emphasis
is to check if U2.C64.C65
is
defective
NO
⑥
test
power
and
distortion
OK
⑦
①
check
U2 and C64.C65.L5.L7.C53.C265
related
to
it,
see if any part got defective.
②
check
all
filter
capacitors of DC voltage points
check
C3(filter capacitor to GND)
NO
test idle noise
Test DC
voltages
Response
JBL
150P / 230V Service Manual
Page 10 of 50
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