9
results
to
blocking
and
high
‐
current.
3
On/Off
Anti
‐
shock
Circuit
‐
The
amplifier
can
not
start
and
there
is
shock
sound
when
shutdown:
mainly
check
the
device
of
this
circuit,
see
whether
the
detached
photocoupler
OP1/817,
Q37,
Q38
is
damaged
or
not;
4
Fan
Speed
Control
Circuit
‐
Fans
do
not
work.
‐
Fast
rotating.
‐
It
is
easily
to
go
into
over
‐
heat
protection
if
the
fans
don’t
speed
up
after
the
module
temperature
increasing.
5
Rectifier
Output
Circuit
‐
Power
supply
protection
happened
while
switch
on.
‐
Power
amplifier
protection
happened
while
switch
on.
‐
Serious
distortion
of
sound.
‐
No
±
15V
voltage.
‐
No
+24
V
output,
results
to
all
the
indicator
led
on
the
panel
do
not
shine
(start
‐
up
unavailable)
Repairing
Guide:
1)
When
repairing
the
SMPS
board,
please
cut
the
DC/300V
fuse,
series
connect
one
100W
‐
200W
lamp
to
start
the
machine,
preventing
the
damage
of
related
device
when
repairing.
2)
When
the
SMPS
can
not
be
started,
repeats
the
protection
and
restart,
please
disconnect
+
VCC,
‐
VCC
then
try
to
start,
if
it
is
normal,
it
means
short
‐
circuit
in
amplified
part,
check
the
amplifier
circuit,
otherwise
it
is
the
failure
of
SMPS.
3)
Power
supply
protection
means
‐
all
the
indicator
lights
on
the
panel
lit
and
then
immediately
black
out.
Summary of Contents for HP-X series
Page 1: ...1 Service Manual HPX Series Applicable Models HPX900 HPX1200 HPX2400 HPX2800...
Page 10: ...10 6 HPX900 Malfunction Analysis on Amplified Part 6 1 Circuit Diagram of Amplifier...
Page 16: ...16 10 HPX1200 Malfunction Analysis on Amplified Part 10 1 Circuit Diagram of Amplifier...
Page 18: ...18 11 HPX2400 2800 Malfunction Analysis on SMPS 11 1 Circuit Diagram of SMPS...
Page 20: ...20 12 HPX2400 2800 Malfunction Analysis on Amplified Part 12 1 Circuit Diagram of Amplifier...
