Alpine 3502 Code 02 Bridgeable Power Amplifier Service Manual
User Manual: 3502
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Page Count: 24
I"ODEL
d
50
(/13316
SYI'IPTQM
No
sound,
no
turn
on.
One
channel
out.
No
rear
output.
PROBLEt1
Defective
Q4£1B
and/or
0487.
Cold
soldering
at
the
point
...
here
L4/111
joins
with
the
collector
of
Q40B.
Missing
8+
re.ote
trigger.
voltage
for
DIN
cable.
Defective
IC481
and/or
Q483.
Cold
soldering
on
9403.
~ectiYe
fader
control.
REPAIR
Replace.
Resolder
•
Supply
the
lIlissing
voltage.
Replace.
Resolder.
Repl.ce.
~
d
Sb5J5£12
LED
on
the
input
level
does
not
light.
Blowing
fuses.
No
turn
on.
Lkli t
tur-ns
on
but
no
sound.
Popping
Noise.
Left
channel
distorted.
One
channel
out.
High
pitch
noise.
fil
o
",
\.l~,-r
o
A~1il~
High
pitch
noise~a~d
high
current
draM.
The
system
is
off.
but
the
unit
is
drawing
current
(about
20/11
lilA).
Defective
IC4/119
and/or
418.
I
Replace.
Shorted
OB/1II,
OB82.
9B/1I3, I
Replace
as
necessary.
ge.4,
DB05,
D80b,
QSI9,
Q528,
0521,
9522,
and/or
TB01.
Burnt
out
foil
path
of
I
Repair.
switch
S801.
Defectiv.
~l,
QB82,
ga83,
.
Replace
as
necessary.
9B84,
9B18,
9BII,
Q812,
Q813,
and/or
ID801.
Missing
8+
re.cte
voltage
I
Supply
the
8+
for
the
remote
voltage.
for
DIN
input
jack.
Faulty
OB/1I9.
IReplace
as
necessary.
Leaky
C811.
~ective
RLB81
(relay).
Leaky
CBII.
I
Replace.
Defective
Q519
and/or
Q521.
I
Replace.
Defective
ICS/1lI. I
Replace.
Defective
CBt8.
IReplace.
Foil
path
at
C805
open
or
IResolder
or
replace
as
necessary.
CB05
defecti
.....
Shorted
Q81..
IReplace.
Note:
In
early
3582'5,
the
base
resistors
for
transistors
gael,
B.2,
B/1I3
and
884
had
the
value
of
~.47
ohllls.
In
the
later
versions,
that
resistor
...
as
~anged
to
4.7
ohms.
Please.
do
the
same
every
time
)'OU
work
on--cme
of
these
earl
y
uni
ts.
Thi
s
appl
i
es
to
Code
/111
units
only.
