Alpine 3502 Code 02 Bridgeable Power Amplifier Service Manual

User Manual: 3502

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Sb5J5£12

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d 50 (/13316

I"ODEL

Defective Q519 and/or Q521.
Defective ICS/1lI.

Left channel distorted.

One channel out.

The system is off. but the
unit is drawing current
(about 20/11 lilA).

High pitch noise~a~d high
current draM.

High pitch noise. fil o",

Shorted Q81..

Foil path at C805 open or
CB05 defecti .....

Defective CBt8.

Leaky CBII.

Popping Noise.

\.l~,-r
o A~1il~­

Faulty OB/1I9.
Leaky C811.
~ective RLB81

Lkli t tur-ns on but no sound.
(relay).

Burnt out foil path of
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.

No turn on.

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.

IReplace.

IResolder or replace as necessary.

IReplace.

I Replace.

I Replace.

I Replace.

IReplace as necessary.

Shorted OB/1II, OB82. 9B/1I3,
I Replace as necessary.
ge.4, DB05, D80b, QSI9, Q528,
0521, 9522, and/or TB01.

I

I Replace.

Repl.ce.

Replace.
Resolder.

Supply the lIlissing voltage.

Replace.
Resolder •

REPAIR

Blowing fuses.

Defective IC4/119 and/or 418.

LED on the input level
does not light.

fader control.

~ectiYe

Defective IC481 and/or Q483.
Cold soldering on 9403.

One channel out.

No rear output.

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.

PROBLEt1

No sound, no turn on.

SYI'IPTQM
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Title                           : Alpine 3502 Code 02 Bridgeable Power Amplifier Service Manual
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Subject                         : www.analogalley.com
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Modify Date                     : 2009:04:14 19:06:03-05:00
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