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* Maximum power output of: 50 watts per
channel with a 4-speaker system, 40 watts x 2
plus 140 watts x 1 with a 3-speaker system or
120 watts per channel with a 2-speaker
system (at 4 ohms).
¢Wide dynamic range and low distortion (less
than 0.005%).
¢ Provided with a protection circuit.
* Pulse power supply" forstable and regulated
output power.
¢ Direct connection can be made with the
speaker output of your car audio if it is not
equipped with the line outputs (High level input
connection).
*Pulse power supply
This unit has a built-in convertor which
converts the power supply from the DC 12 volt
car battery into high speed signals by the use
of the semiconductor switch. These signals
will be stepped up by the built-in pulse
transformer and separated into both positive
and negative power supplies before' being
converted into the direct current again. This is
to regulate the otherwise variable voltage of
the car battery.
The light weight power supply system provides
the highly efficient power supply with a low
impedance ouiput.
TABLE
OF
CONTENTS
Section
Title
Page
1.
GENERAL
oon
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2. DIAGRAMS
2-1.
Block
Diagram wii eeessssceseceesscssceeeetecnecessesenseeeteensenssaseasees 5
2-2.
Printed Wiring
Boards. cccsscsseceeeereseesssessseseessseseseees 7
2-3.
Schematic
Diagram, .......cccccccccsssscsssosoessensosvessscsssoesstasesecesageenens 9
2-4. Semiconductor
Lead
Layouts wc seseeeeseseeteeeeereeseeees 11
3. EXPLODED:
VIEW |. ccsoiaitnaa hibuingucmialamers: 12
4. ELECTRICAL
PARTS
LIST ee
13
Fuse Replacement
If the fuse blows, check the power connection
and replace the fuse. If the fuse blows again
after the replacement, there may be an internal
malfunction. In such a case, consult your
nearest Sony dealer.
Warning
Use the specified fuse with correct amperage
rating.
Use of a fuse with higher amperage rating may
cause serious damage to the unit.
*Protection circuit
This amplifier is provided with a protection
circuit which operates in the following cases
"when:
~~ the unit is overheated
~~ a DC current is generated
— the speaker terminals are short circuited.
The color of the POWER/PROTECTOR
indicator will change from green to red and the
unit will shut down. If this happens, turn off the
connected equipment and take out the
cassette tape or disc and determine the cause
of the malfunction. If the amplifier has
overheated, wait until the unit cools off.
POWER/PROTECTOR
indicator
SERVICE
NOTE
Notes
in regard to replcing the power
ampli-
tude
transistors
(Q112,
113, 212, 213, 312, 313, 412, 413)
When
replacing the transistors
used for power
ampli-
tude section (25B1587,
25D2538), replace both transis-
tors with same
hfe ranks for each channel.
type
number
hfe
ranks
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