SA-W2500, SA-W3000, SA-W3800 - Sony Audio Service Manual (repair manual). Page 3

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Specifications ............................................................................  1

1-1. Printed Wiring Boards
       - INPUT CONTROL, LED And SWITCH boards - ..... 5
1-2. Schematic Diagram
       - INPUT CONTROL, LED And SWITCH boards - ..... 6
1-3. Printed Wiring Boards  - MAIN board - ...................... 7
1-4. Schematic Diagram  - MAIN board - .......................... 8

2-1. Cabinet Section (W2500) ............................................ 9
2-2. Cabinet Section (W3000) .......................................... 10
2-3. Cabinet Section (W3800) .......................................... 11
2-4. Amp Section (W2500) ............................................... 12
2-5. Amp Section (W3000/W3800) .................................. 13

.................................... 14

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 

°

C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 

°

C.

Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

s 

× 

4: New type (Star boss)

a 

× 

4: Former type (Screw boss)

GRILLE FRAME (WITH CLOTH)

Logo

GRILLE FRAME (WITH CLOTH) of SA-W2500 has been changed
in the midway of production.
Boss’s position has been changed by above-mentioned change. And,
LOUD SPEAKER (25 cm) has been changed at the same time.
When replacing the GRILLE FRAME (WITH CLOTH) or LOUD
SPEAKER (25 cm), replace it after confirming the shape of GRILLE
FRAME (WITH CLOTH).