XM-554ZR - Sony Car Audio Service Manual (repair manual). Page 2

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Location and Function of Controls .......................................... 3
Connections ............................................................................. 4

2-1.   Bottom Plate ........................................................................ 7
2-2.   AMP Board Section ............................................................ 8
2-3.   Panel (Front) ........................................................................ 8

3-1.   Block Diagram .................................................................... 9
3-2.   Printed Wiring Board ........................................................ 11
3-3.   Schematic Diagram –AMP Section (1/2)– ........................ 12
3-4.   Schematic Diagram –AMP Section (2/2)– ........................ 13

4-1.   Heat Sink (Main) Section .................................................. 15
4-2.   AMP Board Section .......................................................... 16

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1. Short across TH901 with the power on.
2. Verify that the protector is operated and LED901 (former type),

D918 (new type) illuminates green. When input the signal and
verify that there is no output on the SP-OUT even when the
volume is increased.

3. Verify that the protector is released and there is an output on the

SP-OUT when the short is removed.

4. Likewise, perform items 1 to 3 for TH902 and TH903.

1. Short between the positive and negative sides of the speaker

output terminals CN903 and CN904 with the power on.
(Perform this shorting for each channel on FRONT and REAR.)

2. Verify that the protector is operated and LED901 illuminates

red.

3. Verify that the protector is not released and LED901 remains

red even when the short is removed.

4. Verify that the protector is released and LED901 illuminates green

when the power is turned off and then on again.

1. Short between the +12V terminal of CN905 and the (L+R) + or

(L+R) – of the speaker output terminal CN904.
(Short between +12V terminal and (L+R) + and between +12V
terminal and (L+R) –.)

2. Verify that the protector is operated and LED901 illuminates

red.

3. Verify that the protector is not released and LED901 remains

red even when the short is removed.

4. Verify that the protector is released and LED901 illuminates green

when the power is turned off and then on again.

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 viscous (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.

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

damaged by heat.

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