Sony SA-WCT291 Instrukcja serwisowa - Strona 4

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HT-CT290/CT291

UNLEADED SOLDER

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)

: LEAD FREE MARK

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 ﬂ ow)

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.

NOTE OF PERFORMING THE OPERATION CHECK IN

THE STATE THAT HEAT SINK WAS REMOVED

When performing the operation check in the state that this unit was

disassembled, it is possible to perform the operation check in the

state that heat sink was removed. But don't perform the operation

check in the long time, and perform the operation check in the

volume state as low as possible.

CAPACITOR ELECTRICAL DISCHARGE PROCESSING

When checking the board, for the electric shock prevention, con-

nect the resistors to both ends of capacitors to discharge the capaci-

tor as shown in the ﬁ gure below.

Note 1: When the connector that connects the SWITCHING REGULATOR

3L411L board (US, CND) or SWITCHING REGULATOR

3L411W board (Except US, CND, E12) or SWITCHING

REGULATOR 3L411W-1 board (E12) to the MAIN board is

disconnected before discharging, completely ﬁ nish discharging

both boards, and then reconnect the connector. If discharging is not

complete, sparking may occur when connecting the connector and

cause a blown fuse.

Note 2: Be sure to discharge using a resistor of 800 Ω or higher.

(Do not discharge with a 0 Ω resistor)

Discharging at a point where excessive electric current ﬂ ows

through a fuse may cause the fuse to blow.

– MAIN Board (Component Side) –

SECTION 1

SERVICING NOTES

MODEL IDENTIFICATION

Distinguish by Part No. and destination code on the bottom side

of the main unit.

C1038

800 /2 W

C1040

• Abbreviation

– SWITCHING REGULATOR 3L411L Board

(US, CND) (Conductor Side) –

– SWITCHING REGULATOR 3L411W Board

(Except US, CND, E12) (Conductor Side) –

– SWITCHING REGULATOR 3L411W-1 Board

(E12) (Conductor Side) –

– Back view –

MODEL LABEL

Destination code

Part No.

Model

HT-CT290 (Black): US CND

HT-CT290 (Black): AEP

HT-CT290 (Black): UK

HT-CT290 (Black): RU

HT-CT290 (Black): E12

HT-CT290 (Black): E3

HT-CT290 (Black): EA

HT-CT290 (Black): SP

HT-CT290 (Black): AUS

HT-CT290 (Black): TH

HT-CT290 (Black): LA9

HT-CT291 : AEP

HT-CT291 : UK

HT-CT291 : RU

HT-CT290 (White): EA

HT-CT290 (White): SP

HT-CT290 (White): TH

AUS

: Australian model

CND : Canadian model

: 240 V AC area in E model

E12

: 220-240 V AC area in E model

: Saudi Arabia model

LA9

: Latin-American model

: Russian Model

: Singapore model

: Thai model

C201

800 /2 W

Part No.

4-688-015-0[]

4-688-015-1[]

4-688-015-2[]

4-688-015-3[]

4-688-015-4[]

4-688-015-5[]

4-688-015-6[]

4-688-015-7[]

4-688-015-9[]

4-688-016-0[]

4-688-016-2[]

4-688-017-0[]

4-688-017-1[]

4-688-017-2[]

4-693-269-2[]

4-693-269-3[]

4-693-269-5[]