Sony MEX-BT3900U Service-Handbuch - Seite 4

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MEX-BT39UW/BT3900U/BT3950U

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.

TEST DISCS

Use following TEST DISC when this set conﬁ rms the operation

and checks it.

Part No.

Description

3-702-101-01

YEDS-18 (for CD)

4-225-203-01

PATD-012 (for CD)

NOTE FOR THE 20-PIN CONNECTOR (CN901)

Do not use alcohol to clean the 20-pin connector (CN901) connect-

ing the front panel with the main body.

Do not touch the connector directly with your bare hand. Poor con-

tact may be caused.

EXTENSION CABLE AND SERVICE POSITION

When repairing or servicing this set, connect the jig (extension

cable) as shown below.

•

Connect the MAIN board (CN701) and the SERVO board

(CN401) with the extension cable (Part No. J-2502-076-1).

MAIN board

(CN701)

NOTE FOR REPLACEMENT OF THE BT BOARD

When repairing, the complete BT board should be replaced since

any parts in the BT board cannot be repaired.

NOTE FOR REPLACEMENT OF THE SERVO BOARD

When repairing, the complete SERVO board should be replaced

since any parts in the SERVO board cannot be repaired.

NOTE FOR REPLACEMENT OF THE SWITCH BOARD

When SWITCH board is defective, exchange the MECHANICAL

BLOCK ASSY (P).

extension cable

(Part No. J-2502-076-1)

SERVO board

(CN401)