Sony wm fx 421 v service manual

Page 2

TABLE OF CONTEMTS

Section Title Page

SECTIONI GENERAL ..

SECTION 2 DISASSEMBLY

2-l. Cabinet (Rear) Assembly
2»2i Mechanism Deck and Main Board
2-3i Main Board ..............................
2-4. Cassette Lid...
2-5i Display Board i
2-6. Note for Installation

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SECTION 3 ADJUSTMENTS
3»l. Mechanical Adjustments .i
3-2i Electrical Adjustments u

SECTION 4 DIAGRAMS
4-1. Printed Wiring Board
4-2. Schematic Diagram i,
4-3, IC Block Diagrams ............................................................. 13
4-4. IC Pin Function

lC401 Tuner Controller/LCD Drive

(uPD1724GB-710-1A7) 19

SECTION 5 EXPLODED VIEWS
5-1, Cabinet and Board Section ....................
5-2. Mechanism Section (MF-WMFX305-43)

SECTION 6 ELECTRICAL PARTS LIST 22

HOW TO CHANGED THE CERAMIC FILTERS

This model is used two ceramic filters of CFZ, X2l You must used
same type of color marked ceramic filters in order to meet same
specifications

Therefore, the ceramic filter must changed two pieces together since
its supply two pieces in one package as a spare parts,

color mark
color mark Center Frequency

CF2 red 10.70MHZ
blue I 0,67MHz

col k
0,7, orange l0i73 MHz

0

X2 black 10.64MHZ
white 10.76MHz

Notes on chip component replacement

' Never reuse a disconnected chip component

- Notice that the minus side of a tantalum capacitor may be
damaged by heat.

Flexible Circuit Board Repairing

° Keep the temperature of soldering iron around 270°C during
repairing.

- Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

' Be careful not to apply force on the conductor when soldering
or unsolden'ngi