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Extracted text from sony wm fx 451 service manual (Ocr-read)
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Flexible Circuit Board Repairing
¥ Keep the temperature of the 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
unsoldering.
Notes on chip component replacement
¥ Never reuse a disconnected chip component.
¥ Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location of parts and controls ............................................ 3
2. DISASSEMBLY
2-1. Cabinet (Rear) Sub Assy Removal ............................. 4
2-2. Main Board Removal ................................................. 5
2-3. Mechanism Deck Removal ......................................... 5
2-4. Holder, Cassette Assy Removal .................................. 6
2-5. Display Board Removal ............................................. 6
3. ADJUSTMENTS
3-1. Mechanical Adjustments ............................................ 7
3-2. Electrical Adjustments ................................................ 7
4. DIAGRAMS
4-1. Explanation of IC Terminals ..................................... 10
4-2. Block Diagram ........................................................... 11
4-3. Printed Wiring Boards .............................................. 13
4-4. Schematic Diagram ................................................... 17
5. EXPLODED VIEWS
5-1. Cabinet Section ......................................................... 23
5-2. Mechanism Section (MF-WMFX453-114) .............. 24
6. ELECTRICAL PARTS LIST ................................... 25
mark
mark
CF2
X2 Mark Center Frequency
red 10.70MHz
blue 10.67MHz
orange 10.73MHz
black 10.64MHz
white 10.76MHz
¥ HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and X2.
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 itÕs supply two pieces in one package as a spare parts
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SECTION 1
GENERAL
LOCATION OF PARTS AND CONTROLS
This section is extracted from
instruction manual.
¥ Abbreviation
FR : French
E : Radio section : FM MONO/ST switch
7E : Radio section : DX/LOCAL switch