WM-EX651
2
TABLE OF CONTENTS
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 unsoldering.
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 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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE WITH
MARK
0
ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
Notes on the AC power adaptor
• Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
• Connect the AC power adaptor to an easily accessible
AC outlet. Should you notice an abnormality in the AC
power adaptor, disconnect it from the AC outlet
immediately.
• Do not touch the AC power adaptor with wet hands.
Polarity of
the plug
1. SERVICE NOTE
................................................................ 3
2. GENERAL
........................................................................... 5
3. DISASSEMBLY
3-1.
Disassembly Flow ························································ 6
3-2.
Case Assy ····································································· 6
3-3.
Main Board ·································································· 7
3-4.
Belt (F4) ······································································· 7
3-5.
Motor (Capstan/Reel) (M901) ····································· 8
3-6.
Cassette Lid Assy ························································· 8
3-7.
Ornament (Open) Assy ················································· 9
3-8.
Holder (FS) Assy ·························································· 9
3-9.
Pinch Lever (N)/(R) Assy ·········································· 10
3-10. Magnetic Head (HP901) ············································ 10
4. MECHANICAL ADJUSTMENT
................................. 11
5. ELECTRICAL ADJUSTMENT
................................... 11
6. DIAGRAMS
6-1.
IC Block Diagrams ····················································· 12
6-2.
Block Diagrams ·························································· 13
6-3.
Schematic Diagram – Main Section (1/2)– ················ 14
6-4.
Schematic Diagram – Main Section (2/2)– ················ 15
6-5.
Printed Wiring Boards – Main Section (Side A)– ······ 16
6-6.
Printed Wiring Boards – Main Section (Side B)– ······ 17
6-7.
IC Pin Function Descriptions ····································· 18
7. EXPLODED VIEWS
7-1.
Case Section ······························································· 19
7-2.
Main Board Section ··················································· 20
7-3.
Mechanism Deck Section-1 ······································· 21
7-4.
Mechanism Deck Section-2 ······································· 22
8. ELECTRICAL PARTS LIST
........................................ 23
