2
M-740V
TABLE OF CONTENTS
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.
1. GENERAL
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3
2. DISASSEMBLY
2-1. Lid Assy, Cassette .......................................................... 4
2-2. Lid, Battery Case ........................................................... 4
2-3. Cabinet (Rear) Assy ....................................................... 5
2-4. Speaker Assy, Microphone ............................................ 5
2-5. Main Board .................................................................... 6
2-6. Mechanism Deck ........................................................... 6
2-7. LED Unit ....................................................................... 7
2-8. Head, Creamic (HRPE901, 902) ................................... 7
3. MECHANICAL ADJUSTMENTS
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8
4. ELECTRICAL ADJUSTMENTS
...............................
8
5. DIAGRAMS
5-1. Block Diagram ............................................................ 11
5-2. Printed Wiring Board ................................................... 12
5-3. Schematic Diagram ..................................................... 13
6. EXPLODED VIEWS
6-1. Cabinet Section ........................................................... 14
6-2. Mechanism Deck Section (1) ...................................... 15
6-3. Mechanism Deck Section (2) ...................................... 16
7. ELECTRICAL PARTS LIST
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17