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TABLE OF CONTENTS
WM-GX221
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.
1. SERVICE NOTE
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2. GENERAL
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3. DISASSEMBLY
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3-1. Panel (Cabinet Front), Cabinet (Front) Assy ·································· 5
3-2. MAIN Board, Mechanism Deck (MT-WMGX221-175) ················ 6
3-3. HE901, HRP901, M601, Belts ························································ 7
3-4. SUB Board ······················································································ 7
4. MECHANICAL ADJUSTMENT
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5. ELECTRICAL ADJUSTMENT
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6. DIAGRAMS
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6-1. Block Diagram – Tuner Section – ················································· 11
6-2. Block Diagram – Main Section – ················································· 12
6-3. Printed Wiring Boards ·································································· 13
6-4. Schematic Diagram – MAIN Board (1/2) – ·································· 14
6-5. Schematic Diagram – MAIN Board (2/2) – ·································· 15
6-6. IC Block Diagrams ······································································· 16
7. EXPLODED VIEWS
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7-1. Overall Section ············································································· 17
7-2. Cabinet (Front) Section ································································· 18
7-3. Mechanism Deck Block-1 (MT-WMGX221-175) ······················· 19
7-4. Mechanism Deck Block-2 (MT-WMGX221-175) ······················· 20
8. ELECTRICAL PARTS LIST
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