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WM-EX170/EX172 SERVICE MANUAL Canadian Model WM-EX170 AEP Model E Model WM-EX170/172 Photo : WM-EX172 Manufactured under license from Dolby Laboratories Licensing Corporation. "DOLBY" and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation. Model Name Using Similar Mechanism Tape Transport Mechanism Type NEW MT-WMEX170-114 SPECIFICATIONS · Power requirements 3V DC batteries R6 (AA) Ч 2 / External DC 3V power sources · Dimensions 88.5 Ч 111.5 Ч 37.6 mm (3 1/ 2 Ч 4 1/ 2 Ч 1 1/ 2 inches) (w / h/ d) incl. projecting parts and controls · Mass EX170 : Approx. 125 g (4.5 oz) / Approx. 185 g (6.6 oz) incl. batteries and a cassette EX172 : Approx. 130 g (4.6 oz) / Approx. 190g (6.8 oz) incl. batteries and a cassette · Supplied accessories Stereo headphones or Stereo earphones (1) / Belt clip (1) Design and specifications are subject to change without notice. CASSETTE PLAYER MICROFILM TABLE OF CONTENTS 1. 2. 2-1. 2-2. 2-3. 2-4. 2-5. GENERAL ······································································ 2 DISASSEMBLY Cabinet (Front) Assy ·························································· 3 Main Board ········································································· 4 Cassette Lid ········································································ 4 Mechanism Deck ································································ 5 Belt, Motor (Reel/Capstan) ················································ 5 Flexible Circuit Board Repairing · Keep the temperature of the soldering iron aroud 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 damaged by heat. 3. 4. 5. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. MECHANICAL ADJUSTMENT ······························ 6 ELECTRICAL ADJUSTMENT ································ 6 DIAGRAMS Block Diagram ··································································· 7 Printed Wiring Board (EX170 Model) ······························· 9 Schematic Diagram (EX170 Model) ································ 11 Printed Wiring Board (EX172 Model) ····························· 13 Schematic Diagram (EX172 Model) ································ 15 IC Block Diagrams ··························································· 17 6. 6-1. 6-2. 6-3. 6-4. EXPLODED VIEWS Cabinet Section ································································· 18 Main Board Section ·························································· 19 Mechanism Section-1 (MT-WMEX170-114) ·················· 20 Mechanism Section-2 (MT-WMEX170-114) ·················· 21 7. ELECTRICAL PARTS LIST ··································· 22 SECTION 1 GENERAL This section is extracted from instruction manual. EX172 MO