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General| Brand | Sony |
|---|---|
| Model | WM-EX621 |
| Category | Cassette Player |
| Language | English |
Technical specifications of the WM-EX621 cassette player, including frequency response, output, and power requirements.
Procedures for operating the WM-EX621 in service mode, including setting up and entering different modes.
Step-by-step guide for operating Fast Forward (FF), Rewind (REW), and Play modes using various switches.
Instructions for preparing the device, inserting a tape, and basic playback operations via remote and main unit.
Explanation of advanced features like playback mode adjustment, sound emphasis, AVLS, and control locking.
Steps for disassembling the outer case sub assembly and accessing the main board.
Procedures for removing key mechanism parts like belt, motor, cassette lid, levers, and head.
Guidelines for cleaning, demagnetizing parts, and performing torque measurements for proper operation.
Steps to adjust tape speed using a frequency counter and potentiometer RV601 for accurate playback.
Block diagram, IC block diagrams, and notes for understanding circuit functionality.
Schematic diagrams, printed wiring boards, and IC pin function details for troubleshooting.
Exploded views illustrating the parts and assembly of the cabinet and main board.
Exploded views detailing the mechanism blocks and associated components for identification.
Comprehensive list of capacitors, diodes, ferrite beads, and integrated circuits with part numbers.
List of resistors, jacks, coils, transistors, switches, and other miscellaneous electronic parts.
