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updated comdition 9-9-26need repair...
Sony Walkman Professional WM-D6C Stereo Cassette Recorder – For Parts / RepairUp for sale is a vintage Sony Walkman Professional WM-D6C, highly regarded by collectors as one of the best portable cassette recorders ever built. This unit is being sold As-Is for parts, repair, or restoration only.Condition Details:* Power Source: The unit successfully powers on when using a correct external power supply. It does not operate using internal batteries (likely due to a detached wire or tarnished terminal contacts inside the battery tray or stuck pressure pad in power input terminal).
* records and Fast-forward and rewing work.
*play function has the spindle trying to rotate but just clicks. when played back for the first time The mechanism spins and plays, but the tape speed runs too fast, causing a higher-pitched, chipmunk-like tone. The speed remains locked at this fast rate and does not adjust using the pitch control knob.
* Cosmetics: In fair to good vintage cosmetic condition with typical minor scuffs and surface wear from use. Please see all photos to evaluate the physical condition.What is Included:* Sony WM-D6C Walkman unit
* Original Sony protective leather carrying case (shows standard signs of age/wear)
* Batteries, tapes, headphones, and power supply are NOT included.* Power Functionality: This unit has been Tested and successfully powers on via the external DC power jack using a correct power supply. However, it fails to operate on battery power alone. The battery compartment is complete but will require internal terminal inspection as discussed earlier.* The Playback/Speed Issue: The tape transport functions, but the audio playback runs much too fast (resulting in a high, fast pitch). The speed does not respond to or adjust with the pitch controls. For transparency, this is a well-known symptom on the WM-D6C model, typically caused by a failed CX20084 speed control servo IC—a very straightforward fix for someone skilled in vintage restoration.Because of the speed regulation and battery power issues, this item is sold completely As-Is with no returns or guarantees. Perfect for a technician\'s workbench or as a high-quality parts donor. Buy with confidence based on the detailed description!Again....The Sony Walkman Professional WM-D6C requires a very specific, unforgiving power configuration. Using a modern, generic AC adapter or an incorrect multi-voltage supply is almost always what destroys these units.
## Official Power Requirements
To run safely without damaging the delicate internal circuitry, an AC adapter must meet three strict criteria:* Voltage: 6V DC exactly.
* Polarity: Center Negative ($\\ominus\\cdot\\oplus$). This is opposite to most modern consumer electronics, which use center-positive plugs.
* Current: Minimum of 300mA to 500mA.## The Danger of Generic Power Supplies
The WM-D6C is notoriously sensitive because Sony did not build reverse-polarity protection into the DC input circuit.* Unregulated Voltage: Cheap 6V adapters often output up to 9V or 10V when not under a full electrical load. This excess voltage will burn out the Walkman\'s DC-to-DC converter stage.
