Question about Sony Walkman WM-D6C Personal Cassette Player

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My Walkman Professional WM-D6C plays back with irregular speed

I only have tried using batteries and need to track down a DC6V adapter to see if that solves the problem. On playback and recording the speed starts out much faster than a normal cassette deck and then eventually slows down, drifts, and often flutters wildly as well. Sometimes it plays normally but its totally unreliable. I took the eraserhead away for additive recording but I dont think that should have screwed up anything. Anyway, the walkman acted like this since the day I bought it from the local thrift store. Nice find! ...maybe

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  • mfish2k Sep 29, 2009

    oh.. and when I insert the batteries into the machine I can instantly hear some kind of buzzing. serial number is 68294. When the speed tune is on, the playback is more reliable. When its off the speed will be fast or flutter or drift. Any way to make recording possible with the speed tune activated?

  • mfish2k Oct 06, 2009

    ...and now a tape is stuck in it too! The stop button won't pop the tape out and whatever holds it in there won't let go. Stop still stops playback. Rewind and fastforward don't stick down.

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5 Suggested Answers

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SOURCE: WM-D6C in ex condition ... only there's no power at all ... can anyone help or recommend someone who can repair it in the UK?

try going to servicemagic.com for a location near you

Posted on Jul 17, 2007

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night71
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SOURCE: WM-D6C Battery holder

Because of the age of the unit, Sony will not carry that part. However, keep an eye on E-bay and yard sales and thrift stores and hopefully you can pick one up real cheap. Good Luck

Posted on Oct 29, 2007

  • 1 Answer

SOURCE: Sony Walkman WM-D6C

If your WM-D6C has a serial number below 267201 (take out the battery block and you'll see the serial number sticker there) then the problem is electronic, not mechanical. It is likely due to the speed controller chip (labeled as IC601 on the circuit board), which is made by Sony and is type CX20084. This chip decides the voltage that is fed to the motor which is only about 2.4 volts, Should the chip be defective then the motor receives about twice this voltage and thus runs too fast. If you take the back off the recorder you will see the circuit board; it looks like a rectangle with a small square extra bit sticking out to the right. It is here that the IC601 resides. It is about the size of a small pinky finger nail and has 8 tiny legs down each side. Measure the voltage on pin 15 (put one voltmeter probe (+) on the second leg down on the right side (pin 15) and the other one (-) on the battery negative), it should read about 4.8 volts, which it feeds into the base of transistor (Q601) that in turn will then feed 2.4 volts to the motor (if everything is working OK). If the chip is damaged, then the voltage on pin 15 will be close to zero, and the transistor Q601 will not be "held back" and so will feed about 5 volts to the motor. CX20084 is (unfortunately) obsolete, someone in the UK sells them for about $50, but an excellent company in Hong Kong (utsource.net) sells them for $5 (plus $8 S&H). Taking out the old chip and putting in a new one is close to microsurgery, you will need a micro soldering iron (18Watt Antex), a good eye, a powerful magnifying glass and a steady hand, but it can be done - I've done it! There is a possible second reason that could cause the motor to run too fast. There is a pick up coil on the main flywheel called FG901. If this is damaged it will be open circuit and then the only use for your recorder is probably a paper weight. You can test this by going back to chip IC601 and locating pin 1 (top left pin; a small circle on the body of the chip is next to pin 1), Pin 1 is connected to the positive side of a capacitor,  C602 (0.47 microF), check the resistance from the negative side of C602 to the ground (take battery out, and use battery (-) as ground). You should get about 600 - 650 ohms reading. If you get nothing, sorry there is not much you can do about it as these pick up coils are definitely not available. Finally, chip 601 (CX20084) goes bad if you connect the batteries back to front. Good luck. Giles..

Posted on Jan 16, 2009

  • 15 Answers

SOURCE: My Sony Walkman Professional WM-D6C will turn on

Contact me at my email doctor.walkman @ gmail.com, I'll ask you some questions and some photos of the WM-D6C in his possession. We will solve the problem

Posted on Oct 18, 2010

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