Hi! I've recently got my hands on a SONY WM-D6C in excellent aesthetics conditions. I initially had issued with FF/REW and changed a spring to get contact and more or less fixed that issue, but I still have a problem with the wow and flutter. When I play cassette from the start the wow and flutter is not noticeable but, when the pick up reel starts to accumulate tape, the wow and flutter begins to increase, slowing down the tape immensely until it finally stops and activates auto stop. Same with FF/REW, they don't work at the end of the tape as if its not strong enough. If it clues anyone into anything, the FF/REW give up before the main mechanism does. I have also looked into this through this group and followed @Valentin instructions regarding the Capstan being roughened with ferric chloride. but did not help much. I dont know if this is simply an issue of old belts/plastic that need replaced. I feel hopeless and hope someone could point me in the right direction!
If you haven't replaced the rubber in it, that's the thing you should do. Fact you have low torque on FF/REW and on takeup is a tell-tale sign your rubber idlers are slipping. You can get the kit here: https://fixyouraudio.com/product/sony-wm-d6c-cassette-player-walkman-complete-rubber-set/
Wow thank you! I was doubting how much it actually affects it but its now ordered and I'll update once ive replaced the rubber!
