Motor Speed Adjustment On AM FM Cassette Player.

This is one of the most fascinating channels I’ve ever found on YouTube. Thank you for sharing.

Great video, thanks for the upload. It's the first of its kind that I've seen on youtube. For the ~warble/flutter, first, do a tape path cleaning that ensures the capstan (the spinning metal pin that operates inside the hole of the open edge of the cassette when playing/ recording) and, especially, the pinch roller that presses into capstan to draw the cassette ribbon through are both clean. I use 70-90% alcohol (Walmart/CVS/Walgreens) on longer reach swabs packaged in pairs in a box of ~100 from a local medical supply store. .... Magnetic debris comes off from passing so many hours of tape ribbon after which you'll see a brownish banded area the width of cassette ribbon accumulate on the roller and, though not as easily observable, the capstan. One wants the pinch roller(s) and capstan(s) to have the same, even tone/ sheen across the width of the surfaces. Keep alcohol away from the base of the capstan pin so as to not affect any lubricant. Push "Play"/▶️ with the deck door open and apply the wet (but not dripping) swab while clear of the pinch point where capstan and roller meet to keep from fraying material off the swab head to save cleaning that out. Roll the swab to maximize use of its cleaning surface which may have you reaching, regardless, for a few to as many as upwards of 10 or more depending on how dirty things are/ difficult it is to remove. Rewet swabs if necessary to make use of the entire swab head. If the capstan has stubborn debris left after clearing the pinch roller, stop the deck then press Fast-Forward/FF/⏩️ so the pinch roller isn't brought into play with the capstan while using the increased rotations to expedite debris removal via repeat swab application. For very stubborn capstan debris, I've used a pencil eraser gently applied to ~scrub but not grind off eraser material into the deck. After pinch roller and capstan, use only fresh swabs on the playback and record heads so as to not displace debris from other areas and harm the sensitive head(s). Significant improvements to audio quality are typically heard at this point. If the player won't function for maintenance with the door open, decks have a lever ~armature or ~pin/~rod sensing the open door which can circumvented by holding your other hand's thumb/finger against that so the deck will actuate and activate for the maintenance activity. If there's still warble/flutter, then follow up with belt inspection and checking the motor as shown here. 👍

Here's a little tip/trick to get cassette players at the exact right speed. For this you have to get a perfect working cassette recorder, and record a 1Khz sine wave signal from YouTube. These testsignals are spot on. Then place this recorded cassette in the player that needs adjustment, connect the audio output to a scope, and set the speed of the motor to get exact 1Khz signal. Same tip/trick can be used for older cd players. As a audio source you can use your computer/laptop to play the testsignal, but you can also use a Mp3 player as a "poorman's signal generator" to play these testsignals.

Thank you very much. I restored my grand father's Akai CS-702DII and the speed adjustment was the only thing I can't solved. It's done now with your help.

I just had the same problem with an old 'technics' tapedeck that didn't ran for 20 years. Your video was a big help. Thank you... ;)

Sometimes the motors go bad. Not sure what goes wrong with them but had many that won't hold a steady speed. Also there are decks with the hole in the back of motor, but nothing in there to adjust.

I found the hole at the back of the cassette motor, but theres nothing, it just speeds up the motor and the music if it reached the inside… And actually the motor have 4 wires and it looks like it can control the speed itself when it was slow or fast

I did thumbs up the video, and I am subscribed. Thanks Dave!

THIS IS HAPPENING TO ME!!!! THANK YOU SO MUCH

Worth knowing, cheers 👍

Great tip!

Dave, I've got a great dual cassette boombox system that will play cassettes, but it will not fast forward or rewind on either deck. Any ideas?

Helpful video. I've worked on/opened motors before to clean the armatures being very careful with the carbon brushes which can easily break. Some motor cases are crimped shut 😑, grrrr, while older ones have screws😊. I have a mid 80s Panasonic boom box with Cassette whose belts are loose. I save most of the belts I change out but had to resort to an assorted size flat and square belt kit. These belts are from China and are so thin and flimsy compared to those you could get years ago. I don't know where you can buy decent belt kits anymore. They seemed to work Ok, but the speed was slow and it would slow down even more and then speed up. The motor has the little hole in the back and I think I'll try to adjust the screw and if needed spray the Contact lube cleaner. Does the contract cleaner get on the brushes and can that cause a problem?

Can you fix a sangean 909x? Shortwave doesn’t seen to receive very well medium,long wave and fm work fine…

Would you know how to fix one of the big massage chairs? I'm in GP

What would the fix be for one that’s a little loud and sometimes just stops?

I wish we did not live on opposite sides of the country I have a tv I would love to have fixed!

It might have also been old grease on the bearing of the motor and squirting the cleaner in could have cleared it. (?)

Maheshwar mp India se

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