Sony TC-A790 motor gear


Units Sold: 1

  • Item name: Sony TC-A790 motor gear
  • Original part no.: X-3363-501-1
  • Quantity: 1
  • Material: POM
  • Colour: white
  • Dimensions: stronger than original
  • Functionality was tested.


Item: Sony TC-A790 motor gear for cassette players with TCM-190 mechanics

Sony TC-A790 motor gear is custom made professionally using CNC lathe and gear hobing machine. Lot of manual work is involved. Quality of this replacement gear is better than original. For better dimension stability over time and temperature, gears are produced using CNC technology instead of injection molding. To prevent cracking, gear is designed to be stronger than original. Material used is POM, the best material for gears and other long lasting parts. The gear is not 3D printed!

This Sony TC-A790 motor gear solve famous problem of Sony decks with TCM-190 mechanics. In many Sony cassette decks, this gear is cracked and causes noisy or faulty rewind or complete malfunction. When doing maintenance, check your gear under magnifying glass. If it is cracked or too soft and fragile, then it needs to be replaced.

For instructions, how to fix your player, check our guide.

Get your spare parts to be able to fix your cassette player. Check our General Repair Instructions to find basic information about tools and skills needed to repair your player.

Unlike modern electronics, your cassette deck was built to last for decades. However, even this player contains some parts that deteriorate and you need to replace them. To fix it, you will need to perform some routine tasks, like replace rubber parts,  do cleaning and lubrication. Finally, you should adjust and check azimuth, output level and speed. Read our Instructions section to learn more about repairs.

Cannot find your part here? First of all, try to find it using our search form. If you cannot find it anyway, then measure dimensions of your part, visit appropriate shop category and choose part that has dimensions similar to your one. Still cannot find it? Use our inquiry form. Before you contact us, rather check other sources of useful information, first. We cannot guarantee to answer all technical questions because of time restrictions.

Most probable reasons of cassette player failure

  • Aged belt – needs to be replaced, there is no other help.
  • Pinch roller – clean it well with IPA. If it doesn’t help, then you need to replace it.
  • Corroded battery contacts – clean them well
  • Volume pot oxidized – there are special sprays for that purpose. Apply only small drop, do not spray everything

Other: leaked capacitors, cracked plastic parts, old grease and oil turned into glue, dirty switches, dirt inside player, worn head (can be lapped), faulty electronics, damage caused by leaked battery, dry motor bearings

After each repair of cassette player, speed must be adjusted!

Read more about tools you need
PLEASE, read manuals and FAQ section before you send me the message or question.

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Additional information

Weight 0.005 kg
Dimensions 10 × 10 × 10 cm


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