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Sony TC-K870ES

3-Head Stereo Cassette Deck

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Sony TC-K870ES


Type: 3-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.8 cm/s

Heads: 1 x record, 1 x playback, 1 x erase

Motor: 1 x reel, 1 x capstan, 1 x aux

Tape Type: type I, Cr02, Metal

Noise Reduction: B, C, HX Pro

Frequency Response: 15Hz to 22kHz  (Metal tape)

Signal to Noise Ratio: 76dB  (dolby C)

Wow and Flutter: 0.024%

Total Harmonic Distortion: 1.0%

Input: 77.5mV (line)

Output: 0.44V (line)

Dimensions: 430 x 135 x 350mm

Weight: 6.9kg

Accessories: remote control

Year: 1990


service manual   English - Web Police

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Differences in TC-K870ES and TC-K890ES decks

I had an almost new, under-warranty Sony TC-K870ES deck with a problem replaced by Sony with a TC-K890ES deck. I have an owner's manual, but can find no other manuals for the TC-K890ES. I think that they are basically the same.

This is an excellent vintage Elevated Series deck. It has had minimal use, and has been treated with care for many years. Recently a friend asked me to transfer a priceless cassette recording to CD for him. I placed it in the TC-K890ES, and did not notice that it was not tightly wound. When I rewound it for cueing, the tape became tangled around the capstan. Now the electrically-powered cassette well door is stuck due to the entanglement, and I cannot find anyone who knows how to get into the deck to attend to the problem. Sony does not even list this deck on their support site any longer. I am not sure what the difference in the decks is, but I have a service manual for the TC-K870ES. I would appreciate any help offered by someone who has a suggestion.

removing tape from transport

Most Sony decks use a cam and lever arrangement to raise and lower the head plate. They are driven by the capstan motor or flywheel. If you can remove the cover and see the flywheels, try rotating them with your finger to drive the cam into the stop position. You may also have to push in a solenoid to release the cam. Once the head deck is down, you can open the door.

This website is not affiliated with or sponsored by Sony. To purchase TC-K870ES spares or accessories, please contact the company via their website or visit an authorised retailer.