Toshiba KT-4058 Service Manual

The KT-4058 (also known as KT-V850 Walky) was a stereo radio cassette recorder manufactured in 1988 by the Toshiba Corporation of Japan. The radio tuner had AM and FM band reception consisting of a miniature ferrite core antenna for the AM circuitry. This unit sports a graphic equalizer, and has capability to use metal and chrome tapes. It has an AC bias recording system, with magnetic erasure. The audio output is 20 mW per channel, and the unit requires a pair of AA size dry cells. Its dimensions are 80 mm × 122 mm × 32 mm, and mass 260 g without batteries.

Review

This was a wonderfully designed portable cassette recorder with auto-reverse transport mechanism, Dolby noise reduction, and elegant slider controls for the graphic equalizer. It also sounds great due to the dedicated power amplifier IC NJM2066M manufactured by the New Japan Radio Corporation. For the tuner circuit design, Toshiba use their own chipset consisting of the TA7358F RF amplifier, TA7787AF FM-IF/AM-RF amp, and TA7373F MPX. For the DC motor circuitry it has the BA6235F motor governor by the ROHM Corporation.

In this model, the transport mechanism design uses two belts, and whilst one belt is easily accessible, the other is not and requires the removal of the PCB. Consequently, repairs can be time-consuming and expensive.

Cost/eBay

This unit is not seen often for sale; however a unit in mint condition together with its original packaging and accessories can cost well over a hundred pounds today.

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