JVC CX-7K Service Manual

The CX-7 (also known as CX-7K) was a stereo cassette player manufactured by the JVC Corporation in 1986. It had auto-reverse transport mechanism with full logic control, making it one of the most advanced players with extreme high-end microminiaturisation technology. This unit has two miniaturised motors, where one drives the capstan, whilst the other actuates the transport mechanism. Consequently, they had to use a microcontroller (M51556P) to provide the system control functions, and a huge plethora of discrete transistors to produce the necessary logic required.

For audio reproduction the CX-7 uses a BA3503F integrated circuit (IC) to provide the preamplifier and power amplifier functions. It also has a dedicated IC (BA1102F) to provide the Dolby noise reduction facility. For the capstan motor speed control, they use the AN6612S IC. This stereo cassette player is extremely rare and as a result the prices can be very high as it is a highly sought after unit.

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