Kenwood KX-4520 Manual

The Kenwood KX-4520 is a high-performance stereo cassette deck featuring Dolby B/C noise reduction, auto-reverse playback, metal tape compatibility, bias fine adjustment, 3-digit tape counter, record mute, and full logic transport controls. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Full logic transport controls, Dolby noise reduction system, auto-reverse mechanism, bias adjustment, tape selector, and record level meters.

Feature	Description
Dolby B/C NR	Noise reduction for improved sound quality
Auto Reverse	Automatic tape direction reversal
Metal Tape Compatible	Supports metal, chrome, normal tapes
Bias Fine Adjustment	Precise bias calibration for optimal recording
3-Digit Counter	Tape position indicator with memory function
Record Mute	Temporary pause during recording
Full Logic Controls	Soft-touch transport buttons
Tape Selector	Metal/CrO2/Normal tape type selection
Headphone Jack	For private listening
Recording Level Meters	LED level indicators for recording

Installation

Unpack and inspect contents. Place on stable surface away from heat sources.

1. Connect audio cables: Use RCA cables to connect to amplifier/receiver.
2. Connect power: Plug into AC power outlet.
3. Position unit: Ensure adequate ventilation around the deck.
4. Connect headphones: Optional headphone connection for monitoring.

WARNING! Keep away from magnetic fields and heat sources. Ensure proper ventilation.

First-Time Setup

Power on deck; prepare for initial use.

1. Select tape type: Set TAPE SELECTOR according to tape being used.
2. Set Dolby NR: Choose Dolby B or C according to recording needs.
3. Adjust bias: Use bias fine adjustment for optimal recording quality.
4. Test recording: Make test recording to verify levels and quality.

CAUTION! Handle tapes carefully; avoid touching tape surfaces.

Specifications

• Type: Stereo cassette deck
• Heads: 2-head system (erase/record-playback)
• Motor: DC servo motor
• Frequency Response: 30Hz-17kHz (Metal tape)
• Signal-to-Noise Ratio: 68dB (Dolby C)
• Wow & Flutter: 0.08% (WRMS)
• Inputs: Line input, microphone
• Outputs: Line output, headphone
• Power Requirements: 120V AC, 60Hz
• Dimensions: 430mm (W) x 125mm (H) x 305mm (D)

Controls and Settings

Front panel controls: POWER, PLAY, STOP, REC, PAUSE, FF, REW, EJECT, TAPE SELECT, DOLBY NR.

Additional controls: BIAS ADJUST, REC LEVEL, BALANCE, COUNTER RESET, HEADPHONE JACK.

Recording: Adjust REC LEVEL using meters; set BALANCE for stereo recording. Playback: Select appropriate TAPE TYPE and DOLBY NR setting. Transport: Full logic controls with soft-touch operation.

Connecting Devices

Audio connections: Line input/output RCA jacks. Amplifier connection: Connect to amplifier tape monitor loop.

1. Turn off all equipment before connecting.
2. Connect line output to amplifier tape input.
3. Connect line input to amplifier tape output.
4. Connect power cord last.

Tip: Use quality shielded cables for best audio performance.

Tape Operation

Supports playback and recording of standard cassette tapes.

1. Insert cassette: Press EJECT to open door; insert tape label side up.
2. Play: Press PLAY; adjust volume on amplifier.
3. Fast wind: Press FF or REW for fast forward/rewind.
4. Auto reverse: Deck automatically reverses at tape end.
5. Pause: Press PAUSE to temporarily stop tape movement.
6. Stop: Press STOP to halt all operations.
7. Eject: Press EJECT to remove cassette.

WARNING! Do not force cassette into deck; ensure proper orientation.

Recording Features

High-quality recording with adjustable levels and noise reduction.

1. Prepare source: Connect audio source to line input.
2. Set levels: Adjust REC LEVEL while monitoring meters.
3. Select tape type: Set TAPE SELECTOR appropriately.
4. Engage Dolby: Choose Dolby B or C noise reduction.
5. Start recording: Press REC and PLAY simultaneously.
6. Record mute: Use PAUSE for temporary silence during recording.
7. Monitor: Use headphones or amplifier for real-time monitoring.

Care & Maintenance

Regular maintenance ensures optimal performance and longevity.

1. Head cleaning: Use isopropyl alcohol and cotton swabs monthly.
2. Demagnetize: Use head demagnetizer every 50 hours of use.
3. Capstan cleaning: Clean capstan and pinch roller regularly.
4. Storage: Store in cool, dry place away from dust.

CAUTION! Unplug unit before cleaning. Use only approved cleaning materials.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Kenwood Corporation. For support, contact authorized Kenwood service centers. Manufactured to meet industry standards for audio equipment.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound during playback	Connections/tape	Check audio connections; verify tape has recording
Poor recording quality	Bias/levels	Adjust bias fine control; check recording levels
Tape won't play	Transport	Check if tape is properly inserted; clean transport
Auto reverse not working	Mechanism	Clean sensors; check for obstructions
Excessive wow & flutter	Belt wear	Replace drive belts; clean capstan
Dolby NR not effective	Alignment	Check Dolby calibration; clean playback head

Service: Contact authorized Kenwood service center for technical support.