The Panasonic RX-5080 is a portable FM-AM-FM Stereo Radio Cassette Recorder, designed for both recording and playback of audio. This device combines the functionalities of a radio receiver and a cassette tape deck, offering a versatile audio experience.
Function Description:
The RX-5080 operates as a multi-band radio, capable of receiving FM (88-108 MHz) and AM (525-1610 kHz) frequencies. It features FM stereo reception, indicated by an "FM STEREO" indicator. The cassette deck supports stereo recording and playback across four tracks and two channels. It is compatible with various tape types, including Normal, CrO2, and Metal tapes, allowing for different recording qualities. Recording is facilitated by built-in microphones and a MIC input jack, while external audio sources can be connected via the Line In jacks. Audio output is provided through integrated speakers, a headphone jack, and Line Out jacks for connection to external amplification systems. The device also includes a tape counter with a reset button for easy tracking of tape position.
Important Technical Specifications:
- Power Requirements: The unit can be powered by AC (110-115V, 115-127V, 200-220V, 230-250V at 50/60 Hz) or by 12V DC using eight "D" size flashlight batteries (Panasonic UM-1 or equivalent).
- Power Consumption: 24 W (AC only).
- Power Output: 15 W (7.5 W x 2) RMS (max.).
- Speakers:
- Woofers: 16 cm (6.5") PM Dynamic Speaker (3Ω)
- Tweeters: 5 cm (2") PM Dynamic Speaker (4Ω)
- Input Sensitivity/Impedance:
- MIC: 0.25 mV / 200-600Ω
- Line In: 200 mV / 47 kΩ over
- Output Sensitivity/Impedance:
- Line Out: 0.42 V / 10 kΩ under
- External Speaker: 3-8Ω
- Headphones: 8Ω
- Dimensions (W x H x D): 534 mm x 265 mm x 178 mm (21" x 10 7/16" x 7").
- Weight: 5.7 kg (12 lb. 9 oz.) without batteries.
- Radio Section:
- Intermediate Frequency: FM 10.7 MHz, AM 455 kHz
- Sensitivity: FM 2.5 µV/50 mW output, AM 70 µV/m/50 mW output
- Tape Deck Section:
- Frequency Response:
- Normal tape: 50-12,000 Hz
- CrO2 tape: 50-13,000 Hz
- Metal tape: 50-14,000 Hz
- Recording System: AC bias, AC erase
- Tape Speed: 4.8 cm/s (1 7/8 ips)
- Wow and Flutter: 0.08% (WRMS)
- Program Time: 1 hour with C-60 cassette tape
- Track System: 4-track 2 channel stereo recording and playback
Usage Features:
The RX-5080 offers a user-friendly interface with clearly labeled controls.
- Controls: Volume, Balance, and Tone controls allow for audio customization. A Power/Battery Check Indicator and a Level Meter provide visual feedback on power status and audio levels.
- Selectors: A Function Selector (Line In/Radio/Tape, Power Off), Mode Selector/Beat Proof Switch (Ambience, II/Stereo, II/Mono, I), Tape Selector (Metal/CrO2/Normal), and Band Selector (FM/AM) enable users to switch between different modes and settings.
- Cassette Operation: Dedicated buttons for Record, Rewind/Review, Fast Forward/Cue, Playback, Stop/Eject, and Pause provide full control over tape operations. A Tape Counter with a Reset Button helps in locating specific sections on the tape.
- Connectivity: Microphone jacks, Line Input jacks, Line Output jacks, and External Speaker jacks expand the device's versatility for various audio setups. A Headphone Jack allows for private listening.
- Portability: A built-in Handle and a Telescopic Antenna enhance its portability and radio reception. The Battery Compartment allows for mobile use.
- Voltage Selector: An AC Socket and a Voltage Selector ensure compatibility with different power standards globally.
Maintenance Features:
The manual provides detailed instructions for disassembly and alignment, crucial for servicing and maintaining the device.
- Disassembly Instructions: Step-by-step guidance is provided for removing various components, including the cassette compartment, front cabinet, dial scale, mechanism, circuit board, handle, and dial chassis. This facilitates access to internal components for repair or replacement.
- Measurements and Adjustments: Comprehensive alignment instructions are included for both the AM and FM-IF/RF sections, as well as audio adjustments.
- AM Alignment: Involves adjusting T2 (AM IFT), L4 (AM OSC Coil), L3 (AM ANT Coil), CT4 (AM OSC Trimmer), and CT3 (AM ANT Trimmer) for maximum output at specific frequencies (455 kHz, 550 kHz, 1500 kHz).
- FM-IF Alignment: Requires connecting a sweep generator and scope to adjust T1 (FM 1st IFT) and T3 (FM 2nd IFT) for maximum amplitude at 10.7 MHz.
- FM-RF Alignment: Involves adjusting L2 (FM OSC Coil), L1 (FM ANT Coil), CT2 (FM OSC Trimmer), and CT1 (FM ANT Trimmer) for maximum output at 90 MHz and 106 MHz.
- Separation Alignment: Adjusts VR4 for 19 kHz (±200 Hz) reading on an electronics counter at 98 MHz, 60 dB (CW) FM signal.
- Audio Adjustment: Includes azimuth adjustment (using an azimuth screw for maximum output with a 10 kHz, -20 dB QZZCFM signal), LED meter adjustment (VR5 for the first LED from the right to begin to fade out with a 315 Hz, 0 dB QZZCFM signal), and bias current adjustment (VR6 for 16±0.5 V with normal tape in record mode).
- Safety Notice: The manual highlights important safety considerations, emphasizing the use of manufacturer-specified parts for critical components in shaded areas of the schematic diagram to ensure protection from fire and electrical shock hazards.
- Parts Location Diagrams: Detailed diagrams for mechanism parts, electrical parts, and cabinet parts are provided, aiding in the identification and replacement of components.
- Circuit Board and Wiring Connection Diagram: A comprehensive diagram illustrates the layout of the circuit board and wiring connections, essential for troubleshooting and repair.
- Block Diagram: A block diagram provides an overview of the device's functional blocks, including radio, playback, recording, and power supply circuits.
- IC Block Diagrams: Detailed block diagrams for key integrated circuits (IC1 AN7213, IC2 AN7223, IC3 RVIBA1355, IC4 AN7310, IC5 RVIBA6133, IC6 RVIUPC1277H, IC7 RVIBA6154) are included, facilitating understanding of their internal functions.
- Replacement Parts List: A comprehensive list of replacement parts, including integrated circuits, transistors, diodes, variable capacitors, ceramic filters, component combinations, speakers, switches, jacks, thermistors, coils, transformers, resistors, capacitors, and cabinet parts, is provided with part numbers and descriptions.
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