This document describes the Panasonic RQ-V175 Stereo Radio Cassette Player, a portable audio device designed for both radio reception and cassette tape playback.
Function Description
The RQ-V175 is a versatile stereo radio cassette player that supports both AM and FM radio bands, as well as standard cassette tape playback. It features an auto-reverse function for continuous tape playback without needing to flip the cassette. The device incorporates Dolby Noise Reduction for improved audio quality during tape playback and an XBS (Extra Bass System) switch for enhanced bass response. A graphic equalizer allows users to customize the sound output. It can be powered by two UM-3, R6/LR6 batteries or an optional AC adaptor (RP-AC33).
Important Technical Specifications
General:
- Power Requirement: 3V DC (two UM-3, R6/LR6 batteries) or optional AC adaptor RP-AC33.
- Power Output: 40mW (20mW x 2) RMS (max.).
- Input: DC IN; 3V (φ3.4).
- Output: Headphones; 35Ω, φ3.5.
- Dimensions: 83.2(W) x 116.9(H) x 34.3(D) mm.
- Weight: Main Unit: 247g (without batteries); Headphones: 58g (with cord).
Radio Section:
- Radio Frequency Range: FM 87.5 - 108MHz; AM 520 - 1610kHz.
- Intermediate Frequency: FM 10.7MHz; AM 459kHz (E only) / 455kHz (EI only).
- Sensitivity: FM 3.6μV/0.5mW output (-3dB Limit, Sens); AM: 447μV/m/0.1mW output.
Tape Deck Section:
- Frequency Response: 30 - 18000Hz (Normal, Metal/CrO2).
- Tape Speed: 4.8cm/s.
- Program Time: 1 hour with C-60 cassette tape.
- Track System: 4-track, 2-channel, stereo playback.
Usage Features
The RQ-V175 offers a range of controls and features for user convenience:
- Playback Button (PLAY): Initiates tape playback.
- Fast Buttons (FAST): For fast-forward and rewind operations.
- Stop Button (■ STOP): Halts tape playback or radio operation.
- Direction Selector (DIR): Controls the tape playback direction for auto-reverse.
- Function Selector (SELECTOR): Switches between radio and tape functions.
- Tape Selector (TAPE): Likely for selecting tape type (Normal, Metal/CrO2) to optimize playback.
- Headphones Jack: Standard 3.5mm jack for private listening.
- Volume Control (VOLUME): Adjusts the audio output level.
- Band Selector (BAND): Switches between FM and AM radio bands.
- Tuning Control (TUNING): Dials in desired radio frequencies.
- Dolby Noise Reduction Switch/FM Sensitivity Selector (DOLBY NR/FM SENS): Engages Dolby NR for tape playback or adjusts FM sensitivity.
- FM Stereo Indicator (FM ST): Lights up when an FM stereo broadcast is received.
- XBS Switch (XBS): Activates the Extra Bass System for enhanced low-frequency sound.
- Graphic Equalizer Controls: Allows for manual adjustment of different frequency bands to tailor the sound.
- DC Input Jack (DC IN 3 V): For connecting an optional AC adaptor.
- Clip Receptacle: For attaching a belt clip for portability.
- Battery Compartment: Houses the two UM-3 batteries.
The device supports auto-reverse, indicated by the "AUTO REVERSE" label on the cassette lid, which simplifies tape listening. The "DOLBY SYSTEM" logo signifies the inclusion of Dolby noise reduction technology, licensed from Dolby Laboratories.
Maintenance Features
The manual provides detailed instructions for disassembly and alignment, crucial for servicing and maintenance:
Disassembly Instructions:
- Cassette Lid Removal:
- Open the cassette lid.
- Remove the cassette lid by pressing its rib with a screwdriver.
- Push the cassette lid in the direction of the arrow and disconnect the inside boss.
- Remove the spring (A).
- Cassette Lid Spring Replacement:
- Fit part Ⓐ on the shaft of the front cabinet.
- Insert part Ⓑ into the hole in the cassette lid.
- Fit the boss Ⓒ into the cassette lid.
- Removal of the Rear Cabinet: Involves removing screws and the rear cabinet.
- Removal of the Chassis and Circuit Board: Requires removing screws, disconnecting wires, and detaching the circuit board.
- Removal of the Cassette Holder & Graphic Equalizer PC Board: Involves removing screws and the PC board.
- Removal of the Front Cabinet and Mechanism: Requires removing screws and separating the front cabinet from the mechanism.
- Removal of Tuning Gear: Instructions for removing the dial pointer and tuning gear, emphasizing careful handling of the dial string.
Measurements and Adjustments:
The manual includes comprehensive alignment instructions for both AM-IF, AM-RF, FM-IF, and FM-RF sections, as well as tape deck measurements and adjustments. These sections detail the necessary equipment, test points, and procedures for ensuring optimal performance of the radio and tape functions.
- Radio Alignment: Specifies procedures for adjusting volume, function selector, tape selector, FM sense switch, and output power. It also details AM-IF, AM-RF, FM-IF, and FM-RF alignment points and expected readings.
- Tape Deck Section: Includes measurements for head azimuth adjustment, tape speed adjustment, and wow & flutter. It provides target values for standard speed and outlines procedures for adjusting the playback head and tape speed.
Parts Lists:
Detailed lists are provided for cabinet parts, resistors, capacitors, integrated circuits, transistors, diodes, coils, transformers, switches, and mechanical parts. These lists include part numbers and descriptions, facilitating the identification and replacement of components during repair. Mechanical parts are illustrated with exploded views for both front and rear perspectives, aiding in reassembly.
The manual concludes with a note that design and specifications are subject to change without notice, and that parts supplied by TAMACO are indicated.
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