Toshiba RT-200S - User Manual

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STEREO RADIO CASSETTE RECORDER

Summary

Specifications

Operating Controls

Control Functions

Details the function of each control button and lever on the device.

Block Diagram

Disassembly Instructions

Front Panel Removal

Instructions for removing the front panel of the cassette recorder.

Mechanism Assembly Removal

Steps for detaching the mechanism assembly from the main unit.

LED P.C. Board Assembly Removal

Procedure to remove the LED Printed Circuit Board assemblies.

Main P.C. Board Removal

Instructions for removing the main Printed Circuit Board.

Power P.C. Board Removal

Procedure for removing the power supply Printed Circuit Board.

Handle Removal

Dial Cord Restringing

Alignment Instructions

Test Equipment

Lists the necessary test equipment for performing alignment procedures.

AM Alignment

Detailed steps for aligning the AM radio frequency reception.

MW Alignment Chart

Chart outlining alignment steps and settings for MW band.

LW & SW Alignment Chart

Chart detailing alignment steps and settings for LW and SW bands.

FM-IF Alignment

FM-IF Alignment Chart

Chart for aligning the FM Intermediate Frequency stage.

FM-RF Alignment

FM-RF Alignment Chart

Chart for aligning the FM Radio Frequency stage.

Free Run Frequency Alignment

Record;Playback Head Adjustment

Take-Up;Supply Reel Tension

Mechanism Parts List

Cabinet Exploded View

Parts List

Cabinet Parts

List of replacement parts for the external cabinet components.

Transistors, ICs & Diodes

List of semiconductor components including transistors, ICs, and diodes.

Coils & Transformers

List of inductors and transformers used in the device.

Accessories

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The Toshiba RT-200S is a stereo radio cassette recorder designed for portable audio playback and recording. It combines a multi-band radio tuner with a cassette deck featuring auto-reverse functionality.

Function Description:

The RT-200S serves as a versatile audio device, allowing users to:

• Listen to Radio: Tune into various radio bands including FM, SW (Shortwave), MW (Medium Wave), and LW (Long Wave). The device features a tuning knob and a fine-tuning control for precise station selection, along with a tuning indicator and an FM stereo indicator.
• Play Cassette Tapes: Playback standard cassette tapes with stereo sound. The auto-reverse mechanism offers continuous playback without needing to flip the tape, with options for 1-cycle or continuous playback, and manual channel change. A tape counter and reset button are included for easy navigation.
• Record Audio: Record from the radio, built-in microphones, external microphones, or other audio equipment connected via the AUX input. The recording system uses AC bias (85 kHz) and AC erasing for quality recordings. A record key and pause key facilitate recording control.
• Mix Audio: Mix live sounds from an external microphone with sound from a played-back tape using the MIXING MIC jack.
• Output Audio: Connect to external speakers via the EXT SP jacks, or to headphones via the PHONES jack. It also provides LINE OUT jacks for connecting to another amplifier or tape deck for dubbing or amplification.
• Portability: Designed for portability, it can be powered by AC mains or DC batteries (8 x SUM-1 "D" size cells).

Important Technical Specifications:

• Cassette Tape Used: Normal (C-30, C-60, C-90, C-120), Chrome (C-45, C-60, C-90), Metal (C-46, C-60).
• Tape Speed: 4.8 cm/sec.
• Track System: Four-track two-channel stereophonic.
• Recording/Erasing System: AC bias (85 kHz) / AC erasing.
• Frequency Response:
  • Normal: 80 Hz to 10 kHz
  • Metal: 80 Hz to 12 kHz
• Receiving Frequency:
  • FM: 88 MHz to 108 MHz
  • SW: 5.9 MHz to 15.4 MHz
  • MW: 525 kHz to 1605 kHz
  • LW: 145 kHz to 270 kHz
• Intermediate Frequency:
  • FM: 10.7 MHz
  • LW, MW, SW: 460 kHz
• Antenna:
  • FM, SW: telescopic antenna
  • LW, MW: ferrite-core antenna
• Speakers: 120 mm (dia.) dynamic x 2 (woofers) and 40 mm (dia.) dynamic x 2 (tweeters).
• Jacks:
  • [MIC] jack x 2: Impedance 200 ohm to 2K ohm
  • [MIXING MIC] jack x 1: Impedance 200 ohm to 2K ohm
  • [AUX] jack x 2: Impedance 47K ohm
  • [LINE OUT] jack x 2: Impedance 4.7K ohm
  • [EXT SP] jack x 2: Impedance 3.2 ohm to 8 ohm
  • [PHONES] jack: headphone
• Power Supply: AC 220V to 240V, 50 Hz; DC 12V (SUM-1 "D" size x 8 batteries).
• Power Consumption: 18W.
• Dimensions (W x H x D): 455 x 258 x 118 mm.
• Weight: 3.9 kg (without batteries).

Usage Features:

• Controls: Features a comprehensive set of controls including a volume control, tone control, and selectors for band, function (Radio Off, Tape/Radio, AUX), and tape type (Metal/CrO2/Normal).
• Auto Reverse: Offers convenient auto-reverse functionality with selectable modes (1 cycle/continuous) and a manual channel change lever.
• Indicators: Includes a tuning indicator, FM stereo indicator, and battery indicator to provide feedback on operation status. Tape running indicators show the direction of tape movement.
• Built-in Microphones: Equipped with two built-in microphones for direct recording.
• Connectivity: Multiple input/output jacks allow for connection to external audio sources, microphones, speakers, and headphones, enhancing its versatility.
• Portability: The handle and battery compartment emphasize its design for use on the go.

Maintenance Features:

• Disassembly Instructions: Detailed steps are provided for removing the front panel, mechanism assembly, LED P.C. board assembly, main P.C. board, and power P.C. board for service.
• Handle Removal: Instructions for replacing the handle, including cutting the handle washer.
• Dial Cord Restringing: A step-by-step guide for restringing the dial cord, including setting the variable capacitor, dial drum, and adjusting the pointer.
• Alignment Instructions: Comprehensive alignment procedures for MW, LW, SW, FM-IF, and FM-RF bands, including required test equipment (signal generator, oscilloscope, test loop, dummy antenna, VTVM) and specific adjustment points (coils, trims).
• Free Run Frequency Alignment: Adjustment for R203 to obtain 38 kHz ±75 Hz under no signal condition.
• Record/Playback Head Adjustment: Instructions for adjusting forward and reverse azimuth using a 6.3 kHz standard tape, VTVM or oscilloscope, and a phillips screwdriver to achieve maximum output voltage.
• Take-Up/Supply Reel Tension: Procedure for checking and adjusting reel tension using a cassette torque meter, with specified torque values for PLAY and REWIND. Also includes advice to clean or replace the drive belt if necessary.
• Parts List: Detailed lists for cabinet parts, transistors, ICs, diodes, coils, transformers, resistors, and accessories, including part numbers and descriptions. Special attention is given to safety-critical components marked with a symbol.
• Exploded Views: Diagrams for the mechanism (upper and lower) and cabinet provide visual guides for component identification and assembly.

Toshiba RT-200S Specifications