SHARP MD-MT831-S
SHARP Portable MD Recorder MD-MT831-S User Manual
1. Introduction
This manual provides detailed instructions for the safe and efficient use of your SHARP Portable MD Recorder, model MD-MT831-S. Please read this manual thoroughly before operating the device and keep it for future reference.
Key Features:
- Compact and slim design for portability.
- Long continuous playback and recording times with the included Lithium-ion rechargeable battery.
- Convenient charging stand for easy recharging.
- Compatible with an optional Kanji display remote control.
- Supports optional PC/"Zaurus" link for enhanced functionality.

Image 1.1: The SHARP Portable MD Recorder MD-MT831-S. This image shows the compact silver unit with its display and control buttons.
2. Package Contents
Please check that all the following items are included in your package:
- MD Recorder Unit
- LCD Remote Control
- Headphones
- Lithium-ion Rechargeable Battery (AD-T51BT)
- AC Adapter
- Charging Stand
- AA Dry Cell Case (for optional AA alkaline battery)
- Connection Cable
- Hand Strap
- Carrying Case
- Instruction Manual (this document)
- Warranty Card
3. Setup
3.1. Battery Installation and Charging
The MD-MT831-S can be powered by the included Lithium-ion rechargeable battery or optional AA alkaline batteries using the provided dry cell case.
- Installing the Rechargeable Battery: Open the battery compartment cover on the back of the unit. Insert the Lithium-ion rechargeable battery (AD-T51BT) according to the polarity indicators. Close the cover securely.
- Charging the Rechargeable Battery:
- Using the Charging Stand: Place the MD recorder onto the charging stand. Connect the AC adapter to the charging stand and then to a power outlet. The charging indicator will illuminate. Charging time is approximately 4 hours.
- Direct AC Adapter Connection: Connect the AC adapter directly to the DC IN terminal on the MD recorder and then to a power outlet. Charging time is approximately 3 hours.
- Using AA Alkaline Batteries (Optional): Insert one AA alkaline battery (sold separately) into the dry cell case, observing the correct polarity. Connect the dry cell case to the unit's external power terminal.
3.2. Connecting Headphones and Remote Control
Connect the headphones to the headphone/remote control jack. If using the LCD remote control, connect it to the same jack, and then plug the headphones into the remote control's headphone jack.
4. Operating Instructions
4.1. Inserting an MD
Slide the OPEN switch to open the MD compartment. Insert a MiniDisc with the label side facing up until it clicks into place. Close the compartment cover.
4.2. Playback
- Insert an MD.
- Press the PLAY/PAUSE button to start playback.
- Use the SKIP buttons (|<< / >>|) to navigate between tracks.
- Adjust the volume using the VOLUME control on the unit or remote control.
- Press the STOP button to stop playback.
4.3. Recording
The MD-MT831-S supports recording from Line/Optical Digital input or Microphone input.
- Connect Audio Source:
- For Line/Optical Digital input: Connect your audio source (e.g., CD player, digital audio device) to the LINE/OPTICAL DIGITAL IN jack using the appropriate cable.
- For Microphone input: Connect a microphone (plug-in power compatible) to the MIC IN jack.
- Insert a blank or erasable MD.
- Press the REC button. The unit will enter recording standby mode.
- Start playback on your audio source (if applicable).
- Press the REC button again to begin recording. The recording indicator will light up.
- To stop recording, press the STOP button.
5. Maintenance
5.1. Cleaning the Unit
Wipe the exterior of the unit with a soft, dry cloth. For stubborn dirt, dampen the cloth with a mild detergent solution and then wipe with a dry cloth. Do not use abrasive cleaners, solvents, or alcohol, as they may damage the finish.
5.2. Battery Care
- If the unit will not be used for an extended period, remove the rechargeable battery and any dry cell batteries to prevent leakage and damage.
- Store batteries in a cool, dry place.
- Do not expose batteries to excessive heat or direct sunlight.
6. Troubleshooting
If you experience problems with your MD-MT831-S, please refer to the following table before seeking professional service.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on. | Battery is depleted or incorrectly installed. AC adapter not connected properly. | Charge the rechargeable battery or replace dry cell batteries. Ensure AC adapter is securely connected to unit/stand and power outlet. |
| No sound during playback. | Headphones not connected. Volume too low. MD not inserted correctly. | Connect headphones securely. Increase volume. Reinsert MD. |
| Cannot record. | MD is write-protected. Input source not connected or active. | Check the write-protect tab on the MD. Ensure audio source is connected and playing. Verify input sensitivity settings. |
| MD disc error. | Dirty or damaged MD. | Try a different MD. Clean the MD with a soft, lint-free cloth. |
7. Specifications
| Feature | Specification |
|---|---|
| Format | MiniDisc Digital Audio System |
| Recording Method | Magnetic Field Modulation Overwrite Method |
| Reading Method | Non-contact Optical Reading Method (using semiconductor laser) |
| Rotation Speed | Approx. 400-1,350 rpm |
| Error Correction Method | Advanced Cross Interleave Reed-Solomon Code (ARIRC) |
| Audio Compression/Expansion | ATRAC (Adaptive TRansform Acoustic Coding) 24-bit arithmetic method |
| Number of Channels | Stereo 2 channels / Monaural (long-play mode) 1 channel |
| Sampling Frequency | 44.1kHz (32kHz, 48kHz converted to 44.1kHz for recording) |
| Frequency Response | 20-20,000Hz (±3dB) |
| Wow and Flutter | Below measurement limit (±0.001% W.PEAK) |
| Input Terminals | Line/Optical Digital combined, Microphone (plug-in power compatible) |
| Output Terminals | Headphone (impedance 16Ω) / Remote control terminal combined |
| Input Sensitivity | MIC H: 0.25mV (10kΩ) / MIC L: 2.5mV (10kΩ) / LINE: 100mV (20kΩ) |
| Output Level | Headphone: Max 10mW+10mW (16Ω) / LINE: Rated 250mV (10kΩ) |
| Power Supply | DC3.6V (Li-ion battery), DC3.3V (AA dry cell), DC4.5V (Car adapter), DC5V (AC adapter) |
| Battery Life (Continuous Recording) | Li-ion: Approx. 9.5 hrs / AA: Approx. 4.5 hrs / Li-ion + AA: Approx. 14 hrs |
| Battery Life (Continuous Playback) | Li-ion: Approx. 14.5 hrs / AA: Approx. 11.5 hrs / Li-ion + AA: Approx. 26 hrs |
| Charging Time | Charging Stand: Approx. 4 hrs / AC Adapter: Approx. 3 hrs |
| External Dimensions (W x H x D) | 79.4mm x 17.9mm x 81.8mm |
| Weight | Approx. 163g (including rechargeable battery) |
| MDLP Support | Not supported |
8. Warranty and Support
8.1. Warranty Information
Your SHARP MD-MT831-S comes with a limited warranty. Please refer to the included warranty card for details regarding coverage, terms, and conditions. Keep your proof of purchase for warranty claims.
8.2. Customer Support
For technical assistance, service, or inquiries about your product, please contact SHARP customer support. Contact information can typically be found on the SHARP official website or on your warranty card.
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