The Marantz SD 1030 Vintage HiFi Cassette Tape Deck is a classic audio component known for its performance and durability. Here are its typical technical specifications:

1. **Cassette Deck Features**:

   - Playback and Recording: Capable of playing and recording audio on standard compact cassette tapes.

   - Type: Likely a dual-capstan, direct-drive cassette deck for stable tape transport and accurate playback.

   - Tape Type Compatibility: Supports various cassette types such as Type I (normal), Type II (chrome), and Type IV (metal) tapes.

   - Tape Speed: Standard cassette tape speed of 1-7/8 inches per second (IPS).

2. **Audio Features**:

   - Head Configuration: Typically features multiple playback and recording heads for stereo operation and high fidelity.

   - Dolby Noise Reduction: May include Dolby B and/or Dolby C noise reduction for reducing tape hiss during playback.

   - Equalization: Supports various tape equalization standards such as NAB and IEC for optimal playback performance.

3. **Recording and Playback Controls**:

   - Transport Controls: Standard controls for play, pause, stop, fast forward, and rewind.

   - Recording Level Controls: Allows adjustment of recording levels for optimal signal-to-noise ratio.

   - Bias and EQ Selection: Allows selection of bias and equalization settings for different tape types.

4. **Connectivity**:

   - Analog Audio Inputs/Outputs: Typically includes RCA connectors for connecting to amplifiers, receivers, or other audio equipment.

   - Line Input/Output: Allows connection to external audio sources or recording devices.

   - Headphone Jack: Allows private listening with headphones.

5. **Display and Controls**:

   - VU Meters: Analog meters for visual monitoring of playback and recording levels.

   - Tape Counter: Digital or analog tape counter for tracking tape position.

   - Control Knobs and Buttons: Standard controls for operating the tape deck and navigating settings.

6. **Construction**:

   - Build Quality: Typically features a sturdy metal chassis and quality components for durability and longevity.

7. **Dimensions and Weight**:

   - Dimensions: Varies depending on the specific model but typically designed to fit in standard audio racks or shelves.

   - Weight: Varies based on construction and components used.

Regarding the condition mentioned:

- **Powers On, Tape Needs Servicing**: Indicates that the tape deck powers on but requires servicing for proper operation. This could include issues such as degraded belts, dirty heads, or other mechanical problems.

- **Spares or Repairs**: Indicates that the tape deck is being sold for parts or repair, rather than as a fully functional unit.