Brand: SAMSUNG
Category: Other
Document Type: Parts/Service
Language: EN
Parts/Service for RCD-750
Uploaded: Nov. 21, 2025, 8:18 p.m.
Basic Circuit Operation
5-1. Description of LCD segments
This section details the operation of the LCD segments used in the RCD-750, showing how different combinations form characters and symbols.
5-2. CDP basic circuit operation
This section outlines the basic operation of the Compact Disc Player (CDP) section:
- CDP block diagram: Illustrates the main components including the Optical Pick-up Unit (PU), RF Amplifier, Digital Signal Processor (DSP), and Audio sections.
- Optical Pick-up Unit: Detects signals on the disc using a laser beam.
- RF Amplifier: Amplifies signals from the pick-up.
- Focus and Tracking Servo: Controls the objective lens for accurate reading of disc data.
- DSP: Processes the EFM signal, performs error correction, and manages data.
- D/A Converter: Converts the digital signal to an analog signal for the pre-amplifier.
5-3. IC pin description
Provides detailed pin descriptions for the KS56C220 IC, including input/output functions and reset conditions.
Troubleshooting and error codes
| Section | Troubleshooting Item | Possible Cause | Solution |
|---|---|---|---|
| 5. Basic circuit operation | LCD segments not displaying correctly | Faulty IC, poor connection, damaged LCD | Check IC, connections, replace LCD if necessary |
| CD not playing / skipping | Dirty disc, faulty laser, motor issue, servo error | Clean disc, check laser, motor, and servo systems | |
| No sound / distorted sound | Faulty audio amplifier, D/A converter issue, speaker problem | Check audio amplifier, D/A converter, and speakers | |
| 6. Troubleshooting (Refer to page 26-30) | Detailed troubleshooting steps for various issues including no power, tape playback problems, radio reception issues, and CD playback errors. (Consult specific pages for details.) | ||