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This document provides a comprehensive service manual for the SHARP CD-C405W, CD-C420H, CP-C410, CP-C405, and CP-SR421 audio systems. It covers various aspects from general operation and component identification to detailed disassembly, adjustment, and troubleshooting procedures, ensuring that users and service technicians can effectively manage and maintain these devices.
The core function of these models revolves around a multi-play compact disc player, an amplifier, a tuner, and a cassette deck, offering a versatile audio experience. The CD player is designed for 3-disc multi-play, allowing for extended listening without interruption. The amplifier section provides the necessary power output for the connected speakers, while the tuner section enables reception of FM and AM radio broadcasts across specified frequency ranges. The cassette deck supports both playback and recording, accommodating normal tapes. The system is designed to deliver a complete home audio solution, integrating multiple playback and recording functionalities into a single unit.
For ease of use, the front panel of the main unit (CD-C405W/CD-C420H) features a disc tray, various indicators such as disc number, timer, record, sleep, and extra bass (X-BASS), along with a function/CD track/CD counter/frequency/preset channel/volume/timer/sleep time indicator. It also includes specific indicators for FM stereo mode, CD play, CD repeat, and CD pause. Control buttons are provided for power, extra bass/equalizer mode, volume up/down, random/demo, clock, timer/sleep, function selection, memory/set, tuning and time up/down, track down/review/preset down, play/repeat, stop, track up/cue/preset up, disc skip, open/close, and record pause. A headphone socket is also available for private listening. The cassette compartments for TAPE 1 and TAPE 2 are clearly marked.
The rear panel of the CD-C405W includes video/auxiliary (audio signal) input sockets, speaker terminals, an AC voltage selector, an AC power lead, a span selector switch, FM 75 ohms aerial terminal, aerial earth terminal, and an AM aerial terminal. The CD-C420H rear panel is similar, featuring speaker terminals, an AC power lead, video/auxiliary (audio signal) input sockets, an FM 75 ohms aerial socket, and an AM loop aerial socket.
The speaker systems vary across the models. The CP-C405 features a 2-way type speaker with a woofer and a super tweeter. The CP-C410 is a full-range speaker, while the CP-SR421 serves as a rear speaker, also featuring a full-range type. These different speaker configurations allow for flexibility in setting up a stereo or surround sound environment.
A remote control is provided for convenient operation of the CD-C405W/CD-C420H units. It includes an infrared transmitter LED and dedicated sections for CD control, tuner control, tape control, and general system functions. CD control buttons include disc number select, track down/review, track up/cue, disc skip, play/repeat, stop, memory, clear, random, and pause. Tuner control offers preset up/down buttons. Tape control includes stop, play, record pause, rewind, and fast forward for both TAPE 1 and TAPE 2. General system controls include function selector, extra bass/equalizer mode, power, and volume up/down.
The manual also details important setup procedures, such as setting the clock. This involves entering standby mode, pressing the clock button, and then using the memory/set and tuning/time buttons to adjust the hour and minutes. The system supports both 24-hour and 12-hour display formats. Instructions are also provided for resetting the microcomputer, which is useful for erasing stored memory contents or resolving display/operation issues. This reset procedure involves a specific sequence of button presses while in standby mode.
Maintenance features are extensively covered, particularly regarding disassembly and reassembly. The manual emphasizes caution during disassembly, advising users to remove cassette tapes and compact discs, disconnect the power supply, and carefully manage nylon bands and wire holders. Special attention is drawn to handling integrated circuits and other sensitive components to prevent damage from static electricity. Detailed steps are provided for removing the top cabinet, side panels, CD player unit/CD tray cover, back board, main PWB/display PWB/headphone PWB, front panel, tape mechanism, turntable, disc tray, CD changer mechanism, and CD mechanism. Specific instructions are also given for manually opening the CD changer. For the speaker units (CP-C410, CP-SR421, CP-C405), steps for removing the front panel and screws to access the speaker components are outlined.
Further maintenance includes instructions for removing and reinstalling main parts of the CD mechanism, such as the loading motor, turntable up/down motor, and the pickup unit. These procedures are critical for servicing specific components of the CD player.
Adjustment procedures are detailed for both the mechanism and tuner sections. For the mechanism section, a "Driving Force Check" is described, involving the use of a torque meter to measure play, fast forward, and rewind torque for the cassette deck, ensuring it meets specified values. Tape speed adjustment is also covered, using a test tape and measuring volume in the motor to achieve the correct frequency.
The tuner section adjustment includes procedures for AM IF/RF and FM Mute Level. For AM IF/RF, signal generators are used to modulate signals at specific frequencies, and adjustments are made using designated parts (e.g., T351, T302) to achieve desired voltage outputs. The manual specifies different procedures for CD-C405W and CD-C420H models. For FM Mute Level, a signal generator is used to modulate an FM signal, and adjustments are made to VR351 to ensure an output signal appears at a specified frequency. The "Setting the Test Mode" feature allows technicians to enter a special mode by pressing specific buttons, which pre-sets frequencies in memory for easier adjustment and checking of the tuner circuit.
The CD section highlights automatic adjustment functions, meaning that when the pickup is replaced, manual readjustment is generally not necessary. This includes automatic adjustments for focus offset, tracking offset, E/F balance (tracking error balance), RF level AGC function, and RF level automatic follow-up of the tracking gain. These adjustments are performed automatically each time a disc is changed, ensuring optimal playback settings.
Schematic diagrams and wiring side views of the P.W.Boards are provided, along with notes on interpreting resistor and capacitor units, and voltage measurements. The manual also includes a comprehensive list of switches and their functions, as well as a diagram of transistor types used in the device. Safety is a paramount concern, with specific parts marked as important for maintaining the safety and performance of the set, emphasizing the use of identical replacement parts.
Troubleshooting guides are included for the CD changer control and CD section, providing systematic steps to diagnose and resolve common issues. A function table of ICs and details on FL display are also provided to assist in deeper diagnostics and repair. The replacement parts list and exploded view diagrams offer visual aids and part numbers for ordering specific components, facilitating efficient repairs and maintenance.
General| CD Player | Yes |
|---|---|
| FM Radio | Yes |
| Bluetooth | No |
| USB Port | No |
| Speaker Configuration | 2.0 |
| Dimensions | 400 x 250 x 210 mm |
| Weight | Not found |
| CD Changer | No |
| Remote Control | Yes |
| Cassette Deck | No |
| Power Output | 40 W |
| Tuner | FM |
