NAD C 542 service manual Troubleshooting Guide, Oscillating ? M101 SWITCH, Defective

Page 23

TROUBLESHOOTING GUIDE

SET POWER SWITCH TO ON.

IS POWER TURNED ON ?

YES

CAN TRAY BE OPENED ?

YES

CAN TRAY BE CLOSED ?

YES

NO

NO

NO

CHECK FUSES

 

 

NO

M507, M512-M514 OPEN ?

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M507,M512-M514 DEFECTIVE

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

IS THERE OPEN/ CLOSE KEY SIGNAL

 

 

 

 

INPUT ? U401 PIN 66, 65

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

CHECK OPEN/ CLOSE SIGNAL AT U401

 

NO

 

 

PIN 65

 

PIN 66

 

 

 

 

 

 

 

TRAY OPEN

 

H

 

L

 

 

 

TRAY CLOSE

 

L

 

H

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

IS LOADING MOTOR DRIVE CIRCUIT

 

 

 

 

OPERATION NORMAL ?

 

 

 

 

 

YES

 

 

 

 

 

 

 

CHECK POWER SUPPLY

 

NO

 

 

 

CIRCUIT NORMAL ?

 

 

YES

 

 

 

IS OSCILLATOR CIRCUIT

 

NO

 

 

 

OSCILLATING ?

 

 

 

 

 

 

M101 SWITCH, DEFECTIVE

OR PATTERN AND CONNECTOR OPEN.

MICROPROCESSOR IC U401 DEFECTIVE.

MOTOR DRIVE TRANSISTOR Q104, Q105, Q106, Q107 DEFECTIVE.

POWER SUPPLY PATTERNS OPEN

OR U501-U507 DEFECTIVE.

CRYSTAL X301 DEFECTIVE.

DOES INITIAL READING OCCUR ?

YES

CAN DISC BE PLAYED ?

YES

AUDIO OUTPUT IS CORRECT ?

YES

OK

NO

NO

NO

LOADING MOTOR AND LEAD WIRE DEFECTIVE OR LOADING PART OF MECHANISM DEFECTIVE.

NO

CHECK LASER LIGHT ?

YES

CHECK LASER CIRCUIT CORRECT ?

YES

CONNECTION OR PICKUP DEFECTIVE.

NO

NO

CHECK TRACKING SERVO CIRCUIT CORRECT ?

YES

CHECK DISC OR MECHANISM AND CONNECTOR

NO

IS POWER SUPPLY NORMALLY ?

YES

NO

CHECK CLOCK PULSE AT PIN4 OF U302

YES

NO CHECK OUTPUT PULSE AT PIN 61,62,63 OF U201

YES

NO

CHECK OUTPUT SIGNAL AT PIN 13,16 OF U302

YES

NO

CHECK OUTPUT SIGNAL AT PIN 1,7 OF U305, U306

YES

NO

CHECK MUTE CIRCUIT Q301, Q302, Q303, Q304

YES

LINE OUT PLUG OR PATTERNS DEFECTIVE.

DOES LENS MOVE UP AND DOWN ?

YES

RF SIGNAL OUTPUT ?

YES

FEED MOTOR OR WIRING DEFECTIVE.

U101 DEFECTIVE.

SERVO IC U101 OR U202 DEFECTIVE.

CHECK POWER SUPPLY PATTERNS.

M302 OR U302 DEFECTIVE.

IC U201 DEFECTIVE.

IC U302 DEFECTIVE.

IC U305 OR U306 DEFECTIVE.

MUTE CIRCUIT DEFECTIVE.

NO

U101 DEFECTIVE.

NO

CHECK FOCUS SIGNAL OUTPUT ?

YES

CHECK CONNECTION OR PICKUP.

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Image 23
Contents 542 Class Laser Product Safety InformationContents Service Safety PrecautionsControls SpecificationsPhysical Specifications Front Panel Rear Panel / Front PanelRear Panel Refer to Figure No.1 Disassembly InstructionsKeyboard Block DiagramWiring Diagram NAD C 542 PCB Testing Points Diagram Testing Procedure RF Pattern TestingInstruction for Handling Optical System Block PICK-UP Precautions for Checking Beam EmissionImportant Notes Precautions When Changing Laser PICK-UP Display Board KEY Board Live Board LED Board PCB LayoutMain Board MCU Schematic DiagramGND1 DisplayRF AMP Agnd DACOWE R U403 TC74HC00AP IC Block DiagramU101 CXA2581N U202 BA6392FPU201 CXD3017Q P64/INT4/SBUSY1/AN10 U301 M38B57MCU501, U506, U507 U302 PCM1732Main Board U402 Nadlink Masked Oscillating ? M101 SWITCH, Defective Troubleshooting GuideReference No Description Electrical Parts ListCapacitor LEDCoil WAFER/CONNECTORRelay JackCrystal ScrewDiode 1N4148 AT DiodeHeatsink TransistorWSL-2130CCM Mechanism Exploded ViewQty Mechanism Exploded View Parts ListExploded View Exploded View Parts List Screw M3X6 Description ’TY Packing DiagramNAD
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C 542 specifications

The NAD C 542 is a high-quality CD player that epitomizes NAD's commitment to delivering superior audio performance through innovative design and advanced technology. Designed for audiophiles and music enthusiasts alike, the C 542 stands out with its meticulous attention to detail, providing a rich listening experience that brings out the best in your CD collections.

One of the main features of the NAD C 542 is its high-performance digital-to-analog converter (DAC). The unit employs state-of-the-art circuitry that ensures accurate signal conversion, resulting in a dynamic range that captures the nuances of music more effectively. This allows listeners to experience depth and clarity in their audio that other CD players may not deliver.

The C 542 also incorporates NAD's proprietary technology known as "NAD's proprietary disc reading system." This feature enhances the player’s ability to read discs with precision, reducing errors that can arise from scratches or dirt. The result is more reliable playback and a seamless listening experience, even with older CDs that may have seen better days.

Another notable characteristic of the NAD C 542 is its ability to handle various disc formats. In addition to standard audio CDs, the player is compatible with CD-R and CD-RW formats, giving users the flexibility to enjoy their custom mixes. The C 542 also supports MP3 playback, allowing users to enjoy their digital music collections directly from discs.

The front panel of the C 542 is thoughtfully arranged for ease of use, featuring a bright display that provides essential information about track number, elapsed time, and disc status. Users can easily navigate through their tracks with a responsive remote control, which enhances usability and makes listening more enjoyable.

In terms of build quality, the NAD C 542 boasts a solid construction, which minimizes vibrations that can affect sound quality. This attention to detail in the physical design reinforces NAD's philosophy of creating products that perform exceptionally well while remaining durable over time.

In summary, the NAD C 542 is an exceptional CD player that combines advanced technologies, user-friendly features, and robust build quality. With its impressive DAC, proprietary reading system, and compatibility with multiple disc formats, it caters to the needs of discerning listeners who demand high fidelity and reliability in their audio equipment. Whether you are revisiting classic albums or enjoying modern recordings, the C 542 truly enhances your listening experience.