CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”.

 

Criteria for Determination

Measure if unsatisfactory:

 

(Unsatisfactory if specified value is not satisfied)

 

 

 

 

 

Laser power check

• 0.9 mW power

• Clean the optical pick-up

(5-6-2 : See page 33)

Specified value : 0.84 to 0.92 mW

• Adjust again

 

• 7.0 mW power

• Replace the optical pick-up

 

Specified value : 6.8 to 7.2 mW

 

 

 

 

 

lop (at 7mW)

• Replace the optical pick-up

 

• Labeled on the optical pickup

 

 

Iop value ± 10mA

 

 

 

 

Traverse check

• Traverse waveform

• Replace the optical pick-up

(5-6-3 : See page 33)

Specified value : Below 10% offset

 

Focus bias check

• Error rate check

• Replace the optical pick-up

(5-6-4 : See page 34)

Specified value : For points a, b, and c

 

 

C1 error : Below 220

 

 

AD error : Below 2

 

C PLAY check

• Error rate check

• Replace the optical pick-up

(5-6-5 : See page 34)

Specified value:

 

 

a. When using test disc (MDW-74/AU-1)

 

 

C1 error : Below 80

 

 

AD error : Below 2

 

 

b.When using check disc (TDYS-1)

 

 

C1 error : Below 50

 

Self-recording/playback

• CPLAY error rate check

If always unsatisfactory:

check

Specified value:

• Replace the overwrite head

(REC/PLAY)

C1 error : Below 80

• Check for disconnection of the circuits around the

(5-6-6 : See page 34)

AD error : Below 2

overwrite head

 

 

If occasionally unsatisfactory:

 

 

• Check if the overwrite head is distorted

 

 

• Check the mechanism around the sled

TEMP check

• Unsatisfactory if displayed as T=@@ (##) [NG]”

• Check for disconnection of the circuits around D101

(Temperature

NG

(BD board)

compensation

(@@, ## are both arbitrary numbers)

• Check the signals around IC101, IC121, CN102,

offset check)

 

CN103 (BD board)

(5-6-1 : See page 33)

 

 

 

 

 

Note:

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.

When performing adjustments, use the specified values for adjustments.

FORCED RESET

The system microprocessor can be reset in the following procedure.

Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.

Procedure :

Press the S101 ( RESET button of the back panel) on the MAIN board.

[MAIN BOARD] (Component Side)

SET REAR PANEL

S101

S101

RESET button

13

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Sony HCD-MD373 Checks Prior to Parts Replacement and Adjustments, Forced Reset, Rec/Play, Main Board Component Side
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HCD-MD373 specifications

The Sony HCD-MD373 is a compact mini audio system that offers an impressive blend of sound quality, versatility, and advanced technology, making it an ideal choice for audio enthusiasts and casual listeners alike. One of the standout features of the HCD-MD373 is its MiniDisc recorder/player, a legacy technology that allows users to record high-quality audio onto MiniDiscs, providing an alternative to traditional CDs and cassettes. This feature is particularly appealing for those looking to capture live music or create personalized playlists.

Another notable aspect of the HCD-MD373 is its integrated CD player, which supports a variety of formats including CD, CD-R, and CD-RW. This versatility means that users can enjoy their favorite albums without the hassle of switching devices. The audio system also includes a built-in AM/FM tuner, enabling users to easily tune into their favorite radio stations and enjoy live broadcasts.

The HCD-MD373 is equipped with a powerful amplifier that delivers impressive sound output, complemented by its two-way speaker system. The speakers provide a rich audio experience with clear highs and deep lows, making it suitable for various music genres, from classical to contemporary. The system also features a bass boost function that enhances low-frequency sounds, allowing for a more immersive listening experience.

In terms of connectivity, the HCD-MD373 offers multiple inputs and outputs, including audio line-in, headphone jacks, and a digital optical output. These features make it easy to connect external devices such as MP3 players, smartphones, or even home theater systems. Additionally, the audio system supports various playback options, including shuffle and repeat modes, providing enhanced flexibility for users.

The design of the HCD-MD373 is sleek and modern, with a compact form factor that allows it to fit seamlessly into any living space. Its user-friendly interface, complete with an LCD display, makes it easy to navigate and control playback settings. Overall, the Sony HCD-MD373 is a testament to Sony's commitment to quality audio experiences, combining innovative features, robust technology, and elegant design into a single, powerful audio system. Whether enjoying a quiet evening at home or hosting a gathering with friends, the HCD-MD373 is sure to deliver satisfying sound and performance.
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