5-15. ADJUSTING POINTS AND CONNECTING POINTS

[BD (MD) BOARD] (SIDE A)

CN101

D101

CN110 GND

I+3V

IOP

TE

RF

VC

NOTE

IC171

[BD (MD) BOARD] (SIDE B)

IC101

IC121

IC192

NOTE:It is useful to use the jig. for checking the waveform. (Refer to Servicing Note on page 11.)

CD SECTION

Note:

1.CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given.

2.Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.Use an oscilloscope with more than 10MΩ impedance.

4.Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

S Curve Check

oscilloscope

BD (CD) board

 

TP (FE)

+

TP (VC)

–

Procedure :

1.Connect the oscilloscope to test points TP (FE) and TP (VC).

2.Connect TP (FEI) and Ground, and TP (AGCCON) and Ground of the BD board with lead wires.

3.Press the 1/u button to turn the set ON.

4.With the disc (YEDS-18) loaded, press the ^ (CD) button and perform focus search. (Focus search will be performed in the same way even while the disc table is pushed in and out.)

5.Check the symmetry and peak to peak level of the oscilloscope waveform (S curve) at this time.

S-curve waveform

symmetry

A

Within 4 ± 1 Vp-p

B

6. After check, remove the lead wire connected in step 2.

Note: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the bright- ness to obtain best waveform.

Checking Location : BD (CD) board

RF Level Check

oscilloscope

BD (CD) board

 

TP (RF)

+

TP (VC)

–

Procedure :

1.Connect oscilloscope to test point TP (RF) and TP (VC) on BD board.

2.Connect TP (AGCCON) and Ground of the BD (CD) board with lead wires.

3.Press the 1/u button to turn the set ON.

4.Put disc (YEDS-18) in and playback 5track.

5.Confirm that oscilloscope waveform is clear and check RF sig- nal level is correct or not.

6.After check, remove the lead wire connected in step 2.

Note: Clear RF signal waveform means that the shape “ ◊” can be

clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV

TIME/DIV : 500ns

level : 1.45 ± 0.3 Vp-p

Checking Location : BD (CD) board

E-F Balance (1 Track Jump) check

oscilloscope

BD (CD) board

 

TP (TE)

+

TP (VC)

–

Procedure:

1.Connect oscilloscope to test point TP (TE) and TP (VC) on BD (CD) board.

2.Press the 1/u button to turn the unit ON.

3.Put disc (YEDS-18) in to play the number five track.

4.Press the ^(CD) button.

5.Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform.

Confirm the following:

•A/B x 100 = less then ± 22 (%)

•B = 1.3 ± 0.6 Vp-p

1 track jump waveform

Center of the waveform

B

A (DC voitage)

0V

Symmetry

level : 1.3 ± 0.6 Vp-p

Checking Location : BD (CD) board

Checking Location : BD (CD) board [ BD (CD) BOARD ] — SIDE B —

TP (VC)

TP IC103 (RF)

TP (AGCCON)

TP (FE)

TP

(TE) TP (FEI)

39 39

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Sony HCD-MD373 Adjusting Points and Connecting Points, CD Section, Curve Check, RF Level Check, Balance 1 Track Jump check
Page 38 Page 40

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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