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

(6-2 : See page 24)

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

(6-3 : See page 24)

Specified value : Below 10% offset

 

 

 

 

Focus bias check

• Error rate check

• Replace the optical pick-up

(6-4 : See page 25)

Specified value : For points a, b, and c

 

 

C1 error : About 200

 

 

AD error : Above 00

 

 

 

 

C PLAY check

• Error rate check

• Replace the optical pick-up

(6-5 : See page 25)

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

(6-6 : See page 25)

C1 error : Below 80

• Check for disconnection of the circuits around the

 

AD error : Below 2

overwrite head

 

 

 

 

 

 

 

If occasionally unsatisfactory:

 

 

 

• Check if the overwrite head is distorted

 

 

 

• Check the mechanism around the sled

 

 

 

Temperature

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

• Check for disconnection of the circuits around

NG

 

D101 (BD board)

compensation

 

(@@, ## are both arbitrary numbers)

• Check the signals around IC101, IC121, CN102,

offset check

 

 

CN103 (BD board)

(6-1 : See page 24)

 

 

 

 

 

 

 

 

 

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.

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Sony MDS-JE630 Checks Prior to Parts Replacement and Adjustments, Criteria for Determination Measure if unsatisfactory
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MDS-JE630 specifications

The Sony MDS-JE630 is a compact and versatile MiniDisc recorder that was launched in the late 1990s, showcasing Sony's commitment to portable digital audio technology. Renowned for its superior sound quality, the MDS-JE630 is an exceptional choice for audiophiles and professionals alike, offering a user-friendly interface and a range of advanced features.

One of the main highlights of the MDS-JE630 is its MDLP (MiniDisc Long Play) technology, which allows for extended recording time without sacrificing audio quality. This feature enables users to record up to 148 minutes of stereo sound on a single MiniDisc, making it an invaluable tool for those requiring longer recording sessions, such as musicians or radio broadcasters.

The MDS-JE630 is equipped with ATRAC (Adaptive Transform Acoustic Coding) compression algorithms, ensuring that audio files retain high fidelity even when compressed. The device features a 20-bit digital-to-analog converter, providing remarkable sound clarity and depth. Users can expect crisp highs and robust lows, making every listening experience engaging and immersive.

Ease of use is another hallmark of the MDS-JE630. The front panel includes an intuitive layout, featuring a large LCD display that clearly shows current track information, time elapsed, and other playback indicators. Additionally, the unit offers various playback modes such as normal, repeat, and shuffle, allowing users to customize their listening experience.

The recording process on the MDS-JE630 is seamless, thanks to its one-touch recording feature. Users can easily initiate recordings from connected sources, including CD players or turntables, via the device's multiple inputs, such as line-in and optical digital inputs. This adaptability makes it a versatile component for any audio setup, whether for home studios or live performances.

Moreover, the MDS-JE630 incorporates a variety of editing functions, including track arranging, dividing, and merging, providing users with the ability to create perfectly curated audio collections. The device also supports a wide range of MiniDisc formats, ensuring compatibility with existing media.

In conclusion, the Sony MDS-JE630 stands out as a premier MiniDisc recorder, offering a blend of advanced technology, user-friendly design, and high-quality playback. Its innovative features and commitment to sound quality have made it a popular choice for music professionals and enthusiasts, solidifying its reputation as a reliable audio recording solution for years to come.
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