Sony MZ-E900 specifications Res NV CC, Res OK?, 021 Res, Reset, VclPWM

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MZ-E900

SECTION 5

ELECTRICAL ADJUSTMENTS

5-1. GENERAL

In this set, CD and MO discs can be automatically adjusted by set- ting the Overall Adjustment mode within the TEST MODE, Before performing these automatic adjustments, it is necessary to clear the memory and adjust the power in the Manual mode.

5-2. NOTES FOR ADJUSTMENT

5-2-1. Jigs

 

CD disc

TDYS-1 (part code: 4-963-646-01)

MO disc

PTDM-1 (part code: J-2501-054-A)

 

 

or commercially available MO disc (recorded)

Digital voltmeter

5-2-2. Adjustment sequence

The adjustments should be always performed in the following sequence:

1Reset NV (Clear the memory)

Manual mode

2Manual power adjustments

3Electrical offset adjustments (Do not enter the disc)

4 Overall CD adjustments

Overall adjustment mode

5Overall MO adjustments

6RESUME clear

5-2-3. Power

The power is supplied with 1.5 V DC from the battery case.

5-3. RESET NV

5-3-1. How to reset NV

1.Set the TEST MODE.

2.Set the Manual mode and set the item No. 021, Reset NV. LCD display

021 Res NV CC

3.Press X key on the remote control. LCD display

021 Res OK?

4.Press X key on the remote control again. LCD display

021 Res ***

After reset is completed.

021Reset!

5.Press x key to terminate the Manual mode and return to the

TEST MODE.

5-4. MANUAL POWER ADJUSTMENTS

5-4-1. Adjustment sequence

The adjustments should be always performed in the following se- quence:

1Vc PWM Duty (L) adjustment (item No.:762)

r

2 Vc PWM duty (H) adjustment (item No.:763) r

3 Vl PWM Duty adjustment (item No.:764)

5-4-2. Vc PWM Duty (L) adjustment method

1.Confirm that the power voltage is at 1.5 V DC.

2.Set the TEST MODE.

3.Set the overall adjustment mode and press PLAY MODE key, item No. will change to 762.

LCD display

762 VclPWM XX

4.Connect a digital voltmeter to TP901 (VC) on the main board and adjust + key (voltage up) and – key (voltage down) on the remote control.

Adjustment value:2.36V

Standard value:2.35 to 2.365V

MAIN BOARD (SIDE A)

 

D903

R903

 

28

25

 

20

15

 

 

 

C905

29

 

 

 

 

 

14

 

30

 

 

IC901

 

 

R901

 

 

 

10 C918

C920

35

 

 

 

 

 

 

R920

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

R921

C919

40

 

 

 

 

 

 

 

42

 

 

 

 

 

1

 

 

 

 

 

 

 

 

C911

43 45

 

 

50

55 56

 

R950

C917

C915

 

 

 

 

 

 

R946

R948

TP901 (VC)

 

 

 

 

 

 

 

 

digital voltmeter

TP901 (VC)

5. Press X key to write the adjustment value. Item No.will change

to 763.

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Contents MZ-E900 SpecificationsSection Servicing Note General Mechanism Deck Section DisassemblyLID ASSY, UPPER, Holder Assy Bracket R Assy Audio BoardOptical PICK-UP Assy Main BOARD, Bracket L ASSY, SW BoardHow to release the Test Mode Section Test ModeSetting the Test Mode How to set the Test Mode011 063B01 Manual011 C68S01 OFFJ01001 1 Adrs Clearing the error display code000 FF 0F 000 P**P##000 P**R00 000 EIB Stat Adrs BEmp 000 ###### 000 0F021 Res ResetRes NV CC Res OK?OfstOK VchPWMAssy11 OfstRes Clr MO OKResume CC 043 ResMZ-E900 Section DiagramsBlock Diagrams Semiconductor Location Printed Wiring Boards Main /2Refer to page 22 for Notes Main Board IC B/D Schematic Diagram Main /2 Audio Board Side a Printed Wiring Boards Audio SectionSchematic Diagram Audio Section Waveforms IC Block DiagramsIC551 SC111257FCR2 IC901 XPC18A32FCR2 Main Section Exploded Views5961 Mechanism Deck Section MT-MZE900-173Audio Main Section Electrical Parts ListMain CN501 1-794-772-21 CONNECTOR, FPC ZIF 20PComposition Circuit Block Main SW501 502 507 Ver Date Description of Revision Revision History

MZ-E900 specifications

The Sony MZ-E900, released in the early 2000s, represents a remarkable convergence of portable music technology and user-friendly design. As a MiniDisc player, the MZ-E900 was part of Sony's efforts to create a new standard in digital audio storage, allowing users to record, erase, and edit audio with unparalleled ease.

One of the standout features of the MZ-E900 is its compact and lightweight design, making it an ideal companion for music lovers on the go. Weighing in at approximately 150 grams, it is particularly portable and can easily fit into a pocket or bag. The sleek exterior is both stylish and functional, with an intuitive interface that facilitates easy navigation through a user-friendly menu.

Technologically, the MZ-E900 was equipped with Sony's ATRAC (Adaptive Transform Acoustic Coding) audio compression technology, which delivered impressive sound quality while minimizing file sizes. This allowed users to fit more music onto a single MiniDisc, which could hold up to 80 minutes of high-quality audio in LP2 mode. Additionally, the player supported 24-bit digital-to-analog conversion, ensuring a rich and detailed listening experience.

Another notable feature is the MZ-E900's ability to record audio directly from various sources, such as FM radio or external devices, thanks to an integrated microphone and line-in capabilities. The unit also supported a range of playback modes, including shuffle and repeat functions, giving users greater flexibility in how they enjoy their music.

The MZ-E900 also boasted an impressive battery life, with the ability to play up to 40 hours on a single AA battery, making it perfect for long journeys or extended listening sessions. The inclusion of an ergonomic remote control further enhanced the user experience, allowing for convenient operation while on the move.

In terms of connectivity, the device included a small but versatile digital output, enabling users to connect to other audio equipment such as amplifiers or sound systems. This feature contributed to the versatility of the MZ-E900, allowing it to serve not just as a portable player, but as a component in a larger audio setup.

Overall, the Sony MZ-E900 stood out for its combination of portability, sound quality, and innovative features, making it a beloved device among audiophiles and casual listeners alike during its time. Its legacy remains a testament to Sony's commitment to advancing portable audio technology.