Sony MZ-E90 service manual General, Setting the Test Mode, Test Mode Structure

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SECTION 4 TEST MODE

4-1. GENERAL

•When entered in the TEST MODE, this set provides the Overall Adjustment mode which allows CD and MO discs to be auto- matically adjusted. In the Overall Adjustment mode , the system discriminates between CD and MO discs, performs adjustments in sequence automatically, and displays the faulty location if any fault is found. In the Manual mode, selected adjustments can be performed automatically.

•The attached remote control is used to operate the TEST MODE. Unless otherwise specified in the text, the key means that on the remote control.

4-2. SETTING THE TEST MODE

4-2-1. How to set the TEST MODE

To set the TEST MODE, two methods are available.

1Solder bridge and short TAP801 (TEST) on the main board. Then turn on the power.

MAIN BOARD (SIDE B)

 

1

 

 

 

 

 

5

 

 

CN551

 

CN501

 

 

 

 

10

 

8

5

1

 

 

 

15

L501

 

 

 

 

 

 

TAP801

 

 

 

 

 

20

C518

TP518

 

 

 

 

 

 

TAP801

2In the normal mode, operate the keys on the set and those on the remote control as specified below:

Turn on HOLD switch on the set. Holding down x (STOP) key on the set, press the keys on the remote control in the following sequence:

>N t > N t . t . t > N t . t > N t . t X t X

4-2-2. Operations when the TEST MODE is set

When the TEST MODE is entered, the system switches to the display check mode within the TEST MODE. From this mode, the other Test modes can be accessed.

When the TEST MODE is set, the LCD repeats a cycle of the following displays:

Remote control LCD

888 u

All on

All off

004V1.100

Microprocessor version display

•Press and hold down PLAY MODE to hold the current display while the key is being pressed.

4-2-3. How to release the TEST MODE

When method 1 was used:

Turn off the power and open the solder bridge on TAP801 on the main board.

Note: The solder should be removed clean. The remaining solder may make a short with the chassis and other part.

When method 2 was used: Turn off the power.

4-3. TEST MODE STRUCTURE

Test Mode

(Display Check Mode)

+key

Manual Mode

xkey

+key Servo Mode

Audio Mode

Power Mode

key

OP Alignment Mode

key

Overall Adjustment Mode

xkey

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Contents Specifications LCX-2EFlexible Circuit Board Repairing MassTable of Contents Section Servicing Note General Page Panel ASSY, Upper Section DisassemblyHolder Assy Mechanism Deck Main BoardService ASSY, OP Test Mode Structure Test ModeSetting the Test Mode GeneralOverall Adjustment Mode Manual ModeHow to set the Manual mode Section Electrical Adjustments Reset NVOverall CD and MO adjustment items Overall CD adjustment items1. IC801 RU6915MF-0006 System Control Section DiagramsIC PIN Description Pin NoPin No Pin Name Description SLD VconMain Board 1/2 MD Section Block Diagrams MD Block DiagramServo SERVO, System Control Block Diagram Main Board 2/2L903 L902 Q901Q907 Q903Waveforms Modeplay OPEN/CLOSE Total Current Modeplay IC801 qj XINIC302 AK4352VT-E2 IC Block DiagramsIC501 SN761056DBT IC601 UPD63731GC-9EUIC552 IC602 MN41X17400CTT-10T1IC903 S-8328E20MC-EYA-T2 IC803IC551 IC802Section Exploded Views Main Unit SectionMechanism Deck Section MT-MZE60-169 Service ASSY, OP LCX-2ESPRING, Rack Section Electrical Parts List Main Diode UDZ-TE-17-5.1B DiodeDiode UDZ-TE-17-2.4B LED TLSU1002TPX1,SONY OperateSWITCH, KEY Board SwitchSWITCH, KEY Board N SWITCH, Slide AvlsSony Corporation

MZ-E90 specifications

The Sony MZ-E90 is a notable portable mini-disc player, emblematic of early 2000s technology that revolutionized how music was consumed. Launched during a time when CDs and cassette tapes were dominant, the MZ-E90 provided a compact solution for digital audio playback, embodying Sony's commitment to audio quality and portability.

One of the standout features of the MZ-E90 is its ability to record audio in real-time. Users can easily create their own mini-discs by recording tracks directly from a CD, vinyl, or even from the radio. This flexibility allowed music enthusiasts to curate personalized playlists on a single medium, which was a significant advantage over traditional physical formats.

The player utilizes Sony's ATRAC (Adaptive TRAnsform Acoustic Coding) compression technology, which enables high-quality sound reproduction in a space-efficient manner. The MZ-E90 supports MDLP (MiniDisc Long Play) mode, allowing users to store multiple albums on a single disc. This capability enhanced its appeal, especially for those with extensive music collections.

In terms of design, the MZ-E90 is compact and lightweight, making it easy to transport. The player features a user-friendly interface, equipped with a backlit LCD display that shows track information and playback status. The controls are intuitive, allowing users to navigate through their music selections effortlessly.

Battery life is another crucial aspect of the MZ-E90, offering long playback hours thanks to its efficient power management. This aspect made it a preferable choice for those on the go, as it ensured that users could enjoy their music for extended periods without frequent recharging.

Moreover, the MZ-E90 includes a headphone jack for private listening and features an integrated bass boost function that augments low-frequency sounds, enhancing the listening experience for those who enjoy richer audio. The use of high-quality components further ensures that the sound reproduction does justice to the original recordings.

While the Sony MZ-E90 may not have the mainstream recognition of today’s streaming platforms, it played a pivotal role in advancing portable digital music technology. Its combination of recording capabilities, sound quality, and portability made it a cherished device for audiophiles and casual listeners alike during its production run. The legacy of such devices remains evident in the evolution of portable music, paving the way for modern digital audio players and streaming services.
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