Sony MZ-R50 service manual KEY3

Page 38

Pin No.

Pin name

I/O

 

 

Description

 

 

 

 

 

 

51

AVREF

I

A/D converter reference voltage input.

 

 

 

 

 

 

52

AVDD

–

A/D converter power supply terminal.

 

 

 

 

 

 

53

AM3 MNT

I

AC adaptor or EXT battery detection input.

L : EXT battery

 

 

 

 

 

54

TEMP

I

Temp meter (IC803) input.

 

 

 

 

 

 

55

KEY3

I

PLAY/REC key input.

 

 

 

 

 

 

 

56

KEY4

I

Key input.

 

 

 

 

 

 

 

 

57

KEY0

I

Key input.

 

 

 

 

 

 

 

 

58

KEY1

I

Key input.

 

 

 

 

 

 

 

59

UNREG MNT

I

UNREG voltage monitor.

 

 

 

 

 

 

60

LIP MNT

I

Voltage monitor for lithium battery.

 

 

 

 

 

 

61

FG IN

I

FG input from motor driver (IC701).

 

 

 

 

 

 

 

 

62

SLA

I

JOG dial signal input.

 

 

 

 

 

 

 

63

SLB

I

 

 

 

 

 

 

 

 

 

 

 

64

INT SW

I

INITIAL switch input.

 

 

 

 

 

 

 

65

PACK IN

I

MEDIA switch input.

 

 

 

 

 

 

 

66

JACKDET

I

Input jack detection input.

 

 

 

 

 

 

67

OPT DET

I

Detecting input an optical input.

 

 

 

 

 

 

 

68

MIC DET

I

MIC jack detection.

 

 

 

 

 

 

 

 

69

XLAT

O

Latch output.

 

 

 

 

 

 

 

70

KEY ON

O

TRACK MARK jack input.

 

 

 

 

 

 

 

 

71

ST1 A

O

Stepping motor control signal output.

 

 

 

 

 

72

ST2 A

O

 

 

 

 

 

 

 

 

 

 

 

73

––––

 

–

Not used (Open).

 

 

 

 

 

 

 

74

––––

 

–

Not used (Open).

 

 

 

 

 

75

DQSY

I

Subcode Q sync (SCOR) of digital in U-bit CD format from IC503.

 

 

 

 

 

76

T COUNT

I

Traverse count signal input.

 

 

 

 

 

 

 

77

SDI1

I

Serial data input.

 

 

 

 

 

 

 

 

78

SDO1

O

Serial data output.

 

 

 

 

 

 

 

 

79

SCK1

O

Serial clock output.

 

 

 

 

 

 

 

80

SQSY

I

SUB-Q/ADIP SYNC input.

 

 

 

 

 

81

BEEP

O

BEEP sound output control. H : BEEP sound output

 

 

 

 

82

XLIP DET

I

This is at “L” level when using the lithium battery or with no sensor switch input.

 

 

 

 

 

83

REFLCT

I

CD/MO discrimination switch.

 

 

 

 

 

 

84

TEX

–

Not used (Fixed at “L”)

 

 

 

 

 

 

 

85

XT

–

Not used (Open).

 

 

 

 

 

 

 

 

86

VSS

–

Ground.

 

 

 

 

 

 

 

87

VDD

–

Power supply pin (+2.8V).

 

 

 

 

 

 

88

NC

–

Not used (Fixed at “H”)

 

 

 

 

 

 

 

89

XCS ADA

I

Chip select input.

 

 

 

 

 

 

 

90

XPD ADA

O

D/A converter power down detect during recording.

H : Power down

 

 

 

 

 

 

 

91

ST1B

O

Stepping motor control signal output.

 

 

 

 

 

92

ST2B

O

 

 

 

 

 

 

 

 

 

 

 

93

A MUTE

O

Analog mute control.

L : Mute

 

 

 

 

 

 

94

OPT CONT

O

Power supply control output for an optical input.

 

 

 

 

 

 

 

 

95

CS EVR

O

Chip select output.

 

 

 

 

 

 

 

96

CS NV

O

 

 

 

 

 

 

 

 

 

 

 

 

97

SCK2

O

Serial clock output.

 

 

 

 

 

 

 

98

–––––––

 

 

O HF module control output. (Not used : open)

 

 

 

 

 

 

99

SDO2

O

Serial data output.

 

 

 

 

 

 

 

 

100

XLIP

O

Charge control.

H : Charge

 

 

 

 

 

 

 

 

– 38 –

Page 37 Page 39
Image 38
Page 37 Page 39
Contents Specifications NEWDiagrams Table of ContentsDisassembly GeneralSection Servicing Note General Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Section Disassembly Upper Panel ASSY, Bottom Panel Assy RemovalMain Board Removal Mechanism Deck MT-MZR50-143 RemovalOptical PICK-UP ASSY, REC Board Removal CLV Board RemovalBattery Case Assy Removal Power BOARD, Switch Board RemovalSwitch Unit with JOG Dial Removal Test Mode Volume Servo ModeStructure of Servo Mode Adjusting Method Cluster DisplayAudio Mode Structuer of Audio ModePower supply Mode Mecha ModeStructure of Mecha Mode Structure of Power Supply ModeGeneral Adjustment Mode Structure of General Adjustment ModeSide B Section AdjustmentsSide a Laser Power Check Low Reflection CD Traverse Adjustment Adjustment Location Section Diagrams Pin No Pin name DescriptionAvss IC801 System Control CXP81960M-652R KEY3 MIC Block DiagramCircuit Boards Location Waveforms Schematic Diagram Main 1/3 SectionRefer to page 61 for IC Block Diagram Schematic Diagram Main 2/3 Section Refer to page 62 for IC Block DiagramsSchematic Diagram Main 3/3 Section Refer to page 64 for IC Block DiagramsIC Block Diagrams Main 1/3 Section IC501 CXA2523AR-T4 IC806 MB3800PNF IC Block Diagrams Main 2/3 Section IC804 DS1302ZIC506 MPC18A20VM IC802 RS5RJ29261 IC807 AK93C45AV-LIC Block Diagram Main 3/3 Section IC303 AK4515-VQ Section Exploded Views Upper PANEL, Bottom Panel SectionChassis Section 53 A-3293-759-A Switch BOARD, Complete55 A-3293-758-A Power BOARD, Complete 75 4-997-493-01 Spring LOCK,COMPRESSIONMotor Spindle Mechanism Deck Section124 4-972-546-01 Spring Worm GEAR,COMPRESSION Section Electrical Parts List CLV MainMain TantalumFerrite Bead ELEMENT, StorageDiode Inductor 0UHRES,CHIP Except FRMain Power Power REC Switch Sony Corporation
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MZ-R50 specifications

The Sony MZ-R50, launched in the late 1990s, is a notable model in the MiniDisc player genre, which revolutionized how consumers listened to music. Part of Sony's first generation of MiniDisc recorders, the MZ-R50 quickly gained popularity for its sleek design and innovative features.

One of the standout features of the MZ-R50 is its compact size and lightweight construction. It weighs just 160 grams, making it one of the most portable audio devices of its time. This portability paired with a stylish aesthetic allowed users to carry their music with ease, appealing to young, active lifestyles.

The MZ-R50 utilizes MiniDisc technology, which employs a small, flat disc encased in a protective shell. This format offers superior sound quality compared to cassette tapes, allowing for digital recording and playback. Users can record audio directly onto the disc in real-time or transfer music from CDs with ease. The player supports several recording modes, including LP2 and LP4, which allow users to maximize recording time without sacrificing quality.

Another significant feature of the MZ-R50 is its impressive battery life. It can run for up to 10 hours on a single charge, enabling long listening sessions without frequent recharging. The device also includes a digital pitch control, allowing users to change the tempo of tracks without affecting the pitch, which is especially useful for musicians and DJs.

Moreover, the MZ-R50 incorporates Sony's ATRAC (Adaptive Transform Acoustic Coding) compression technology. This advanced algorithm was designed to reduce the file size of audio while maintaining high sound fidelity, ensuring that music stored on MiniDiscs sounded close to the original recording. The player is compatible with both standard and long-play MiniDiscs, providing flexibility for users who want to store more music on a single disc.

In terms of connectivity, the MZ-R50 features an optical input for high-quality digital recording from other devices, along with a headphone output and a line out option for connecting to external speakers or audio systems. Its user-friendly interface allows for easy navigation through tracks and playlists, making it accessible for users of all ages.

Overall, the Sony MZ-R50 remains a beloved piece of audio technology, reflecting a unique combination of portability, sound quality, and user-friendly features, establishing its place in the history of personal music players. Its legacy continues to inspire later generations of audio enthusiasts.
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