Sony MZ-G755 Service Manual
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Sony MZ-G755 Service Manual

Fm/am portable minidisc recorder
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SERVICE MANUAL
Ver 1.0 2002. 04
Ver 1.0 2001. 01
US and foreign patents licensed
from Dolby Laboratories.
The CE mark is valid
only for products
marketed in the
European Union.
MD recorder
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs MQW
Wavelength: λ = 790 nm
Emission duration: continuous
Laser output: less than 44.6 µW
(This output is the value measured at a
distance of 200 mm from the lens surface
on the optical pick-up block with 7 mm
aperture.)
Recording and playback time
When using MDW-80
Maximum 160 min. in monaural
Maximum 320 min. in stereo
Revolutions
350 rpm to 2,800 rpm (CLV)
Error correction
ACIRC (Advanced Cross Interleave Reed
Solomon Code)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Coding
ATRAC (Adaptive TRansform Acoustic
Coding)
ATRAC3-LP2
ATRAC3-LP4
Sony Corporation
9-873-965-01
2002D0400-1
Personal Audio Company
© 2002. 04
Published by Sony Engineering Corporation
MZ-G755
Model Name Using Similar Mechanism
Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, minimum
input level 0.35 mV
Line in: stereo mini-jack, minimum input
level 49 mV
Optical (Digital) in: optical (digital) mini-
jack
Outputs
i: stereo mini-jack, maximum output level
5 mW + 5 mW, load impedance 16 ohm
Radio
Frequency range
AM: 531-1,602 kHz
FM: 87.5-108.0 MHz
FM/AM PORTABLE MINIDISC RECORDER
AEP Model
UK Model
E Model
Australian Model
Tourist Model
MZ-G750/R700
MT-MZR700-172
LCX-4R
General
Power requirements
Sony AC Power Adaptor (supplied*)
connected at the DC IN 3 V jack:
230 V AC, 50/60 Hz (AEP, FR, CET
model)
240 V AC, 50 Hz (Australian model)
230-240 V AC, 50 Hz (UK, HK model)
110/220 V AC, 60 Hz (Korean model)
100-240 V AC, 50/60 Hz (E, JE model)
Nickel cadmium rechargeable battery
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
*) Except for Korean model
• Abbreviation
FR
: French model
CET : East European & CIS model
JE
: Tourist model
HK : Hong Kong model
– Continued on next page –
1

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  • Page 1 Audio playing system EFM (Eight to Fourteen Modulation) Power requirements MiniDisc digital audio system Number of channels Sony AC Power Adaptor (supplied*) Laser diode properties 2 stereo channels connected at the DC IN 3 V jack: Material: GaAlAs MQW 1 monaural channel 230 V AC, 50/60 Hz (AEP, FR, CET Wavelength: λ...
  • Page 2 Measured value by the standard of JEITA (Japan Electronics and Information Technology Industries Association). When using a 100% fully charged rechargeable battery. When using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). Recording time may differ according to the alkaline batteries.

  • Page 3: Table Of Contents

    MZ-G755 TABLE OF CONTENTS 1. SERVICING NOTE 5. ELECTRICAL ADJUSTMENTS ............4 5-1. Outline ................18 5-2. Precautions for Adjustment ..........18 2. GENERAL 5-3. Adjustment Sequence ............18 Looking at the controls ............5 5-4. NV Reset ................18 5-5.

  • Page 4: Servicing Note

    MZ-G755 SECTION 1 SERVICING NOTE • In performing the repair with the power supplied to the set, NOTES ON HANDLING THE OPTICAL PICK-UP removing the MAIN board causes the set to be disabled. BLOCK OR BASE UNIT In such a case, fix a convex part of the open/close detect switch The laser diode in the optical pick-up block may suffer electro- (S806 on MAIN board) with a tape in advance.

  • Page 5: General

    MZ-G755 SECTION 2 GENERAL This section is extracted from instruction manual. See pages in ( ) for more details. SELECT CHARGE Character information REC indication (14) display (34)(39) Lights up while recording. Displays the disc and track When flashing, the recorder names, error messages, track is in record standby mode.

  • Page 6: Disassembly

    MZ-G755 SECTION 3 DISASSEMBLY Note : This set can be disassemble according to the following sequence. 3-4. MAIN BOARD 3-1. BOTTOM PANEL ASSY (Page 8) (Page 6) 3-5. MD MECHANISM DECK (Page 8) 3-2. UPPER PANEL ASSY (Page 7) 3-6.

  • Page 7: Upper Panel Assy

    MZ-G755 3-2. UPPER PANEL ASSY 2 MI screws (1.4x2.0) 4 CN804 3 upper panel assy 1 MI screws (1.4x2.0) 3-3. LCD MODULE 2 screws (1.7x2.5) 1 screws (1.7x2.5) 4 LCD module claws upper panel (B) sub assy...

  • Page 8: Main Board

    MZ-G755 3-4. MAIN BOARD 8 CN501 4 screws (M1.7x3) 6 Remove the solders. 2 arm 3 screws (M1.4x2) qa Remove the solder. qd MAIN board 5 screws (M1.4x2) 9 Remove the solder. 1 CN502 qs battery coil spring q; battery case assy 3-5.

  • Page 9: Op Service Assy

    MZ-G755 3-6. OP SERVICE ASSY 1 washer (0.8 - 2.5) 5 precision pan screw (M1.4) 3 precision pan screw 2 gear (SA) (M1.4) 6 thrust detent spring 8 Pull off the lead screw. 4 rack spring (s) 9 Opening the over write head...

  • Page 10: Motor Flexible Board

    MZ-G755 3-8. MOTOR FLEXIBLE BOARD 1 Remove four solders of DC motor (sled) (M602). 2 Remove two solders of DC motor (over write head up/down) (M603). 3 Remove four solders of 4 adhesive sheet DC motor (spindle) (M601). Note: Align a circular hole in the stripping paper...

  • Page 11: Dc Motor (M601), Dc Motor (M603)

    MZ-G755 3-10. DC MOTOR (M601), DC MOTOR (M603) 1 Remove six solders of motor flexible board. Note: Press-fit the gear (HA) up to the qs DC moter (over write head up/down) position of the DC motor (over write (M603) head up/down) (M603) as shown below.

  • Page 12: Test Mode

    MZ-G755 SECTION 4 TEST MODE 4-1. Outline 4-3. Operation in Setting the Test Mode • This set provides the Overall adjustment mode that allows CD • When the test mode becomes active, first the display check mode (PB) and MO (REC/PB) disk to be automatically adjusted when is selected.

  • Page 13: Configuration Of Test Mode

    MZ-G755 4-5. Configuration of Test Mode VOL + key: 100th Place of item number Major Item Switching increase. Test Mode (Display Check Mode) VOL – key: 100th Place of item number Press the > or VOL + key. decrease. N key...

  • Page 14: Overall Adjustment Mode

    MZ-G755 5. The display changes a shown below each time the 4-8. Self-diagnosis Result Display Mode [ENTER] key on the set is pressed. This set uses the self-diagnostic function system in which if an error occurred during the recording or playing, the mechanism...

  • Page 15: Result The Error Display Code

    MZ-G755 • Description of error indication codes Problem Indication code Meaning of code Simple display Description No error No error No error Illegal access target Adrs Attempt to access an abnormal address address was specified Servo system error High temperature...

  • Page 16: Sound Skip Check Result Display Mode

    MZ-G755 4-10. Sound Skip Check Result Display Mode • Cause of sound skip error This set can display the count of errors that occurred during the Cause of error Description of error recording/playing for checking. Sound error correction error • Setting method of sound skip check result display...
  • Page 17 MZ-G755 4. When all the keys on the set and on the remote commander are considered as OK, the following displays are shown for 4 sec- onds. Example1: When the keys on the set are considered as OK: This set LCD display...

  • Page 18: Electrical Adjustments

    • CD disc TDYS-1 (Check MD disc) (Part No. : 4-963-646-01) This set LCD display • MO disk (SONY MD disc available on the market) 0 21 • Digital voltmeter • Laser power meter LPM-8001 (Part No. : J-2501-046-A) NV reset (after several seconds) •...

  • Page 19: Power Supply Manual Adjustment

    MZ-G755 3) Press the key to write the adjusted value. • Adjustment method of Vc PWM duty (L) 4) Select the manual mode of the test mode, and set item number (item number: 762) 862 (see page 13). This set LCD display...

  • Page 20: Temperature Correction

    MZ-G755 1. Connect a digital voltmeter to the TP902 (VL) on the MAIN 2. Press the key continuously until the optical pick-up [VOL +] [VOL --] board, and adjust key (voltage up) or moves to the most inward track. (voltage down) so that the voltage becomes 2.30 ± 0.01 V.

  • Page 21: Overall Adjustment Mode

    MZ-G755 Adjustment/checking and Connection Location: 5-8. Overall Adjustment Mode • Configuration of overall adjustment –MAIN BOARD (SIDE A)– . key Overall Adjustment Mode (Title Display) N key Protect switch CD Overall Adjusting NG item exists All item or x key...
  • Page 22 MZ-G755 • Overall adjustment mode (Title display) • Adjustment method of overall CD and MO adjustment mode This set LCD display 1. Setting the test mode (see page 12). 0 00 [VOL --] Assy 2. Press the key activates the overall adjust- ment mode.
  • Page 23 MZ-G755 • Overall CD and MO adjustment items 1. Overall CD adjustment items Item No. Description CD electrical offset adjustment CD tracking error gain adjustment CD TWPP gain adjustment CD tracking error offset adjustment CD ABCD gain adjustment CD focus gain adjustment...

  • Page 24: Diagrams

    MZ-G755 SECTION 6 DIAGRAMS 6-1. IC PIN DESCRIPTIONS • IC501 SN761057ADBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin Name Description Tracking error signal output to the system controller (IC801) REXT — Connect terminal to the external resistor for ADIP amp control WPP-LPF —...
  • Page 25 MZ-G755 • IC801 CXD2674-204GA (SYSTEM CONTROLLER, DIGITAL SIGNAL PROCESSOR, 16M BIT D-RAM) Pin No. Pin Name Description PAUSE KEY PAUSE key signal input terminal (A/D input) Control signal output to the microphone amp MIC SENSE “H”: HIGH, “L”: LOW, normally: “H”...
  • Page 26 MZ-G755 Pin No. Pin Name Description AVD2 — Power supply terminal (for the analog) (+2.4 V) AVS2 — Ground terminal (for the analog) ADRB A/D converter the lower limit voltage input (fixed at “L” in this set) Sled error signal input terminal Not used (fixed at “L”)
  • Page 27 MZ-G755 Pin No. Pin Name Description Sled motor drive signal output (W) to the motor driver (IC551)/drive control signal SLDW output (2+) SLCU Spindle motor drive comparison signal input (U) from the motor driver (IC551) SLCV Spindle motor drive comparison signal input (V) from the motor driver (IC551)
  • Page 28 MZ-G755 Pin No. Pin Name Description Open/close detection switch (S806) of the upper panel input terminal (A/D input) OPEN CLOSE SW “L”: when upper panel close GND SW Control signal output to the ground (GND) changeover switch SET CODE0 Input terminal for the set (open in this set) SET CODE 1 Input terminal for the set (fixed at “L”...
  • Page 29 MZ-G755 Pin No. Pin Name Description SPDL MON Spindle servo monitor signal input from the motor driver (IC551) (XAVLS) Not used (open) 225, 226 (SOUND 1, 2) Not used (open) XHOLD SW HOLD switch input terminal “L”: hold ON, “H”: hold OFF (SYCN REC) SYNCHRO REC switch input terminal “L”: OFF, “H”: ON Not used (open)
  • Page 30 MZ-G755 MEMO...

  • Page 31: Block Diagram - Servo Section

    MZ-G755 6-2. BLOCK DIAGRAM — SERVO SECTION — MAIN BOARD (1/3) SERVO SECTION MOTOR FLEXIBLE MECHANISM (1/2) BOARD (1/2) OVER WRITE HEAD DRIVE HD DRV+ M603 IC601 (1/2) Signal path HD DRV– OVER WRITE HEAD CN502 (1/2) : PLAYBACK UP/DOWN...

  • Page 32: Block Diagram - Audio Section

    MZ-G755 6-3. BLOCK DIAGRAM — AUDIO SECTION — MAIN BOARD (2/3) AUDIO SECTION OPTICAL RECEIVER OPT CONTROL VIF B+ SWITCH Q302 DIN1 J301 LINE IN (OPTICAL) SERVO (LINE IN JACK) SECTION (Page 31) MIC AMP IC303 J303 LIN2 OUT1 LIN1...

  • Page 33: Block Diagram - System Control/Power Section

    MZ-G755 6-4. BLOCK DIAGRAM — SYSTEM CONTROL / POWER SECTION — MAIN BOARD (3/3) SYSTEM CONTROL/POWER SECTION AUDIO RMC KEY SECTION (Page 32) VRMC Q1007 XWK3 RMC KEY CLK SEL CLK SEL FFCLR FFCLR SLEEP SYSTEM SLEEP VLON CONTROL VLON...

  • Page 34: Printed Wiring Board - Main Section

    MZ-G755 6-5. PRINTED WIRING BOARD — MAIN SECTION — Note: • Semiconductor • Y : parts extracted from the conductor side. Location (SIDE A) Replacement of IC801 on main board • : Pattern from the side which enables seeing. requires a special tool.
  • Page 35 MZ-G755 S803 • Semiconductor (PROTECT DETECT) Location (SIDE B) RECHARGEABLE Ref. No. Location (NICKEL CADMIUM) D101 I-11 NC-WMAA 1.2V 1400mAh D201 J-11 D301 H-12 D602 D605 D606 C631 D608 TP602 D901 D902 D903 D1001 MOTOR FLEXIBLE D1005 BOARD L1001 IC301...
  • Page 36 MZ-G755 Common note on Schematic Diagram: • Waveforms • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics 100mV/DIV, 1µs/DIV and tantalums. • All resistors are in Ω and W or less unless otherwise Approx.

  • Page 37: Schematic Diagram - Main Section (1/3)

    MZ-G755 6-6. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — • Refer to page 36 for Common Note on Schematic Diagram and Waveforms, and refer to page 40 for IC Block Diagrams. TP610 TP611 TP603 C508 AP523 AP524 SL505 R507 C501...

  • Page 38: Schematic Diagram - Main Section (2/3)

    MZ-G755 6-7. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) — • Refer to page 36 for Common Note on Schematic Diagram and Waveforms, and refer to page 41 for IC Block Diagrams. R830 C805 IC804 C823 AP840 D803 R812 R804 R805...

  • Page 39: Schematic Diagram - Main Section (3/3)

    MZ-G755 6-8. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — • Refer to page 36 for Common Note on Schematic Diagram and refer to page 40 for IC Block Diagrams. C309 C323 C113 F801 R311 C212 R301 L1003 D1005 L303 C319...

  • Page 40: Ic Block Diagrams

    MZ-G755 6-9. IC BLOCK DIAGRAMS IC501 SN761057ADBT IC551 SC111257FCR2 ADIP-IN 42 41 S-MON A+B+C+D TWpp – PK/BTM VC VG CSLO – PRE DRIVER PRE DRIVER REXT VREF075 Wpp LPF Aw+Dw S-MONITOR TON Peak PGNDW VREF TON Botm Malfa ADIP H-BRIDGE...
  • Page 41 MZ-G755 IC601 XPC18A22AFCR2 VC2 VG OUTPUT SW OUTPUT SW CHARGE CHARGE PUMP 1 PUMP 2 VC VG DC IN HI-BRIDGE CHARGE PRE DRIVER PRE DRIVER MONITOR VREF VREF X2/X4 BATM BUFFER DC IN CVREF CONTROL CONTROL CHARGE CHGSW DW BT...
  • Page 42 MZ-G755 IC301 AK5354VT-E2 CONTROL REGISTER CCLK CDTI LRCK MCLK CLOCK DIVIDER LIN1 BCLK IPGA AUDIO I/F SDTO CONTROLLER RIN1 LIN2 RIN2 VCON VCON AGND IC302 TA2131FL(EL) BEEP V REF VREF LPF1 TCMT IN R BST1 IN L LPF2 OUTB BST2...

  • Page 43: Exploded Views

    MZ-G755 SECTION 7 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • Accessories are given in the last of this parts list. The components identified by mark 0 or dotted line with mark number in the exploded views are not supplied.

  • Page 44: Chassis Section

    MZ-G755 7-2. CHASSIS SECTION MT-MZR700-172 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3379-555-3 CHASSIS ASSY, SET 3-318-382-01 SCREW (1.7X3), TAPPING 3-222-779-11 SPRING (OPEN), TENSION 3-222-837-01 SPRING, BATTERY COIL * 53 A-3323-652-A MAIN BOARD, COMPLETE 3-222-838-01 ARM...

  • Page 45: Md Mechanism Deck Section

    MZ-G755 7-3. MD MECHANISM DECK SECTION (MT-MZR700-172) M603 M602 M601 The components identified by Les composants identifiés par une mark 0 or dotted line with mark marque 0 sont critiques pour la 0 are critical for safety. sécurité. Replace only with part number Ne les remplacer que par une piéce...

  • Page 46: Electrical Parts List

    MZ-G755 SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by mark 0 or dotted line with mark the parts list may be different from the they are seldom required for routine service.
  • Page 47 MZ-G755 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C554 1-104-912-11 TANTAL. CHIP 3.3uF 6.3V C820 1-127-772-81 CERAMIC CHIP 0.033uF C555 1-135-211-11 TANTAL. CHIP 6.8uF 6.3V C821 1-131-862-11 TANTAL. CHIP 47uF C556 1-135-211-11 TANTAL. CHIP 6.8uF...
  • Page 48 MZ-G755 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D603 8-719-081-33 DIODE MA2YD1500LS0 L303 1-414-398-11 INDUCTOR CHIP 10uH D605 8-719-081-33 DIODE MA2YD1500LS0 L501 1-414-398-11 INDUCTOR CHIP 10uH D606 8-719-081-35 DIODE MA2YD1700LS0 L502 1-414-398-11 INDUCTOR CHIP 10uH...
  • Page 49 MZ-G755 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R204 1-218-965-11 RES-CHIP 1/16W R816 1-218-990-11 SHORT R205 1-218-961-11 RES-CHIP 4.7K 1/16W R817 1-218-977-11 RES-CHIP 100K 1/16W R206 1-208-635-11 RES-CHIP 1/16W R821 1-218-981-11 RES-CHIP 220K 1/16W...
  • Page 50 MZ-G755 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1031 1-218-990-11 SHORT ACCESSORIES R1032 1-218-990-11 SHORT ************ R1033 1-208-707-11 METAL CHIP 0.5% 1/16W R1034 1-208-927-11 METAL CHIP 0.5% 1/16W 1-476-304-33 REMOTE CONTROL UNIT (RM-MZ1T) R1035...
  • Page 51 MZ-G755 MEMO...
  • Page 52 MZ-G755 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2002. 04...

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