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MZ-G750/R700
SERVICE MANUAL US Model
Canadian Model
V V er 1.0 2001. 01 er 1.1 2001. 02
AEP Model
UK Model
E Model
Australian Model
Tourist Model
Chinese Model
(Photo: MZ-G750)
Model Name Using Similar Mechanism NEW
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Mechanism Type MT-MZR700-172
Optical Pick-up Name LCX-4R
SPECIFICATIONS
MD recorder Modulation system General
Audio playing system EFM (Eight to Fourteen Modulation) Power requirements
MiniDisc digital a
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MZ-G750/R700 Battery operation time Flexible Circuit Board Repairing 1) Battery life (MZ-G750) • Keep the temperature of the soldering iron around 270°C 2) 3) When recording (Unit: approx.hours) (EIAJ ) during repairing. Batteries Stereo LP2 LP4 • Do not touch the soldering iron on the same conductor of the NC-WMAA Nickel Cadmium 4 6 7.5 circuit board (within 3 times). 4) rechargeable battery • Be careful not to apply force on the conductor when soldering 6) 6) 6) LR6 (SG) Sony alkaline dry 9 13
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MZ-G750/R700 TABLE OF CONTENTS 1. SERVICING NOTE......................................................... 4 5. ELECTRICAL ADJUSTMENTS 5-1. Outline ............................................................................... 18 5-2. Precautions for Adjustment ............................................... 18 2. GENERAL 5-3. Adjustment Sequence ........................................................ 18 Looking at the Controls (MZ-G750)................................... 5 5-4. NV Re
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MZ-G750/R700 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. static break-down because of the potential difference generated Handle the FLEXIBLE board (overwrite he
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MZ-G750/R700 SECTION 2 This section is extracted from GENERAL instruction manual. (MZ-G750) 5
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MZ-G750/R700 (MZ-R700) 6
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MZ-G750/R700 SECTION 3 DISASSEMBLY Note : This set can be disassemble according to the following sequence. Set Panel Assy,Lower Panel Assy, Upper LCD Module Main Board MD Mechanism Deck Service Assy, OP Holder Assy Motor Flexible Board Motor, DC (M602) Motor, DC (M601), Motor, DC (M603) Note : Follow the disassembly procedure in the numerical order given. 3-1. PANEL ASSY, LOWER 3 screws (1.4x2.0), MI 4 claw 2 screws (1.4x2.0), MI 1 5 6 Panel Assy , Lower 3-2. PANEL ASSY, UPPER 2 screws (1.4x2.0)
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MZ-G750/R700 3-3. LCD MODULE 2 screws (1.7x2.5) 1 screws (1.7x2.5) 4 LCD module 3 claws panel assy, upper 3-4. MAIN BOARD 8 CN501 4 screws (M1.7x3) 6 Remove the solders 2 arm 3 screws (M1.4x2) qa Remove the solder 7 qd MAIN board 5 screws (M1.4x2) 9 Remove the solder 1 CN502 qs spring, battery coil q; case assy, battery 8
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MZ-G750/R700 3-5. MD MECHANISM DECK 3 MD mechanism deck boss boss 2 chassis assy, set 1 screws (1.4x1.6), MI 3-6. SERVICE ASSY, OP 3 screw(M1.4), 1 washer (0.8 - 2.5) 5 screw(M1.4), precision pan precision pan 2 gear (SA) 6 spring, thrust detent 4 spring(s), pack 8 Pull off the lead screw. 7 9 Opening the over write head toward the direction A, remove the OP Service assy toward the direction B. B Note: Do not open the entire assy forcibly, when opening the over write head. over writ
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MZ-G750/R700 3-7. HOLDER ASSY 4 Remove the holder assy to direction of the arrow B. 1 Open the holder assy. A 2 B 3 boss 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 with a circular hole in the DC motor (sled), when mounting the motor flexible board. 5 motor flexible board DC m
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MZ-G750/R700 3-9. MOTOR, DC (M602) 3 Remove four solders of motor flexible board. 4 two screws(M1.4), 1 washer (0.8 - 2.5) precision pan 2 gear (SA) 5 moter, DC (sled) (M602) 3-10. “MOTOR, DC (M601)”, “MOTOR, DC (M603)” 1 Remove six solders of motor flexible board. Note: Press-fit the gear (HA) up to the qs moter, DC (over write head up/down) position of the DC motor (over write (M603) head up/down) (M603) as shown below. gear (HA) 6 two screws(M1.4), precision pan 2.65 mm 4 thre
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MZ-G750/R700 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 and MO discs to be automatically adjusted when in the test mode. is selected. In this overall adjustment mode, the disc is discriminate between • Other mode can be selected from the display check mode. CD and MO, and each adjustment is automatically executed in • When the test mode
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MZ-G750/R700 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 x key Manual Mode Press the x key Servo Adjustment + VOL key: 10th Place of item number Audio Adjustment Medium item switching increase. Power Supply Adjustment VOL – key: 10th Place of item n
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MZ-G750/R700 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 control block and the power supply control block in the microcomputer detect it and record its cause as history in the • Address & Adjusted Value Display nonvolatile memory. This set LCD display By checking this history in the test mo
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MZ-G750/R700 • Description of Error Indication Codes Problem Indication code Meaning of code Simple display Description No error 00 No error --- No error Illegal access target 01 Adrs Attempt to access an abnormal address address was specified Servo system error 02 High temperature Temp High temperature 03 Focus error Fcus Disordered focus 04 Spindle error Spdl Abnormal rotation of disc 11 TOC error TOC Faulty TOC contents TOC error 12 Data reading error Data Data could not be read at SYNC Power
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MZ-G750/R700 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. EIB Sound error correction error • Setting method of sound skip check result display Stat Decoder status error mode Play Adrs Address access error 1. Set the test mode (see page 12). 2. Press the N key or [REC] key, and the playing or recording BEmp Buffer is empty sound skip resul
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MZ-G750/R700 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 SET OK 0 00 : AD value of the remote commander Key (hexadecimal OO to FF) Example2: When the keys on the remote commander are con- sidered as OK: This set LCD display RMC OK 0 00 : AD value of the remote commander Key (hexadecimal OO to FF) 5. When all keys were checked or
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MZ-G750/R700 SECTION 5 ELECTRICAL ADJUSTMENTS 5-1. Outline • Setting method of NV reset 1. Select the manual mode of the test mode, and set item number • In this set, automatic adjustment of CD and MO can be per- 021NV Reset (see page 13). formed by entering the test mode (see page 12). However, before starting automatic adjustment, the memory This set LCD display clear, power supply adjustment, and laser power check must be ResNV CC 0 21 performed in the manual mode. • A key having no partic
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MZ-G750/R700 3) Press the X 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 This set LCD display VclPWM 7 62 V1dat 8 62 : Adjusted value : Adjusted value 1. Connect a digital voltmeter to the TP901 (VC) on the MAIN 5) Adjust with the [VOL+] key (adjusted value up) or [VOL--] board, and adjust [VOL +] key (voltage up) or [VOL --] key key (adjusted va
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MZ-G750/R700 1. Connect a digital voltmeter to the TP902 (VL) on the MAIN 2. Press the . key continuously until the optical pick-up board, and adjust [VOL +] key (voltage up) or [VOL --] key moves to the most inward track. (voltage down) so that the voltage becomes 2.30 ± 0.01 V. 3. Open the cover and set the laser power meter on the objective lens of the optical pick-up. digital 4. Press the N key, and set the laser MO read adjustment mode voltmeter (item number 011). MAIN board This set LCD di
