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Sony MZ-B50 Service Manual

Portable minidisc recorder
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SERVICE MANUAL
Ver 1.1 2001.03
With SUPPLEMENT-1
(9-927-952-83)
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
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
Maximum 80 minutes (MDW-80, stereo
recording)
Maximum 160 minutes (MDW-80, monaural
recording)
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74, monaural
recording)
Revolutions
400 rpm to 1,800 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Sony Corporation
9-927-952-12
2001C0200-1
Audio Entertainment Group
© 2001.3
General Engineering Dept.
MZ-B50
Model Name Using Similar Mechanism
Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Coding
Adaptive TRansform Acoustic Coding
(ATRAC)
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
Speaker
28 mm (1
1/8
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.35– 1.38 mV
Line in: stereo mini-jack, 69– 194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
i : stereo mini-jack
Headphones/earphones: 5 mW + 5 mW
Speaker: 300 mW
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
AEP Model
Tourist Model
NEW
MT-MZB50-165
LCX-2R
in.) dia.
– Continued on next page –

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  • Page 1 MZ-B50 SERVICE MANUAL US Model Canadian Model Ver 1.1 2001.03 AEP Model With SUPPLEMENT-1 Tourist Model (9-927-952-83) US and foreign patents licensed from Dolby Model Name Using Similar Mechanism Laboratories Licensing Corporation Mechanism Type MT-MZB50-165 Optical Pick-up Name LCX-2R SPECIFICATIONS...

  • Page 2: Table Of Contents

    6-7. Printed Wiring Boards – Battery Section – Headphones/earphones with a remote control (1) 6-8. Schematic Diagram – Main Section (1/4) – Sony LR6 (size AA) dry batteries (2) 6-9. Schematic Diagram – Main Section (2/4) – Carrying pouch (1) 6-10.

  • Page 3: Servicing Notes

    SECTION 1 SERVICING NOTES • When repairing this device with the power on, if you remove the NOTES ON HANDLING THE OPTICAL PICK-UP MAIN board or open the upper panel assy, this device stops work- BLOCK OR BASE UNIT ing. The laser diode in the optical pick-up block may suffer electrostatic In this case, you can work without the device stopping by fasten- break-down because of the potential difference generated by the...

  • Page 4: General

    SECTION 2 This section is extracted from instruction manual. GENERAL LOCATION AND FUNCTION OF CONTROLS – Front of the recorder – 1 EASY SEARCH +/– buttons 2 VOR indicator 3 PLAY MODE button 4 DISPLAY button 5 .REVIEW/AMS/>CUE/AMS (search /AMS) button 6 FAST PB button 7 x STOP button 8 i (headphones/earphones) jack...
  • Page 5 – The display window – 1 V-UP indication 2 Fast Playback indication 3 Disc indication Shows that the disc is rotating for recording, playing or editing an MD. 4 STEREO (stereo)/MONO (monaural) indication 5 Play mode indication 6 REC indication Lights up while recording.

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY The equipment can be removed using the following procedure. BATT board, DC jack board Panel (lower) ASSY Main board, Sled control board Mechanism deck Optical pick-up Panel (upper lid) ASSY Key board unit Note : Follow the disassembly procedure in the numerical order given. 3-1.

  • Page 7: Panel (Upper Lid) Assy

    3-3. PANEL (UPPER LID) ASSY Panel (upper lid) ASSY Spring (UP), tension 1 Screw (step M1.4) 1 Screw (step M1.4) 3 Claw 3 Claw 3-4. KEY BOARD UNIT Panel (upper lid) sub ASSY 2 Screws (B1.7x4) 2 Screws (B1.7x4) 6 Screws (1.7x3) 1 Screw, ornament...

  • Page 8: Batt Board, Dc Jack Board

    3-5. BATT BOARD, DC JACK BOARD 1 Screws (1.7x3) 1 Screws (1.7x3) BATT board 4 Screws (1.7x3) DC jack board 2 Insert a precision screwdriver and move a point of battery terminal (+) away from a claw. Cabinet (belt) 3-6. MECHANISM DECK 5 Head flexible board (CN2001) Mechanism deck...

  • Page 9: Optical Pick-Up

    3-7. OPTICAL PICK-UP 1 Washer (0.8 - 2.5) 2 Gear (SA) 3 Precision pan screw (M1.4) 7 Pull off the lead screw. 5 Screw 4 Rack spring 5 Screw 8 Bearing 9 Peel off the head flexible board 0 Opening the over write head Mechanism deck toward the direction A , remove the (MT-MZB50-165)

  • Page 10: Test Mode

    SECTION 4 TEST MODE [Outline] 2 In the normal mode, turn on the HOLD switch on the set. While pressing the key on the set, press the following set keys • This set provides the Overall adjustment mode (Assy mode) that in the following order: allows CD and MO disc to be automatically adjusted when in the test mode.
  • Page 11 [Configuration of Test Mode] [EASY SEARCH +] key: 100th place of mode number [Test Mode $Display Check Mode%] [Major item switching] increase. [EASY SEARCH +] Press the > [EASY SEARCH --] key: 100th place of [Manual Mode] mode number Press the decrease.
  • Page 12 5. Set the mode No. to 011. The display changes a shown below [Overall Adjustment Mode] [DISPLAY] each time the key is pressed. Mode to adjust the servo automatically in all items. Normally, automatic adjustment is executed in this mode at the repair.
  • Page 13 [REC] [Sound Skip Check Result Display Mode] 4. When key on the set is pressed, the total of error count is displayed on the LCD, and each time the > key is This set can display and check the error count occurring during pressed, the error count descents one by one as shown below.
  • Page 14 [Self-Diagnosis Display Mode] • This set uses the self-diagnosis system in which if an error oc- curs in recording/playback mode, the error is detected by the model control and power control blocks of the microprocessor and information on the cause is stored as history in EEPROM. By viewing this history in test mode, it helps you to analyze a fault and determine its location.
  • Page 15 • Description of Indication History History code number Description 1st0 The first error 1st1 Total recording time when 1st0 was generated (Higher rank byte) 1st2 Total recording time when 1st0 was generated (Lower rank byte) The last error Total recording time when N 0 was generated (Higher rank byte) Total recording time when N 0 was generated (Lower rank byte) N-10 One error before the last.
  • Page 16 [Key Check Mode] This set can check if the set and remote commander function nor- mally. • Setting Method of Key Check Mode 1. Setting the test mode. (See page 10) [T MARK] 2. Press the activates the key check mode where all segments of LCD turn OFF.

  • Page 17: Electrical Adjustments

    Available SONY CD disc R e s * * * • Recorded MO disc PTDM-1 (Part No. : J-2501-054-A) Available SONY MO disc (recorded) r NV reset (after several seconds) • Laser power meter LPM-8001 (Part No. : J-2501-046-A) R e s e t ! •...
  • Page 18 • Adjustment method of VC PWM Duty (L) digital (mode number: 762) voltmeter 1. Select the manual mode of the test mode, and set the mode number 762. (See page 11) TP914 (VR) LCD display V c l P W M TP5105 MAIN BOARD (SIDE B) (GND)
  • Page 19 • Adjustment method of VC PWM Duty (H) digital (mode number: 765) voltmeter 1. Select the manual mode of the test mode, and set the mode number 765. (See page 11) TP914 (VR) LCD display TP5105 V c h P W M MAIN BOARD (SIDE B) (GND) C610...
  • Page 20 : Left side = MO auto adjustment information for the items not accepted. (See page 11) F * : Auto adjustment finished 8. If CD adjustment is OK, insert an available SONY MO disc 1 * : Manual adjustment remains (recorded).
  • Page 21 • MO Automatic Adjustment item [Laser Power Check] Connection : Mode No. Description laser power meter MO electrical offset adjustment Optical pick-up Lower reflection CD tracking error gain adjustment objective lens Lower reflection CD tracking error offset adjustment Lower reflection CD ABCD level adjustment digital Lower reflection CD focus gain adjustment voltmeter...

  • Page 22: Diagrams

    SECTION 6 DIAGRAMS 6-1. EXPLANATION OF IC TERMINALS • MAIN BOARD IC501 SN761056CDBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin name Description Tracking error signal output to the CXD2660GA (IC502) REXT — Connected to the external resistor for the ADIP amplifier control WPPLPF —...
  • Page 23 • MAIN BOARD IC502 CXD2660GA (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO SIGNAL PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER, 16M BIT D-RAM) Pin No. Pin name Description VDC0 — Power supply terminal (+1.8V) (for internal logic) MNT0 Not used (open) MNT1 Recording shock detect signal output to the system controller (IC801) MNT2...
  • Page 24 Pin No. Pin name Description FS256 Clock signal (11.2896 MHz) output to the A/D, D/A converter (IC301) (X’ tal system) A03, A04, A02, Address signal output to the external D-RAM Not used (open) 47 to 52 A05, A01, A06 VDIO1 —...
  • Page 25 Pin No. Pin name Description XLRF Serial latch signal output terminal Not used (open) CKRF Serial clock signal output terminal Not used (open) DTRF Writing data output terminal Not used (open) Control signal output to the reference voltage generator circuit for the laser automatic APCREF power control LDDR...
  • Page 26 • MAIN BOARD IC801 CXR701080-020GA (MASTER CONTROLLER) Pin No. Pin name Description SYNC REC SYNCHRO REC switch (S801) input terminal “L”: off, “H”: on OFTRK Off track signal input from the CXD2660GA (IC502) Rec-proof claw detect input from the protect detect switch (S806) PROTECT “L”: recording possible , “H”: protect PAUSE KEY...
  • Page 27 Pin No. Pin name Description PD S0 PD IC mode switching signal output to the optical pick-up block MIC AMP +2.5V REG on/off control signal output terminal PD S1 PD IC mode switching signal output to the optical pick-up block FFCLR Input latch output for starting signal to the MPC18A31FTAEB (IC901) SLEEP...
  • Page 28 Pin No. Pin name Description Sub system clock output terminal Not used (open) — Ground terminal VBKAN Sub power supply input terminal S MON Servo signal monitor input from the SN761056ADBT (IC501) (A/D input) VB MON Un-regulator power supply voltage monitor input terminal (A/D input) SET KEY3 VOR key (S811), ERASE key (S813) input VREF MON...

  • Page 29: Block Diagram - Main Section (1/3)

    MZ-B50 6-2. BLOCK DIAGRAM – MAIN Section (1/3) – BATT BOARD (1/2) MAIN BOARD (1/3) ANALOG REC ADDT OVER WRITE HR601 HEAD DRIVE EFMO LOGIC OVER WRITE HEAD Q601, 602 DIGITAL REC DIN1 OPTICAL PICK-UP BLOCK (LCX-2R) RF AMP, FOCUS/TRACKING ERROR AMP...

  • Page 30: Block Diagram - Main Section (2/3)

    MZ-B50 6-3. BLOCK DIAGRAM – MAIN Section (2/3) – MAIN BOARD (2/3) OPTICAL RECEIVER B+ SWITCH VC B+ Q302 DIGITAL REC J301 LINE IN +2.5V REGULATOR VC B+ (OPTICAL) IC305 +2.5V A/D, D/A CONVERTER (LINE IN JACK) B+ SWITCH REGULATOR...

  • Page 31: Block Diagram - Main Section (3/3)

    MZ-B50 6-4. BLOCK DIAGRAM – MAIN Section (3/3) – MAIN BOARD (3/3) POWER CONTROL IC901 OVER WRITE HEAD VC B+ DRIVE CIRCUIT B+ RF AMP (IC501), DSP (IC502), D905 MOTOR/COIL DRIVE (IC601), L904 RMC KEY VCIN SWITCHING OVER WRITE HEAD DRIVE (IC603),...

  • Page 32: Printed Wiring Boards - Main Section (1/2)

    MZ-B50 6-5. PRINTED WIRING BOARDS – MAIN Section (1/2) – Refer to page 49 for Notes. J303 Semiconductor Location (PLUG IN POWR) Ref. No. Location Ref. No. Location D301 C-10 Q104 MAIN BOARD (SIDE A) D302 B-10 Q105 D303 R318...

  • Page 33: Printed Wiring Boards - Main Section (2/2)

    MZ-B50 6-6. PRINTED WIRING BOARDS – MAIN Section (2/2) – Refer to page 49 for Notes. Semiconductor S814 Location MEGA BASS Ref. No. Location MAIN BOARD (SIDE B) D101 D201 C934 D307 C372 LF901 D600 C636 Q902 R910 C957 D601...

  • Page 34: Printed Wiring Boards - Battery Section

    MZ-B50 6-7. PRINTED WIRING BOARDS – BATTERY Section – Refer to page 49 for Notes. DRY BATTERY HR601 SIZE "AA" OVERWRITE (IEC DESIGNATION LR6) HEAD 2PCS, 3V BATT BOARD (SIDE A) DC JACK BOARD DC JACK BOARD (SIDE A) CN2001...

  • Page 35: Schematic Diagram - Main Section

    MZ-B50 6-8. SCHEMATIC DIAGRAM – MAIN Section (1/4) – Refer to page 49 for Notes. Refer to page 50 - 51 for Waveforms. Refer to page 52 - 54 for IC Block Diagrams. – 41 – – 42 –...

  • Page 36: Schematic Diagram - Main Section

    MZ-B50 6-9. SCHEMATIC DIAGRAM – MAIN Section (2/4) – Refer to page 49 for Notes. Refer to page 50 - 51 for Waveforms. Refer to page 52 - 54 for IC Block Diagrams. – 43 – – 44 –...

  • Page 37: Schematic Diagram - Main Section

    MZ-B50 6-10. SCHEMATIC DIAGRAM – MAIN Section (3/4) – Refer to page 49 for Notes. Refer to page 50 - 51 for Waveforms. – 45 – – 46 –...

  • Page 38: Schematic Diagram - Main Section

    MZ-B50 6-11. SCHEMATIC DIAGRAM – MAIN Section (4/4) – Refer to page 49 for Notes. Refer to page 50 - 51 for Waveforms. Refer to page 52 - 54 for IC Block Diagrams. – 47 – – 48 –...
  • Page 39 Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. • All resistors are in Ω and W or less unless otherwise specified. •...
  • Page 40 • Waveforms IC301 1 (MCLK), IC502 rh (FS256) IC501 ed (RF), IC502 uk (RFI) (PLAY Mode) IC502 <zxv (SPVS), IC504 1, 2 400 mV/DIV, 1 µs/DIV 1 V/DIV, 20 ns/DIV IC601 3 (PWMI), IC801 yj (SPDL PWM) (REC Mode) 1 V/DIV, 5 µs/DIV Approx.
  • Page 41 IC601 ej, ek, el, r; (COM, Q607 (Drain) IC801 yh (VC PWM) 50 mV/DIV, 5 µs/DIV 40 mV/DIV, 5 µs/DIV CPWI, CPVI, CPUI) 400 mV/DIV, 5 µs/DIV 114 mVp-p 203 mVp-p 1.3 Vp-p 11.3 µ s 8.6 ns 11.5 µ s Q904 (Drain) IC803 5 (LX) IC603 qk (COSC) (REC Mode)
  • Page 42 • IC BLOCK DIAGRAMS (MAIN SECTION) IC301 AK4517BVQ-L CLOCK PGAL MCLK DIVIDER 47 ADCL LRCK VCML BCLK SDTO AUDIO CONVERTER VCMR INTERFACE CONTROLLER SDTI 43 ADCR DIF0 42 PGAR DIF1 41 NC 40 NC 39 NC 38 VRAD TST3 37 LOUT2 36 ROUT2 35 VRDA 34 OPGAL...
  • Page 43 IC601 XC111256FTAEB CPUO – 3PHASE CPVO CONTROL DRIVER – CPWO – H-BRIDGE H-BRIDGE PGND1 PGND3 DRIVER CONTROL CONTROL DRIVER VM12 VM34 BIAS H-BRIDGE H-BRIDGE PGND2 DRIVER CONTROL CONTROL DRIVER PGND4 PWM24 15 16 17 IC602 MPC17A17XDTBR2 OUTA OUTC CHARGE PUMP OUTB LEVEL SHIFTER...
  • Page 44 IC603 MPC18A20MTAEL CONTROL CHARGE PUMP LOGIC PRE DRIVER COMP COMP VREF DRIVER LOGIC BIAS VREF – 54 –...

  • Page 45: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE : • The mechanical parts with no reference • -XX, -X mean standardized parts, so they number in the exploded views are not The components identified by mark 0 may have some difference from the original supplied.

  • Page 46: Panel Upper Lid Section

    7-2. PANEL UPPER LID SECTION MIC1 MIC2 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 51 3-049-881-01 HOLDER (UPPER LID) 3-318-382-61 SCREW (1.7X2.5), TAPPING 3-318-382-31 SCREW (1.7X3), TAPPING A-3052-234-A CABINET (MIC-R) SUB ASSY * 53 3-049-879-01 BRACKET (REC LOCK) 3-049-893-01 CUSHION (MICROPHONE R) 3-049-921-01 SPRING (REC), TENSION...

  • Page 47: Cabinet (Belt) Section

    7-3. CABINET (BELT) SECTION supplied supplied 102 102 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3021-349-A MAIN BOARD, COMPLETE 3-049-916-02 PACKING 3-318-382-31 SCREW (1.7X3), TAPPING X-3379-359-1 TERMINAL (+ –) ASSY, BATTERY 3-318-382-61 SCREW (1.7X2.5), TAPPING 4-973-282-01 TERMINAL BOARD, BATTERY * 104 3-049-912-01 COVER (FLEXIBLE)

  • Page 48: Mechanism Deck Setion (Mt-Mzb50-165)

    7-4. MECHANISM DECK SECTION (MT-MZB50-165) supplied not supplied M602 M601 The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No.

  • Page 49: Electrical Parts List

    SECTION 8 BATT JACK MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 50 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C235 1-164-937-11 CERAMIC CHIP 0.001uF C356 1-125-777-11 CERAMIC CHIP 0.1uF C236 1-125-777-11 CERAMIC CHIP 0.1uF C357 1-164-949-11 CERAMIC CHIP 0.047uF C358 1-164-949-11 CERAMIC CHIP 0.047uF C237 1-162-970-11 CERAMIC CHIP 0.01uF C361 1-125-837-91 CERAMIC CHIP...
  • Page 51 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C608 1-107-819-11 CERAMIC CHIP 0.022uF C929 1-119-923-81 CERAMIC CHIP 0.047uF C609 1-119-923-81 CERAMIC CHIP 0.047uF C930 1-164-937-11 CERAMIC CHIP 0.001uF C931 1-164-937-11 CERAMIC CHIP 0.001uF C610 1-164-935-11 CERAMIC CHIP 470PF C932 1-125-837-91 CERAMIC CHIP...
  • Page 52 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < IC > < LINE FILTER > IC301 8-759-641-92 IC AK4517BVQ-L LF901 1-416-405-21 FILTER, CHIP EMI (COMMON MODE) IC302 8-759-572-38 IC NJM2140R IC303 8-759-687-37 IC OPA2340EA/2K5-S < TRANSISTOR > IC304 8-759-559-91 IC RN5RZ25AA-TR IC305...
  • Page 53 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q605 8-729-928-27 TRANSISTOR DTA144EE-TL R151 1-218-941-11 RES-CHIP 1/16W Q607 8-729-046-45 TRANSISTOR SI2302DS-T1 R152 1-208-699-11 METAL CHIP 4.7K 0.5% 1/16W R153 1-208-935-11 METAL CHIP 100K 0.5% 1/16W Q809 8-729-230-60 TRANSISTOR 2SA1586YG-TE85L R201...
  • Page 54 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R312 1-218-963-11 RES-CHIP 6.8K 1/16W R518 1-218-977-11 RES-CHIP 100K 1/16W R313 1-218-971-11 RES-CHIP 1/16W R519 1-218-953-11 RES-CHIP 1/16W R520 1-218-973-11 RES-CHIP 1/16W R314 1-208-687-11 METAL CHIP 1.5K 0.5% 1/16W R522...
  • Page 55 MAIN SLED CONTROL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R845 1-208-927-11 METAL CHIP 0.5% 1/16W < SWITCH > R846 1-218-941-11 RES-CHIP 1/16W S301 1-572-922-11 SWITCH, SLIDE (MIC SENSE) R848 1-218-977-11 RES-CHIP 100K 1/16W S802 1-771-475-21 SWITCH, SLIDE (HALF LOCK) R849 1-218-985-11 RES-CHIP...
  • Page 56 MZ-B50 Ref. No. Part No. Description Remark MISCELLANEOUS *************** 1-678-999-11 PLUNGER FLEXIBLE BOARD (SPINDLE) (INCLUDING GEAR) 1-476-172-11 KEY BOARD UNIT 1-476-354-11 SWITCH UNIT (INCLUDING S801, S806) 1-476-359-11 CONNECTOR UNIT 1-678-846-11 MOTOR FLEXIBLE BOARD A-3052-224-A CHASSIS BLOCK ASSY, GEAR (INCLUDING M603)
  • Page 57 MZ-B50 US Model Canadian Model SERVICE MANUAL AEP Model Tourist Model 2001. 03 SUPPLEMENT-1 File this Supplement with the Service Manual. Subject : CANADIAN MODEL HAS BEEN ADDED CHANGE OF BOARDS MODEL ADDETION The Canadian model is approximately the same as the US model .
  • Page 58 MZ-B50 • CHANGED PARTS LIST • Abbreviation CND : Canadian EXPLODED VIEWS (Service Manual See page 55 to 57) JEW : Tourist Before Change After Change Ref.No. Part No. Description Part No. Description A-3052-244-A PANEL (LOWER) ASSY A-3052-244-A PANEL (LOWER) ASSY (AEP,JEW) –––––––––...
  • Page 59 MZ-B50 • CHANGE OF BOARDS Printinted wiring boards have been changed. Printed wiring board and schematic diagram of new type, and changed parts list are described in this Supplement-1. Refer to original service nanual (9-927-952-11) previously issued for other information.
  • Page 60 MZ-B50 After Change (-13,-21) Before Change (-12) Part No. Description Ref.No. Part No. Description FB801 ––––––––– 1-216-864-91 SHORT IC303 8-759-687-37 IC OPA2340EA/2K5-S 8-759-641-90 IC OPA2340EA/2K5 IC606 ––––––––– 8-759-647-75 IC TC7W66FK(TE85R) @IC801 8-752-921-16 IC CXR701080-020GA 8-752-922-26 IC CXR701080-021GA Q608 ––––––––– 8-729-928-27 TRANSISTOR DTA144EE Q609 –––––––––...
  • Page 61 MZ-B50 PRINTED WIRING BOARDS – MAIN Section (1/2) – (Last digit –13: AEP,JEW MODEL) MAIN BOARD (SIDE A) Semiconductor Location R318 Ref. No. Location Ref. No. Location Q201 Q305 C908 Q906 C326 R229 R245 R223 C207 C907 C315 R941 R940...
  • Page 62 MZ-B50 PRINTED WIRING BOARDS – MAIN Section (2/2) – (Last digit –13: AEP,JEW MODEL) S814 MEGA BASS MAIN BOARD (SIDE B) Semiconductor Location C934 Ref. No. Location C372 LF901 Q902 C636 R910 C957 D101 R335 C206 C106 D201 L607 R334...
  • Page 63 MZ-B50 PRINTED WIRING BOARDS – BATTERY Section – (JEW MODEL) DRY BATTERY HR601 SIZE "AA" OVERWRITE (IEC DESIGNATION LR6) HEAD 2PCS, 3V BATT BOARD (SIDE A) DC JACK BOARD DC JACK BOARD (SIDE A) CN2001 (SIDE B) J1001 DC IN 3V...
  • Page 64 MZ-B50 PRINTED WIRING BOARDS – BATTERY Section – (AEP MODEL) DRY BATTERY HR601 SIZE "AA" OVERWRITE (IEC DESIGNATION LR6) HEAD 2PCS, 3V BATT BOARD (SIDE A) DC JACK BOARD DC JACK BOARD (SIDE A) CN2001 (SIDE B) D1001 J1001 DC IN 3V...
  • Page 65 MZ-B50 PRINTED WIRING BOARDS – MAIN Section(1/2) – (Last digit –21:US, CANADIAN MODEL) MAIN BOARD (SIDE A) Semiconductor Location R318 Q201 Ref. No. Location Ref. No. Location Q305 C908 C318 C326 R229 R223 C207 C907 Q906 R941 R940 C315 FB309...
  • Page 66 MZ-B50 PRINTED WIRING BOARDS – MAIN Section (2/2) – (Last digit –21:US,CANADIAN MODEL) S814 MEGA BASS MAIN BOARD (SIDE B) Semiconductor Location C934 C372 LF901 Ref. No. Location Q902 C636 R910 C957 C958 R335 D101 C206 C106 L607 R334 C959...
  • Page 67 MZ-B50 PRINTED WIRING BOARDS – BATTERY Section – (US,CANADIAN MODEL) DRY BATTERY HR601 SIZE "AA" OVERWRITE (IEC DESIGNATION LR6) HEAD 2PCS, 3V BATT BOARD (SIDE A) DC JACK BOARD DC JACK BOARD (SIDE A) CN2001 (SIDE B) D1001 J1001 DC IN 3V...
  • Page 68 MZ-B50 SCHEMATIC DIAGRAM – MAIN Section (1/4) – (Last digit –13, –21)
  • Page 69 MZ-B50 SCHEMATIC DIAGRAM – MAIN Section (2/4) – (Last digit –13, –21)
  • Page 70 MZ-B50 SCHEMATIC DIAGRAM – MAIN Section (3/4) – (Last digit –13, –21)
  • Page 71 MZ-B50 SCHEMATIC DIAGRAM – MAIN Section (4/4) – (Last digit –13, –21)
  • Page 72 MZ-B50 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2001.03...

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