Sony MDS-JB920 service manual Circuit Boards Location

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• Circuit Boards Location

6-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

AC board

SW board

BAT board

HP board

PSW board

BD board

MAIN board

DISP board

VOL board

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 1/4 W or less unless otherwise specified.

•% : indicates tolerance.

•¢ : internal component.

•C : panel designation.

Note:	Note:
The components identi-	Les composants identifiés par
fied by mark !or dotted	une marque !sont critiques
line with mark !are criti-	pour la sécurité.
cal for safety.	Ne les remplacer que par une
Replace only with part	piéce portant le numéro
number specified.	spécifié.

•U : B+ Line.

•V : B– Line.

•Voltages and waveforms are dc with respect to ground in playback mode.

•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal produc- tion tolerances.

•Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc- tion tolerances.

•Circled numbers refer to waveforms.

•Signal path. E : PB j : REC

p : PB (Digital out)

l : REC (Digital in)

•Abbreviation

CND : Canadian model.

Note on Printed Wiring Boards:

•X : parts extracted from the component side.

•Y : parts extracted from the conductor side.

•¨ : Through hole.

•b : Pattern from the side which enables seeing.

Caution:
Pattern face side:	Parts on the pattern face side seen from
(Side B)	the pattern face are indicated.
Parts face side:	Parts on the parts face side seen from
(Side A)	the parts face are indicated.

• Indication of transistor.

C

These are omitted.

Q

B E

Q

B C E

These are omitted.

• Abbreviation

CND : Canadian model.

– 45 –

– 46 –

Image 42

Contents Specifications MDS-JE520MDM-5A SELF-DIAGNOSIS Function GeneralItems of Error History Mode Items and Contents Table of Contents DiagramsSection Servicing Notes Flexible Circuit Board Repairing VarningVaroitus JIG for Checking BD Board Waveform IOPRecord Precedure Checks Prior to Parts Replacement and Adjustments Forced ResetREC/PLAY Retry Cause Display Mode PrecedureHexadecimal nBinary Conversion Table Section General Location of ControlsFront view Rear view Page Page Section Disassembly CaseFront Panel Seciton Main BoardMechanism Section MDM-5A Slider CAMBase Unit MBU-5A, BD Board SW BOARD, Loading Motor M103Setting the Test Mode Section Test ModePrecautions for USE of Test Mode Exiting the Test ModeSelecting the Test Mode Display Contents Mark GroupOperating the Continuous Playback Mode Non-Volatile Memory Mode EEP ModeMID Auto gain display Not used in servicing Test Mode DisplaysFunctions of Other Buttons Detrack check display Not used in servicingDisplay Contents When Lit When Off Meanings of Other DisplaysSection Electrical Adjustments Parts Replacement and AdjustmentPrecautions for Adjustments Precautions for Checking Laser Diode EmissinonPrecautions for USE of Optical PICK-UP KMS-260A Laser power meterCheck Prior to Repairs Temperature Compensation Offset CheckLaser Power Check Traverse CheckFocus Bias Check Play Checking MO Error Rate CheckCD Error Rate Check Self-Recording/playback CheckLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment CD Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points Section Diagrams BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMPIC PIN Function Description Xrst SrdtSens SqsyMvci XrasXWE AsyoSprd SrdrSfdr SpfdMain Board IC100 CXD8607N A/D Converter TEST2 AvddlVDD1 LvddMain Board IC800 M30610MCA-264FP System Controller MDS-JB920 REC Analog Block Diagram Servo Section∙ Signal Path REC DigitalBlock Diagram Main Section ∙ Signal Path Play Analog OUTPlay Digital OUT Circuit Boards Location Printed Wiring Boards BD Section MDS-JB920 Schematic Diagram BD /2 See 53 for Waveforms. See page 70 and 71 for IC Block DiagramsWaveforms BD board Main board Disp board MDS-JB920 MDS-JB920 MDS-JB920 MDS-JB920 Other layers pattern Side a US, CND Schematic Diagram Panel Section See page 54 for Waveforms IC Block Diagrams BD Board IC101 Schematic Diagram BD Switch SectionPrinted Wiring Board BD Switch Section CXA2523ARIC121 CXD2654R IC152 BH6511FS-E2IC203 Main Board IC100 CXD8607NIC101 CXA8054M CXA8042ASIC200 CXD8767N SN74HC153ANS SN74HCU04ANS-E20Section Exploded Views Chassis SectionFront Panel Section Supplied with RV760206 201 204 205209 4-988-466-21 Spring ELECTROSTATIC, Leaf Base Unit Section MBU-5A Section Electrical Parts List Diode F1J6TP TANTAL. ChipDiode CXA2523ARDisp Main C252 Mylar CXA8042AS HZS6C1LHZ7.5CP-TK SN74HC153ANS390 LED SEL6210S-TH10 Standby Main PSWCoil with Core Vibrator LED SEL6810A-TH10 Mega Control TransistorSW VOL Sony Corporation