Sony Singapore model, Hong Kong model Table of Contents, Disassembly, Diagrams, Exploded Views

Page 5

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow- ing safety checks before releasing the set to the customer:

Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE

The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leak- age current can be measured by any one of three methods.

1.A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2.A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3.Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a pas- sive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal

Parts on Set

AC

0.15∝F 1.5kΩ voltmeter

(0.75V)

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

MODEL IDENTIFICATION

— BACK PANEL —

Parts No.

4-216-349-0πUS model

4-216-349-1πCanadian model 4-216-349-2πAEP, UK model

4-216-349-3πAustralian model 4-216-349-4πSingapore model

4-216-349-5πHong Kong model

TABLE OF CONTENTS

 

1. SERVICING NOTE

6

2. GENERAL

11

3. DISASSEMBLY

 

3-1. Case and Front Panel

12

3-2. Slider (Cam)

12

3-3. Base Unit (MBU-5A) and BD Board

13

3-4. SW Board and Loading Motor (M103)

13

4. TEST MODE

14

5. ELECTRICAL ADJUSTMENTS

19

6. DIAGRAMS

 

6-1. Circuit Boards Location

28

6-2. Block Diagrams

 

• BD Section

29

• Main Section

31

6-3. Printed Wiring Board – BD Section –

35

6-4. Schematic Diagram – BD Section – (1/2)

37

Schematic Diagram – BD Section – (2/2)

39

6-5. Schematic Diagram – Main Section – (1/2)

41

Schematic Diagram – Main Section – (2/2)

43

6-6. Printed Wiring Board – Main Section –

45

6-7. Printed Wiring Board – Panel Section –

47

6-8. Schematic Diagram – Panel Section –

49

6-9. Schematic Diagram – BD Switch Section –

51

6-10. Printed Wiring Board – BD Switch Section –

51

6-11. IC Block Diagrams

52

6-12. IC Pin Functions

55

7. EXPLODED VIEWS

 

7-1. Case and Back Panel Section

61

7-2. Front Panel Section

62

7-3. Mechanism Section (MDM-5A)

63

7-4. Base Unit Section (MBU-5A)

64

8. ELECTRICAL PARTS LIST

65

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Contents MDS-JE330 Specifications SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Varnig Flexible Circuit Board RepairingDisassembly Table of ContentsDiagrams Exploded ViewsJIG for Checking BD Board Waveform Section Servicing NoteIOP TEORecord Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsCriteria for Determination Measure if unsatisfactory REC/PLAYBit Binary Retry Cause Display ModeHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Front Panel Section GeneralLocation of Parts and Controls Slider CAM Section DisassemblyCase and Front Panel SW Board and Loading Motor M103 Base Unit MBU-5A and BD BoardPrecautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeGroup Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID OUTFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays Parts Replacement and Adjustment Section Electrical AdjustmentsPrecautions for USE of Optical PICK- UP KMS-260A Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Creating Continuously Recorded DiscLaser Power Check Temperature Compensation Offset CheckChecks Prior to Repairs Specified ValueCD Error Rate Check Play Checking MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment Auto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points Circuit Boards Location Section DiagramsMDS-JE330 Block Diagrams BD SectionLD-LOVO Main SectionFor printed wiring boards For schematic diagramsWaveforms Display SectionSemiconductor Location Printed Wiring Board BD SectionSchematic Diagram BD 1/2 Section Schematic Diagram BD 2/2 Section Schematic Diagram Main 1/2 Section Schematic Diagram Main 2/2 Section Printed Wiring Board Main Section Printed Wiring Board Panel Section Schematic Diagram Panel Section BD Section IC101 Schematic Diagram BD Switch Section IC Block DiagramsPrinted Wiring Board BD Switch Section IC152 BH6511FS-E2 IC121 CXD2654RIC406 M62016L Main section IC301 UDA1341TS/N2IC381 M5218AL IC441 LB1641 Pin No Pin Name Function IC PIN FunctionsIC101 RF Amplifier CXA2523AR BD board MNT1 Shck MNT0 FOKMNT2 Xbusy MNT3 SlocAsyo MvciAsyi AvddFfdr TfdrFrdr FS4IC501 System Control M30620MC-400FP Main board PB-P OPT DEL OPT SEL Mode SELREC/PB SDACase and Back Panel Section Section Exploded Views6162 Front Panel Section225 226 206 205 Mechanism Section MDM-5A251 252 Base Unit Section MBU-5AResistors Section Electrical Parts ListDisplay Display KEY SW Main PIN, Connector 7P Inductor Vibrator MDS-JE330 Main SW VOL SEL
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