Checks Prior to Parts Replacement and Adjustments | Sony MDS-JE770

MDS-JE770

CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”.

•5-6-2. Laser power check (see page 28)

•5-6-3. Iop Compare (see page 28)

•5-6-4. Auto Check (see page 29)

Note:

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.

When performing adjustments, use the specified values for adjustments.

FORCED RESET

The system microprocessor can be reset in the following procedure.

Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.

Procedure :

Remove the short-pin attached to CN406, and then attach it again.

[MAIN BOARD] (Component Side)

@CN406

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Sony MDS-JE770 specifications Checks Prior to Parts Replacement and Adjustments, Forced Reset, Main Board Component Side

Contents

873-890-11 SpecificationsMDS-S50 MDM-7A Supplied accessories Genera l Power requirementsMDS-JE770 SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Disassembly Table of ContentsDiagrams Exploded Views Flexible Circuit Board Repairing MDS-JE770 Section Service Notes IOP JIG for Checking BD Board Waveform Record Precedure Optical PICK-UP Block Type Discrimination KSN-260E Checks Prior to Parts Replacement and Adjustments Forced ResetMain Board Component Side Bit Binary Retry Cause Display Mode Bit When Binary Higher Bits Lower Bits Hexa DetailsHexadecimal Binary Button Descriptions MDS-JE770 Section General Disassembly Flow MDS-JE770 Section Disassembly Front Panel Section Two screws Main Board Over Light Head HR901, BD Board Mechanism Deck Section MDM-7A Loading Motor Assy M103 Holder Assy Optical PICK-UP Sled Motor Assy M102, Slider Spindle Moter Assy M101 Precautions for USE of Test Mode MDS-JE770 Section Test ModeSetting the Test Mode Exiting the Test Mode Selecting the Test Mode MENU/NO Operating the Continuous Playback Mode Mode display Test Mode DisplaysError rate display Functions of Other Buttons Meanings of Other Displays When Memory NG is DisplayedAutomatic SELF-DIAGNOSIS Function Information MDS-JE770 Section Electrical Adjustments Parts Replacement and AdjustmentCheck before replacement Auto Gain Control Output Level Adjustment flow Precautions for USE of Optical PICK- UP KMS-260B/260E Precautions for Checking Laser Diode EmissionPrecautions for Adjustments Temp Adjust Checks Prior to Repairs Using the Continuously Recorded Disc Other Checks Auto CheckTraverse Check Traverse Waveform CD Error Rate Check Play Check MO Error Rate CheckFocus Bias Check Self-Recording/playback Check Initial Setting of Adjustment Value Temperature Compensation Offset AdjutmentLaser Power Adjustment Iop NV Save Traverse 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 Adjustment Adjusting Points and Connecting Points Circuit Boards Location MDS-JE770 Section Diagrams For printed wiring boards For schematic diagramsBD Board Main Board Block Diagrams BD Section IC171IC190 Main Section IC360 2/2IC1 2/2 Semiconductor SemiconductorOVEROptical Pick UP Block Write Head Board Board Main Main Schematic Diagram Main /2 See page 51 for IC Block Diagrams IC1 Model is printed on diagram KB Board Display BoardKEY-SW Board HP Board LED Drive Schematic Diagram Display Section C951 C952 RY910D910 CN921 C924 LF900 C910 Main Schematic Diagram Power Section IC101 CXA2523AR BD Board IC Block Diagrams IC500 AK4524 Main Board IC PIN Function Description IC101 CXA2523AR RF Amplifier BD BoardPin No Pin Name Description Pin No Pin Name Desription Asyo MvciAsyi Avdd Ffdr TfdrFrdr FS4 ADA.RESET IIC PowerFldt Flck EPN ADA. LatchDINT1/H Clip Protect STB TimerBeep SW REC Flcs VDISP1 ResetVFL1 OSC0 Chassis Section Section Exploded Views Not supplied Supplied with J790 FL750 With RV790 FL750 1-517-987-11 Indicator TUBE, Fluorescent Mechanism MDM-7A Motor ASSY, Spindle HEAD, Over LightMotor ASSY, Sled Motor ASSY, Loading MDS-JE770 Section Electrical Parts List Metal Chip SwitchJumper Resistor Short MDS-JE770 Display HP KB KEY-SW KEY-SW Main MDS-JE770 Main 2SD2144S-TP-UVW Resistor VOL-SEL MDS-JE770 Main PT Memo MDS-JE770 Revision History