Sony MDS-JE640 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

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5-14. ERROR RATE CHECK

5-14-1. CD Error Rate Check

Checking Procedure :

1.Load a check disc (MD) TDYS-1.

2.Rotate the AMS knob and display “CPLAY1 MODE”.

3.Press the YES button twice and display “CPLAY1 MID”.

4.The display changes to “C1 = AD = ”.

5.Check that the C1 error rate is below 20.

6.Press the MENU/NO button, stop playback, press the A but- ton, and remove the test disc.

5-14-2. MO Error Rate Check

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the AMS knob and display “CPLAY1 MODE”.

3.Press the YES button and display “CPLAY1 MID”.

4.The display changes to “C1 = AD = ”.

5.If the C1 error rate is below 20, check that ADER is 00.

6.Press the MENU/NO button, stop playback, press the A but- ton, and remove the test disc.

5-15. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the AMS knob and display “CPLAY1 MODE”.

3.Press the YES button twice and display “CPLAY1 MID”.

4. Press the

MENU/NO

button when “C1 =

AD = ” is

displayed.

 

5.Rotate the AMS knob and display “FBIAS CHECK”.

6.Press the YES button and display “ / c = ”.

The first four digits indicate the C1 error rate, the two digits after [/] indicate ADR, and the 2 digits after [c =] indicate the focus bias value.

Check that the C1 error is below 20 and ADER is below 2.

7.Press the YES button and display “ / b = ”. Check that the C1 error is below 100 and ADER is below 2.

8.Press the YES button and display “ / a = ”. Check that the C1 error is below 100 and ADER is below 2

9.Press the MENU/NO button, next press the A button, and remove the continuously recorded disc.

Note 1 : If the C1 error and ADER are above other than the speci- fied value at points a (step 8. in the above) or b (step 7. in the above), the focus bias adjustment may not have been carried out properly. Adjust perform the beginning again.

5-16. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the Optical pick-up is re- placed.

If the adjustment results becomes “Adjust NG!”, the Optical pick- up may be faulty or the servo system circuits may be abnormal.

5-16-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the check disc (MD) TDYS-1.

2.Rotate the AMS knob to display “AG Set (CD)”.

3.When the YES button is pressed, the adjustment will be performed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (CD)”.

4.Press the A button to remove the disc.

5-16-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the reference disc (MDW-74/GA-1) for recording.

2.Rotate the AMS knob to display “AG Set (MO)”.

3.When the YES button is pressed, the adjustment will be performed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (MO)”.

4.Press the A button to remove the disc.

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Contents Inputs SpecificationsOutputs NEWSELF-DIAGNOSIS Function Supplied accessoriesGeneral Three- or five Digit code Cause/Remedy MessageItems of Error History Mode Items and Contents Disassembly Table of ContentsDiagrams Exploded ViewsFlexible Circuit Board Repairing Section Service NotesIOP JIG for Checking BD Board WaveformRecord Precedure Main Board Component Side Checks Prior to Parts Replacement and AdjustmentsForced Reset Bit Binary Retry Cause Display ModeHexadecimal t Binary Conversion Table Section General Front Panel Section Section DisassemblyPT BOARD, VOL-SEL Board Main BoardBD Board Mechanism Deck Section MDM-7APrecautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeDisplay Details Mark Group Selecting the Test ModeMENU/NO Operating the Continuous Playback ModeMode display Test Mode DisplaysError rate display Functions of Other ButtonsMeanings of Other Displays When Memory NG is DisplayedAutomatic SELF-DIAGNOSIS Function InformationCheck before replacement Section Electrical AdjustmentsParts Replacement and Adjustment YES Adjustment flowPrecautions for Adjustments Precautions for Checking Laser Diode EmissionPrecautions for USE of Optical PICK- UP KMS-260B Checks Prior to Repairs Using the Continuously Recorded DiscOther Checks Auto CheckCD Error Rate Check Play Check MO Error Rate CheckLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Iop NV Save Traverse AdjustmentYES Focus Bias AdjustmentAuto 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 For schematic diagrams Section DiagramsFor printed wiring boards Circuit Boards LocationMDS-JE640 Block Diagrams BD SectionSignal Path REC Analog Main SectionDisplay Board BD BoardMain Board Semiconductor Printed Wiring Board BD SectionPIN PIN Function Printed Wiring Board Main Section Side a IC2 Printed Wiring Board Main Section Side BIC1 PIN MDS-JE640 Schematic Diagram Main /3 See page 47 for IC Block Diagrams Printed Wiring Board Power Section Printed Wiring Board Display Section Schematic Diagram Display Section See page 34 for Waveforms IC101 CXA2523AR BD Board IC Block DiagramsIC400 LA5643 Main Board IC101 CXA2523AR RF Amplifier BD Board IC PIN FunctionsMNT0 FOK Mvci Tfdr IC1 M30805SGP System Control Main Board HLDA/ALE Chassis Section Section Exploded ViewsPanel ASSY, Front Silver Panel ASSY, Front Black AEP,UK,CIS,SP,MY202 220 201 213 215 216 205 218 207 Mechanism MDM-7AMotor ASSY, Spindle HEAD, Over LightMotor ASSY, Sled Motor ASSY, LoadingSection Electrical Parts List Metal Chip IC TC7WU04FUTE12RIC MC74ACT08DTR2 IC BA033FP-E2Display KEY-SW Main CONNECTOR, FFC 17P PIN, Connector 3PPIN, Connector 4P PLUG, Connector 10P DiodeAEP,UK,CIS IC SN74LVU04ANSRTransistor UN2211-TX Transistor UN2111-TXTRANSFORMER, Power CND ConnectorTRANSFORMER, Power SP,MY Composition Circuit BlockVOL-SEL Sony Corporation
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