Sony MDS-JE770 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

Page 34

MDS-JE770

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 l AMS L knob and display “CPLAY1 MODE”(C34).

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

4.The display changes to “C = AD = ”.

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

6.Press the MENU/NO button, stop playback, press the AEJECT button, 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 l AMS L knob and display “CPLAY1 MODE”(C34) .

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

4.The display changes to “C = AD = ”.

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

6.Press the MENU/NO button, stop playback, press the AEJECT button, 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 l AMS L knob and display “CPLAY1 MODE”(C34).

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

4. Press the

MENU/NO

button when “C =

AD = ” is

displayed.

 

5.Rotate the lAMS L knob and display “FBIAS CHECK” (C16).

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

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

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

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

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

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

Note 1 : If the C 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 lAMS L knob to display “AG Set (CD)” (C11).

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 AEJECT 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 lAMS L knob to display “AG Set (MO)” (C10).

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)”(C10).

4.Press the AEJECT button to remove the disc.

34

Page 33 Page 35
Image 34
Page 33 Page 35
Contents MDS-S50 Specifications873-890-11 MDM-7AMDS-JE770 Genera l Power requirementsSupplied accessories SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents Diagrams Table of ContentsDisassembly Exploded ViewsMDS-JE770 Section Service Notes Flexible Circuit Board RepairingJIG for Checking BD Board Waveform IOPRecord Precedure KSN-260E Optical PICK-UP Block Type DiscriminationForced Reset Checks Prior to Parts Replacement and AdjustmentsMain Board Component Side Retry Cause Display Mode Bit BinaryHigher Bits Lower Bits Hexa Details Bit When BinaryHexadecimal Binary MDS-JE770 Section General Button DescriptionsMDS-JE770 Section Disassembly Disassembly FlowFront Panel Section Main Board Two screwsMechanism Deck Section MDM-7A Over Light Head HR901, BD BoardHolder Assy Loading Motor Assy M103Sled Motor Assy M102, Slider Optical PICK-UPSpindle Moter Assy M101 Setting the Test Mode MDS-JE770 Section Test ModePrecautions for USE of Test Mode Exiting the Test ModeSelecting the Test Mode Operating the Continuous Playback Mode MENU/NOError rate display Test Mode DisplaysMode display Functions of Other ButtonsAutomatic SELF-DIAGNOSIS Function When Memory NG is DisplayedMeanings of Other Displays InformationParts Replacement and Adjustment MDS-JE770 Section Electrical AdjustmentsCheck before replacement Adjustment flow Auto Gain Control Output LevelPrecautions for Adjustments Precautions for Checking Laser Diode EmissionPrecautions for USE of Optical PICK- UP KMS-260B/260E Temp AdjustUsing the Continuously Recorded Disc Checks Prior to RepairsTraverse Check Auto CheckOther Checks Traverse WaveformFocus Bias Check Play Check MO Error Rate CheckCD Error Rate Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Traverse Adjustment Iop NV SaveFocus 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 MDS-JE770 Section Diagrams Circuit Boards LocationBD Board For schematic diagramsFor printed wiring boards Main BoardIC171 Block Diagrams BD SectionIC190 IC360 2/2 Main SectionIC1 2/2 Optical Pick UP Block SemiconductorOVERSemiconductor Write HeadBoard Board Main Main Schematic Diagram Main /2 See page 51 for IC Block Diagrams Model is printed on diagram IC1KEY-SW Board Display BoardKB Board HP BoardSchematic Diagram Display Section LED DriveD910 RY910C951 C952 CN921 C924 LF900 C910Schematic Diagram Power Section MainIC Block Diagrams IC101 CXA2523AR BD BoardIC500 AK4524 Main Board IC101 CXA2523AR RF Amplifier BD Board IC PIN Function DescriptionPin No Pin Name Description Pin No Pin Name Desription Asyi MvciAsyo AvddFrdr TfdrFfdr FS4Fldt IIC PowerADA.RESET FlckDINT1/H Clip ADA. LatchEPN ProtectBeep SW TimerSTB REC FlcsVFL1 ResetVDISP1 OSC0Section Exploded Views Chassis SectionFL750 1-517-987-11 Indicator TUBE, Fluorescent Not supplied Supplied with J790 FL750 With RV790Mechanism MDM-7A Motor ASSY, Sled HEAD, Over LightMotor ASSY, Spindle Motor ASSY, LoadingMDS-JE770 Section Electrical Parts List Jumper Resistor SwitchMetal Chip ShortMDS-JE770 Display HP KB KEY-SW KEY-SW Main MDS-JE770 Main 2SD2144S-TP-UVW Resistor MDS-JE770 Main PT VOL-SELMemo MDS-JE770 Revision History
Top Page Image Contents