Sony MDS-JE770 specifications Auto Check, Other Checks, Traverse Check, Traverse Waveform

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5-6-4. Auto Check

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up. To perform this test mode, the laser power must first be checked. Perform Auto Check after the laser power check and Iop compare.

Procedure

1.Press the YES button. If “LDPWR minicheck” is displayed, it means that the laser power check has not been performed. In this case, perform the laser power check and Iop compare, and then repeat from step 1.

2.If a disc is in the mechanical deck, it will be ejected forcibly. “DISC IN” will be displayed in this case. Load a test disc (MDW- 74/GA-1) which can be recorded.

3.If a disk is loaded at step 2, the check will start automatically.

4.When “XX CHECK” is displayed, the item corresponding to XX will be performed.

When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (MD) TDYS-1.

5.When the disc is loaded, the check will automatically be resumed from “07 CHECK”.

6.After completing to test item 12, check OK or NG will be displayed. If all items are OK, “CHECK ALL OK” will be displayed. If any item is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of the other spindle motor, thread motor, etc.

When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

5-6-5. Other Checks

All the following checks are performed by the Auto Check mode. They therefore need not be performed in normal operation.

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

5-6-6. Traverse Check

Connection :

Oscilloscope

BD board

CN105 pin 4 (TE)

CN105 pin 6 (VC)

V : 0.5 V/div

H : 10 ms/div

Input : DC mode

Checking Procedure:

1.Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin 6 (VC) of the BD board.

2.Load a test disc (MDW-74/GA-1). (Refer to Note 1.)

3.Press the M button and move the optical pick-up outside the pit.

4.Rotate the lAMS L knob and display “EF MO CHECK”.

5.Press the YES button and display “EFB = MO-R”.

(Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)

MDS-JE770

6.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the AMS knob. (Read power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

7.Press the YES button and display “EFB = MO-W”.

8.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the lAMS L knob.

(Write power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

9. Press the YES button display “EFB = MO-P”.

Then, the optical pick-up moves to the pit area automatically and servo is imposed.

10.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the lAMS L knob.

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

11.Press the YES button display “EF MO CHECK”(C14) The disc stops rotating automatically.

12.Press the A EJECT button and remove the disc.

13.Load the check disc (MD) TDYS-1.

14.Roteto the lAMS L knob and display “EF CD CHECK” (C15).

15. Press the YES button and display “EFB = CD”. Servo is imposed automatically.

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Contents 873-890-11 SpecificationsMDS-S50 MDM-7ASupplied accessories Genera l Power requirementsMDS-JE770 SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents Disassembly Table of ContentsDiagrams Exploded ViewsFlexible Circuit Board Repairing MDS-JE770 Section Service NotesIOP JIG for Checking BD Board WaveformRecord Precedure Optical PICK-UP Block Type Discrimination KSN-260EMain Board Component Side Checks Prior to Parts Replacement and AdjustmentsForced Reset Bit Binary Retry Cause Display ModeHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Button Descriptions MDS-JE770 Section GeneralDisassembly Flow MDS-JE770 Section DisassemblyFront Panel Section Two screws Main BoardOver Light Head HR901, BD Board Mechanism Deck Section MDM-7ALoading Motor Assy M103 Holder AssyOptical PICK-UP Sled Motor Assy M102, SliderSpindle Moter Assy M101 Precautions for USE of Test Mode MDS-JE770 Section Test ModeSetting the Test Mode Exiting the Test ModeSelecting the Test Mode MENU/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 MDS-JE770 Section Electrical AdjustmentsParts Replacement and Adjustment Auto Gain Control Output Level Adjustment flowPrecautions for USE of Optical PICK- UP KMS-260B/260E Precautions for Checking Laser Diode EmissionPrecautions for Adjustments Temp AdjustChecks Prior to Repairs Using the Continuously Recorded DiscOther Checks Auto CheckTraverse Check Traverse WaveformCD Error Rate Check Play Check MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Iop NV Save Traverse AdjustmentFocus 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 MDS-JE770 Section DiagramsFor printed wiring boards For schematic diagramsBD Board Main BoardIC190 Block Diagrams BD SectionIC171 IC1 2/2 Main SectionIC360 2/2 Semiconductor SemiconductorOVEROptical Pick UP Block Write HeadBoard Board Main Main Schematic Diagram Main /2 See page 51 for IC Block Diagrams IC1 Model is printed on diagramKB Board Display BoardKEY-SW Board HP BoardLED Drive Schematic Diagram Display SectionC951 C952 RY910D910 CN921 C924 LF900 C910Main Schematic Diagram Power SectionIC101 CXA2523AR BD Board IC Block DiagramsIC500 AK4524 Main Board Pin No Pin Name Description IC PIN Function DescriptionIC101 CXA2523AR RF Amplifier BD Board Pin No Pin Name Desription Asyo MvciAsyi AvddFfdr TfdrFrdr FS4ADA.RESET IIC PowerFldt FlckEPN ADA. LatchDINT1/H Clip ProtectSTB TimerBeep SW REC FlcsVDISP1 ResetVFL1 OSC0Chassis Section Section Exploded ViewsNot supplied Supplied with J790 FL750 With RV790 FL750 1-517-987-11 Indicator TUBE, FluorescentMechanism MDM-7A Motor ASSY, Spindle HEAD, Over LightMotor ASSY, Sled Motor ASSY, LoadingMDS-JE770 Section Electrical Parts List Metal Chip SwitchJumper Resistor ShortMDS-JE770 Display HP KB KEY-SW KEY-SW Main MDS-JE770 Main 2SD2144S-TP-UVW Resistor VOL-SEL MDS-JE770 Main PTMemo MDS-JE770 Revision History
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