Sony MDS-NT1 service manual Waveforms BD Board, 22.7 ns

Page 38

MDS-NT1

6-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

•Waveforms

– BD Board –

Note on Schematic Diagram:

•All capacitors are in ∝ F unless otherwise noted. pF: ∝∝ F 50 WV or less are not indicated except for electrolytics and tantalums.

•All resistors are in Ω and 1/4 W or less unless otherwise specified.

•f : internal component.

•C: panel designation.

Note: The components identified by mark 0or dotted line with mark 0are critical for safety.

Replace only with part number specified.

Note on Printed Wiring Boards:

•X: parts extracted from the component side.

•Y: parts extracted from the conductor side.

•f : internal component.

• : Pattern from the side which enables seeing. (The other layers' patterns are not indicated.)

Caution:
Pattern face side:	Parts on the pattern face side seen from
(Conductor Side)	the pattern face are indicated.
Parts face side:	Parts on the parts face side seen from
(Component Side)	the parts face are indicated.

1IC101 ek (RF) (PLAY mode)

1.4 Vp-p

5IC201 ef (LRCK) (PLAY mode)

4.5 Vp-p

qd IC505 4 (LRCK) (PLAY mode)

4 Vp-p

•A: B+ Line.

•B: B– Line.

•Power voltage is dc 9V and fed with regulated dc power supply from external power voltage jack.

•Voltages and waveforms are dc with respect to ground under no-signal conditions.

22.7 ns

22.7 ns

no mark : PLAYBACK

( ) : STOP

∗: Impossible to measure

•Voltages are taken with a VOM (Input impedance 10 MΩ ). Voltage variations may be noted due to normal produc- tion tolerances.

•Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc- tion tolerances.

•Circled numbers refer to waveforms.

•Signal path.

E : PLAY

l: REC

2 IC101 ef (FE) (PLAY mode)

6 IC201 eg (XBCK) (PLAY mode)

approx	4.6 Vp-p
460 mVp-p

qf IC505 2 (BICK) (PLAY mode)

3.6 Vp-p

354 ns

354 ns

	– MAIN Board –
3 IC101 wh (TE) (PLAY mode)	qa IC301 qa (XOUT)

approx

620 mVp-p

qg IC505 1 (MCLK)

3 Vp-p

4.2 Vp-p

100 ns

88 ns

4 IC201 w; (OSCO)

qs IC901 5 (DSPCLK)

2.6 Vp-p

4.2 Vp-p

qh IC400 7 (EXT)

9.1 Vp-p

11 ns

88 ns

15.8 ∝ s

38 38

Image 38

Contents Specifications MDS-NT1Playback Recording Cause/Remedy Indicator Green Red MDS-NT1 SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents MDS-NT1Table of Error Codes Error Code Details of ErrorDiagrams Table of ContentsDisassembly SELF-DIAGNOSIS FunctionFlexible Circuit Board Repairing MDS-NT1 Section Servicing Notes BD Board Conductor SideJIG for Checking BD Board Waveform Record Procedure Checks Prior to Parts Replacement and Adjustments in MD Criteria for Determination Measure if unsatisfactoryMicrocomputer Version Display Service ModeSoftware Reset System RequirementsMDS-NT1 Section General Front ViewMDS-NT1 Section Disassembly Disassembly FlowCase Upper Main Board MD Mechanism Deck MDM-7S2BFront Panel Section BD BOARD, Over Write Head HR901Holder Assy Loading Motor Assy M103Sled Motor Assy M102 Optical PICK-UP KMS-262ESpindle Motor Assy M101 Setting the Test Mode MDS-NT1 Section Test ModePrecautions for USE of Test Mode Releasing the Test ModeSelecting the Test Mode CheckOperating the Continuous Playback Mode Automatic SELF-DIAGNOSIS Function InformationCheck before replacement MDS-NT1 Section Electrical AdjustmentsParts Replacement and Adjustment Adjustment flow YESHOW to Identify Optical PICK-UP KMS- 262A/KMS-262E Precautions for Checking Laser Diode EmissionPrecautions for USE of Optical PICK- UP KMS-262A/262E KMS-262A KMS-262EPrecautions for Adjustments Laser power meterLaser Power Check Using the Continuously Recorded DiscTemperature Compensation Offset Check Checks Prior to RepairsTraverse Check Auto CheckOther Checks Focus Bias Check Play Check MO Error Rate CheckCD Error Rate Check Self-Recording/playback CheckLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjustment Recording and Displaying the IopTraverse Adjustment Iop NV SaveFocus Bias Adjustment ENTER/YES buttonCD Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjustment and Checking Loacation MDS-NT1 Section Diagrams Block Diagram Servo SectionBlock Diagram Main Section 36 aWaveforms BD Board 22.7 nsPrinted Wiring Board BD Board Semiconductor Location4AA 3AA Schematic Diagram BD Board 2/2 See page 38 for Waveforms B3B 2BBPrinted Wiring Board Main Board Component Side IC451Printed Wiring Board Main Board Conductor Side Main Board1AA AA2 AA3 GND Printed Wiring Board Panel Board Panel Board Conductor SideSchematic Diagram Panel Board IC Block Diagrams BD Board CXA2523ARIC401 BH6519FS-E2 Main BoardIC440 M54641L BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMP IC PIN Function DescriptionMNT2 Xbusy Xcas APC Main Board IC301 M30835FJGP-01 System Controller PLAY-SW Pin No Extal Section MDS-NT1 Exploded Views Case Section56 4-951-620-01 Screw 2.6X8, +BVTP 104 105 Case B Section102 101 103 317 303 307 311 310 319 304 308302 306 320 301 305 313 314 315 316 364 359358 357 360 356 355 354 362 359 352MDS-NT1 Section Electrical Parts List ResistorsDiode Switch MDS-NT1 MainFB1 MDS-NT1 Main Panel MiscellaneousMotor ASSY, Loading Revision History