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Sony MDS-JB920 service manual 21, Functions Of Other Buttons, Test Mode Displays

Models: MDS-JB920

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6. FUNCTIONS OF OTHER BUTTONS

6. FUNCTIONS OF OTHER BUTTONS

	Function	Contents
	á	Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo
	á	turns ON/OFF.
		turns ON/OFF.
	p	Stops continuous playback and continuous recording.
	)	The sled moves to the outer circumference only when this is pressed.
	0	The sled moves to the inner circumference only when this is pressed.
	SCROLL/CLOCK SET	Switches between the pit and groove modes when pressed.

	PLAY MODE	Switches the spindle servo mode (CLVS ÷CLV A).
	DISPLAY/CHAR	Switches the displayed contents each time the button is pressed
	¤ EJECT	Ejects the disc
	REPEAT	Exits the test mode

7. TEST MODE DISPLAYS

Each time the [DISPLAY/CHAR] button is pressed, the display changes in the following order.

1. Mode display

Displays “TEMP ADJUST”, “CPLAYMODE”, etc.

2. Error rate display

Displays the error rate in the following way. C = ¹¹¹¹AD = ¹¹¹¹

C = Indicates the C1 error. AD = Indicates ADER.

3. Address display

The address is displayed as follows. (MO: recordable disc, CD: playback only disc)

Pressing the [SCROLL/CLOCKÊSET] button switches between the group display and bit display. h = ¹¹¹¹ s = ¹¹¹¹ (MO pit and CD)

h = ¹¹¹¹ a = ¹¹¹¹ (MO groove) h = Indicates the header address.

s = Indicates the SUBQ address. a = Indicates the ADIP address.

Mode display

Error rate display

Address display

Auto gain display

(Not used in servicing)

Detrack check display (Not used in servicing)

IVR display

(Not used in servicing)

Note: “–” is displayed when servo is not imposed.

4.Auto gain display (Not used in servicing)

The auto gain is displayed as follows. AG = ¹¹/¹¹¹¹[ ¹¹

5.Detrack check display (Not used in servicing)

The detrack is displayed as follows. ADR = ¹¹¹¹¹¹¹

6.IVR display (Not used in servicing)

The IVR is displayed as follows.

[¹¹][¹¹][¹¹

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Sony MDS-JB920 service manual 21, Functions Of Other Buttons, Test Mode Displays, Auto gain display Not used in servicing

Contents

SERVICE MANUAL SPECIFICATIONSMDS-JB920 MINI DISC DECK– 2 – SELF-DIAGNOSISFUNCTION– 3 – Items of Error History Mode Items and ContentsTable of Error Codes Selecting the Test Mode6.DIAGRAMS TABLE OF CONTENTSSECTION SERVICING NOTES DISASSEMBLYFlexible Circuit Board Repairing – 5 –Notes on chip component replacement ADVARSELJIG FOR CHECKING BD BOARD WAVEFORM – 7 – Record PrecedureDisplay Precedure Forced Reset Checks Prior to Parts Replacement and Adjustments– 8 – ProcedureRetry Cause Display Mode – 9 –Precedure Fig. 1 Reading the Test Mode Display– 10 – Reading the DisplayHexadecimal nBinary Conversion Table – 11 – SECTION GENERALLOCATION OF CONTROLS • Front view • Rear view– 12 – – 13 – CASE – 14 –DISASSEMBLY SECTION– 15 – FRONT PANEL SECITONMAIN BOARD – 16 – MECHANISM SECTION MDM-5ASLIDER CAM – 17 – BASE UNIT MBU-5A,BD BOARDSW BOARD, LOADING MOTOR M103 2. SETTING THE TEST MODE 1. PRECAUTIONS FOR USE OF TEST MODESECTION TEST MODE – 18 –5. SELECTING THE TEST MODE – 19 –– 20 – 5-1.Operating the Continuous Playback Mode5-3. Non-VolatileMemory Mode EEP MODE 6. FUNCTIONS OF OTHER BUTTONS – 21 –7. TEST MODE DISPLAYS 4.Auto gain display Not used in servicingMEANINGS OF OTHER DISPLAYS – 22 –SECTION ELECTRICAL ADJUSTMENTS 1.PARTS REPLACEMENT AND ADJUSTMENT– 23 – 4. PRECAUTIONS FOR ADJUSTMENTS 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINONLaser power meter – 24 –6. CHECK PRIOR TO REPAIRS – 25 –6-1.Temperature Compensation Offset Check Checking Procedure6-5.C PLAY Checking MO Error Rate Check – 26 –CD Error Rate Check 6-4.Focus Bias Check9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT 7. INITIAL SETTING OF ADJUSTMENT VALUE10. LASER POWER ADJUSTMENT – 27 –Specification 11. TRAVERSE ADJUSTMENTAdjusting Procedure Connection– 29 – 12.FOCUS BIAS ADJUSTMENT15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT 13.ERROR RATE CHECK– 30 – 14. FOCUS BIAS CHECK– 31 – 16. ADJUSTING POINTS AND CONNECTING POINTSBD BOARD SIDE A BD BOARD SIDE BSECTION DIAGRAMS – 32 –6-1.IC PIN FUNCTION DESCRIPTION •BD BOARD IC121 CXD2654R – 33 –– 34 – – 35 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER – 36 –– 37 – – 38 – MDS-JB920 – 39 –– 40 – – 41 – BLOCK DIAGRAM – SERVO Section –– 42 – MDS-JB920– 43 – 6-3.BLOCK DIAGRAM – MAIN Section –– 44 – MDS-JB920– 46 – – 45 –• Circuit Boards Location Note on Schematic Diagram– 47 – 6-5.PRINTED WIRING BOARDS – BD Section –– 48 – •See page 45 for Circuit Boards Location– 50 – – 49 –MDS-JB920 Page– 51 – 6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•– 52 – MDS-JB920– 54 – – 53 –MDS-JB920 • Waveforms– 56 – – 55 –MDS-JB920 Page Page Page Page Page Page– 57 – – 58 –MDS-JB920 – 60 – – 59 –MDS-JB920 Page Page Page Page– 61 – – 62 –MDS-JB920 – 63 – MDS-JB920• Semiconductor Location MDS-JB920 – 66 –US, CND US, CND– 68 – – 67 –MDS-JB920 Page Page Page PagePRINTED WIRING BOARD – BD SWITCH Section – 6-15.SCHEMATIC DIAGRAM - BD SWITCH Section– 69 – – 70 –IC121 – 71 –CXD2654R IC152 BH6511FS-E2– MAIN Board – – 72 –IC100 CXD8607N– 73 – IC200CXD8767N SN74HC153ANS IC300IC700 LA5632– 75 – SECTION EXPLODED VIEWS1 CHASSIS SECTION 56 2 16 17 18– 76 – 2 FRONT PANEL SECTION 6359 58 3MECHANISM SECTION MDM-5A – 77 –223 207 203 225 206 201– 78 – 4BASE UNIT SECTION MBU-5A 252254 SECTION ELECTRICAL PARTS LIST AC BAT BD– 79 – – 80 – – 81 – DISP– 82 – MAINMAIN MAIN – 84 –MAIN – 85 –MAIN – 87 – SW VOLSony Corporation MDS-JB9209-922-869-11 Home A&V Products Company