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MDS-JE470
SERVICE MANUAL
US Model
Canadian Model
AEP Model
UK Model
Ver 1.0 2001. 05
E Model
Australian Model
US and foreign patents licensed form Dolby Laboratories Model Name Using Similar Mechanism MDS-S50
Licensing Corporation.
MD Mechanism Type MDM-7A
Optical Pick-up Type KMS-260B/260E
SPECIFICATIONS
Inputs
System MiniDisc digital audio
system
ANALOG IN Jack type: phono
Disc MiniDisc
Impedance: 47 kilohms
Laser Semiconductor laser
Rated input: 500 mVrms
( λ = 780 nm) Emission
Minimu
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MDS-JE470 General Supplied accessories Power requirements Audio connecting cords (2) U.S.A. and Canadian models: Optical cable (1) 120 V AC, 60Hz Remote commander (remote) (1) European model: 230 V AC, 50/60Hz R6 (size-AA) batteries (2) Australian model: 240 V AC, 50/60Hz Hong Kong model: 220 – 240 V AC, 50/60Hz US and foreign patents licensed from Dolby Other models: 110 – 120/220 – 240 V Laboratories. AC, 50/60Hz Design and specifications are subject to change Adjustable with voltage witho
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MDS-JE470 1. While pressing the lAMSL knob and x button, connect the power plug to the outlet, and release the lAMSL knob and x button. When the test mode is set, “[Check]” will be displayed. 2. Rotate the lAMSL knob and when “[Service]” is displayed, press the YES button. 3. Rotate the lAMSL knob and display “Err Display”. 4. Pressing the YES button sets the error history mode and displays “op rec tm”. 5. Select the contents to be displayed or executed using the lAMSL knob. 6.
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MDS-JE470 Display History Mode for erasing the total spdl rp tm time spdl change These histories are based on the time of replacement of the spindle motor. If the spindle motor has been replaced, perform this procedure and erase the history. Procedure 1. Press the lAMSL knob when displayed as “spdl change” 2. Press the YES button when the display changes to “spdl change?” When “Complete!” is displayed, it means erasure has completed. Table of Error Codes TABLE OF CONTENTS Error Code Descript
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MDS-JE470 SECTION 1 SERVICE NOTES SAFETY CHECK-OUT NOTES ON HANDLING THE OPTICAL PICK-UP (US model only) BLOCK OR BASE UNIT After correcting the original service problem, perform the fol- The laser diode in the optical pick-up block may suffer electrostatic lowing safety checks before releasing the set to the customer: break-down because of the potential difference generated by the Check the antenna terminals, metal trim, “metallized” knobs, screws, charged electrostatic load, etc.
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MDS-JE470 JIG FOR CHECKING BD BOARD WAVEFORM The special jig (J-2501-196-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be performed are shown as follows. GND : Ground I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser) IOP : For measuring IOP (Check the deterioration of the optical pick-up laser) TE : TRK error signal (Traverse adjustment) VC : Reference level for checking the signal RF : RF signal (Check jitt
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MDS-JE470 Iop DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF BD BOARD) ARE REPLACED The Iop value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record the Iop value on the optical pick-up according to the following procedure. Record Precedure: 1. W
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MDS-JE470 OPTICAL PICK-UP BLOCK TYPE DISCRIMINATION There are two types of the optical pick-up block in this model. These are compatible except for the laser power. Check the type of the optical pick-up block before replacement. Ajdust following items after replacing the optical pick-up block. • 5-6-2. Laser Power Check (See page 28) • 5-10. LASER POWER ADJUSTMENT (See page 31) Differences KMS-260B KMS-260E Color of the adhesive agent at PDIC portion Pink White Form of FPC retainer plate
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MDS-JE470 CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”. • 5-6-2. Laser power check (see page 28) • 5-6-3. Iop Compare (see page 28) • 5-6-4. Auto Check (see page 29) Note: The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
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MDS-JE470 RETRY CAUSE DISPLAY MODE • In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the “track mode” for obtaining track information will be set. This is useful for locating the faulty part of the unit. • The following will be displayed : During recording and stop : Retry cause, number of retries, and number of retry errors. During playback : Information such as type of disc played, part played, copyright.
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MDS-JE470 Reading the Display: Convert the hexadecimal display into binary display. If more than two causes, they will be added. Example When 42 is displayed: Higher bit : 4 = 0100 t b6 Lower bit : 2 = 0010 t b1 In this case, the retry cause is combined of “CLV unlock” and “ader5”. When A2 is displayed: Higher bit : A = 1010 t b7+b5 Lower bit : 2 = 0010 t b2 The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”. Reading the Track Mode Display Higher Bits Lower
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MDS-JE470 SECTION 2 GENERAL This section is extracted from instruction manual. Parts Identification The items are arranged in alphabetical order. Refer to the pages indicated in parentheses ( ) for details. Main unit 4 6 9 0 qa 1 2 3 5 7 8 qs qd STANDBY EJECT MENU/ MDLP NO YES AMS TIMER GROUP REC REC OFF PLAY ON/OFF SKIP TIME INPUT REC MODE CLEAR PHONES PHONE LEVEL PC LINK PUSH ENTER LEVEL/ PLAY MODE REPEAT DISPLAY/CHAR MIN MAX (KEYBOARD) wh qg qh qj qkql w; wa wd wf wg qf ws 1) AMS wh (15) (2
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MDS-JE470 SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. DISASSEMBLY FLOW • Abbreviation SP : Singapore SET 3-2 UPPER CASE (408226) 3-5 PT BOARD 3-6 MECHANISM DECK 3-3 FRONT PANEL 3-4 MAIN BOARD VOL-SEL BOARD (SP model) SECTION (MDM-7A) SECTION 3-7 OVER LIGHT HEAD 3-7 BD BOARD (HR901) 3-8 HOLDER ASSY 3-7 BD BOARD 3-8 HOLDER ASSY 3-10 SLED MOTOR 3-9 LOADING MOTOR 3-11 OPTICAL PICK-UP ASSY (M102) ASSY (M103)
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MDS-JE470 3-2. UPPER CASE (408226) 2 Case (408226) 1 Two screws (CASE 3TP2) 1 Screw (CASE 3TP2) 1 Two screws (CASE 3TP2) 3-3. FRONT PANEL SECTION 3 Connector (CN830) 5 Claw 2 Connector (CN390) 1 Wire (flat type) (17core) (CN3) 4 Two screws 5 Claw (+BVTP3x8) 6 Front panel 4 Two screws (+BVTP3x8) 14
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MDS-JE470 3-4. MAIN BOARD 6 Two screws (+BVTP3x8) 3 Connector (CN400) 2 Wire (flat type) (23core) (CN1) 1 Wire (flat type) (27core) (CN2) 7 MAIN board 4 Two screws (+BVTP3x8) 5 screw (+BVTP3x8) 3-5. PT BOARD, VOL-SEL BOARD (SP model) 3 Three screws (+PTTWH M3) 5 PT board 1 Connector (CN900) 6 Two screws (+BVTP3x8) (SP model) 2 Connector (CN990) (SP model) 7 VOL-SEL board (SP model) 4 Nylom rivet (dia 3) 15
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MDS-JE470 3-6. MECHANISM DECK SECTION (MDM-7A) 3 Mechanism deck 2 Two step screws (+BVTTWH M3) 2 Two step screws (+BVTTWH M3) 1 Harness 3-7. OVER LIGHT HEAD (HR901), BD BOARD Note 1: If you disconnect the connector (CN104), you can remove the BD board without removing the over write head (HR901). 2 Screw (P1.7X6) Note 2: Be careful to handle the over write head (HR901) because it is easy to be damaged. 3 Head, over light (HP901) 4 Remove the solder (four portion) 8 BD board 6 1 Connect
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MDS-JE470 3-8. HOLDER ASSY 2 Claw 3 6 Holder ASSY 5 4 Boss 4 Boss 1 Spring (holder), tension 3-9. LOADING MOTOR ASSY (M103) 1 Belt (loading) 2 Two screws (PWH1.7x2.5) 3 Motor ASSY, loading (M103) 17
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MDS-JE470 3-10. SLED MOTOR ASSY (M102), SLIDER 5 Remove the claw. Shift the slider in the arrow direction. A 3 4 Slider (EJ) A 8 Lever (head) 6 Slider 1 Two screws (BTP2X6) 2 Guide (L) 9 Two screws (PWH1.7X2.5) 7 Lever (CHG) 0 Motor ASSY, sled (M102) 3-11. OPTICAL PICK-UP qa Optical pick-up (KMS-260B/260E) 1 FLEXIBLE board 7 Main shaft 0 SL base 9 Screw (P1.7X6) 6 Two screws (K2X6) 8 4 Screw (BTP2X6) 5 Base (BU-A) 3 Gear (SD) 2 Screw (M1.7), tapping 18
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MDS-JE470 3-12. SPINDLE MOTER ASSY (M101) 2 Spindle motor ASSY (M101) 1 Three screws (M1.7), tapping 19
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MDS-JE470 SECTION 4 TEST MODE 4-1. PRECAUTIONS FOR USE OF TEST MODE • As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is stopped before setting and removing it. Even if the A EJECT button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not stop rotating. Therefore, it will be ejected while rotating. Be sure to press the A EJECT button after pressi
