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Sony MZ-R900 manual

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Table of contents for the manual

  • Page 1

    SERVICE MANUAL Audio pla ying system MiniDisc digi tal audio syste m Laser diode proper ties Material: GaAlAs W a ve lengt h: λ = 790 nm Emission durati on: continuous Laser output : less th an 44.6 µ W (This ou t put is the v alue me asured at a d i stanc e of 200 mm from the le ns surfac e on th e optic al pick-up b lock with 7 m m apertur e.) [...]

  • Page 2

    2 MZ-R900 T ABLE OF CONTENTS 1. SER VICING NOTES ............................................... 3 2. GENERAL ................................................................... 4 3. DISASSEMBL Y 3-1. Disassembly Flow ........................................................... 5 3-2. Panel Assy , Bottom .............................................[...]

  • Page 3

    3 MZ-R900 NO TES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suf fer electro- static break-do wn because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body . During repair , pay attention to electrostatic break-down and also use the pro[...]

  • Page 4

    4 MZ-R900 SECTION 2 GENERAL This section is e xtracted from instruction manual. 8 Looking at controls See pages in ( ) for more details. The recor der A END SEARCH bu tton (17) (47) B Battery compartment ( 13) C Jog lever (L ) ( MENU/ ENTE R ) (11) (20) (25 ) (34) (43) (53) D VOL +/– b utton (19) (47) E REC MODE button (23 ) F REC indica t or (29[...]

  • Page 5

    5 MZ-R900 • This set can be disassembled in the order sho wn below . 3-1. DISASSEMBL Y FLO W SECTION 3 DISASSEMBL Y Note: Follo w the disassembly procedure in the numerical order giv en. 3-2. P ANEL ASSY , BO TT OM 3-2. P ANEL ASSY , BO TT OM 3-3. P ANEL ASSY , UPPER SECTION SET 3-4. “LCD MODULE”, “P ANEL ASSY , UPPER” 3-6. “CASE ASSY ,[...]

  • Page 6

    6 MZ-R900 3-3. P ANEL ASSY , UPPER SECTION 3-4. “LCD MODULE”, “P ANEL ASSY , UPPER” 3 two screws (1.4) 4 panel assy, upper section 2 Push button (open). 3 two screw s (1.4) 1 flexible board (CN801) 1 four screws (1.7) 3 button (A), control Note: On installation, adjust the hole of “ button (A), control ” and boss of “ panel assy, uppe[...]

  • Page 7

    7 MZ-R900 3-5. MAIN BO ARD ASSY 3-6. “CASE ASSY , B A TTER Y”, “MAIN BO ARD” 3 four screws (M1.4 toothed lock) 4 screw (1.4) 2 flexible board (CN502) 1 Remove two solder s of flexible board. 6 flexible board (CN501) 5 7 main board assy 2 case assy, battery 3 main board 1 Remove the solder of terminal (minus). 1 Remove the solder of terminal[...]

  • Page 8

    8 MZ-R900 3-7. STRIP , ORNAMENT AL 3-8. “MD MECHANISM DECK (MT -MZR900-171)”, “CHASSIS ASSY , SET” ) ) ) ) @ @ 4 two convex portions pointed with @ 3 three bosses 5 Remove the “ strip, ornamental ” in the direction of arrow C . 2 Open toward the direction B to disengage two bosses and convex portions pointed with * . 2 Open toward the d[...]

  • Page 9

    9 MZ-R900 3-9. SER VICE ASSY , OP (LCX-4R) 0 bearing (N) 5 screw 4 spring (S), rack 3 screw (M1.4) 1 washer (0.8-2.5) 2 gear (SA) 6 screw (M1.4) 7 spring, thrust 9 Pull off “ screw, lead ” 8 over write head section service assy, OP (LCX-4R) qa Opening the over write head toward the direction A , remove the “ service assy, OP (LCX-4R) toward t[...]

  • Page 10

    10 MZ-R900 3-10. HOLDER ASSY 3-11. MO T OR FLEXIBLE BO ARD 2 Push the convex portion toward the direction B and open the holder assy toward the direction A to erect uprightly. 3 Remove the concave portion in the direction of arrow C . 5 Remove the holder assy in the direction of arrow D . D C B A 1 Open the holder assy. 4 boss 1 Remove four solders[...]

  • Page 11

    11 MZ-R900 5 motor, DC (spindle) (M601) 4 three screws (M1.4) 1 Remove six solders of motor flexible board. qa motor, DC (over write head up/down) (M603) 6 two screws (M1.4) qs chassis assy, gear 9 screw (M1.2) 0 gear (HA) gear (HA) chassis assy, gear 2.65 mm motor, DC (over write head up/down) (M603) 8 gear (HB) 7 washer (0.8-2.5) 2 washer (0.8-2.[...]

  • Page 12

    12 MZ-R900 888 003 V1.000 Microcomputer version display Destination code 002 : Except US, Canadian models 003 : US, Canadian models All off All lit BASS12 C830 + L801 C809 + C813 C801 11 12 241 5 10 48 3 1 6 7 2 29 9 4 19 18 95 96 22 8 27 34 15 21 38 17 23 40 16 28 26 20 25 42 24 113 51 30 31 45 36 35 47 50 44 53 49 59 56 54 55 61 57 62 58 60 68 63[...]

  • Page 13

    13 MZ-R900 Configuration of T est Mode Manual Mode Mode to adjust or check the operation of the set by function. Normally , the adjustment in this mode is not executed. Howe ver , the Manual mode is used to clear the memory , po wer supply adjustment, and laser power c heck before performing automatic adjustments in the Overall Adjustment mode. •[...]

  • Page 14

    14 MZ-R900 Self-Diagnosis Result Displa y Mode This set uses the self-diagnostic function system in which if an error occurred during the recording or playing, the mechanism control block and the po wer supply control block in the microcomputer detect it and record its cause as history in the non vola tile memory . By checking this history in the t[...]

  • Page 15

    15 MZ-R900 • Description of Indication History Histor y code number Description 1 The f irst error N The last error N1 One error before the last. N2 T wo errors before the last. R_ T otal recording time Reset the error displa y code After servicing, reset the error display code. • Setting method of Reset the Error Displa y Code 1. Setting the t[...]

  • Page 16

    16 MZ-R900 4. When all the keys on the set and on the remote commander are considered as OK, the following displa ys are shown for 4 sec- onds. Example1: W hen the keys on the set are considered as OK: Example2: When the ke ys on the remote commander are con- sidered as OK: 5. When all keys w ere checked or if the upper panel is opened, the key c h[...]

  • Page 17

    17 MZ-R900 • Setting method of NV reset 1. Select the manual mode of the test mode, and set item number 021NV Reset (see page 13). 2. Press the X key . 3. Press the X key once more. 4. Press the x ke y to quit the manual mode, and activ ate the test mode (display check mode). • Change of Adjusted V alues On the set having the microcomputer v er[...]

  • Page 18

    18 MZ-R900 • Adjustment method of Vc PWM Duty (L) (item number: 762) 1. Connect a digital voltmeter to the AP914 (VC) on the MAIN board, and adjust [VOL +] key (voltage up) or [VOL - -] key (voltage do wn) so that the v oltage becomes 2.40 V . 2. Press the X key to write the adjusted v alue . (The item number changes to 763 when X key is pressed)[...]

  • Page 19

    19 MZ-R900 7. Press the N key , and set the laser CD read adjustment mode (item number 012). 8. Check that the laser po wer meter reading is 0.97 ± 0.10 mW . 9. Check that the voltage both ends (TP (+) and TP ( – )) of resistor R521 at this time is belo w 44 mV . 10. Press the N key , and set the laser MO write adjustment mode (item number 013).[...]

  • Page 20

    20 MZ-R900 > key . key Overall adjustment mode (Title display) CD overall adjusting CD overall adjustment OK MO overall adjusting MO overall adjustment OK CD overall adjustment NG MO overall adjustment NG All item OK Protect switch ON Protect switch OFF [JOG LEVER $L% ] (up) key or [DISPLAY] key on the remote commander NG item exists or x key NG[...]

  • Page 21

    21 MZ-R900 8. If OK through the overall MO adjustments, press the x key to return to the test mode and terminate the Overall Adjustment mode. 6. Insert MO disc in the set, and press the > key to set the Overall MO Adjustment mode. Automatic adjustments are made. • Overall CD and MO adjustment items 1. Overall CD adjustment items Item No. Descr[...]

  • Page 22

    22 MZ-R900 Resume Clear Perform the Resume clear when all adjustments completed. • Resume Clear Setting Method 1. Select the manual mode of the test mode, and set item number 043 (see page 13). 2. Press the X key . 3. Press the x key to r eturn to the test mode (display check mode). P atch Data Re writing When Non v olatile Memory was Replaced On[...]

  • Page 23

    23 MZ-R900 34. Adjust with the [VOL+] key (adjusted v alue up) or [VOL- -] key (adjusted v alue do wn) so that the adjusted v alue becomes 20. 35. Press the X key . (0D65 is blinking) 36. Press the [DISPLAY] key on the remote commander for se v- eral seconds (about 3 seconds) to exit the patch data write mode (to return to the manual mode display i[...]

  • Page 24

    24 MZ-R900 23. Press the [VOL+] ke y once to change the blinking portion to 0D65. 24. Press the x key . (00 is blinking) 25. Adjust with the [VOL+] key (adjusted v alue up) or [VOL- -] key (adjusted v alue down) so that the adjusted v alue becomes 1C. 26. Press the X key . (0D65 is blinking) 27. Press the [VOL+] ke y once to change the blinking por[...]

  • Page 25

    25 MZ-R900 023 0D6909 Remote commander LCD display 09 :Adjusted value 023 0D6CF6 Remote commander LCD display F6 :Adjusted value 023 0D6D00 Remote commander LCD display 00 :Adjusted value 023 0D6D1C Remote commander LCD display 1C :Adjusted value 023 0D6E00 Remote commander LCD display 00 :Adjusted value 023 0D6E03 Remote commander LCD display 03 :[...]

  • Page 26

    26 MZ-R900 023 0D7603 Remote commander LCD display 03 :Adjusted value 023 0D7800 Remote commander LCD display 00 :Adjusted value 023 0D7801 Remote commander LCD display 01 :Adjusted value 023 0D7900 Remote commander LCD display 00 :Adjusted value 023 0D79E0 Remote commander LCD display E0 :Adjusted value 023 Patch 01 Remote commander LCD display 01[...]

  • Page 27

    MZ-R900 27 27 SECTION 6 DIA GRAMS 6-1. BLOCK DIA GRAM – SER V O Section – 33 29 28 41 42 1 44 21 31 26 25 43 24 23 4 8 9 10 11 12 14 5 6 13 7 18 19 JX JY JX IX IY IY IX JX JY A B C D MON IX A B CD OPTICAL PICK-UP BLOCK (LCX-4R) HR601 OVER WRITE HEAD S0 S1 D D-C PD-NI PD-O C B A VREF A-C JY JX IX IY RF AMP, FOCUS ERROR, TRACKING ERROR TPP/WPP AP[...]

  • Page 28

    MZ-R900 28 28 6-2. BLOCK DIA GRAM – AUDIO Section – VC B+ F801 F RMC KEY RVDD DTCK CDWM 2V CDWM DA T A KEY -R RGND (LINE IN JACK) OPTICAL RECEIVER J302 i /LINE OUT J301 LINE IN (OPT) J303 MIC (PLUG IN POWER) • SIGNAL PATH : PLAYBACK : REC (ANALOG IN) : REC (DIGITAL IN) 2 11 13 5 4 16 10 9 12 13 3 1 14 15 16 183 186 178 AOUT SEL 143 142 144 14[...]

  • Page 29

    MZ-R900 29 29 29 29 29 29 7 4 56 52 54 55 1 2 3 5 20 86 169 236 235 234 17 18 19 6 10 49 24 25 39 44 38 42 40 41 35 22 23 26 46 47 50 28 32 34 11 14 10 15 22 16 19 20 51 54 55 21 8 9 26 49 47 46 45 43 44 56 50 48 33 36 45 18 19 16 12 10 9 27 53 + – 15 164 165 8 163 48 11 237 238 16 171 10 216 1 208 13 14 228 170 205 206 187 182 230 3 227 VB HEADP[...]

  • Page 30

    MZ-R900 29 29 29 29 29 29 7 4 56 52 54 55 1 2 3 5 20 86 169 236 235 234 17 18 19 6 10 49 24 25 39 44 38 42 40 41 35 22 23 26 46 47 50 28 32 34 11 14 10 15 22 16 19 20 51 54 55 21 8 9 26 49 47 46 45 43 44 56 50 48 33 36 45 18 19 16 12 10 9 27 53 + – 15 164 165 8 163 48 11 237 238 16 171 10 216 1 208 13 14 228 170 205 206 187 182 230 3 227 VB HEADP[...]

  • Page 31

    MZ-R900 30 30 30 30 30 30 R831 C808 C807 R806 C804 R807 C835 R619 R607 C834 C613 C619 R610 R606 C629 C630 R809 R808 C802 C812 C818 R817 C814 R814 R845 R840 R838 R812 R810 R802 R803 R801 C621 R613 R837 R839 C806 R828 C819 R829 C820 C833 R804 C805 R833 R835 C803 R805 C823 R830 C522 C560 C552 C551 C512 C554 + C553 + C556 + C555 + C558 C559 C557 R604 R[...]

  • Page 32

    MZ-R900 31 31 31 31 31 31 6-5. SCHEMA TIC DIA GRAM • See page 33 for Wavef orms. • See page 43 for IC Bloc k Diagrams[...]

  • Page 33

    MZ-R900 32 32 32 32 32 32 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 54 55 56 1 53 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 23 25 26 27 28 VB BATM CHGSW RS INP2 INM2 RF2 DCIN CHGMON SVREF GAIN CHG DREG GND SW RECON OE CLK RI FI EFM VIO VC V RECO1 LI1 PGND1 PGND1 LI1 VRECO2 VREC DTC INP1 INM1 RF1 DW TP D[...]

  • Page 34

    MZ-R900 32 32 32 32 32 32 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 54 55 56 1 53 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 23 25 26 27 28 VB BATM CHGSW RS INP2 INM2 RF2 DCIN CHGMON SVREF GAIN CHG DREG GND SW RECON OE CLK RI FI EFM VIO VC V RECO1 LI1 PGND1 PGND1 LI1 VRECO2 VREC DTC INP1 INM1 RF1 DW TP D[...]

  • Page 35

    33 MZ-R900 6-6. IC PIN FUNCTION DESCRIPTION • IC501 SN761057DBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin Name I/O Description 1 TE O Tracking error signal output to the system controller (IC801) 2 REXT — Connect terminal to the external resistor for ADIP amp control 3 WPPLPF — Connect terminal to the external capacitor for TPP/WPP low-p[...]

  • Page 36

    34 MZ-R900 • IC801 CXD2671-202GA (SYSTEM CONTROLLER, DIGITAL SIGNAL PROCESSOR, 16M BIT D-RAM) Pin No. Pin Name I/O Description 1 PAUSE KEY I Set key input terminal ( X key input) 2 MIC SENSE O Control signal output to the microphone amp (IC303) “ H ” : HIGH, “ L ” : LOW, normally: “ H ” 3 XTEST I Input terminal for the test mode set u[...]

  • Page 37

    35 MZ-R900 Pin No. Pin Name I/O Description 47 FE I Focus error signal input from RF amp (IC501) 48 AUX1 I Support signal (I 3 signal/temperature signal) input terminal (A/D input) 49 VC I Middle point voltage (+1.2V) input terminal 50 ADIO O Monitor output of A/D converter input signal Not used (open) 51 ADRT I A/D converter the upper limit voltag[...]

  • Page 38

    36 MZ-R900 Pin No. Pin Name I/O Description 91 DSPVDD2 — Power supply terminal (for DSP block) (+1.5V) 92 DSPVSS1 — Ground terminal (for DSP block) 93 SPCU I Spindle motor drive comparison signal input (U) from the motor driver (IC551) 94 SPCV I Spindle motor drive comparison signal input (V) from the motor driver (IC551) 95 SPCW I Spindle moto[...]

  • Page 39

    37 MZ-R900 Pin No. Pin Name I/O Description 156, 157 TEST1, TEST0 I Input terminal for the main test (normally fixed at “ L ” ) 158 EVA I EVA/FLASH chip discrimination terminal “ L ” : FLASH chip, “ H ” : EVA chip 159 NC O Not used (open) 160 SSB DATA I/O Input/output of SSB serial data with RF amp (IC501) 161 SSB CLK O SSB serial clock[...]

  • Page 40

    38 MZ-R900 Pin No. Pin Name I/O Description 204 XPD ADA O Power supply control signal output for the drive to A/D, D/A converter (IC301) 205 XCS LCD O Chip select signal output to the liquid crystal display element 206 LCD STB O Strobe signal output to the liquid crystal display element 207 LCD RST O Reset control signal output to the liquid crysta[...]

  • Page 41

    39 MZ-R900 7-1. P ANEL SECTION SECTION 7 EXPLODED VIEWS • Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. • The mechanical parts with no reference num- ber in the exploded vie ws are not supplied. • Accessor ies and packing materials are gi ve[...]

  • Page 42

    40 MZ-R900 7-2. CHASSIS SECTION Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark MT-MZR900-171 not supplied 51 52 53 73 71 54 60 68 70 53 58 56 72 55 55 57 59 61 63 62 74 51 3-220-477-01 SHEET (MD), INSULA TING 52 X-3379-320-5 CHASSIS ASSY , SET 53 4-218-233-07 SCREW (1.4), MI 54 3-224-089-01 SHEET (TERMINAL), INSULA TING 5[...]

  • Page 43

    41 MZ-R900 7-3. MD MECHANISM DECK SECTION (MT -MZR900-171) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark M603 M601 M602 not supplied 101 102 105 106 107 108 109 115 122 121 119 118 117 120 118 103 104 110 123 111 109 112 103 109 114 113 115 109 116 103 A A B B 101 X-3379-498-1 HOLDER ASSY 102 3-224-779-01 SPRING, THRUST [...]

  • Page 44

    42 MZ-R900 SECTION 8 ELECTRICAL P ARTS LIST Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark MAIN NO TE: • Due to standardization, replacements in the parts list may be different from the parts speci- fied in the diagrams or the components used on the set. • -XX and -X mean standardiz ed parts, so they may hav e some di[...]

  • Page 45

    Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 43 MZ-R900 MAIN C519 1-164-940-11 CERAMIC CHIP 0.0033uF 10% 16V C521 1-125-777-11 CERAMIC CHIP 0.1uF 10% 10V C522 1-125-777-11 CERAMIC CHIP 0.1uF 10% 10V C523 1-125-837-11 CERAMIC CHIP 1uF 10% 6.3V C524 1-117-919-11 T ANT ALUM CHIP 10uF 20% 6.3V C526 1-125-777-11 CERAMIC CHIP[...]

  • Page 46

    Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 44 MZ-R900 MAIN @ Replacement of CXD2671-203GA (IC801) used in this set requires a special tool. D602 8-719-081-33 DIODE MA2YD1500LS0 D603 8-719-081-34 DIODE RB160M-30TR D605 8-719-081-34 DIODE RB160M-30TR D606 8-719-081-35 DIODE MA2YD1700LS0 D607 8-719-081-33 DIODE MA2YD1500[...]

  • Page 47

    Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 45 MZ-R900 MAIN R606 1-218-949-11 RES-CHIP 470 5% 1/16W R607 1-218-945-11 RES-CHIP 220 5% 1/16W R608 1-218-983-11 RES-CHIP 330K 5% 1/16W R609 1-219-724-11 MET AL CHIP 1 1% 1/4W R610 1-218-990-11 SHORT 0 R611 1-218-990-11 SHORT 0 R613 1-218-957-11 RES-CHIP 2.2K 5% 1/16W R619 1[...]

  • Page 48

    Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 46 MZ-R900 1-476-395-11 REMOTE CONTROL UNIT (RM-MC11EL) 0 1-476-275-11 ADAPTOR, AC (AC-MZR55) (AEP , E13, FR, EE) 0 1-476-277-11 ADAPTOR, AC (AC-MZR55) (UK, HK) 0 1-476-278-11 ADAPTOR, AC (AC-MZR55) (AUS) 0 1-476-279-11 ADAPTOR, AC (AC-MZR55) (US, CND) 0 1-569-007-11 ADAPTOR,[...]

  • Page 49

    47 MZ-R900 MEMO[...]

  • Page 50

    MZ-R900 REVISION HIST OR Y Clicking the ver sion allows y ou to jump to the re vised page. Also, clicking the v ersion at the upper right on the re vised page allo ws you to jump to the ne xt re vised page. V er . Date Description of Revision 1.2 2001.03 Addition of Destination (US, Canadian Model) 1.1 2000.12 Addition of Destination (AEP , UK, Aus[...]