sony_MDX-C7900R_service_manual 维修电路图.pdf

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1、SERVICE MANUAL MDX-C7900 FM/AM MINIDISC PLAYER MDX-C7900R FM/MW/LW MINIDISC PLAYER US Model Canadian Model E Model MDX-C7900 AEP Model UK Model MDX-C7900R Model Name Using Similar MechanismNEW Base Mechanism TypeMG-164KT-138 Optical Pick-Up NameKMS-241A/J2N SPECIFICATIONS MDX-C7900/C7900R Refer to R

2、M-X4S Service Manual (9-925- 698-) issued previously for information of remote commander (RM-X4S) supplied with this set. Photo: MDX-C7900 Continued on next page 9-925-787-12Sony Corporation 2001H0500-1e Vehicle Company C 2001.8Shinagawa Tec Service Manual Production Group Ver 1.1 2001.08 收音机爱好者资料库

3、Ra d i o Fa n s .CN 2 TABLE OF CONTENTS 1.SERVICE NOTE. 3 2.GENERAL Location of Controls (MDX-C7900).4 Location of Controls (MDX-C7900R) . 5 Resetting the Unit . 6 Detaching the Front Panel. 6 Preparing the Rotary Commander .6 Setting the Clock.6 Installation (US, Canadian) .7 Installation (AEP, UK,

4、 E) . 8 Connections. 10 3.DISASSEMBLY. 13 4.ELECTRICAL ADJUSTMENTS Test Mode . 18 MD Section . 18 Tuner Section . 18 5.DIAGRAMS 5-1.Block Diagram SERVO Section . 21 5-2.Block Diagram MAIN Section . 23 5-3.Block Diagram DISPLAY/KEY CONTROL Section . 25 5-4.Block Diagram BUS CONTROL/POWER SUPPLY Secti

5、on . 27 5-5.Printed Wiring Boards MECHANISM DECK Section . 29 5-6.Schematic Diagram MECHANISM DECK Section . 31 5-7.Schematic Diagram MAIN Section . 35 5-8.Printed Wiring Board MAIN Section . 39 5-9.Printed Wiring Board PANEL Section . 43 5-10. Schematic Diagram PANEL Section . 45 5-11. IC Pin Funct

6、ion Description . 55 6.EXPLODED VIEWS. 64 7.ELECTRICAL PARTS LIST.68 Ver 1.1 收音机爱好者资料库 Ra d i o Fa n s .CN 3 Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur- ing repairing. Do not touch the soldering iron on the same conductor of the circuit board (within

7、 3 times). Be careful not to apply force on the conductor when soldering or unsoldering. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COM

8、POSANTS IDENTIFIS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PICES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. SAFETY-RELATED COMPONENT WAR

9、NING! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. CAUTION Use of controls o

10、r adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. SECTION 1 SERVICE NOTE Type A/B Discrimination MAIN BOARD (Component Side) IC700 MB90574PFV-G-113-BND (C7900R: Type A) MB90574PFV-G-114-BND (C7900: Type A) MB90F574PFV-G-113 (C7

11、900R: Type B) MB90F574PFV-G-114 (C7900: Type B) 收音机爱好者资料库 Ra d i o Fa n s .CN 4 SECTION 2 GENERAL This section is extracted from instruction manual. 5 6 7 8 9 10 11 12 13 FRONT PANEL COVER ASSY, PANEL (SUB) ASSY Note: Follow the disassembly procedure in the numerical order given. SECTION 3 DISASSEMB

12、LY 1 Push the button (release). 2 3 Remove the front panel of the arrow. 3four screws (PTT2.6 6) 3screw (PTT2.6 6) 1 1 2cover assy 4panel (sub) assy 14 MECHANISM DECK (MG-164KT-138) MAIN BOARD 1two screws (PTT2.6 4) 2mechanism deck (MG-164KT-138) 5insulating sheet 4main board 3three screws (PTT2.6 6

13、) (ground point) 1two screws (PTT2.6 10) 2heat sink 1eight screws (PTT2.6 10) 15 SERVO BOARD FLOAT BLOCK 3two screws (BVTT2 4) 1sensor flexible board (CN102) 3two screws (BVTT2 4) 2flexible board (CN103) 4servo board 3spring (FL2) 1four screws (BVTT2 4) Release of the lock. float block A 5Pushing an

14、 arrw A part, raise the float block up ward at the front to release a lock. 3spring (FL2) 2MD cover assy 4two springs (FL) lever (lock R) lever (lock L) 16 OPTICAL PICK-UP (KMS-241A/J2N) HOLDER ASSY 4washer (M) 5holder assy 1spring (CHKG) 2stop ring E (1.5) 3lever (lock R) 3lever (lock L) 2stop ring

15、 E (1.5) 1spring (CHKG) 6bearing (SL) 5feed screw assy 3screw (K2 3) 2shaft (SL2) 1two screws (K2 3) 7optical pick-up (KMS-241A/J2N) 4screw (B2 3) 17 MOTOR ASSY (M901, M902, M903), SENSOR BOARD 1Remove the solders of motor (M901, M902, M903). 3sensor board 2two screws (2 8) 8base (SL) 7screw (B2 3)

16、6motor assy (M902) 5bracket (SL) 4screw (P1.7 1.8) !screw (P2 2.2) !motor assy (M903) 0motor assy (M901) 9two screws (P1.7 1.8) 18 SECTION 4 ELECTRICAL ADJUSTMENTS TEST MODE This set have the test mode function. In the test mode, FM Auto Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments c

17、an be performed easier than it in ordinary procedure. 1.Set the “power select” switch (S700) is “A (ON)” position. 2.Turn ON the regulated power supply. (All LEDs on the set lights up, and the clock is displayed.) Note: Press theOFFbutton, if the clock is not displayed. 3.Push the preset 4 button. 4

18、.Push the preset5button. 5.Press the preset1button for more than two seconds. 6.Then the display indicates all lights, the test mode is set. 1.Push the OFF button. 2.Return the “power select” switch (S700) to initially set posi- tion. MD SECTION MD section adjustments are done automatically in this

19、set. TUNER SECTION Note: Adjust the tuner section in the sequence shown below. 1.FM Auto Scan/Stop Level Adjustment. 2.FM Stereo Separation Adjustmnet. 3.AM (MW) Auto Scan/Stop Level Adjustment. 4.RDS S-Meter Adjustment. FM Auto Scan/Stop Level Adjustment Setting: SOURCE button: FM Procedure: 1.Set

20、to the test mode. 2.Push the SOURCE button and set to FM. Display 0 dB=1 V See the adjustment location from on page 20 for the ad- justment. Cautions during repair When the tuner unit is defective, replace it by a new one be- cause its internal block is difficult to repair. 3.Adjust with the volume

21、RV2 on TU1 so that the “FM” indica- tion turns to “FM0” indication on the display window. But, in case of already indicated “FM0”, turn the RV2 so that put out light “0” indication and adjustment. Display *1: MDX-C7900R is indicates “98.00”. Adjustment Location: See page 20. FM Stereo Separation Adj

22、ustment Setting: SOURCE button: FM Procedure: L-CH Stereo separation: A-B R-CH Stereo separation: C-D The separations of both channels should be equal. Specification: Separation more than 30 dB Adjustment Location: See page 20. FM RF signal generator Carrier frequency: 97.9 MHz (MDX-C7900) 98.0 MHz

23、(MDX-C7900R) Output level: 22 dB (12.6 V) Mode: mono Modulation: 1 kHz, 22.5 kHz deviation (30%) 0.01 F set antenna jack (J1) SHUF REG *1 SHUF REG *1 FM RF signal generator 0.01 F set antenna jack (J1) + speaker out terminal level meter 4 MDX-C7900MDX-C7900R Carrier frequency97.9 MHz98.0 MHz Output

24、level60 dB (1 mV)70 dB (3.2 mV) Modestereostereo main 1 kHz, 33.75 kHz1 kHz, 20 kHz deviation (45%)deviation (22.6%) Modulationsub 1 kHz, 33.75 kHz1 kHz, 20 kHz deviation (45%)deviation (22.6%) 19 kHz7.5 kHz7.5 kHz pilotdeviation (10%)deviation (10%) FM Stereo Level meterLevel meter signal generator

25、 connectionreading (dB) output channel L-CHL-CHA B R-CHL-CHAdjust RV4 on TU1 for minimum reading. R-CHR-CHC D L-CHR-CHAdjust RV4 on TU1 for minimum reading. RDS S-Meter Adjustment (MDX-C7900R) Setting: SOURCE button: FM Procedure: 1.Set to the test mode. (See page 18.) 2.Push the SOURCE button and s

26、et to FM. Display 3.Push the preset 10 button. 4.Adjust RV1 on MAIN board so that the display indication is “15.8”. Display Specification: Display indication : 15.6 to 16.4 Adjustment Location: See page 20. AM (MW) Auto Scan/Stop Level Adjustment Setting: SOURCE button (MDX-C7900): AM SOURCE button

27、(MDX-C7900R): MW Procedure: 1.Set to the test mode. (See page 18.) 2.Push the SOURCE button and set to FM. 3.Push the MODE button and set to AM (MDX-C7900) or MW (MDX-C7900R). Display 4.Adjust with the volume RV1 on TU1 so that the “AM” or “MW” indication turns to “AM0” or “MW0” indication on the di

28、s- play window. But, in case of already indicated “AM0” or “MW0”, turn the RV1 so that put out light “0” indication and adjustment. Display *2: MDX-C7900R is indicates “MW”. *3: MDX-C7900R is indicates “999”. Adjustment Location: See page 20. 19 20 AM RF signal generator Carrier frequency: 1000 kHz

29、(MDX-C7900) 999 kHz (MDX-C7900R) 30% amplitude modulation by 1 kHz signal Output level: 33 dB (44.7 V) set AM dummy antenna (50 ) 30 15 pF 65 pF antenna jack (J1) SHUF REG *3 *2 TP SHUF REG *3 *2 TP FM RF signal generator Carrier frequency: 98.0 MHz Output level: 35 dB (56.2 V) Mode: mono Modulation

30、: no modulation 0.01 F set antenna jack (J1) SHUF REG SHUF REG Adjustment Location: SET UPPER VIEW RV1 RDS S-METER Adjustment TU1 RV1 AM (MW) AUTO SCAN/STOP LEVEL Adjustment RV2 FM AUTO SCAN/STOP LEVEL Adjustment RV4 FM STEREO SEPARATION Adjustment MDX-C7900/C7900R 21 22 5-1.BLOCK DIAGRAM SERVO Sect

31、ion F CB DA E IJ J I B A C D E F DETECTOR 1 2 J I 4 5 6 7 A B C D 8 9 E F LDPD LASER DIODE ILCC PD OPTICAL PICK-UP (KMS-241A/J2N) AUTOMATIC POWER CONTROL Q302 11 10 APC PD LD/PD AMP 12 APCREF I-V AMP I-V AMP AT AMP B.P.F.2930 WBL ADFMADIN 32 ADFG ABCD AMP FOCUS ERROR AMP TRACKING ERROR AMP 35 34 26

32、28 ABCD FE TE SE V-I CONVERTER 20 F0CNT WBL 3T EQ +3.3V SERIAL/ PARALLEL CONVERTER, DECODER COMMAND 171618 SWDT SCLK XLAT RF AMP B.P.F. 46 RFO 40 RF AGC (OSC IN) 1.8 Vp-p 139 ns 5.6 Vp-p 272 ns 5 Vp-p 31 s 2.1 Vp-p 5.2 s 8 IC102 5 (OSCI) (FM MODE) 3.8 Vp-p 230 ns 55 5-11.IC PIN FUNCTION DESCRIPTION

33、SERVO BOARD IC301 CXD2652AR Pin No.Pin NameI/OFunction 1MNT0O Focus OK signal output to the MD mechanism controller (IC501) “H” is output when focus is on (“L”: NG) 2MNT1OTrack jump detection signal output to the MD mechanism controller (IC501) 3MNT2OMonitor 2 signal output to the MD mechanism contr

34、oller (IC501) 4MNT3OMonitor 3 signal output to the MD mechanism controller (IC501) 5SWDTIWriting serial data signal input from the MD mechanism controller (IC501) 6SCLKISerial data transfer clock signal input from the MD mechanism controller (IC501) 7XLATISerial data latch pulse signal input from th

35、e MD mechanism controller (IC501) 8SRDTO (3)Reading serial data signal output to the MD mechanism controller (IC501) 9SENSO (3)Internal status (SENSE) output to the MD mechanism controller (IC501) 10XRSTIReset signal input from the MD mechanism controller (IC501) “L”: reset 11SQSYO Subcode Q sync (S

36、COR) output to the MD mechanism controller (IC501) “L” is output every 13.3 msec Almost all, “H” is output 12DQSYO Digital In U-bit CD format subcode Q sync (SCOR) output terminal “L” is output every 13.3 msec Almost all, “H” is output Not used (open) 13RECPI Laser power selection signal input termi

37、nal “H”: recording mode, “L”: playback mode (fixed at “L” in this set) 14XINTOInterrupt status output to the MD mechanism controller (IC501) 15TXI Recording data output enable signal input terminal Writing data transmission timing input (Also serves as the magnetic head on/off output) Not used (fixe

38、d at “L”) 16OSCIISystem clock signal (512Fs=22.5792 MHz) input from the oscillator circuit 17OSCOOSystem clock signal (512Fs=22.5792 MHz) output terminal Not used (open) 18XTSLI Input terminal for the system clock frequency setting “L”: 45.1584 MHz, “H”: 22.5792 MHz (fixed at “H” in this set) 19RVDD

39、Power supply terminal (+3.3V) (digital system) 20RVSSGround terminal (digital system) 21DINIDigital audio signal input terminal when recording mode (for optical in) Not used (fixed at “L”) 22DOUTODigital audio signal output terminal when playback mode (for optical out) Not used (open) 23ADDTIRecordi

40、ng data input terminal Not used (fixed at “L”) 24DADTOPlayback data output terminal Not used (open) 25LRCKOL/R sampling clock signal (44.1 kHz) output terminal Not used (open) 26XBCKOBit clock signal (2.8224 MHz) output terminal Not used (open) 27FS256OClock signal (11.2896 MHz) output to the PCM171

41、7E (IC202) 28DVDDPower supply terminal (+3.3V) (digital system) 29A03O 30A02O 31A01O 32A00O 33A10O Address signal output to the external D-RAM Not used (open) 34A04O 35A05O 36A06O Address signal output to the D-RAM (IC307) 37A07O 38A08O 39A11O Address signal output to the external D-RAM Not used (op

42、en) (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER, 2M BIT D-RAM) Address signal output to the D-RAM (IC307) 56 Pin No.Pin NameI/OFunction 40DVSSGround terminal (digital system) 41XOEOOutput enable signal output to

43、the D-RAM (IC307) “L” active 42XCASOColumn address strobe signal output to the D-RAM (IC307) “L” active 43A09OAddress signal output to the external D-RAM Not used (open) 44XRASORow address strobe signal output to the D-RAM (IC307) “L” active 45XWEOWrite enable signal output to the D-RAM (IC307) “L”

44、active 46D1I/O 47D0I/O 48D2I/O 49D3I/O 50MVCIIDigital in PLL oscillation input from the external VCO Not used (fixed at “L”) 51ASYOOPlayback EFM full-swing output terminal 52ASYII (A)Playback EFM asymmetry comparator voltage input terminal 53AVDDPower supply terminal (+3.3V) (analog system) 54BIASI

45、(A)Playback EFM asymmetry circuit constant current input terminal 55RFII (A)Playback EFM RF signal input from the CXA2523R (IC302) 56AVSSGround terminal (analog system) 57PDOO (3)Phase comparison output for clock playback analog PLL of the playback EFM Not used (open) 58PCOO (3)Phase comparison output for master clock of the recording/playback EFM master PLL 59FILII (A)Filter input for master clock of the recording/playback master PLL 60FILOO (A)Filter output for master clock of the recording/playback master PLL 61CLTVI (A)Internal VCO control voltage input