SONY mdx_c7970 维修电路图.pdf

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1、MICROFILM SERVICE MANUAL Model Name Using Similar MechanismMDX-C7900/C7900R Base Mechanism TypeMG-164N-138 Optical Pick-Up NameKMS-241B/J1NP US Model Canadian Model E Model MDX-C7970 AEP Model UK Model MDX-C7970R SPECIFICATIONS MDX-C7970/C7970R Photo: MDX-C7970R FM/AM(MW/LW) MINIDISC PLAYER Continue

2、d on next page For RM-X4S (Remote Commander), please refer to RM-X4S Service Manual (9-925-698-) previously issued. 收音机爱好者资料库 Ra d i o Fa n s .CN 2 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 he

3、at. 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 3 times). Be careful not to apply force on the conductor when soldering or unsoldering. NOTES ON HANDLIN

4、G THE OPTICAL PICK-UP BLOCK OR BASE UNIT SAFETY-RELATED COMPONENT WARNING! 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 MA

5、NUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential

6、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 procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled wit

7、h care. NOTES ON LASER DIODE EMISSION CHECK Never look into the laser diode emission from right avove when checking it for adustment. It is feared that you will lose your sight. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (KMS-241B/J1NP) The laser diode in the optical pick-up block may suffer electr

8、o- static break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform m easures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care. laser-tap OPTICAL PICK-UP F

9、LEXIBLE BOARD ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS 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

10、 OU DANS LES SUPPLMENTS PUBLIS PAR SONY. 收音机爱好者资料库 Ra d i o Fa n s .CN 3 1.GENERAL Location of Controls .4 Resetting the Unit .5 Detaching the Front Panel.5 Preparing the Rotary Commander .5 Setting the Clock.5 Using the Rotary Commander .5 Adjusting the Sound Characterisitics .5 Attenuating the Sou

11、nd .5 Changing the Sound and Display Settings .6 Boosting the Bass Sound .6 Installation.7 Connections.8 2.DISASSEMBLY. 12 3.ELECTRICAL ADJUSTMENTS Test Mode . 18 MD Section . 18 Tuner Section . 18 4.DIAGRAMS 4-1.Block Diagram SERVO Section . 23 4-2.Block Diagram TUNER Section . 25 4-3.Block Diagram

12、 MAIN Section . 27 4-4.Block Diagram DISPLAY/KEY CONTROL Section . 29 4-5.Block Diagram BUS CONTROL/POWER SUPPLY Section . 31 4-6.Note for Printed Wiring Boards and Schematic Diagrams . 33 4-7.Printed Wiring Boards SERVO Section . 35 4-8.Schematic Diagram SERVO Board (1/3) . 37 4-9.Schematic Diagram

13、 SERVO Board (2/3) . 39 4-10. Schematic Diagram SERVO Board (3/3) . 41 4-11. Printed Wiring Board MAIN Board (Component Side) . 43 4-12. Printed Wiring Board MAIN Board (Conductor Side) . 45 4-13. Schematic Diagram MAIN Board (1/4) . 47 4-14. Schematic Diagram MAIN Board (2/4) . 49 4-15. Schematic D

14、iagram MAIN Board (3/4) . 51 4-16. Schematic Diagram MAIN Board (4/4) . 53 4-17. Printed Wiring Board DISPLAY Board . 55 4-18. Schematic Diagram DISPLAY Board . 57 4-19. Printed Wiring Board SUB Board . 59 4-20. Schematic Diagram SUB Board . 61 4-21. IC Pin Function Description . 69 5.EXPLODED VIEWS

15、. 79 6.ELECTRICAL PARTS LIST. 83 TABLE OF CONTENTS 收音机爱好者资料库 Ra d i o Fa n s .CN 4 SECTION 1 GENERAL This section is extracted from instruction manual. 5 6 7 8 9 10 11 12 SECTION 2 DISASSEMBLY SUB PANEL ASSY Note: Follow the disassembly procedure in the numerical order given. MECHANISM DECK (MG-164N

16、-138) 2 two claws 4 sub panel assy 1 three screws (PTT2.6 6) 3 connector (CN901) 2 claw 1 screw (PTT2.6 6) 1two screws (PTT2.6 4) 3mechanism deck (MG-164N-138) 2connector (CN200) 13 MAIN BOARD, HEAT SINK SERVO BOARD 2two screws (BVTT2 4) 1sensor flexible board (CN102) 2two screws (BVTT2 4) 1flexible

17、 board (CN103) 3servo board 4insulating sheet 3main board 2three screws (PTT2.6 6) (ground point) 1two screws (PTT2.6 10) 6heat sink 5eight screws (PTT2.6 10) 14 MD COVER ASSY FLOAT BLOCK 1four screws (B2 3) 3MD cover assy 2Pushing the Cassette Holder toward the direction A with a screwdriver, etc.,

18、 disengage the Shaft (MD Cover Guide) from the slot in the MD Cover Assy. Note:Take care not to scratch the Optiocal Pick-up when pushing the Cassette Holder with a screwdriver. etc. shaft (MD cover guide) cassette holder A 1tension spring (FL2) 1tension spring (FL2) 2two tension springs (FLOAT F) 3

19、Pushing an arrow A part, raise the float block up ward at the front to release a lock. A float block lever (lock R) lever (lock L) 15 LO MOTOR ASSY (LOADING) (M903) LEVER (LE) ASSY 4Remove the bracket (LO) in the direction of the arrow A. 1Remove solders of motor. (M903) 5LO motor assy (loading) (M9

20、03) 2tension spring (rack) 3claw A 2stopper washer 2lever (LE) assy 3roller (GLE) 1 16 HOLDER ASSY CHUCKING ARM ASSY 1Remove the chucking arm assy in the direction of the arrow. holder assy 2type-E stop ring 1.5 2type-E stop ring 1.5 3lever (lock L) 2type-E stop ring 1.5 2type-E stopring 1.5 4Remove

21、 the holder assy in the direction of the arrow. 1spring (CHKG) 1spring (CHKG) 3lever (lock R) 17 OPTICAL PICK-UP (KMS-241B/J1NP) SL MOTOR ASSY (SLED) (M902), SP MOTOR ASSY (SPINDLE) (M901) 6bearing (SL) 5feed screw assy 3screw (K2 3) 2shaft (SL2) 1two screws (K2 3) 7optical pick-up (KMS-241B/J1NP) 4

22、screw (B2 3) 4screw (P1.7 1.8) 5bracket (SL) 9two screws (P1.7 1.8) !retainer (SP) !SP motor assy (spindle) (M901) 7screw (B2 3) 2two screws (2 8) 3sensor board 1Remove solders of motors. (M901, M902) 8base (SL) 6SL motor assy (sled) (M902) 18 TEST MODE This set have the test mode function. In the t

23、est mode, FM Auto Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments can be performed easier than it in ordinary procedure. 1.Turn ON the regulated power supply. ( The clock is displayed) Note: Press theOFFbutton, if the clock is not displayed. 2.Push the preset 4 button. 3.Push the preset

24、5button. 4.Press the preset1button for more than two seconds. 5.Then the display indicates all lights, the test mode is set. 1.Push the OFF button. MD SECTION MD section adjustments are done automatically in this set. 3.Adjust the volume RV2 on TU1 by turning clockwise untill “0” is shown next to “F

25、M” on the display window, If “0” is already shown or the volume RV2 has been turned too far, turn it back counterclockwise untill “0” is disappeared once, then try this adjustment. Display SECTION 3 ELECTRICAL ADJUSTMENTS See the adjustment location from on page 22 for the ad- justment. TUNER SECTIO

26、N 0 dB=1 V Cautions during repair When the tuner unit is defective, replace it by a new one be- cause its internal block is difficult to repair. Note: Adjust the tuner section in the sequence shown below. 1.FM Auto Scan/Stop Level Adjustment 2.FM Stereo Separation Adjustment (MDX-C7970) 3.FM Stereo

27、Separation Adjustment (Wide) (MDX-C7970R) 4.FM Stereo Separation Adjustment (Narrow) (MDX-C7970R) 5.FM RDS S-Meter Adjustment (MDX-C7970R) 6.AM (MW) Auto Scan/Stop Level Adjustment FM Auto Scan/Stop Level Adjustment Setting: SOURCE button: FM FREQUENCY SELECT switch: FM 200 k (E model) Procedure: 1.

28、Set to the test mode. 2.Push the SOURCE button and set to FM. Display set antenna jack (CN1) FM RF signal generator Carrier frequency: 97.9 MHz (MDX-C7970) 98.0 MHz (MDX-C7970R) Output level: 22 dB (12.6 V) Mode: mono Modulation: 1 kHz, 22.5 kHz deviation (30%) 0.01 F SHUF *1 SHUF *1 *1: MDX-C7970R

29、indicates “98.00”. Adjustment Location: See page 22. 19 FM Stereo Level meterLevel meter signal generator connectionreading (dB) output channel L-CHL-CHA B L-CHR-CHAdjust RV3 on TU1 for minimum reading. R-CHR-CHC R-CHL-CHD FM Stereo Level meterLevel meter signal generator connectionreading (dB) outp

30、ut 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. FM Stereo Separation Adjustment (MDX-C7970) Setting: SOURCE button: FM FREQUENCY SELECT switch: FM 200 k (E model) Procedure: FM RF signal generator Carrier frequency : 97

31、.9 MHz Output level: 70 dB (3.2 mV) Mode: stereo Modulation: main: 1 kHz, 33.75 kHz deviation (45%) sub : 1 kHz, 33.75 kHz deviation (45%) : : 19 kHz pilot: 7.5 kHz deviation (10%) 0.01 F set antenna jack (J1) + LINE OUT jack (CNP300) level meter 10 k FM Stereo Separation Adjustment (Wide) (MDX-C797

32、0R) Setting: SOURCE button : FM SHIFT button: ON (light up SET UP and PLAY MODE) Preset 4(PLAY MODE) 5() buttons: WIDE mode FM RF signal generator Carrier frequency : 98.00 MHz Output level: 70 dB (3.2 mV) Mode: stereo Modulation: main: 1 kHz, 33.75 kHz deviation (45%) sub : 1 kHz, 33.75 kHz deviati

33、on (45%) : : 19 kHz pilot: 7.5 kHz deviation (10%) 0.01 F set antenna jack (J1) + level meter 10 k LINE OUT jack (CNP300) (75 ) Procedure: 1.Adjust the volume RV3 on FM/AM tuner unit (TU1) for the best separation. L-CH Stereo separation: A-B R-CH Stereo separation: C-D The separations of both channe

34、ls should be equal. Specification: Separation more than 24 dB Adjustment Location: See page 22. 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 22. 20 FM Stereo Level met

35、erLevel meter signal generator connectionreading (dB) output channel L-CHL-CHA B L-CHR-CHAdjust RV4 on TU1 for minimum reading. R-CHR-CHC R-CHL-CHD FM Stereo Separation Adjustment (Narrow) (MDX-C7970R) Setting: SOURCE button : FM SHIFT button: ON (light up SET UP and PLAY MODE) Preset 4(PLAY MODE) 5

36、() buttons: NARROW mode FM RF signal generator Carrier frequency : 98.00MHz Output level: 70 dB (3.2 mV) Mode: stereo Modulation: main: 1 kHz, 20 kHz deviation (26.7%) sub : 1 kHz, 20 kHz deviation (26.7%) : : 19 kHz pilot: 7.5 kHz deviation (10%) 0.01 F set antenna jack (J1) + level meter 10 k (75

37、) LINE OUT jack (CNP300) FM RDS S-Meter Adjustment (MDX-C7970R) Setting: SOURCE button : FM Procedure: 1.Set to the test mode. (See page 18) 2.Push the SOURCE button and set to FM. Display set antenna jack (J1) FM RF signal generator Carrier frequency: 98.00 MHz Output level: 35 dB (56.2 V) Mode: mo

38、no Modulation: no modulation 0.01 F SHUF SHUF Procedure: 1.Adjust the volume RV4 on FM/AM tuner unit (TU1) for the best separation. 3.Push the preset 10 button . 4.Adjust RV1 on MAIN board so that the display indication is “13.2”. Display Specification: Display indication: 13.0 to 13.4 Adjustment Lo

39、cation: See page 22. L-CH Stereo separation: A-B R-CH Stereo separation: C-D The separations of both channels should be equal. Specification: Separation more than 18 dB Adjustment Location: See page 22. 21 22 MW Auto Scan/Stop Level Adjustment Setting: SOURCE n MODE button : AM (MDX-C7970) MW (MDX-C

40、7970R) FREQUENCY SELECT switch : AM 10 k (E model) 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 or MW. Display 4.Adjust with the volume RV1 on TU1 so that the “AM” or “MW” indication turns to “AM0” or “MW0” indication o

41、n the dis- play window. But, in case of alredy indicated “AM0” or “MW0”, turn the RV1 so that put out light “0” indication and adjustment. Display *2: MDX-C7970R indicates “MW”. *3: MDX-C7970R indicates “999”. *4: Only MDX-C7970R indicates. Adjustment Location: See page 22. AM RF signal generator Ca

42、rrier frequency : 1000 kHz (MDX-C7970) 999 kHz (MDX-C7970R) 30% amplitude modulation by 1 kHz signal Output level: 33 dB (44.7 V) (50 ) set AM dummy antenna 30 15 pF 65 pF antenna jack (J1) SHUF TP *3 *2 *4 SHUF TP *3 *2 *4 Adjustment Location: SET UPPER VIEW RV1 RDS S-Meter Adjustment (MDX-C7970R)

43、TU1 RV1 AM (MW) Auto Scan/Stop Level Adjustment RV2 FM Auto Scan/Stop Level Adjustment FM Stereo Separation Adjustment (MDX-C7970) FM Stereo Separation Adjustment (Narrow) (MDX-C7970R) RV3 FM Stereo Separation Adjustment (Wide) (MDX-C7970R) RV4 MDX-C7970/C7970R 23 24 SECTION 4 DIAGRAMS 4-1.BLOCK DIA

44、GRAM SERVO Section 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-241B/J1NP) 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 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 & EQ AGCI EQ 38 RF RF AMP, FOCUS/TRACKING ERROR AMP IC302 TEM