JVC-UXG5-cs-sm 电路图 维修手册.pdf

《JVC-UXG5-cs-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《JVC-UXG5-cs-sm 电路图 维修手册.pdf（49页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB431 2005/8 MICRO COMPONENT SYSTEM MB43120058 UX-G5 Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 CA-UXG5SP-UXG5SP-UXG5 Area suffix A - Australia US - Singapore UP - Korea UT - Taiwan UW - Brazil,Mexico,Peru UY - Argentina UJ - U.S.Military RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB431) SPECIFICATION Desig

5、n and specifications are subject to change without notice. Amplifier sectionOutput Power100 W (50 W+50 W) at 6 (10% THD) Speakers Impedance6 - 16 Audio Input AUX400 mV/50 k Tuner sectionFM tuning range87.50 MHz - 108.00 MHz AM tuning range531 kHz - 1 710 kHz (at 9 kHz) 530 kHz - 1 710 kHz (at 10 kHz

6、) CD player sectionDynamic range85 dB Signal-to-noise ratio85 dB Wow and flutterImmeasurable Cassette deck section Frequency response: Normal (type l) 60 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 110 V - 127 V / 220 V - 240 V (adjustable with the voltage selector), 50 Hz/

7、60 Hz Power consumption90 W (at operation) 0.8 W (on standby) Dimensions (approx.)175 mm 232 mm 412 mm (W/H/D) Mass (approx.)6.6 kg SpeakersType2-way Bass reflex Speaker unitsWoofer10 cm cone 1 Tweeter4 cm cone 1 Impedance6 Dimensions (approx.)144 mm 231 mm 201 mm (W/H/D) Mass (approx.)2.0 kg each R

8、adioFans.CN 收音机爱 好者资料库 (No.MB431)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and components specially for safety purpos- es. For continued protection, no changes should be made to the original design unless authorized in

9、writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be per- formed by qualified personnel only. (2) Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made.

10、 Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These

11、 characteris- tics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts Li

12、st of Ser- vice Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety charac- teristics as the recommended replacement parts shown in t

13、he Parts List of Service Manual may create shock, fire, or other hazards. (4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric sho

14、ck and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after reassem- bling. (5) Leakage shock hazard testing After reassembling the product, always perform an isola- tion check on the e

15、xposed metal parts of the product (an- tenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check. Plug the AC line cord directly into

16、 the AC outlet. Using a Leakage Current Tester, measure the leakage current from each exposed metal parts of the cabinet, particular- ly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check

17、method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an ex- posed metal part and a known good earth ground. Measure the AC voltage

18、 across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage me

19、asured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1.2Warning (1) This equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (3)

20、 Repairs must be made in accordance with the relevant safety standards. (4) It is essential that safety critical components are replaced by approved parts. (5) If mains voltage selector is provided, check setting for local voltage. 1.3Caution Burrs formed during molding may be left over on some part

21、s of the chassis. Therefore, pay attention to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the r

22、esistor ( ), diode ( ) and ICP ( ) or identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version) Good earth ground Place this probe on each ex

23、posed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB431) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB431)1-5 SECTION 3 DISASSEMBLY 3.1Disassembly

24、of Right plate left plate Top cover Replacement of the fuses and AMP TR .THMS RES. Transistor. 7808 IC. 3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure, remover right plate, left plate, top cover. (1) Replace the fuses inside. Caution: Be sure to use fuses with the s

25、pecified Fig.1 3.1.2Replacing the AMP TR (See Fig.2) Prior to performing the following procedure, remove the right plate, left plate, top cover. (1) Remove the four screws A from the heat sink between AMP TR four. (2) Remove the solder fixing the AMP TR. 3.1.3Replacing the THMS RES (See Fig.2) Prior

26、 to performing the following procedure, remove right plate, left plate, top cover. (1) Remove the one screw B from heat sink. (2) Remove the solder fixing THMS RES. Fig.2 3.1.4Replacing the 7808 IC (See Fig.3) (1) Remove the two screws D from heat sink. (2) Remove the solder fixing transistor. Fig.3

27、 FUSE A B (TR) THMS RES D 1-6 (No.MB431) 3.1.5Removing the transformer cover (See Fig.4) (1) Remove the ten screws E from top cover. (2) Take off transformer cover from rear plate. Fig.4 3.1.6Removing the Right plate (See Fig.5) (1) Remove the two screws F. (2) Take off right plate from main body. F

28、ig.5 3.1.7Removing the Left plate (See Fig.6) (1) Remove the two screws G. (2) Take off left plate from main body. Fig.6 SPEAKERS IMPEDANCE:6 16 EE Transformer cover E E F Right plate G Left plate (No.MB431)1-7 3.1.8Removing the TOP COVER (See Fig.7 to 9) (1) Remove the two screws H1 (See Fig.7, 8).

29、 (2) Disengage the claws H2 on both side of the front cabinet (See Fig.7, 8). (3) Rotate top cover and lets away from main body (See Fig.9). Caution: When you rotate top cover, must to slow raise, Dont to destroy the two claws of front cabinet. Fig.7 Fig.8 Fig.9 H1 Top cover H2 H1H2 1-8 (No.MB431) 3

30、.1.9Removing the main board (See Fig.10 to 13) (1) Remove the two screws J1. (See Fig.10) (2) Disconnect the FFC cable J2 from the connector CN661 on main board. (See Fig.10) (3) Disconnect the FFC cable J3 from the connector CN402 on main board. (See Fig.11) (4) Disconnect the FFC cable J4 from the

31、 connector CN681 on main board. (See Fig.12) (5) Remove main board from AMP board after disconnect the connector J319 and CN601. (See Fig.13) Fig.10 Fig.11 Fig.12 Fig.13 J1J1J2 J3 J4 J5 (No.MB431)1-9 3.1.10 Removing the Power board (See Fig.14 to 16) (1) Remove the two screws K1 from CD MECH cover a

32、nd power board. (See Fig.14) (2) Remove the two screws K1 from rear plate and power board. (See Fig.14-1) (3) Disconnect the wire K2 from the connector CN102 on the AMP board. (See Fig.15) (4) Disconnect the two wire K3 from the connector CN901 and CN902. (See Fig.16) Fig.14 Fig.14-1 Fig.15 Fig.16 P

33、ower board K1 k1 K2 K3 1-10 (No.MB431) 3.1.11 Removing the Rear plate assembly (See Fig.17 to 18) (1) Disengage the claws I1 on both sides of bottom plate. (See Fig.17) (2) Disconnect the wire I2 from the connector CN105 on the AMP board. (See Fig.18) Fig.17 Fig.18 3.1.12 Removing the fan (See Fig.1

34、9) (1) Removing the four screws M2. 3.1.13 Removing the Tuner pack (See Fig.19) (1) Removing the two screws M1. Fig.19 I1 Rear plate assembly I2 M1 M2 M2Fan M2 M2 M1 Tuner pack (No.MB431)1-11 3.1.14 Removing the cassette machine from top cover (See Fig.20 to 22) (1) Disconnect the wire E1 from conne

35、ctor of the cassette ma- chine. (See Fig.20) (2) Disconnect the wire E2 from connector of the cassette ma- chine. (See Fig.21) (3) Remove the four screws E3 from top cover. (See Fig.22) (4) Take out cassette machine. Fig.20 Fig.21 Fig.22 TOP COVER E1 E2 TOP COVER CASSETTE MECHA E3E3 E3E3 TOP COVER C

36、ASSETTE MECHA 1-12 (No.MB431) 3.1.15 Removing the key board (See Fig.23) (1) Remove the eight screws P from the front cabinet and the key board. Fig.23 3.1.16 Removing the AUX board (See Fig.24) (1) Remove the two screws Q from the front cabinet and the aux board. 3.1.17 Removing the phones board (S

37、ee Fig.24) (1) Remove the two screws R from the front cabinet and the phones board. Fig.24 Key board P P P Aux board Phones board QR (No.MB431)1-13 3.1.18 Removing the CD MECH COVER (See Fig.25, 26) (1) Remove the four screws S. Fig.25 Fig.26 CD Mech Cover S S 1-14 (No.MB431) 3.1.19 Removing the CD

38、MECH Assembly (See Fig.27, 28) (1) Remove the two screws T from the CD MECH-F and CD MECHANISM assembly. (See Fig.27) (2) Remove the two screws T from the CD MECH-B and CD MECHANISM assembly. (See Fig.28) (3) Take out CD MECHANISM assembly from the CD MECH- F between the CD MECH-B. Fig.27 Fig.28 CD

39、MECH Assembly T TT (No.MB431)1-15 SECTION 4 ADJUSTMENT 4.1Measuring instructions required for adjustment AM signal generator FM signal generator Inter medicate frequency sweep generator FM stereo signal generator Low-frequensy oscillator (osillation frequency 50 Hz - 20 kHz, 0 dB output with 600 imp

40、edance) Attenuator (600 impedance) Electoronic voltmeter Distortion meter Torque gauge (cassette for CTG-N) Wow & flutter meter Frequency counter meter 4.2Test tape Playback tape VT712 (tape speed, wow flutter) VT724 (reference level) VT703L (head azimuth) VT738 (frequency responce) Recording tape A

41、C225 (type I) Power supply voltage AC220V - 240V 50Hz 4.3Measuring instruments Radio section FM : 1 kHz, 22.5kHz deviation FM stereo : 1 kHz, 67.5 kHz deviation, pilot signal 7.5 kHz AM : 1 kHz, 30% modulation Reference output : 0 dB (1 V) 4 Headphone output : -10 dB (0.1V) 32 4.4Amplifier section R

42、eference output : Speaker output 0 dB (1 V) / 4 Headphone output -10 dB (0.1 V) / 32 4.5CD section Test disc : CTS-1000 (JVC) TCD-731R (A-BEX) TCD-712R (A-BEX) TCD-785 (A-BEX) 1-16 (No.MB431) 4.6Cassette amplifier section 4.7Tuner section ItemMeasuring conditionCheck and adjustment procedureStandard

43、 valueAdjusting part Head azimuth adjustment Tape speed and wow/flutter check and adjustment PB frequency responce check Bias frequency check REC and PB frequency responce adjustment Head azimuth adjusting screw (to be used only after head re- placement) Tape speed : motor semifixed resistor check o

44、nly L203 Output level : within +/-2dB of maximum output level 2940 to 3090 Hz within 0.38% (unweighted) deviation between 1 kHz and 8 kHz : 0 (+3 to -6) dB. Level difference between REC and PB : within 0 (+3 to 6) dB Phase defference L and R channels: minimum 1.Plyback the test tape VT703. 2.Adjust

45、the head azimuth adjusting screw so that the phase difference between the R and L channels is minimized at an output level that is within +/- 2dB of the maximum output level. After this adjustment, lock the head azimuth adjusting screw with screw sealant to cover more than a half of the screw head.

46、3.When the head azimuth is maladjusted, correct it with the head azimuth adjusting screw. 1.Plyback the test tape VT712 by the end of position. 2.Connect a frequency counter and check that it reads between 2940 and 3090 Hz. If not, adjust the frequenct with the motor semifixed resistor. 3.Check that

47、 the wow / flutter is 0.38% (unweighted). Playback the test tape VT738 while confir- ming that deviation between the 1 kHz signal and 8 kHz signal should be 0 (+3 to -6) dB. Set the TUNER or CD function and with TAPE to record. Check to see if the frequency at the measuring point (R335 or R336) is 6

48、0 kHz +/-1 kHz if not adjust T360 until the frequency counter indicates 60 kHz +/- 1 kHz. At TUNER, set the BAND to the FM position, and record the reference 1 kHz signal and 8 kHz signal altemately repeatedly. While playing back the recorded signal differ from that of the 1 kHz signal by within 0 (

49、+3 to 6) dB. Test tape : VT703 Signal output terminal : PHONES (with 32 ohm load) Test tape : VT712 Signal output terminal : PHONES (with 32 ohm load) Test tape : VT738 Signal output terminal : PHONES (with 32 ohm load) Test tape : normal Signal output terminal : Casssette R/P head Test tape : AC225 Signal input : FM 22.5 dev, 60dBu with emphasis Signal output te