Jvc-KSFX-490-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. No.49845 2003/5 CASSETTE RECEIVER 4984520035 KS-FX490 TABLE OF CONTENTS 1Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2

2、Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . 19 4Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 S Area Suffix J - Northern America RadioFans.CN 收音机爱 好者资料库 1-2 (No.49845) SPECIFICATION Design and specifications are s

4、ubject to change without notice. AUDIO AMPLIFIER SECTION Maximum Power OutputFront50 W per channel Rear50 W per channel Continuous Power Output (RMS) Front19 W per channel into 4 , 40 Hz to 20 000 Hz at no more than 0.8 % total harmonic distortion. Rear19 W per channel into 4 , 40 Hz to 20 000 Hz at

5、 no more than 0.8 % total harmonic distortion. Load Impedance4 (4 to 8 allowance) Tone Control RangeBass10 dB at 100 Hz Treble9 dB at 10 kHz Frequency Response40 Hz to 20 000 Hz Signal-to-Noise Ratio70 dB Line-Out Level/Impedance2.0 V/20 k load (250 nWb/m) TUNER SECTIONFrequency RangeFM87.5 MHz to 1

6、07.9 MHz AM530 kHz to 1 710 kHz FM Tuner Usable Sensitivity11.3 dBf (1.0 V/75 ) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivity (400 kHz)65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation35 dB Capture Ratio1.5 dB AM Tuner Sensitivity20 V Selectivity35 dB CASSET

7、TE DECK SECTION Wow & Flutter0.11% (WRMS) Fast-Wind Time100 sec. (C-60) Frequency Response (Dolby B NR OFF)30 Hz to 16 000 Hz (Normal tape) Signal-to-Noise Ratio (Normal tape) (Dolby B NR ON)65 dB (Dolby B NR OFF) 56 dB Stereo Separation40 dB GENERALPower RequirementOperating Voltage DC 14.4 V (11 V

8、 to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C (32F to +104F) Dimensions (W H D)Installation Size182 mm x 52 mm x 150 mm (7-3/16 x 2-1/16 x 5-15/16) Panel Size188 mm x 58 mm x 12 mm (7-7/16 x 2-5/16 x 1/2) Mass1.3 kg (2.9 lbs) (excluding accessories) Ra

9、dioFans.CN 收音机爱 好者资料库 (No.49845)1-3 SECTION 1 Precautions 1.1Safety Precautions ! Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. RadioFans.CN 收音机爱 好者资料库 1-4 (No.49845) SECTION 2 Disass

10、embly method 2.1 Main body 2.1.1 Removing the front panel assembly (See Fig.1) (1) Push the detach button in the lower left part of the front panel assembly and remove the front panel assembly in the direction of the arrow. Fig.1 2.1.2Removing the bottom cover (See Fig.2) Prior to performing the fol

11、lowing procedures, remove the front panel assembly. (1) Turn the main body upside down. (2) Insert a screwdriver under the joints to release the two joints a on the left side, two joints b on the right side and joint c on the back side of the main body, then remove the bottom cover from the main bod

12、y. CAUTION: When releasing the joints using a screwdriver, do not damage the main board. Fig.2 2.1.3Removing the front chassis assembly (See Figs.3 and 4) Prior to performing the following procedures, remove the front panel assembly and bottom cover. (1) Remove the two screws A on the both sides of

13、the main body. (See Fig.3.) (2) Remove the two screws B on the front side of the main body. (See Fig.4.) (1) Release the two joints d and two joints e on the both sides of the main body, then remove the front chassis assembly toward the front. (See Fig.3.) Fig.3 Fig.4 Front panel assembly Detach but

14、ton Bottom cover Joint a Joint b Joint a Joint b Joint c Joint d Joint d Front chassis assembly A Joint e Joint e A B Front chassis assembly (No.49845)1-5 2.1.4 Removing the heat sink (See Fig.5) Prior to performing the following procedure, remove the front panel assembly. (1) Remove the two screws

15、C and screw D attaching the heat sink on the left side of the main body, and remove the heat sink. Fig.5 2.1.5Removing the rear panel (See Fig.6) Prior to performing the following procedure, remove the front panel assembly and bottom cover. (1) Remove the two screws E, three screws F and three screw

16、s G attaching the rear panel on the back side of the main body. Fig.6 2.1.6Removing the main board (See Fig.7) Prior to performing the following procedures, remove the front panel assembly, bottom cover, front chassis assembly, heat sink and rear panel. (1) Remove the two screws H attaching the main

17、 board on the top chassis. (2) Disconnect the connector CP401 on the main board from the cassette mechanism assembly. Fig.7 C D Heat sink C FG EEF Rear bracket H Main board CP401 H 1-6 (No.49845) 2.1.7Removing the cassette mechanism assembly (See Fig.8) Prior to performing the following procedures,

18、remove the front panel assembly, bottom cover, front chassis assembly, heat sink, rear panel and main board. (1) Disconnect the wire from the connector CN402 on the mecha board. (2) Disconnect the card wire from the connector CN403 on the mecha board. (3) Remove the four screws J attaching the casse

19、tte mecha- nism assembly to the top chassis, take out the cassette mechanism assembly. Fig.8 2.1.8Removing the mecha board (See Fig.9) Prior to performing the following procedures, remove the front panel assembly, bottom cover, front chassis assembly, heat sink, rear panel and main board. (1) Discon

20、nect the wire from the connector CN402 on the mecha board. (2) Disconnect the card wire from the connector CN403 on the mecha board. (3) Remove the screw K attaching the mecha board. (4) Bend the hook f in the direction of the arrow 1 and move the mecha board in the direction of the arrow 2. (5) Rem

21、ove the mecha board from the mecha bracket (L) of the top chassis.Fig.9 JJ Top chassis Cassette mechanism assembly CN403CN402 Mecha board K Mecha board Hook f Top chassis Mecha bracket (L) CN402 CN403 1 2 (No.49845)1-7 2.1.9 Removing the front board (See Figs.10 to 12) Prior to performing the follow

22、ing procedures, remove the front panel assembly. (1) Remove the four screws L attaching the rear cover on the back side of the front panel assembly. (See Fig.10.) (2) Release the nine joints g, the front panel assembly and rear cover become separate. (See Fig.11.) (3) Remove the front board from the

23、 front panel assembly. (See Fig.12.) Fig.10 Fig.11 Fig.12 L LL Rear cover Joints g Joints g Joint g Joint g Rear cover Front panel assembly Front boardFront panel assembly 1-8 (No.49845) 2.2Cassette mechanism assembly REFERENCE: Prior to performing the following procedures, turn the mode gear on the

24、 bottom of the body until the respective part comes to the EJECT position (Refer to Fig.1). Fig.1 2.2.1Removing the cassette guide (See Fig.2) (1) Turn the mode gear to set to RVS play or subsequent mode. (2) Remove the cassette guide from the main chassis while re- leasing each two joint tabs a in

25、the direction of the arrow. Fig.2 2.2.2Removing the load arm (See Fig.3) (1) Remove the E-washer attaching the load arm. (2) Move the load arm in the direction of the arrow and release the joint b on the cassette catch. Fig.3 Mode gear Cassette guide Tab a Tab a Load arm E-washer Joint b (No.49845)1

26、-9 2.2.3Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7) (1) Check the mode is set to EJECT. Push down the front part of the cassette holder and move in the direction of the ar- row to release the joint c. (2) Move the rear part of the cassette hanger assembly in the directio

27、n of the arrow to release it from the two joint bosses d. (3) Release the holder stabilizer spring from the hooks e and f, then pull out from the cassette hanger assembly. (4) Bring up the rear side of the cassette hanger assembly to release the joint g and h. (5) Pull out the cassette catch from th

28、e cassette hanger as- sembly. Fig.4 Fig.5 Fig.6 Fig.7 Cassette holder assembly Side bracket Joints c Cassette holder assembly Cassette hanger assembly Boss d Boss d Cassette hanger assembly Cassette stabilizer spring Hook f Hook e Cassette hanger assembly Hook h Hook g Cassette holder assembly Casse

29、tte holder assembly Cassette hanger assembly Cassette catch 1-10 (No.49845) 2.2.4Removing the side bracket assembly (See Fig.8 to 10) (1) Remove the screw A attaching the side bracket assembly. (2) Detach the front side of the side bracket assembly upward and pull out forward to release the joint i

30、and j in the rear. CAUTION: When reassembling, make sure that the boss k of the main chassis is set in the notch of the load rack under the side bracket assembly. Do not reattach the load rack on the boss k. CAUTION: After reattaching the side bracket assembly, confirm op- eration. Fig.8 Fig.9 Fig.1

31、0 A Side bracket assembly Side bracket assembly Joint i Joint j Joint i Joint j Side bracket assembly Boss k Load rack Boss k Load rack (No.49845)1-11 2.2.5Removing the pinch arm (F) assembly (See Fig.11 and 12) (1) Remove the polywasher and pull out the pinch arm (F) as- sembly. (2) Remove the comp

32、ulsion spring. 2.2.6Removing the pinch arm (R) assembly (See Fig.11 and 12) (1) Remove the polywasher and pull out the pinch arm (R) as- sembly. 2.2.7Removing the slide chassis assembly (See Fig.13 and 14) REFERENCE: It is not necessary to remove the head and the tape guide. (1) Move the slide chass

33、is assembly in the direction of the ar- row to release the two joints l and remove from the main chassis. (2) Remove the rack link. CAUTION: When reassembling, first reattach the rack link, and next fit the boss m and hook n of the slide chassis assembly to the hole of the main chassis, and engage t

34、he two joints l. Fig.11 Fig.12 Fig.13 Fig.14 Polywasher Polywasher Pinch arm (F) assembly Pinch arm (R) assembly Polywasher Pinch arm (F) assembly Compulsion spring Pinch arm (R) assembly Polywasher Slide chassis assembly Joint l Joint l Boss m Hook n Rack link Head Tape guide 1-12 (No.49845) 2.2.8

35、Removing the head / tape guide (See Fig.16 and 17) REFERENCE: It is not necessary to remove the slide chassis assembly. (1) Remove the band attaching the wire to the head. (2) Remove the two screws B, the head and the head support spring. (3) Remove the pinch arm spring from the tape guide. (4) Remo

36、ve the tape guide and the pinch spring arm. CAUTION: When reattaching the pinch arm spring, set both end of it to the pinch spring arm (remarked o). CAUTION: When reattaching the head, set the wires into the groove of the tape guide (Fig.16). 2.2.9Removing the flywheel assembly (F) & (R) (See Fig.18

37、 and 19) REFERENCE: It is not necessary to remove the slide chassis assembly. (1) Remove the belt at the bottom. (2) Remove the two polywashers on the upper side. (3) Pull out each flywheel assembly downward. Fig.15 Fig.16 Fig.17 Fig.18 B Slide chassis assembly Head Tape guide B Pinch arm spring Hea

38、d Head support spring Tape guide Pinch spring arm Slid chassis assembly o o Flywheel assembly (F) Flywheel assembly (R) Belt Polywasher Polywasher Flywheel assembly (F) Flywheel assembly (R) (No.49845)1-13 2.2.10 Disassembling the flywheel assembly (F) (See Fig.19 and 20) (1) Push and turn countercl

39、ockwise the spring holder (F) to re- lease the three joints p on the bottom of the flywheel. (2) The spring holder (F), the TU spring and the friction gear play come off. (3) Remove the polywasher and felt. 2.2.11 Disassembling the flywheel assembly (R) (See Fig.19 and 20) (1) Push and turn clockwis

40、e the spring holder (R) to release the three joints q on the bottom of the flywheel. (2) The spring holder (R), the FF spring and the friction gear FF come off. (3) Remove the polywasher and the felt. 2.2.12 Removing the reel board (See Fig.21 and 22) (1) Remove the two screws C attaching the reel b

41、oard. (2) Move the reel board in the direction of the arrow to release the joint r. (3) Unsolder the wires if necessary. CAUTION: When reattaching, confirm operation of the MODE switch and the ST-BY switch. The mode position between EJECT and ST-BY is opti- mum for reattaching. Connect the card wire

42、 extending from the reel board to the FFC pad before reattaching the reel board. Fig.19 Fig.20 Fig.21 Fig.22 Flywheel assembly (F) Flywheel assembly (R) Joints p Joint p Joints q Joint q Polywasher Spring holder (F) TU spring Polywasher Spring holder (R) FF spring Friction gear play Friction gear FF

43、 Flywheel assembly (F) Flywheel assembly (R) Felt Felt FFC pad Joint r Reel board C C FFC pad CT-1 switch ST-BY switch Soldering MODE switch 1-14 (No.49845) 2.2.13 Removing the gear base arm / gear base link assembly (See Fig.23 to 25) (1) Move the gear base arm in the direction of the arrow. (2) In

44、sert a slotted screwdriver to the gear base spring under the gear base arm, and release the gear base arm upward from the boss on the gear base assembly. (3) Remove the gear base arm from the main chassis while re- leasing the two joints s. (4) Move the gear base link assemby in the direction of the

45、 ar- row to release the two joints t. REFERENCE: When reattaching the gear base arm, make sure that the boss on the gear base assembly is inside the gear base spring. 2.2.14 Removing the FFC pad (See Fig.25 and 27) (1) Push each joint hook u of the FFC pad and remove toward the bottom. Fig.23 Fig.24

46、 Fig.25 Gear base link assembly Gear base arm FFC pad Joint t Joint t Joints s Hook u Hook u Gear base arm Screwdriver Gear base spring FFC pad Gear base link assembly Gear base arm (No.49845)1-15 2.2.15 Removing the mode gear (See Fig.26 and 29) (1) Remove the polywasher on the bottom and pull out

47、the mode gear. 2.2.16 Removing the mode switch actuator (See Fig.26, 27 and 29) (1) Pull out the mode switch actuator at the bottom. REFERENCE: When reattaching the mode switch actuator to the main chassis, make sure to set on the shaft and insert v into the slot w. 2.2.17 Removing the direction lin

48、k / direction plate (See Fig.27 to 29) (1) Remove the polywasher attaching the direction link. (2) Bring up the direction link to release the three joints x, y and z at a time. (3) Move the direction plate in the direction of the arrow to re- lease the two joints a. REFERENCE: When reattaching the d

49、irection plate, engage the two joints a and move in the direction of the arrow (Refer to Fig.28). REFERENCE: When reattaching the direction link, move the direction plate in the direction of the arrow and engage the three joint x, y and z at a time (Refer to Fig.29). 2.2.18 Removing the mode rack assembly (See Fig.27 and 28) (1) Move the mode rack assembly in the direction of the arrow to release the two joints b and the joint c. REFERENCE: When reattaching, set the two b on the bottom of the mode rack assembly into the slots of the main chassis and move in th