Jvc-KSFX-621-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.49825 2003/03 KS-FX621 CASSETTE RECEIVER 49825200303 KS-FX621 TABLE OF CONTENTS 1Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、1-2 2Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 3Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . 1-17 4Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 MODESCM 11 RPT12 RND10978 MO Area Suffix U - Other Areas RadioFans.CN 收音机爱 好者资料库 KS-FX621 1-2 (No.49825) SECTION 1 Safet

4、y precaution CAUTION 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 KS-FX621 (No.49825)1-3 SECTION 2 Disassembly method 2.1 Main body 2.1.1Removing the front pa

5、nel assembly (See Fig.1) (1) Press the release button and remove the front panel as- sembly. Fig.1 2.1.2Removing the bottom cover (See Fig.2) Prior to performing the following procedure, remove the front panel assembly. (1) Turn the body upside down. (2) Insert a screwdriver under the joints to rele

6、ase the two joints a on the left side, the two joints b on the right side and the joint c on the back of the body, then remove the bottom cover from the body. CAUTION: When releasing the joint c using a screwdriver, do not damage the main board. Fig.2 2.1.3Removing the front chassis (See Fig.3) Prio

7、r to performing the following procedure, remove the front panel assembly and bottom cover. (1) Remove the screw A on each side of the body. (2) Release the two joints d and the two joints e on the sides, then remove the front chassis toward the front. Fig.3 Front panel assembly Release button Bottom

8、 cover Joint b Joint b Joint a Joint c Joint a Joint dJoint e Front chassis Joint d A Joint e RadioFans.CN 收音机爱 好者资料库 KS-FX621 1-4 (No.49825) 2.1.4Removing the heat sink (See Fig.4) Prior to performing the following procedure, remove the front panel assembly. (1) Remove the two screws B and two scre

9、ws C attaching the heat sink on the left side of the body, and remove the heat sink. Fig.4 2.1.5Removing the rear panel (See Fig.5) Prior to performing the following procedure, remove the front panel assembly and bottom cover. (1) Remove the two screws D, three screws E and three screws F attaching

10、the rear panel on the back of the body. Fig.5 2.1.6Removing the main board (See Fig.6) Prior to performing the following procedure, remove the front panel assembly, bottom cover, front chassis, heat sink and rear panel. (1) Remove the two screws G attaching the main board on the top chassis. (2) Dis

11、connect the connectors CP701 on the main board from the cassette mechanism assembly. Fig.6 Heat sink CBC E D EFFD Rear panel G Main board assembly CP701 G KS-FX621 (No.49825)1-5 2.1.7Removing the cassette mechanism assembly (See Fig.7) Prior to performing the following procedure, remove the front pa

12、nel assembly, bottom cover, front chassis, heat sink, rear panel and main board. (1) Remove the four screws H attaching the cassette mecha- nism assembly from the top chassis. Fig.7 2.1.8Removing the mecha board (See Fig.8) Prior to performing the following procedure, remove the front panel assembly

13、, bottom cover, front chassis, heat sink, rear panel, main board and cassette mechanism assembly. (1) Disconnect the wire from the connectors CN402 and CN403 on the mecha board. (2) Remove the screw J attaching the mecha board. Fig.8 2.1.9Removing the front board (See Figs.9 to 11) Prior to performi

14、ng the following procedure, remove the front panel assembly. (1) Remove the four screws L attaching the rear cover on the back of the front panel assembly. (See fig.9) (2) Release the eleven joints f, the front panel and the rear cover become separate. (See fig.10) (3) Remove the front board from th

15、e front panel assembly. (See fig.11) Fig.9 Fig.10 Fig.11 H H HH Top chassis Cassette mechanism assembly J CN402 CN401CN403 K KK K Joint h Joint h Joint h Joint h Front panel assembly Rear cover LCD & Key control board KS-FX621 1-6 (No.49825) 2.2 CD Mechanism Assembly REFERENCE: Prior to performing t

16、he following procedures, turn the mode gear on the 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 c

17、hassis while re- leasing each two joint tabs a in 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

18、 Tab a Tab a Load arm E-washer Joint b KS-FX621 (No.49825)1-7 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 th

19、e rear part of the cassette hanger assembly in the direction 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

20、 the joint g and h. (5) Pull out the cassette catch from the 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 h

21、anger assembly Hook h Hook g Cassette holder assembly Cassette holder assembly Cassette hanger assembly Cassette catch KS-FX621 1-8 (No.49825) 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 b

22、racket assembly upward and pull out forward to release the joint i 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 reattachin

23、g the side bracket assembly, confirm opera- tion. Fig.8 Fig.9 Fig.10 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 KS-FX621 (No.49825)1-9 2.2.5Removing the pinch arm (F) assembly (See Fig.11 and 12) (1) Remove th

24、e polywasher and pull out the pinch arm (F) as- sembly. (2) Remove the compulsion spring. Fig.11 Fig.12 2.2.6Removing the pinch arm (R) assembly (See Fig.11 and 13) (1) Remove the polywasher and pull out the pinch arm (R) as- sembly. Fig.13 Fig.14 2.2.7Removing the slide chassis assembly (See Fig.14

25、 and 15) REFERENCE: It is not necessary to remove the head and the tape guide. (1) Move the slide chassis 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 nex

26、t fit the boss m and hook n of the slide chassis assembly to the hole of the main chassis, and engage the two joints l. Fig.15 Polywasher Polywasher Pinch arm (F) assembly Pinch arm (R) assembly Polywasher Pinch arm (F) assembly Compulsion spring Pinch arm (R) assembly Polywasher Slide chassis assem

27、bly Joint l Joint l Boss m Hook n Rack link Head Tape guide KS-FX621 1-10 (No.49825) 2.2.8Removing 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

28、and the head support spring. (3) Remove the pinch arm spring from the tape guide. (4) Remove 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 g

29、roove of the tape guide (Fig.16). Fig.16 Fig.17 2.2.9Removing the flywheel assembly (F) & (R) (See Fig.18 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 assem

30、bly downward. Fig.18 Fig.19 B Slide chassis assembly Head Tape guide B Pinch arm spring Head 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) KS-FX621 (No.49825

31、)1-11 2.2.10 Disassembling the flywheel assembly (F) (See Fig.20 and 21) (1) Push and turn counterclockwise 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

32、 felt. Fig.20 Fig.21 2.2.11 Disassembling the flywheel assembly (R) (See Fig.20 and 22) (1) Push and turn clockwise 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

33、 and the felt. Fig.22 Fig.23 2.2.12 Removing the reel board (See Fig.23 and 24) (1) Remove the two screws C attaching the reel board. (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

34、 MODE switch and the ST-BY switch. The mode position between EJECT and ST-BY is optimum for reattaching. Connect the card wire extending from the reel board to the FFC pad before reattaching the reel board. Fig.24 Flywheel assembly (F) Flywheel assembly (R) Joints p Joint p Joints q Joint q Polywash

35、er Spring holder (F) TU spring Friction gear play Flywheel assembly (F) Felt Polywasher Spring holder (R) FF spring Friction gear FF Flywheel assembly (R) Felt FFC pad Joint r Reel board C C FFC pad CT-1 switch ST-BY switch Soldering MODE switch KS-FX621 1-12 (No.49825) 2.2.13 Removing the gear base

36、 arm / gear base link assembly (See Fig.25 to 27) (1) Move the gear base arm in the direction of the arrow. (2) Insert 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 fro

37、m the main chassis while re- leasing the two joints s. (4) Move the gear base link assemby in the direction of the 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. Fig.25 Fig.26 2.2.1

38、4 Removing the FFC pad (See Fig.27 and 29) (1) Push each joint hook u of the FFC pad and remove toward the bottom. Fig.27 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 KS-F

39、X621 (No.49825)1-13 2.2.15 Removing the mode gear (See Fig.28 and 31) (1) Remove the polywasher on the bottom and pull out the mode gear. 2.2.16 Removing the mode switch actuator (See Fig.28, 29 and 31) (1) Pull out the mode switch actuator at the bottom. REFERENCE: When reattaching the mode switch

40、actuator to the main chas- sis, make sure to set on the shaft and insert v into the slot w. 2.2.17 Removing the direction link / direction plate (See Fig.29 to 31) (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

41、. (3) Move the direction plate in the direction of the arrow to re- lease the two joints a. REFERENCE: When reattaching the direction plate, engage the two joints a and move in the direction of the arrow (Refer to Fig.30). REFERENCE: When reattaching the direction link, move the direction plate in t

42、he direction of the arrow and engage the three joint x, y and z at a time (Refer to Fig.31). 2.2.18 Removing the mode rack assembly (See Fig.29 and 30) (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

43、b Eon the bottom of the mode rack assembly into the slots of the main chassis and move in the direction of the arrow (See Fig.30). Fig.28 Fig.29 Fig.30 Fig.31 Polywasher Mode switch actuator Mode gear Direction plate Direction link Mode rack assembly Slot wDirection plate Joints a Joint z Direction

44、link Polywasher Joint y Joint x Direction plateMode rack assembly Joint c Joint b Joint b Joints a Polywasher Mode gear Mode switch actuator Direction link Direction plate Mode rack assembly v KS-FX621 1-14 (No.49825) 2.2.19 Removing the gear base assembly / take up gear / reflector gear (See Fig.32

45、 to 34) (1) Push in the pin d of the gear base assembly on the upper side of the body and move the reflector gear toward the bottom, then pull out. (2) Remove the polywasher on the bottom and pull out the take up gear. (3) Move the gear base assembly in the direction of the arrow to release it from

46、the two slots e of the main chassis. REFERENCE: The parts are damaged when removed. Please replace with new ones. Fig.32 Fig.33 2.2.20 Removing the reel driver / reel spindle (See Fig.34) (1) Draw out the reel driver from the shaft on the main chassis and remove the reel driver spring and the reel s

47、pindle re- spectively. CAUTION: The reel driver is damaged when removed. Please replace with a new one. Fig.34 Gear base assembly Pin d Slot e Slot e Polywasher Reflector gear Take up gear Reel driver spring Reel driver spring Reel driver Reel driver Reel spindle Reel spindle Gear base assembly Slot

48、s e? Main chassis Reflector gear Polywasher Take up gear KS-FX621 (No.49825)1-15 2.2.21 Removing the side bracket assembly (See Fig.35 to 39) (1) Remove the eject cam plate spring. (2) Push the joint f through the slot to remove the load rack downward. (3) Move the eject cam limiter in the direction

49、 of the arrow to release it from the boss gof the side bracket assembly and from the two joints h. (4) Move the eject cam plate in the direction of the arrow to re- lease the joint i. CAUTION: When reassembling, confirm operation of each part before re- attaching the eject cam plate spring. Fig.35 Fig.36 Fig.37 Fig.38 Fig.39 Joint f Load rack Eject cam plate spring Eject cam limiter Side bracket assembly Boss g Joint h Load rack Joint f Joint h Boss g Eject cam limiter Side bracket assembly Joint h Joint h Eject cam plate Side bracket assembly Boss g Joint i Ej