Jvc-KSFX-772-R-Service-Manual(1) 电路图 维修手册.pdf

SERVICE MANUAL CASSETTE RECEIVER No.49694 Mar. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KS-FX772R KS-FX772R CD CHANGER CONTROL SEL TP/PTY DISP SSM 4 FM/AM TAPE CD- CH DAB SCMMODE 789101112RNDRPTMO KS-FX772R Area Suffix EContinental Europe Contents Safety precaution Disassembly method Adjustment method Description of major ICs 1-2 1-3 1-18 1-22 RadioFans.CN 收音机爱 好者资料库 1-3 KS-FX772R Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. 1. Removing the front panel assembly (See Fig.1) Prior to performing the following procedure, remove the front panel assembly. Release the four joints a on both sides of the front chassis assembly and remove the front chassis assembly toward the front. 1. Removing the front chassis assembly (See Fig.2 , 3) Disassembly method Fig.1 Fig.2 Fig.3 Front panel assembly Eject button Joint a Joint a Front chassis assembly Front chassis assembly Heat sink Joint a Joint a RadioFans.CN 收音机爱 好者资料库 1-4 KS-FX772R Remove the three screws A on the left side of the body. 1. Removing the heat sink (See Fig.4) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat sink. Turn over the body and unjoint the five joints b with the bottom cover and the body using a screwdriver. 1. Removing the bottom cover (See Fig.5 , 6) Fig.4 Fig.5 Fig.6 Heat sink A A Joint b Joint b Joint b Joint b Joint b Joint b Bottom cover Bottom cover Rear panel Rear panel RadioFans.CN 收音机爱 好者资料库 1-5 KS-FX772R Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the three screws C and the two screws D attaching the rear bracket on the back of the body. Remove the rear panel. Remove the two screws E attaching the main board on the bottom of the body. Disconnect connector CN701 on the main board in the direction of the arrow. 1. 2. Removing the main board (See Fig.7 , 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink, the bottom cover and the main board. Remove the four screws F attaching the cassette mechanism section on the back of the top chassis. 1. Removing the cassette mechanism section (See Fig.9) Fig.7 Fig.8 Fig.9 Rear panel B D D C C Main board E E CN701 Cassette mechanism section F F FF Top chassis 1-6 KS-FX772R Prior to performing the following procedure, remove the front panel assembly. Remove the four screws G attaching the rear cover on the back of the front panel assembly. Unjoint the eleven joints c with the front panel and the rear cover. Remove the control switch board on the back of the front panel. 1. 2. 3. Removing the control switch board (See Fig.10 12) Fig.10 Fig.11 Fig.12 G G G G Rear cover Joint c Joint c Joint c Joint c Front panel Rear cover Front panel Control switch board 1-7 KS-FX772R Turn the mode gear to set to RVS play or subsequent mode. Remove the cassette guide from the main chassis while releasing each two joint tabs a in the direction of the arrow. 1. 2. Removing the cassette guide (See Fig.2) Prior to performing the 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). REFERENCE: Remove the E-washer attaching the load arm. Move the load arm in the direction of the arrow and release the joint b on the cassette catch. 1. 2. Removing the load arm (See Fig.3) Fig.1 Fig.2 Mode gear Cassette guide Tab a Tab a Fig.3 Load arm E-washer Joint b 1-8 KS-FX772R Check the mode is set to EJECT. Push down the front part of the cassette holder and move in the direction of the arrow to release the joint c. Move the rear part of the cassette hanger assembly in the direction of the arrow to release it from the two joint bosses d. Release the holder stabilizer spring from the hooks e and f, then pull out from the cassette hanger assembly. Bring up the rear side of the cassette hanger assembly to release the joint g and h. Pull out the cassette catch from the cassette hanger assembly. 1. 2. 3. 4. 5. Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7) Fig.4 Fig.5 Fig.7 Fig.6 Cassette holder assembly Cassette holder assembly Side bracket Joints c Cassette holder assembly Cassette hanger assembly Cassette hanger assembly Cassette hanger assembly Boss d Boss d Cassette hanger assembly Cassette stabilizer spring Hook f Hook h Hook e Hook g Cassette holder assemblyCassette catch 1-9 KS-FX772R Remove the screw A attaching the side bracket assembly. Detach the front side of the side bracket assembly upward and pull out forward to release the joint i and j in the rear. 1. 2. Removing the side bracket assembly (See Fig.8 to 10) 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 operation. CAUTION: Fig.9 Fig.10 Fig.8 A Side bracket assembly Side bracket assembly Joint i Joint j Side bracket assembly Boss k Load rack Boss k Load rack Joint i Joint j 1-10 KS-FX772R Remove the polywasher and pull out the pinch arm (F) assembly. Remove the compulsion spring. 1. 2. Removing the pinch arm (F) assembly (See Fig.11 and 12) Remove the polywasher and pull out the pinch arm (R) assembly. 1. Removing the pinch arm (R) assembly (See Fig.11 and 13) Move the slide chassis assembly in the direction of the arrow to release the two joints l and remove from the main chassis. Remove the rack link. 1. 2. Removing the slide chassis assembly (See Fig.14 and 15) 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 the two joints l. CAUTION: It is not necessary to remove the head and the tape guide. REFERENCE: Fig.11 Fig.15 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 1-11 KS-FX772R Remove the band attaching the wire to the head. Remove the two screws B, the head and the head support spring. Remove the pinch arm spring from the tape guide. Remove the tape guide and the pinch spring arm. 1. 2. 3. 4. Removing the head / tape guide (See Fig.16 and 17) Remove the belt at the bottom. Remove the two polywashers on the upper side. Pull out each flywheel assembly downward. 1. 2. 3. Removing the flywheel assembly (F) & (R) (See Fig.18 and 19) 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). CAUTION: It is not necessary to remove the slide chassis assembly. REFERENCE: It is not necessary to remove the slide chassis assembly. REFERENCE: Fig.17 Fig.19 Fig.16 Fig.18 B Slide chassis assembly Head Tape guide B Pinch arm spring Head Head support spring Tape guide Pinch spring arm Slid chassis assembly Flywheel assembly (F) Flywheel assembly (R) BeltPolywasher Polywasher Flywheel assembly (F) Flywheel assembly (R) o o 1-12 KS-FX772R Push and turn counterclockwise the spring holder (F) to release the three joints p on the bottom of the flywheel. The spring holder (F), the TU spring and the friction gear play come off. Remove the polywasher and felt. 1. 2. 3. Disassembling the flywheel assembly (F) (See Fig.20 and 21) Push and turn clockwise the spring holder (R) to release the three joints q on the bottom of the flywheel. The spring holder (R), the FF spring and the friction gear FF come off. Remove the polywasher and the felt. 1. 2. 3. Disassembling the flywheel assembly (R) (See Fig.20 and 22) Remove the two screws C attaching the reel board. Move the reel board in the direction of the arrow to release the joint r. Unsolder the wires if necessary. 1. 2. 3. Removing the reel board (See Fig.23 and 24) When reattaching, confirm operation of the 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. CAUTION: Fig.24 Fig.20 Fig.21Fig.22 Fig.23 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 Flywheel assembly (F) Flywheel assembly (R) FFC pad FFC pad Joint r Reel board C C CT-1 switch ST-BY switch Soldering MODE switch Felt Felt 1-13 KS-FX772R Move the gear base arm in the direction of the arrow. 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. Remove the gear base arm from the main chassis while releasing the two joints s. Move the gear base link assemby in the direction of the arrow to release the two joints t. 1. 2. 3. 4. Removing the gear base arm / gear base link assembly (See Fig.25 to 27) Push each joint hook u of the FFC pad and remove toward the bottom. 1. Removing the FFC pad (See Fig.27 and 29) When reattaching the gear base arm, make sure that the boss on the gear base assembly is inside the gear base spring. REFERENCE: Fig.25 Fig.26 Fig.27 FFC pad Gear base link assembly Gear base arm 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 1-14 KS-FX772R Remove the polywasher on the bottom and pull out the mode gear. 1. Removing the mode gear (See Fig.28 and 31) Move the mode rack assembly in the direction of the arrow to release the two joints b and the joint c. 1. Removing the mode rack assembly (See Fig.29 and 30) Remove the polywasher attaching the direction link. Bring up the direction link to release the three joints x, y and z at a time. Move the direction plate in the direction of the arrow to release the two joints a. 1. 2. 3. Removing the direction link / direction plate (See Fig.29 to 31) When reattaching, set the two b on 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). REFERENCE: Pull out the mode switch actuator at the bottom.1. Removing the mode switch actuator (See Fig.28, 29 and 31) When reattaching the mode switch actuator to the main chassis, make sure to set on the shaft and insert v into the slot w. 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 the direction of the arrow and engage the three joint x, y and z at a time (Refer to Fig.31). REFERENCE: Fig.28 Fig.30 Fig.31 Fig.29 Polywasher Mode switch actuator Mode gear Direction plate Direction link Mode rack assembly Slot w Direction plate Joints a Joint z Direction link Polywasher Joint y Joint x Direction plateMode rack assembly Joint c Joint b Joint b Polywasher Mode gear Mode switch actuator Direction link Direction plate Mode rack assembly v Joints a 1-15 KS-FX772R 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. Remove the polywasher on the bottom and pull out the take up gear. Move the gear base assembly in the direction of the arrow to release it from the two slots e of the main chassis. 1. 2. 3. Removing the gear base assembly / take up gear / reflector gear (See Fig.32 to 34) Draw out the reel driver from the shaft on the main chassis and remove the reel driver spring and the reel spindle respectively. 1. Removing the reel driver / reel spindle (See Fig.34) The reel driver is damaged when removed. Please replace with a new one. CAUTION: The parts are damaged when removed. Please replace with new ones. REFERENCE: Fig.32 Fig.33 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 Slots e Main chassis Reflector gear Polywasher Take up gear 1-16 KS-FX772R Remove the eject cam plate spring. Push the joint f through the slot to remove the load rack downward. Move the eject cam limiter in the direction of the arrow to release it from the boss g of the side bracket assembly and from the two joints h. Move the eject cam plate in the direction of the arrow to release the joint i. 1. 2. 3. 4. Removing the side bracket assembly (See Fig.35 to 39) When reassembling, confirm operation of each part before reattaching the eject cam plate spring. CAUTION: Fig.35 Fig.37 Fig.39 Fig.36 Fig.38 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 Eject cam plate Side bracket assembly Eject cam plate Joint i 1-17 KS-FX772R Remove the belt at the bottom. Remove the polywasher and pull out the mode gear. Pull out the reduction gear (B). Remove the polywasher and pull out the reduction gear (A). Remove the two screws D attaching the main motor assembly. Remove the two screws E attaching the sub motor assembly. Unsolder the wires on the reel board if necessary. 1. 2. 3. 4. 5. 6. 7. Removing the main motor assembly / sub motor assembly (See Fig.40 to 42) When reassembling, adjust the length of the wires extending from the sub motor asswmbly by attaching them to the side of the sub motor assembly with the wires extending from the main motor assembly using a spacer. CAUTION: Fig.40 Fig.41 Fig.42 Belt Polywasher Polywasher Polywasher Mode gear Reduction gear (A) Main motor assembly D Sub motor assembly E Reduction gear (B) Reduction gear (B) Reduction gear (A) E D Main motor assembly Sub motor assembly Spacer Spacer Sub motor assembly Main motor assembly 1-18 KS-FX772R Adjustment method 1.Digital osclloscope(100MHz) Measuring conditions(Amplifier section) Power supply voltage Load impedance Line out level / Impedance for DOLBY level measurement For playback frequency measurement For wow flutter & tape speed measurement For head azimuth measurement Cassette type for CTG-N (mechanism adjustment) DC14.4V(11V to 16V allowance) 4 (4 to 8 allowance) 2.0V / 20k Tuner area Band range FM : 87.5MHz to 108.0MHz AM : (MW) 522kHz to 1620 kHz (LW) 144kHz to 279 kHz DUMMY LOAD Exclusive dummy load should be used for AM and FM dummy load,there is a loss of 6dB between SSG output and antenna input. The loss of 6dB need not be considered since direct reading of figures are applied in this working standard. Test Instruments reqired for