JVC KS-FX725R user manual

Summary of the content on the page No. 4

KS-FX725R Removing the heat sink (See Fig.4) 1. Remove the three screws A on the left side of the body. Heat sink AA Fig.4 Joint b Removing the bottom cover Bottom cover (See Fig.5 , 6) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat sink. 1. Turn over the body and unjoint the five joints b with the bottom cover and the body using a screwdriver. Joint c Joint b CAUTION: When disengaging the joint c using a Rear panel sc

Summary of the content on the page No. 5

KS-FX725R Removing the main board B C (See Fig.7 , 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. D D 1. Remove the screw B, the three screws C and the two screws D attaching the rear bracket on the back Rear panel of the body. Remove the rear panel. C Fig.7 2. Remove the two screws E attaching the main board on the bottom of the body. Disconnect connector CP401 on the main board in the di

Summary of the content on the page No. 6

KS-FX725R Removing the control switch board (See Fig.10 ~ 12) Prior to performing the following procedure, remove the front panel assembly. 1. Remove the four screws G attaching the rear cover G G on the back of the front panel assembly. 2. Unjoint the ten joints d with the front panel and the rear cover. 3. Remove the control switch board on the back of the front panel. Rear cover G G Fig.10 Joint d Front panel Joint d Joint d Joint d Rear cover Fig.11 Front panel Control switch board Fig.

Summary of the content on the page No. 7

KS-FX725R REFERENCE: 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). Removing the reinforce bracket Mode gear (See Fig.1 and 2) 1. Remove the screw A attaching the reinforce bracket on the bottom of the body. Reinforce bracket 2. To release joint a, turn and detach the reinforce A bracket from the side bracket assembly as shown in Fig.1 Fig.2 Removing the cassette guide (Se

Summary of the content on the page No. 8

KS-FX725R Load arm Removing the load arm (See Fig.5) 1. Remove the E-washer attaching the load arm. 2. Move the load arm in the direction of the arrow and release the joint e on the cassette catch. E-washer Joint e Fig.5 Cassette holder assembly Removing the cassette hanger assembly / Boss g Side bracket Cassette hanger cassette holder (See Fig.6 to 9) assembly 1. Check the mode is set to EJECT. Push down the Boss g front part of the cassette holder and move in the direction of the arrow t

Summary of the content on the page No. 9

KS-FX725R Removing the side bracket assembly Side bracket assembly (See Fig.10 to 12) Joint l 1. Remove the screw C attaching the side bracket assembly. Joint m 2. Detach the front side of the side bracket assembly upward and pull out forward to release the joint l and C m in the rear. CAUTION: When reassembling, make sure that the boss n 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 n. Side bracket as

Summary of the content on the page No. 10

KS-FX725R Removing the pinch arm (F) assembly (See Fig.13 and 14) 1. Remove the polywasher and pull out the pinch arm (F) assembly. 2. Remove the compulsion spring. Polywasher Pinch arm Polywasher Pinch arm (F) assembly (R) assembly Removing the pinch arm (R) assembly Fig.13 Polywasher (See Fig.13 and 15) Pinch arm (F) assembly 1. Remove the polywasher and pull out the pinch arm (R) assembly. Compulsion spring Removing the slide chassis assembly (See Fig.16 and 17) REFERENCE: It is not nec

Summary of the content on the page No. 11

KS-FX725R Removing the head / tape guide D (See Fig.18 and 19) Slide chassis assembly 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 D, the head and the head Head Tape guide support spring. Fig.18 3. Remove the pinch arm spring from the tape guide. D 4. Remove the tape guide and the pinch spring arm. Pinch arm spring CAUTION: When reattaching the pinch arm spring, set both end of it to the pinc

Summary of the content on the page No. 12

KS-FX725R Disassembling the flywheel assembly (F) (See Fig.22 and 23) 1. Push and turn counterclockwise the spring holder (F) Flywheel assembly (F) Flywheel assembly (R) to release the three joints s on the bottom of the flywheel. 2. The spring holder (F), the TU spring and the friction gear play come off. Joints s Joints t 3. Remove the polywasher and felt. Disassembling the flywheel assembly (R) Joint t (See Fig.22 and 24) Joint s 1. Push and turn clockwise the spring holder (R) to Fig.2

Summary of the content on the page No. 13

KS-FX725R Removing the gear base arm / gear base Gear base arm Joint w Joints v link assembly (See Fig.27 to 29) 1. Move the gear base arm in the direction of the arrow. Hook x 2. Insert a slotted screwdriver to the gear base spring under the gear base arm, and release the gear base FFC pad arm upward from the boss on the gear base assembly. Hook x 3. Remove the gear base arm from the main chassis while releasing the two joints v. 4. Move the gear base link assemby in the direction of Gear

Summary of the content on the page No. 14

KS-FX725R Mode gear Mode switch actuator Removing the mode gear (See Fig.30 and 33) 1. Remove the polywasher on the bottom and pull out the mode gear. Removing the mode switch actuator Polywasher (See Fig.30, 31 and 33) 1. Pull out the mode switch actuator at the bottom. Direction plate Direction link REFERENCE: When reattaching the mode switch Fig.30 actuator to the main chassis, make sure to Mode rack assembly Direction plate Slot z set on the shaft and insert y into the slot z. Removing

Summary of the content on the page No. 15

KS-FX725R Slot f' Removing the gear base assembly / take up gear / reflector gear (See Fig.34 to 36) 1. Push in the pin e’ of the gear base assembly on the upper side of the body and move the reflector gear toward the bottom, then pull out. Gear base assembly 2. Remove the polywasher on the bottom and pull out Pin e' the take up gear. 3. Move the gear base assembly in the direction of the arrow to release it from the two slots f’ of the main chassis. Slot f' Fig.34 REFERENCE: The parts are

Summary of the content on the page No. 16

KS-FX725R Removing the side bracket assembly (See Fig.37 to 41) 1. Remove the eject cam plate spring. 2. Push the joint g‘ through the slot to remove the load rack downward. Joint g' 3. Move the eject cam limiter in the direction of the arrow to release it from the boss h’ of the side bracket assembly and from the two joints i’. 4. Move the eject cam plate in the direction of the arrow to release the joint j’. CAUTION: When reassembling, confirm operation of each part before reattaching the

Summary of the content on the page No. 17

KS-FX725R Main motor Removing the main motor assembly / F assembly sub motor assembly (See Fig.42 to 44) Reduction gear (B) Belt Reduction 1. Remove the belt at the bottom. gear (A) Polywasher 2. Remove the polywasher and pull out the mode gear. Sub motor 3. Pull out the reduction gear (B). assembly G 4. Remove the polywasher and pull out the reduction gear (A). Mode gear Polywasher 5. Remove the two screws F attaching the main motor assembly. Fig.42 6. Remove the two screws G attaching t

Summary of the content on the page No. 18

KS-FX725R Adjustment method Test instruments reqired for adjustment Standard volume position 1. Digital osclloscope(100MHz) Balance and Bass,Trable volume, Fader 2. Frequency Counter meter :Center(Indication"0") 3. Electric voltmeter Loudness,Dolby NR,Sound,Cruise:Off 4. Wow & flutter meter Volume position is about 2V at speaker output with 5. Test tapes following conditions.Playback the test tape VT721. for TAPA CURL confirmation MC-109C ................... (without Padd type) FM1/FM2: 87.5MH

Summary of the content on the page No. 19

KS-FX725R Arrangement of adjusting & test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Azimuth screw A (Forward) Playback head Azimuth screw B (Reverse) Head section view Azimuth screw B Azimuth screw A (Reverse) (Forward) Playback Head 1-19

Summary of the content on the page No. 20

KS-FX725R Arrangment of adjusting VR402:Rch VR401:Rch (Dolby NR level adj) (Dolby NR Frequency response adj) Head amplifier board section (Reverse side) C418 C413 C419 C416 R412 C414 11 R416 C421 C422 R414 C412 VR401 Q401 1 R415 1 C410 R418 VR402 21 R413 1 B402 IC401 31 T11 FSMW1093A C411 R423 R422 B409 B404 CJ403 2 2 IC402 1 R425 CJ401 1 B413 Information for using a car audio service jig 1. We're advancing efforts to make our extension cords common for all car audio products. Please use this ty