Removing the front panel assembly (See Fig.1) 1. Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. Front panel assembly Eject button Fig.1 Joint a Removing the front chassis assembly (See Fig.2 , 3) Prior to performing the following procedure, remove the front panel assembly. 1. Release the four joints a on both sides of the front chassis assembly and remove the front chassis assembly toward the front. Joint a Front chassis assembly Fig.2 Heat sink Joint a Joint a Front chassis assembly Fig.3 1-3 KS-FX725R Removing the heat sink (See Fig.4) 1. Remove the three screws A on the left side of the body. Heat sink A A Fig.4 Joint b Removing the bottom cover (See Fig.5 , 6) Bottom cover 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 CAUTION: When disengaging the joint c using a Joint b screwdriver, do not damage or break the Rear panel board. Fig.5 Joint b Bottom cover Joint c Joint b Rear panel Fig.6 1-4 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 of the body. Remove the rear panel. 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 direction of the Main board arrow. E E CP401 Fig.8 Removing the cassette mechanism section Cassette mechanism section (See Fig.9) F F Top chassis 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. 1. Remove the four screws F attaching the cassette mechanism section on the back of the top chassis. F F Fig.9 1-5 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. G Rear cover G Fig.10 Joint d Front panel Joint d Joint d Joint d Rear cover Fig.11 Front panel Control switch board Fig.12 1-6 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 (See Fig.1 and 2) Mode gear 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 (See Fig.3) 1. Turn the mode gear to set to RVS play or Joint a subsequent mode. 2. Remove the cassette guide from the main chassis while releasing each two joint tabs b in the direction Reinforce bracket of the arrow. Removing the head board (See Fig.4) 1. Remove the screw B on the upper side. Unsolder the wires on the under side of the head board, if necessary. Fig.2 REFERENCE: When reassembling, twist the wires by turning the head board twice remarked c and pass through the notch d as shown in Fig.4. Head board Soldering B Cassette guide Head board notch d Tab b c Tab b Fig.3 Fig.4 1-7 KS-FX725R Removing the load arm (See Fig.5) Load arm 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 cassette holder (See Fig.6 to 9) Side bracket Cassette hanger 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 to release the joint f. Joints f 2. Move the rear part of the cassette hanger assembly in the direction of the arrow to release it from the two joint bosses g. 3. Release the holder stabilizer spring from the hooks h Cassette holder assembly and i, then pull out from the cassette hanger Fig.6 assembly. Cassette hanger assembly Cassette stabilizer spring 4. Bring up the rear side of the cassette hanger assembly to release the joint j and k. 5. Pull out the cassette catch from the cassette hanger assembly. Hook i Hook h Fig.7 Cassette hanger assembly Cassette holder assembly Cassette catch Cassette holder assembly Cassette hanger assembly Hook j Hook k Fig.8 Fig.9 1-8 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 m in the rear. C 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 assembly Fig.10 CAUTION: After reattaching the side bracket assembly, confirm operation. Side bracket assembly Joint l Joint m Load rack Boss n Boss n Fig.11 Load rack Fig.12 1-9 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 Pinch arm Polywasher (R) assembly (F) assembly Removing the pinch arm (R) assembly Fig.13 Polywasher (See Fig.13 and 15) 1. Remove the polywasher and pull out the pinch arm Pinch arm (F) assembly (R) assembly. Compulsion spring Removing the slide chassis assembly (See Fig.16 and 17) REFERENCE: It is not necessary to remove the head Pinch arm and the tape guide. (R) assembly Polywasher 1. Move the slide chassis assembly in the direction of the arrow to release the two joints o and remove from the main chassis. 2. Remove the rack link. CAUTION: When reassembling, first reattach the rack link, and next fit the boss p and hook q of Fig.14 the slide chassis assembly to the hole of the main chassis, and engage the two joints o. Fig.15 Head Tape guide Boss p Rack link Hook q Joint o Joint o Slide chassis assembly Fig.16 Fig.17 1-10 KS-FX725R Removing the head / tape guide (See Fig.18 and 19) D 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 support spring. Tape guide 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 pinch spring arm ( remarked r). Head Head support spring CAUTION: When reattaching the head, set the wires into the groove of the tape guide (Fig.18). Tape guide r Removing the flywheel assembly (F) & (R) Pinch spring arm (See Fig.20 and 21) REFERENCE: It is not necessary to remove the slide r chassis assembly. 1. Remove the belt at the bottom. 2. Remove the two polywashers on the upper side. Slid chassis assembly 3. Pull out each flywheel assembly downward. Fig.19 Polywasher Flywheel assembly (F) Belt Polywasher Flywheel assembly (F) Flywheel assembly (R) Flywheel assembly (R) Fig.20 Fig.21 1-11 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.22 release the three joints t on the bottom of the flywheel. 2. The spring holder (R), the FF spring and the friction gear FF come off. Polywasher Polywasher 3. Remove the polywasher and the felt. Spring holder (R) Spring holder (F) Removing the reel board (See Fig.25 and 26) FF spring TU spring 1. Remove the two screws E attaching the reel board. Friction gear FF 2. Move the reel board in the direction of the arrow to Friction gear play release the joint u. 3. Unsolder the wires if necessary. Felt Felt CAUTION: When reattaching, confirm operation of the MODE switch and the ST-BY switch. Flywheel assembly (F) The mode position between EJECT and Flywheel assembly (R) ST-BY is optimum for reattaching. Fig.23 Fig.24 Connect the card wire extending from the reel board to the FFC pad before reattaching the reel board. FFC pad FFC pad CT-1 switch E Joint u MODE switch Soldering Reel board ST-BY switch E Fig.25 Fig.26 1-12 KS-FX725R Removing the gear base arm / gear base Gear base arm Joint w link assembly (See Fig.27 to 29) Joints v 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 the arrow to release the two joints w. Gear base link assembly Joint w Fig.27 REFERENCE: When reattaching the gear base arm, make sure that the boss on the gear base assembly is inside the gear base Gear base spring spring. Gear base arm Screwdriver Removing the FFC pad (See Fig.27 and 29) 1. Push each joint hook x of the FFC pad and remove toward the bottom. Fig.28 Gear base link assembly Gear base arm FFC pad Fig.29 1-13 KS-FX725R Mode switch actuator Mode gear 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 Direction plate Slot z Mode rack assembly set on the shaft and insert y into the slot z. Removing the direction link / direction plate (See Fig.31 to 33) Joints d' 1. Remove the polywasher attaching the direction link. 2. Bring up the direction link to release the three joints a', b' and c' at a time. Joint c' Joint b' Direction link Polywasher Joint a' 3. Move the direction plate in the direction of the arrow to release the two joints d'. Fig.31 Joint k' Direction plate Mode rack assembly REFERENCE: When reattaching the direction plate, Joint k' engage the two joints d' and move in the Joint l' direction of the arrow (See Fig.32). REFERENCE: When reattaching the direction link, move the direction plate in the direction of the arrow and engage the three joint a', b' and c' at a time (See Fig.33). Joints d' Fig.32 Removing the mode rack assembly Direction link (See Fig.31 and 32) Mode switch actuator 1. Move the mode rack assembly in the direction of the Polywasher arrow to release the two joints k' and the joint l'. REFERENCE: When reattaching, set the two k' on the y bottom of the mode rack assembly into the slots of the main chassis and move in the Mode gear direction of the arrow (See Fig.32). Direction plate Mode rack assembly Fig.33 1-14 KS-FX725R Removing the gear base assembly / take Slot f' 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. 2. Remove the polywasher on the bottom and pull out Gear base assembly 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 damaged when removed. Please replace with new ones. Polywasher Take up gear Reflector gear Fig.35 Removing the reel driver / reel spindle Reel driver (See Fig.36) Reel driver Reel driver spring 1. Draw out the reel driver from the shaft on the main chassis and remove the reel driver spring and the Reel driver spring Reel spindle reel spindle respectively. Gear base assembly CAUTION: The reel driver is damaged when Reel spindle removed. Please replace with a new one. Slots f' Main chassis Take up gear Reflector gear Polywasher Fig.36 1-15 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 eject cam plate spring. Load rack Eject cam plate spring Fig.37 Side bracket assembly Boss h' Eject cam limiter Boss h' Joint i' Eject cam limiter Side bracket assembly Joint i' Joint g' Joint i' Eject cam plate Joint i' Fig.39 Load rack Side bracket assembly Fig.38 Side bracket assembly Boss h' Eject cam plate Joint j' Eject cam plate Joint j' Fig.41 Fig.40 1-16 KS-FX725R Main motor Removing the main motor assembly / F assembly sub motor assembly (See Fig.42 to 44) Reduction gear (B) Belt 1. Remove the belt at the bottom. Reduction gear (A) 2. Remove the polywasher and pull out the mode gear. Polywasher Sub motor 3. Pull out the reduction gear (B). assembly 4. Remove the polywasher and pull out the reduction G gear (A). Mode gear 5. Remove the two screws F attaching the main motor Polywasher assembly. 6. Remove the two screws G attaching the sub motor Fig.42 assembly. 7. Unsolder the wires on the reel board if necessary. Reduction gear (B) Polywasher CAUTION: When reassembling, adjust the length of the wires extending from the sub motor Reduction gear (A) asswmbly by attaching them to the side of G F the sub motor assembly with the wires extending from the main motor assembly using a spacer. Spacer Main motor assembly Sub motor assembly Fig.43 Main motor assembly Sub motor assembly Spacer Fig.44 1-17 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. MC-109C ................... for TAPA CURL confirmation (without Padd type) FM1/FM2: 87.5MHz to 108.0MHz VT724 ....................... for DOLBY level measurement FM3 : 65MHz to 74 MHz VT739 ............ For playback frequency measurement AM : (MW)522kHz to1620kHz VT712 .... For wow flutter & tape speed measurement (LW) 144kHz to 279kHz VT703 ..................... For head azimuth measurement 6. Torque gauge .................... Cassette type for CTG-N (mechanism adjustment) Measuring conditions(Amplifier section) Power supply voltage .............. DC14.4V (11V to 16V allowance) Line-Out Level/Impedance....... 2.0V/20k load(250 nWb/m) ........... 1-18 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 KS-FX725R Arrangment of adjusting VR402:Rch VR401:Rch (Dolby NR level adj) (Dolby NR Frequency response adj) Head amplifier board section (Reverse side) C413 C419 C416 C418 R412 C414 R411 11 R410 B401 R408 R416 C422 C421 R414 C412 VR401 Q401 R415 1 1 R418 C410 B411 B410 VR402 B407 21 R413 1 B402 R417 R420 IC401 R401 C409 31 R406 R405 C405 C406 C404 B408 T11 Q403 C417 C424 FSMW1093A C411 C401 R404 R407 R403 C407 R402 C403 C402 C408 R423 B409 R422 B405 R424 B406 R426 C423 B404 B403 2 CJ403 2 B412 Q402 C415 D401 D402 IC402 C425 R425 CJ401 1 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 type of extension cord as follows. 2. As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly after disassembly. 3. Extension cord : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assembly and main board assembly. Check for mechanism driving section such as motor ,etc.. Cassette mechanism Disassembly method 1. Remove the bottom cover. 2. Remove the front panel assembly. 3. Remove the top cover . 4. Install the front panel. 5. Confirm that current is being carried by connecting an extension cord jig. Note Available to connect to the CP701 connector when in- stalling the front panel. Extension cord EXTKSRT002-18P to Cassette mechanism Main board to Main board Front panel assembly EXTKSRT002-18P 1-20 KS-FX725R Item Conditions Adjustment and Confirmation methods S.Values Adjust 1. Head Test tape: Head height adjustment azimuth SCC-1659 Adjust the azimuth directly. When you adjustment VT703(10kHz) adjust the height using a mirror tape, remove the cassette housing from the mechanism chassis. After installing the cassette housing, perform the azimuth adjustment. A line 1. Load the SCC-1659 mirror tape. Adjust with height adjustment screw A and azimuth Head shield adjustment screw B so that line A of the mirror tape runs in the center between Lch The head is at low position and Rch in the reverse play mode. during. 2. After switching from REV to FWD then to REV, check that the head position set in B line procedure 1 is not changed. (If the position has shifted, adjust again and check.) Head shield 3. Adjust with azimuth adjustment screw B so The head is at High position that line B of the mirror tape runs in the during REV. center between Lch and Rch in the forward play mode. Output Head azimuth adjustment level: Maximum 1. Load VT724 (1kHz) and play it back in the reverse play mode. PBHead Set the Rch output level to max. FWD Adj B 2. Load VT703 (10kHz) and play it back in the forward play mode. Adjust the Rch and Lch output levels to max, with azimuth adjustment screw B. In this case, the phase difference should be within 45 . REV Adj C HEIGHT Adj A 3. Engage the reverse mode and adjust the output level to max, with azimuth adjustment screw C. (The phase difference should be 45 or more.) phase (0 ) (45 ) 4. When switching between forward and reverse modes, the difference between channels should be within 3dB. (Between FWD L and R, REV L and R.) 5. When VT721 (315Hz) is played back, the level difference between channels should be within 1.5dB. 2. Tape speed Test tape: VT712 1. Check to see if the reading of the F, counter / Tape speed: Built-in volume and wow (3kHz) wow flutter meter is within 3015 3045(FWD 3015 resistor flutter / REV), and less than 0.35% (JIS RMS). 3045Hz confirmation Wow 2. In case of out of specification, adjust the flutter: less motor with a built-in volume resistor. than 0.35% 3. Play back Test tape: VT724 1. Play test tape VT724, and set the volume Speaker out frequency (1kHz) position at 2V. 1kHz / 63Hz response VT739 :0 3db confiramation (63Hz / 1kHz / 10kHz) 2. Play test tape VT739 and confirm. 1kHz / 10kHz 1kHz / 10kHz: -1 3dB, : -1 3db 1kHz / 63Hz: 0 3dB, 3. When 10kHz is out of specification, it will be necessary to read adjust the azimuth. The tuner section is of an adjustment-freedesign. In case the tuner is in trouble, replace the tuner pack. 1-21 KS-FX725R Description of major ICs UPD178018AGC584(IC701) : System controller micon 1.Terminal Layout 24