JVC QL-F6 Service Manual
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JVC QL-F6, Transistors No, Parts Number Rating Description Maker 2SD794(P 10W 55 MHz Silicon 2SD794(P Q) 2SD794(P Q) 2SD794(P Q) 2SA733(P 250 mW 180 MHz 2SA733(P Q) 2SA733(P Q) 2SA733(P Q) 2SB605(K 800 mW 120 MHz X10 2SB605(K L) X11 2SB605(K L) X12 2SB605(K L) X13 2SC2259(G F) X14 2SD325V(D 10W 8MHz Sanyo X15 2SC945(P 250 mW 250 MHz X16 2SA733(P K) 180 MHz X17 2SC945(P 250 MHz X18 2SC945(P K) X19 2SC945(P K) X20 2SC641K(B 100 mW 400 MHz Hitachi X21 2SC641K(B C) X22 2SC945(P 250 mW 250 MHz X23 2SC945(P K) X24 2SC945(P K) X25 2SC945(P K) X26 2SC945(P K) X27 2SC945(P K) I nt
JVC QL-F6, 5. Replacement Procedures 5-( 1) Stylus Stylus replacement (See Fig. 2) Replacement of the stylus can be easily made by simply inserting the stylus plug (A) into the jack (B) of the cartridge. Service life of the stylus employed for this unit (DT- Zl EB) is generally as follow; varying, depend- ing on the record condition (dirty record groove etc. Stereo LP record (30 cm) . . . Approx. 300 - 500 hours Stylus are disposable items. Therefore, it is recommended to buy a supply of styli when you buy the unit. When purchasing them , specify the DT-Zl EB (JVC standard). 5-(2) Headshell Removal and mounting of the headshell (See Fig. 3) Turn the connector nut in the direction of " A
JVC QL-F6, 13. QL- Schematic Diagram -------- , rp;;;- ------' 25A733(P'K) 25A733(P'Q) i Motor 1 r- ..... ---- I EART 'bW IRE I 250794 25B605(K L) 25C641K(B C) 25C945(K i HG-1 HG-2 I I ~ Ii t~L I B ~ E C~/7 E I r-: FG 8~ XI-X4 I I ~~R 1"11,1I!11~11.11111,1I,1 . r lr~l 1 L'::" :;;~;;-;-,;;;~'" ,j.;.- a: lJlJ .J 5tgnalclrcultafQL- r - -- f-- ~I-. - =;--(g,~ SPE ~SELECT SW. PITCH CONTROL METE l::_ N-'='f--~ ~ f--~ ~. ~~(:\~ O! ~ J C' ~ O ~~Z; + ,/- r,... f--;:;-;;; " -;;; .;;- ;:: a, ;;;--
JVC QL-F6, 9. Troubleshooting Charts 9-( 1) Platter does not rotate 1. Turntable does not rotate. Turntable does not rotate when start button is depressed. Cooo,ct Yes R,p"" Yes Replace the pilot lamp. Check the trans- former for dis- connected wires and damaged printed pattern. Check X15 , 02. Yes -+/ X17 is defective. 12 - X16 is defective. Fig. 24 Yes Check all driving coils. Check transistors X1 - X12 , and Hall elements HG1 , HG2. Note: Don t disconnect the motor from electronic circuits while troubleshooting as tra
JVC QL-F6, 7-(8) Tracking Force Fig. 13 Fig. 14 Fig. 15 Fig. 16 1. Tracking force adjustment 1. Turn the anti-skaing knob until the " 0" mark is aligned with the index line. (See Fig. 13) 2. Turn the HQ damping knob until the " 0" mark is al igned with the index line. (See Fig. 6) 3. Turn the VQ damping knob until the " 0" mark is aligned with the index line. (See Fig. 14J 4. Place a disc on the platter. 5. Remove the stylus cover from the stylus. (See Fig. 15) 6. Release the tonear
JVC QL-F6, (3) Pitch Control operates abnormally. Pitch control functions incorrectly. Check for disconnected wire(s) in the meter whether VR1 is open or if the meter leads are disconnected. Check if R64 is dis- connected and whether X22 is open. Replace if necessary. 2. Meter deflects to positive side and remains there. Collector and emitter of X 18 are short-cir- cuited. Replace this transistor. Readjust and observe 14 - Is D6 or D7 short- circu ited? Replaced. Yes Disconnected or de- fective R 11. Replace. Yes Check if R52 is dis- connected. Replace if def
JVC QL-F6, 10-(2) Mechanism Ass C(ID No. Parts Number Description E22883-002 Base Ass E60395-001 Reset Plate E60394-003 Switch Plate Ass E60392-O02 Switch Plate E60393- 002 Switch Lever G4942- Speed Nut E65740-O01 Spring E35851- 001 Dr. Gear Ass E35850-O01 Driving Gear E60398-O01 Lead- I n Lever E65741- 001 Push Lever E60912-001 Speed Nut E60399- 001 Spring E65742-O01 E60400-O02 Idler Gear E60405-003 Sub Gear Ass E60402- 002 Sub Gear E60403-O01 Hook E60912-001 Speed Nut E60404-001 Spring E65744-O01 Ratchet Cam E65745-001 Spring E60912-001 Speed Nut E65746-O01 Start Lever
10-(3) Tonearm Ass' 102-16 ( ~ 102-II '\ ( "'-3 I \ ~?!j 102-17 \ //- - (j) I I 1 102-4 I / - , \ 102-12--j 'r ( 101-5 I I Ei 101 1 I L ~ 102-5 / '\ /"- 103 )i / y'.:'- ~ , ... 'r / 110 /J~ eY ~;;/ / 110 -2 . . / . ' , / / I~/ ~02 - " , / ~ /,/,~ \ ~ / ~~~/ ~102 , , ~~. ,/ ~) ; 102-3 \ ~~
2. HQ DAMPING knob This controls the horizontal movement of the tone- arm while aiding to keep the tonearm s resonating point low. Set the knob to the same indication num- ber as the optimum tracking force of this unit. 3. VQ DAMPING knob This controls the vertical movement of the tonearm while aiding to keep the tonearm s resonating point low. Set the knob to the same
JVC QL-F6, 14. Packing Materials and Part Numbers E34725- 002 Nylon Covering E36997- 020 Protect Sheet G6771- Caution Label E22934- 001 Platter Case E22493- 311 Corner Pad PK- QLF6E Carton Box 24- E22949- 002 Sheet Ass NZ- QLF6 Packing Sheets and Pad E61848- 001 Plate QL- No. 2464
JVC QL-F6, How to make adjustments if the pitch control meter should indicate incorrectly (when the meter does not display " 0" in the QUARTZ LOCK operation). (See Fig. 1. Disconnect the power cord from the outlet. 2. Remove the platter from the motor shaft. 3. Turning the " 0" position adjusting screw clockwise moves the indication to the right. Turning this screw counterclockwise moves the indi- cation to tl:1e-left. Generally, there is no need for adjustment since proper adjustment has been performed at the factory. Should the indication of the meter be inco
15. Parts List with Specified Numbers for Designated Areas Item s. Military No. Description Canada Europe Austral ia Market and Other Cou ntries Motor Board Ass E 10302- 004 E 1 0302- 004 E 1 0302- 004 E 10302- 003 E 1 0302.004 E 1 0302- 002 Tonearm Ass ARM- 529 ARM- 529 MP-201S ARM-529 MP-201S MP- 201S Servo Control C. Board Ass MDC938G- MDC938G- MDC938G- MDC938G- MDC938G- MDC
JVC QL-F6, Specifications MOTOR SECTION (These specifications apply only to the quartz lock mode. Motor : Core less , DC type FG servomotor : Phase- locking to the quartz oscillator : Direct drive : 33- 1/3 Servo system Drive system Speeds Fine pitch adjustable range Wow and flutter Signal- to-noise ratio Speed detection Starting torque Speed deviation Load characteristics Drift Power characteristics Temperature characteristics Platter TONEARM SECTION Type Effective arm length Overhang Weight range including headshell : :!: 6 % (at the pitch control mode) : 0. 025 % (WRMS) : More than 78 dB (DIN- : Frequency generator : More than 1. 2 kg-cm : Within 0. 002 % : 0 % (with 170 g total tracking
JVC QL-F6, 25D325 (D, F) 15553 15953 W02 NJM4558D- D. NJM4558D .... I 2 IC4, IC5 RD24EB3 25C2259 (F, G) VDI220 / ' -7, / AC DI D4~D9, DIO~DI2 D'5 , DI6 D3, D13, D14 X14 X 13 METER (t270)JA) NJM78L08A Out :: MSM4001 VC4046 IC2 GRY --------, ORG RI3 FUSE 2 Cia O11500V I R77 E03032- P. TRANS REO REO R58 15K rips-iaGAr 104 I m C12 47~125 R55 A7K RI2 4. RIO 6. CP Out STOut 33L145H RC HC Oul 15 13 G'I C35 I 0.047 I GND I . TPI Uli 12 13 V 14 In. 6KHz lC3t,W,~NO. I ~:::____ BRN CD BL ~__ 2..:..~ GRN LAMP QL (Q) GND QL ON QUARTZ RI7 R20 IlK 1.8 R19 27K R21 l.aK CP In FsOut Fs In FG In RC HC Oul ----v--------' F/V GNO 250794 2SA733 (P 25B605 (K, 2
JVC QL-F6, 7-(9) Anti-skating Anti-skaing adjustment Adjust the anti-skaing force accord ing to the cartridge being used. Turn the anti-skating knob dial to the same number on the tracking force dial. Use the 8 marked dial when employing a spherical stylus. Use the marked dial for an elliptical or a Shibata stylus. Set the " 75" of the - marked dial to the index line since the QL- F6 is provided with an elliptical stylus and the track- ing force has been adjusted to 1. 75 g. (See Fig. 21) 7 -( 10) HO/VO Damping Turn the HQ damping control and the VQ damping control knobs until the " 75" marks on the dial are aligned with the index line , since the optimum tr
JVC QL-F6, 4. Names of Parts and Their Functions Mat Dust cover Center spindle Platter Fig. 1 1. OIL DAMPED TONEARM Ordinarily tonearms have a resonance frequency of between 5 to 10Hz. If the peak of the range of a tonearm is too high , accurate tracking of the tone- arm with the record groove cannot be obtained be- cause the tonearm resonates at a frequency generated by ambient vibrations or sound pressure, or the tone- arm can be influenced by adverse conditions of the record such as warps , etc. The OIL DAMPED TONEARM i~ designed to suppress the range of resonance b
(2) Platter rotates at high speed. Platter rotates at high speed. Rotates at high speed when the start button is depressed. Does connecting the base of X16 to +24 V stop rotation? When the terminals of R30 , R31 , R32 are grounded , does rotation stop? X 16 is defective. Replace. QL- No. 2464 Yes I s rectangular waveform present at Pin 7 of IC4? Yes X17 is defective. Replace
JVC QL-F6, No. Parts Number Descrip~ion See table below. Motor Board Ass E65588- 001 Lock Plate E49447- 004 Shaft E66140- 001 Rubber Sheet E35480- 002 Mark E35869.o01 Fittings G4942- Speed Nut G4942-4 E22873- 001 Panel E22911.o01 Base OSP221 0- 059 Push Switch E65912- 001 Knob OVD7A2B- 014 V. Resistor E61713- 003 VR. Knob 35981- 001 Meter Ass Ol.P3201- 1240 Lamp E04353- 001 Color Cap (Green) E04353- 002 (Blue) LPSP3008ZS Ass y Screw F2001 Mechanism Base Ass SBSB3008Z Tapping Screw SBSB2608Z E65714- 001 Knob E65715- 003 Lever Knob See table below. T
JVC QL-F6, Resistors No. Parts Number Rating Description R52 R E35YQ- 3KF 3 k.l1 Metalized Film R53 RE35YQ- 7KF 4:7 k.l1 R55 QRD143J- 473 47 k.l1 Carbon R58 RE35YQ- 15KF 15 k.l1 Metalized Film R59 RE35YQ- 6KF k.l1 R60 QRD146J- 100 10.11 Carbon R61 QRD143J- 103 10 k.l1 R62 QRD143J- 103 R63 QRD143J- 103 R64 QRD143J- 473 47 k.l1 R66 QRD143J- 153 15 k.l1 R67 QRD143J- 103 10 k.l1 R68 QRD143J- 102 1 k.l1 R69 QRD143J- 273 27 k.l1 R70 QRD143J- 104 100 k.l1 R71 QRD143J- 104 R72 QRD143J- 182 k.l1 R73 QRD143J- 104 100 k.l1 R74 QRD143J- 122 k.l1 R76 QRD143J- 102 1 k.l1 11-(2) TPS- 206 Fuse P . C. Board Ass (Diffe
JVC QL-F6, (5) HQ/VQ Damping Knobs When replacement of VQ or HQ damping knob becomes necessary, do it in the following sequence. . How to replace the HQ damping knob (Fig. 6) 1. Remove the 2 screws securing the HQ damping knob and remove the knob. 2. Turn the HQ controller clockwise until it stops. 3. Clamp the tonearm to its rest. 4. Mount the new HQ damping knob on the HQ con- troller with the indication " 3" on the knob aligned with the index line. Secure it with the 2 screws. 5. After replacing it , perform adjustment referring to the section " How to use " on page 4. . How to replace the VQ
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