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JVC UX-T77 Service Manual
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JVC UX-T77 Service Manual

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SERVICE MANUAL
MICRO COMPONENT SYSTEM
Contents
1-2
1-3
1-4
1-5
1-7
1-16
This service manual is printed on 100% recycled paper.
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
UF
Flow of functional operation
until TOC read
UX-T77
UX-T77
Area Suffix
China
1-20
1-21
1-21
1-22
No.20865
1-1
Aug. 2000

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  • Page 1 UX-T77 UX-T77 SERVICE MANUAL MICRO COMPONENT SYSTEM UX-T77 Area Suffix China Contents Safety precautions Flow of functional operation Preventing static electricity until TOC read 1-20 Important for laser products Maintenance of laser pickup 1-21 Location of main parts Replacement of laser pickup...
  • Page 2 UX-T77 Safety precautions 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.
  • Page 3 UX-T77 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.1. Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
  • Page 4 UX-T77 Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam.
  • Page 5 UX-T77 Location of main parts Operation switch board Front panel assembly LCD system CPU board Power amplifier board Heat sink Head amplifier & mechanism control board Power supply board Fig. 1 Bottom chassis Tuner board CD player unit Power amplifier board Fig.
  • Page 6 UX-T77 AUX jack Power amplifier board Speaker output terminal EXT. AM antenna terminal Heat sink Tuner board AC socket EXT. FM antenna terminal Fig. 3 Power supply board Din jack CD mechanism unit CD case Optical pickup unit CD mechanism board CD servo control board Fig.
  • Page 7 UX-T77 Disassembly method Removing the rear panel (See Fig. 1 and 2) 1. From behind the body, remove the seven screws A retaining the rear panel. 2. After turning the body upside down, remove the two screws B retaining the rear panel.
  • Page 8 UX-T77 Removing the CD player unit CD player unit (See Fig. 7 and 8) 1. Remove the rear panel. CN604 CN603 2. Remove the left and right side panels. 3. From the connectors CN603,CN604 on the CD servo control board, disconnect the card wires outgoing from...
  • Page 9 UX-T77 LCD system CPU board Removing the tuner board (See Fig. 11) CN701 1. Remove the rear panel. 2. Remove the left and right side panels. 3. Remove the CD player unit. 4. From the right side of the body, remove the one screw G retaining the tuner board.
  • Page 10 UX-T77 Removing the cassette mechanism unit LCD system CN731 (See Fig. 14) CPU board 1. Remove the rear panel. 2. Remove the left and right side panels. 3. Remove the CD player unit. 4. Remove the power amplifier board. 5. Remove the front panel assembly.
  • Page 11 UX-T77 Removing the operating switch board (See Fig. 17 and 18) [MULTI-JOG] button 1. Remove the rear panel. Operating switch board 2. Remove the left and right side panels. 3. Remove the CD player unit. 4. Remove the front panel assembly.
  • Page 12 UX-T77 <<Cassette mechanism section>> Cassette mechanism Removing the Playback/Recording & Eraser Head (See Fig. 1 to 3) 1. While shifting the trigger arms seen on the right side of the head mount in the arrow direction, turn the flywheel R in counterclockwise direction...
  • Page 13 UX-T77 Removing the Head amplifier & Mechanism control board (See Fig. 4) Belt 1. Remove the cassette mechanism assembly. Main motor CN32 2. After turning over th cassette mechanism assembly, assembly remove the three screws A retaining the head amplifier & mechanism control board.
  • Page 14 UX-T77 Removing the Flywheel (See Fig. 7 and 8) 1. Remove the head amplifier & mechanism control P.C. board. 2. Remove the main motor assembly. Flywheel R Flywheel L 3. After turning over the cassette mechanism, remove the slit washers 1 and fixing the capstan shafts R and L, and pull out the flywheel R and L respectively from behind the cassette mechanism.
  • Page 15 UX-T77 <<CD Player Unit Section>> Solenoid Removing the CD mechanism and CD servo control P.C. board (See Fig. 1 and 2) 1. Remove the rear panel. CN601 2. Remove the left and right side panels. 3. Remove the CD player unit.
  • Page 16 UX-T77 Adjustment method Measurement instruments required for Tuner section adjustment Voltage applied to tuner +B : DC5.7V 1. Low frequency oscillator VT : DC 12V This oscillator should have a capacity to output Reference measurement 26.1mV(0.28V)/4 0dBs to 600 at an oscillation frequency of output 50Hz-20kHz.
  • Page 17 UX-T77 <<Arrangement of adjusting positions>> Cassette mechanism section Cassette mechanism section (Bottom side) Head azimuth Head azimuth adjusting screw adjusting screw (Forward side) (Reverse side) Playback/Recording & Head azimuth Head azimuth eraser head adjusting screw adjusting screw (Forward side) (Reverse side) Playback/Recording &...
  • Page 18 UX-T77 Tape Recorder Section Adjusting Measurement Standard Items Measurement method positions conditions Values Adjust the head Confirmation Test tape 1 Playback the test tape TMT7036 (10kHz) Maximum azimuth screw of head angle : TMT7036 (10kHz) 2 With the recording & playback mechanism,...
  • Page 19 UX-T77 Electrical Performance Adjusting Measurement Standard Items Measurement method positions conditions Values L ch AC-225 Adjustment of Mode: Forward or 1 With the recording and playback : VR31 : 4.20 recording bias reverse mode mechanism, load the test tapes (AC-514 to...
  • Page 20 UX-T77 Flow of functional operation until TOC read Check Point Slider turns REST Power Key Power ON Check that the voltage at the pin17 SW ON. of CN604 is 0V (a moment)? Automatic tuning of TE offset Check that the voltage at the...
  • Page 21 UX-T77 Replacement of laser pickup Maintenance of laser pickup (1) Cleaning the pick up lens Turn off the power switch and,disconnect the Befor you replace the pick up, please try to power cord from the ac outlet. clean the lens with a alcohol soaked cotton swab.
  • Page 22 UX-T77 Description of major ICs MN35510 (IC603) : Digital servo & digital signal processor 1. Pin layout 20 ~ 41 ~ 2.Block diagram LRCKIN(MSEL) AVSS1 8TIMES BCLK(SSEL) AVDD1 DIGITAL OVER SAMPUNC SRDATAIN OUTR DEEMPHSIS DIGITAL FILTER 1BIT (PSEL) LOGIC IOSEL...
  • Page 23 UX-T77 3. Pin function symbol I/O Function symbol I/O Function BCLK Not used Tracking error shunt signal output(H:shunt) LRCK Not used PLAY Not used SRDATA Not used WVEL Not used DVDD1 Power supply (Digital) RF signal input DVSS1 Connected to GND...
  • Page 24 UX-T77 AN8806SB-W (IC601) : RF & Servo AMP 1.Pin layout PDAC PDBD LDON PDER PDFR TBAL RF OUT FBAL RF IN C.AGC EF OUT C.ENV TE OUT C.EA CROSS CS BDO TE BPF VDET CS BRT LD OFF OFTR VREF /NRFDET 2.Block diagram...
  • Page 25 UX-T77 3. Pin function Pin No. Symbol Function APC amp input terminal APC amp output terminal LD ON APC ON/OFF control terminal Connect to ground Power supply Inverse input pin for RF amp RFamp output RF OUT RF IN RF input Connecting pin of AGC loop filter C.AGC...
  • Page 26 UX-T77 UPD78064GF-108 (IC701) : System CPU 1.Pin layout 2.Pin function Symbol Symbol Function Function [RESET/CLOSE] switch USDATA URESET/CLOSE Serial data Abnormal voltage detection 1 USCK USAFETY1 Serial clock Abnormal voltage detection 2 UQRIN USAFETY0 CD Q code data Body key input 1...
  • Page 27 UX-T77 TA2057N (IC1) : FM / AM IF AMP & Detector 1.Block d iagrams IF IN Vstb IF IN QUAD FM OUT AM OUT MPX IN LPF 1 LPF 2 L OUT DIVIDE MUTE DECODE LEVEL AM/FM MONO BUFF IF REQ...
  • Page 28 UX-T77 BH3852S (IC38) : E.Volume 1. Block diagrams (BASS) (TREBLE) TONE CONTROL CONTROL TONE CONTROL (BASS) (TREBLE) 2. Pin function Function Function Symbol I/O Symbol I/O Pin No. Pin No. BASS Terminal for bass control. Connect to GND. Terminal for treble control.
  • Page 29 UX-T77 LA4705NA (IC31) : 2ch BTL power IC 1. Pin layout LA4705N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 2. Block diagram Vcc1 RIPPLE OUTPUT PIN TO Vcc FILTER...
  • Page 30 UX-T77 BA6897FP (IC602) : 4channel driver 1.Pin layout D.BUF CH1-OUTA D.BUF CH1-OUTB CH4-OUTA D.BUF CH1-INA CH4-OUTB Level Level shift shift D.BUF CH1-INB CH4-INA T.S.D TEST1 CH4-INB TEST2 BIAS IN MUTE DRIVER CH3-INB CH2-INB MUTE CH2-INA CH3-INA D.BUF D.BUF Level Level...
  • Page 31 UX-T77 KIA78S06P (IC703) : Regulator 1.Pin layout 2. Pin function Function Pin No. Output Common Input 1 2 3 3.Block diagram 3 INPUT 2 OUTPUT Q2 Q7 1 COMMON PIC-21043SP (IC702) : Remotocontrol receiver 1.Pin layout 2. Pin function Function Pin No.
  • Page 32 UX-T77 <<MEMO>> 1-32...
  • Page 33 UX-T77 UX-T77 VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK B.U 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan 1-33 No.20865 200008(O)
  • Page 34 UX-T77 Block diagram CN34 CN303 IC32 BASS BOOST J3002 CN31 Head(L) To L301 To Speaker E Head IC32 RB/REC AMP IC35 FUNCTION IC38 IC31 POWER E.VOLUME HEAD AMP BOARD J3001 J3003 AUX IN ANT. HEAD TERMINAL PHONE COIL AM 1...
  • Page 35 UX-T77 UX-T77 Standard schematic diagrams LCD system CPU section C7801 C7801 0.01 0.01 2SC2412K/R/-X 2SC2412K/R/-X Q7603 Q7603 BL701 BL701 R8016 R8016 R8012 R8012 2.7K 2.7K BL702 BL702 QGF1205F1-11 QGF1205F1-11 JS801 JS801 CN766 CN766 QSW0547-001 QSW0547-001 R7528 R7528 SAFETYCD SAFETYCD R7529...
  • Page 36 UX-T77 Function amplifier and power amplifier section R2083 IC31 LA4705NA IC32 BA15218N C2084 R3082 120K R3083 150K R3084 120K R3021 C2021 C2006 R2028 C1021 C1006 10/16 R1028 C1025 0.082 22/10 4.7K R2041 R1024 Q2041 R2024 C1084 R1041 0.0047 4.7K R1003...
  • Page 37 UX-T77 UX-T77 CD servo control section R605 270K TBAL CN605 R606 150K FBAL VMC0041-003 R609 R612 C691 100K C620 150P C617 0.022/25 180P C692 C623 C655 150P RFENV R681 C653 C693 TRCRS SUBQ 0.047/25 470K VDET SQCK 150P 0.022/25 STAT...
  • Page 38 UX-T77 Head amplifier & Mechanism control section PLAYBACK SIGNAL RECORDING SIGNAL...
  • Page 39 UX-T77 UX-T77 Tuner section FM RADIO/TUNER SIGNAL AM RADIO SIGNAL...
  • Page 40 UX-T77 Printed circuit boards Main board...
  • Page 41 UX-T77 UX-T77 LCD system & CPU board CD servo control board...
  • Page 42 UX-T77 Tuner board B120 B122 B121 B123 B124 B135 B131 B132 B134...
  • Page 43 UX-T77 Head amplifier & Mechanism control board Cassette switch board Cassette switch board 2-10...
  • Page 44 UX-T77 PARTS LIST [ UX-T77 ] * All printed circuit boards and its assemblies are not available as service parts. Areas Suffix UF --------------------------.China - Contents - Exploded View of General Assembly and Parts List CD Mechanism Ass'y and Parts List...
  • Page 45 UX-T77 <<MEMO>>...
  • Page 46 UX-T77 Exploded View of General Assembly and Parts List Block No. M1MM Power amplifier board LCD system light board Operating switch LCD system Power board CPU board supply board Function CD servo board control board Tuner board Head amplifier & mechanism...
  • Page 47 UX-T77 UX-T77 (General assembly) (General assembly) Parts list Parts list Block No. M1MM Block No. M1MM Item Parts number Parts name Q'ty Description Area Item Parts number Parts name Q'ty Description Area VYH3987-001SC IC HOLDER SPTE T0.4 VJG1473-023 FRONT PANEL...
  • Page 48 UX-T77 CD mechanism assembly and parts list Block No. Grease point FG-87HS (Grease to apply have to be a little for the exchange.) FG-87HS FG-87HS FG-87HS EXL-M7GB Parts list ( CD mechanism ) Block No. M2MM Parts number Parts name...
  • Page 49 UX-T77 Cassette mechanism assembly and parts list Block No. SLC-S1YPM Cassette switch board Head amplifier & mechanism control board...
  • Page 50 UX-T77 Parts list Cassette mechanism) Block No. M2MM Item Parts number Parts name Q'ty Description Area VKS1165-00G CHASSIS B.ASS'Y VKS2274-002 REEL GEAR VKW5286-002 B.T. SPRING VKS5559-001 PLAY IDLE GEAR VKS5597-00A BUND ASS'Y VKW5296-001 EARTH SPRING VKR4749-003 IDLE PULLEY VKH5786-003 SHAFT...
  • Page 51 UX-T77 Grease point 1/3 Grease EM-30L EM-30L UD-24 LEN-320M EM-30L EM-30L Fig.1 Fig.2 Fig.2 Fig.1 EM-30L Fig.3 Fig.3 Fig.4 EM-30L EM-30L EM-30L EM-30L Fig.4 (Remove the Head mount Ass'y on the Chasis Base)
  • Page 52 UX-T77 Grease point 2/3 EM-30L EM-30L Fig.1 Fig.5 Fig.5 Fig.1 EM-30L Fig.2 Fig.4 Fig.2 Fig.3 LEN-320M Note: It is a putting up of the control cam to UD-24H(Hanarl) and EM-30L LEN-320M(Grease)dipping on the Control cam Fig.4 Fig.3...
  • Page 53 UX-T77 Grease point 3/3 EM-30L EM-30L EM-30L EM-30L Fig.1 Fig.2 Fig.2 Fig.1 Fig.3 Fig.5 Fig.6 Fig.4 UD-24 Fig.4 UD-24 Fig.3 EM-30L EM-30L Fig.5 Fig.6 3-10...
  • Page 54 UX-T77 (Main board) Block No. 01 Electrical parts list Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area C 901 QFLC1HJ-104Z M CAPACITOR .10MF 5% 50V C3070 QER41HM-105 E CAPACITOR 1.0MF 20% 50V C 902...
  • Page 55 UX-T77 (Main board) Electrical parts list Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area Q9006 KTC3199/GL/-T TRANSISTOR R2051 QRE141J-154Y C RESISTOR 150K 5% 1/4W Q9007 KTC3199/GL/-T TRANSISTOR R2052 QRE141J-102Y C RESISTOR 1.0K 5% 1/4W...
  • Page 56 UX-T77 (Micon board) Block No. 02 Electrical parts list Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area C 604 QEK61AM-107Z-JB E.CAPA I.M 100MF 20% 10V R 610 QRE141J-154Y C RESISTOR 150K 5% 1/4W C 605...
  • Page 57 UX-T77 (Tuner board) Electrical parts list Block No. 03 Item Parts number Parts name Remarks Area Item Remarks Parts number Parts name Area NCB21HK-223X C CAPACITOR CN711 QGB1214K1-20S CONNECTOR TO AMP PWB CONT NCB21EK-473X C CAPACITOR CN712 QGB1214K1-06S CONNECTOR TO AMP PWB SIG.
  • Page 58 UX-T77 (Tuner board) Electrical parts list Block No. 03 Item Parts number Parts name Remarks Area Item Remarks Parts number Parts name Area D 21 KV1555N-T VARI CAPACITOR R 11 NRSA02J-104X MG RESISTOR DI701 QLD0042-001 44PIN R 12 NRSA02J-222X MG RESISTOR...
  • Page 59 UX-T77 (Tuner board) Electrical parts list Block No. 03 Item Remarks Parts number Parts name Area Item Remarks Parts number Parts name Area R7081 NRSA02J-104X MG RESISTOR R7731 NRSA02J-222X MG RESISTOR R7082 NRSA02J-104X MG RESISTOR R7732 NRSA02J-222X MG RESISTOR R7083...
  • Page 60 UX-T77 (CD servo board) Block No. 04 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 101 NCS21HJ-821X C CAPACITOR 820PF 5% 50V IC 33 BU4094BCF-X C 102 NCS21HJ-221X C CAPACITOR...
  • Page 61 UX-T77 (CD servo board) Block No. 04 Electrical parts list Item Remarks Parts number Parts name Area R 315 NRSA02J-100X MG RESISTOR 10 5% 1/10W R 316 NRSA02J-223X RES. C.M 22K 5% 1/10W R 317 NRSA02J-100X MG RESISTOR 10 5% 1/10W...
  • Page 62 UX-T77 Packing Materials and Accessories Parts List Block No. M4MM Block No. M5MM A2,A3,A4 3-19...
  • Page 63 UX-T77 Packing parts list Block No. M4MM Item Parts number Parts name Q'ty Description Area QPC04504515P POLY BAG FOR SET QPA01202505 POLY BAG FOR P.CORD VPE3026-004 POLY BAG FOR INST QPA01702503P POLY BAG FOR AM ANT LV31089-004A CARTON VPH1709-001 CUSHION(UPPER)
  • Page 64 UX-T77 <<MEMO>> 3-21...

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