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JVC XVN50BK
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of JVC XVN50BK Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 23 (click to view)
XV-N50BK,XV-N55SL

3.12Check points for each error 3.12.1 Spindle start error (1) Defective spindle motor • Are there several ohms resistance between each pin of CN101 "5-6","6-7","5-7"? (The power supply is turned off and measured.) • Is the sign wave of about 100mVp-p in the voltage had from each terminal? [ CN101"9"(H1+),"10"(H1-),"11"(H2+),"12"(H2-),"13"(H3+),"14"(H3-) ] (2) Defective spindle motor driver (IC251) • Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(SM1~3) of CN101"5,6,7" and IC251"2,4,7"? • Is FG pulse output from the terminal of IC251"24"(FG) according to the rotation of the motor? • Is it "L(about 0.9V)" while terminal of IC251"15"(VH) is rotating the motor? (3) Has the control signal come from servo IC or the microcomputer? • Is it "L" while the terminal of IC251"18"(SBRK) is operating? Is it "H" while the terminal of IC251"23"(/SPMUTE) is operating? • Is the control signal input to the terminal of IC251"22"(EC)? (changes from VHALF voltage while the motor is working.) • Is the VHALF voltage input to the terminal of IC251"21"(ECR)? (4) Is the FG signal input to the servo IC? • Is FG pulse input to the terminal of IC301"69"(FG) according to the rotation of the motor? 3.12.2 Disc Detection, Distinction error (no disc, no RFENV) • Laser is defective. • Front End Processor is defective (IC101). • APC circuit is defective. --- Q101,Q102. • Pattern is defective. --- Lines for CN101 - All patterns which relate to pick-up and patterns between IC101 • IC101 --- For signal from IC101 to IC301, is signal output from IC101 "21" (ASOUT) and IC101 "36"(RFENV) and IC101 "20" (FEOUT)? 3.12.3 Traverse movement NG (1) Defective traverse driver • Has the voltage come between terminal of CN101 "49" and "50" ? (2) Defective BTL driver (IC201) • Has the motor drive voltage gone out to IC201"17" or "18"? (3) Has the control signal come from servo IC or the microcomputer? • Is it "H" while the terminal of IC201"9"(STBY1) ? • TRSDRV Is the signal input? (IC301 "67") (4) TRVSW is the signal input from microcomputer? (IC301 "56") 3.12.4 Focus ON NG • Is FE output ? --- Pattern, IC101 • Is FODRV signal sent ? (R209) --- Pattern, IC301 "115" • Is driving voltage sent ? • IC201 "13", "14" --- If NG, pattern, driver, mechanical unit . • Mechanical unit is defective. 3.12.5 Tracking ON NG • When the tracking loop cannot be drawn in, TE shape of waves does not settle. • Mechanical unit is defective. Because the self adjustment cannot be normally adjusted, the thing which cannot be normally drawn in is thought. • Periphery of driver (IC201) Constant or IC it self is defective. • Servo IC (IC301) When improperly adjusted due to defective IC. (No.A0041)1-23

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