JVC XVN320B
Manual de Servicio

5.2

Check points for each error

5.2.1 Spindle start error (1) Defective spindle motor � Are there several ohms resistance between each pin of CN201 "2-3","3-4","2-4"? (The power supply is turned off and measured.) (2) Defective spindle motor driver (IC201) � Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(UOUT,VOUT,WOUT) of CN201"2,3,4" and IC201"19,18,17"? � Is FG pulse output from the terminal of IC201"41"(FG) according to the rotation of the motor? (3) Has the control signal come from the microcomputer? � Is it "H" while the terminal of IC201"48"(MUTE1) is operating? � Is the control signal input to the terminal of IC201"25"(SPDRV)? � Is the SVREF voltage input to the terminal of IC201"26"(VREF)? (4) Is the FG signal input to the servo IC? � Is FG pulse input to the terminal of IC301"175"(FGIN) according to the rotation of the motor? 5.2.2 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 "40" (FE)? 5.2.3 Traverse movement NG (1) Defective traverse driver � Has the voltage come between terminal of CN201 "7" and "8" ? (2) Defective BTL driver (IC201) � Has the motor drive voltage gone out to IC201"11" or "14"? (3) Has the control signal come from the microcomputer? � TRSDRV Is the signal input? (IC301 "161") (4) TRVSW is the signal input to microcomputer? (IC301 "177") 5.2.4 Focus ON NG � Is FE output ? --- Pattern, IC101 � Is FODRV signal sent ? (R275) --- Pattern, IC301 "160" � Is driving voltage sent ?IC101 "3", "4" --- If NG, pattern, driver, mechanical unit . � Mechanical unit is defective. 5.2.5 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) Relative component or IC it self is defective. � Microcomputer (IC301) When improperly adjusted due to defective IC.

(No.YD053)1-19