JVC XV-M5GSL, Service Manual

Page: 27 / 62

(No.XA008)1-27
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 "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?
[ CN201"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 CN201"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?
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 "20" (ASOUT) and IC101 "41"(RFENV) and IC101 "22"
(FEOUT)?
5.2.3 Traverse movement NG
(1) Defective traverse driver
• Has the voltage come between terminal of CN101 "21" and "23" ?
(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")
5.2.4 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.
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)
Constant or IC it self is defective.
• Servo IC (IC301)
When improperly adjusted due to defective IC.