JVC HR-XVC22UC Service Manual page 27

5.4 Check points for each error (DVD SECTION)
5.4.1 Spindle start error
(1) Defective spindle motor driver (IC201)
• Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(WOUT,VOUT,UOUT)
of CN201"2,3,4" and IC201"17,18,19"?
• Is FG pulse output from the terminal of IC201"41"(FG) according to the rotation of the motor?
(2) Has the control signal come from servo IC or the microcomputer?
• Is it "H" while the terminal of IC201"48"(/SPMUTE) is operating?
(3) Is the FG signal input to the servo IC?
• Is FG pulse input to the terminal of IC301"72"(FG) according to the rotation of the motor?
5.4.2 Disc Detection, Distinction error (no disc, no RFENV)
• Laser is defective.
• SODC is defective (IC301).
• APC circuit is defective. --- Q102,Q104.
• Pattern is defective. --- Lines for
5.4.3 Traverse movement NG
(1) Defective traverse driver
• Has the voltage come between terminal of
(2) Defective BTL driver (IC201)
• Has the motor drive voltage gone out to IC201"11" or "14"?
(3) TRSDRV Is the signal input?
(4) TRVSW is the signal input from microcomputer?
5.4.4 Focus ON NG
• Is FODRV signal sent ? (R254) --- Pattern,
• Is driving voltage sent ?
• Mechanical unit is defective.
5.4.5 Tracking ON NG
• 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.
5.4.6 Spindle CLV NG
• Does not the input or the output of driver's spindle signal do the grip?
• Has the tracking been turned on?
• Spindle motor and driver is defective.
5.4.7 Address read NG
• Besides, the undermentioned cause is thought though specific of the cause is difficult because various factors are thought.
Mechanism is defective. (jitter)
IC301
The disc is dirty or the wound has adhered.
5.4.8 Between layers jump NG (double-layer disc only)
Mechanism defective
Defect of driver's IC(IC201)
Defect of servo control IC(IC301)
5.4.9 Neither picture nor sound is output
(1) It is not possible search
CN101 - All patterns which relate to pick-up and patterns between IC301.
CN101 "2" and "4" ?
(IC301 "75")
(IC301
IC301 "148"
IC201 "9", "10" --- If NG, pattern, driver, mechanical unit .
"79")
(No.YD008)1-27