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5.5
Check points for each error (DVD SECTION)
5.5.1 Spindle start error
(1) Defective spindle motor
• Are there several ohms resistance between each pin of
(The power supply is turned off and measured.)
• Is the sign wave of about 100mVp-p in the voltage had from each terminal?
[ CN201"10"(H1+),"11"(H1-),"7"(H2+),"8"(H2-),"5"(H3+),"6"(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"1,2,3" 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?
5.5.2 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
•
IC101
--- For signal from IC101 to IC301, is signal output from
(FEOUT)?
5.5.3 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"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?
(4) TRVSW is the signal input from microcomputer?
5.5.4 Focus ON NG
• Is FE output ? --- Pattern,
• Is FODRV signal sent ? (R209) --- Pattern,
• Is driving voltage sent ?
• Mechanical unit is defective.
5.5.5 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.
CN101
- All patterns which relate to pick-up and patterns between
CN101
"2" and "4" ?
(IC301
"67")
(IC301
IC101
IC301
"115"
IC201
"13", "14" --- If NG, pattern, driver, mechanical unit .
CN201
"1-2","2-3","1-3"?
IC101
"20" (ASOUT) and
"56")
IC101
IC101
"41"(RFENV) and
IC101
(No.YD002)1-33
"22"
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