Check Points For Each Error - JVC XV-SA600BK Service Manual

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 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?
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 "20" (ASOUT) and
IC101 "41"(RFENV) and IC101 "22" (FEOUT)?
XV-SA600BK/XV-SA602SL
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