1-13
XV-D721BK
XV-D723GD
Check points for each error
(1) Spindle start error
*Defective spindle motor
Are there 10ohms resistance between each pin of CN102 "1~4"?
(The power supply is turned off and measured.)
*Hall element: Is sine wave output between CN102 "10" and "11", between "12" and "13",
and between "14" and "15" during rotation?
In either case, replace the mechanical unit.
*Defective spindle driver (IC251)
Is a driving wave output from CN102 "1~4" ?
Is IC251 "9" at "H" level (START)?
Servo IC --- Is control signal sent to the motor driver ?
IC201 "95" : Duty is 50% during stop, but varies during rotation (greatly varies at start).
--- If not sent, pattern or servo IC (IC201) is defective.
R259 : approx 2.5V during stop, but varies during rotation (greatly varies at start).
--- of not sent, pattern or servo IC (IC201) is defective.
Is FG input to servo IC ?
Observe FG wave from IC201 "89". --- If not output, pattern, IC251 or IC201 is defective.
During
rotation
(2) Disc Detection, Distinction error (no disc, no REFNV)
* Laser is defective.
* Front End Processor is defective (IC101).
* APC circuit is defective. --- Q101.
* Pattern is defective. --- Lines for CN101 "15" and "17".
Lines for between IC201 "2" and IC101 "2"(LDONA),
between IC201 "3" and IC101 "1" (LDONB).
* Servo IC is defective (IC201).
* Is signal sent to IC201(servo)"71" AS2 ?
* IC101 --- For signal from IC101 to IC301, is signal output from IC101 "88" (RFAS1) and
IC101 "69" REENV ?
Содержание XV-D721BK
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