Pioneer CDJ-2000NXS Service Manual page 44

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[6] Contents of drive self-diagnosis
(1) CD-LD LIFE CHECK
The addition time which LD had turned on is checked
and degradation condition is judged.
If addition time is over 7000 H, display it with NG.
NG judgment reason: Because the Laser Diode becomes
1% of the rate of failure in 7000 H or more.
Over 7000 H in the case of "NG", you measure LD
current, and perform failure judgment of the Pickup
B
Assy. (The details of the LD current measurement, see
"5.2 FAILURE JUDGEMENT OF THE PICKUP ASSY".)
(2) DVD-LD LIFE CHECK
Same as the above.
(3) FOCUS ACTUATOR CHECK
To detect the disconnection of the actuator.
Current is passed to an actuator using an external circuit,
and a disconnection part is detected by reading the
voltage value divided by resistance by A/D. State of FFC
C connector mounting, state of FFC insertion, and
disconnection of the actuator are detected synthetically.
Since the probability which Focus and Tracking both
disconnect is low, as for the case of both NG, suspect
FFC insertion.
(4) TRACKING ACTUATOR CHECK
Same as the above.
(5) STEPPER CHECK
To detect "A stop of the Stepper by foreign substance
mixing, the stack, etc", "the defect of an inside switch",
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and "the step-out of the Stepper by the shortage of
lateral-pressure with faulty mechanism parts".
It checks that the Stepper can perform predetermined
operation certainly using an inside switch.
(6) OEIC CHECK
To detect omission of OEIC.
It detects by checking disk existence using CD.
(7) DISC MOTOR CHECK
To detect the defect of a spindle motor.
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A motor is started and the attainment time to 2000 rpm
is checked.
(8) CD-LD POWER & LENS DIRT CHECK
It checks whether CD-LD power adjustment is appropriate
and whether the object lens is dirty.
The peak value and bottom value of the main beams
A, B, C, and D are measured by A/D, and it judges
whether it is the level which can continue a playback.
(9) OPTICAL SYSTEM DIRT CHECK
Same as the above.
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(10) CD ERROR RATE CHECK
An error rate is measured and the last check is performed.
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STEP 1
CDJ-2000NXS
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STEP 2
(11) DVD-LD POWER CHECK
It checks whether DVD-LD power adjustment is
appropriate and whether the object lens is dirty.
The peak value and bottom value of the main beams
A, B, C, and D are measured by A/D, and it judges
whether it is the level which can continue a playback.
(12) DVD ERROR RATE CHECK
An error rate is measured and the last check is
performed.
STEP 3
(13) USER CD PHYSICAL CHECK
When there is offer of a disc from a user, it distinguishes
whether it is that a disc is the cause.
The characteristic of a user disk is checked from
automatic adjustment value.
A disk uses only CD (from a past actual result).
(14) USER CD SCRATCH CHECK
The error rate of the whole disk is measured per
1 minute, and best value and worst value are calculated.
The state of a disc is checked from those relations.
(15) USER CD QUALITY CHECK
Same as the above.
(16) USER CD DIRT CHECK
Same as the above.
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