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8
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
Details of the procedures are described in “5 Electrical Adjustments”.
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.
adjustments.
When performing adjustments, use the specified values for adjustments.
• 0.9 mW power
Specified value : 0.84 to 0.92 mW
• 7.0 mW power
Specified value : 6.8 to 7.2 mW
lop (at 7mW)
lop (at 7mW)
• Labeled on the optical pickup
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points a, b, and c
C1 error : Below 220
AD error : Below 2
C1 error : Below 220
AD error : Below 2
• Error rate check
Specified value:
a.When using test disc (MDW-74/AU-1)
a.When using test disc (MDW-74/AU-1)
C1 error : Below 80
AD error : Below 2
AD error : Below 2
b.When using check disc (TDYS-1)
C1 error : Below 50
• CPLAY error rate check
Specified value:
C1 error : Below 80
AD error : Below 2
C1 error : Below 80
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
(@@, ## are both arbitrary numbers)
Laser power check
(5-6-2 : See page 37)
(5-6-2 : See page 37)
Traverse check
(5-6-3 : See page 37)
Focus bias check
(5-6-4 : See page 38)
(5-6-3 : See page 37)
Focus bias check
(5-6-4 : See page 38)
C PLAY check
(5-6-5 : See page 38)
(5-6-5 : See page 38)
Self-recording/playback
check
(REC/PLAY)
(5-6-6 : See page 38)
check
(REC/PLAY)
(5-6-6 : See page 38)
TEMP check
(Temperature
compensation
offset check)
(5-6-1 : See page 37)
(Temperature
compensation
offset check)
(5-6-1 : See page 37)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the
• Replace the overwrite head
• Check for disconnection of the circuits around the
overwrite head
If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around D101
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around D101
(BD board)
• Check the signals around IC101, IC121, CN102,
CN103 (BD board)
Measure if unsatisfactory:
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