Sony MXD-D4 - Pre-Repair Checks and Adjustments (MD); Laser Power, Auto, and Temp Compensation Checks

9
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS IN MD
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”.
• 0.9 mW power
Specified value : 0.80 to 0.96 mW
• 8.4 mW power
Specified value : 8.2 to 8.6 mW
• Iop (at 8.4mW)
Labeled on the optical pick-up
Iop value ± 10mA
• Unsatisfactory if displayed as “NG: XXXX”
NG
(XXXX is arbitrary number)
• Unsatisfactory if displayed as “T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(6-2 : See page 35)
Auto check
(6-4 : See page 36)
Temperature
compensation
offset check
(6-1 : See page 35)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Check for disconnection of the circuits around
D101 (BD (MD) board)
• Check the signals around IC101, IC151, CN102,
CN103 (BD (MD) board)
Measure if unsatisfactory:
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.