Sony MDS-NT1 service manual Laser power check

MDS-NT1

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”.

Note: This set uses optical pick-up KMS-262E in the production, but for the repair, only the KMS-262A is supplied. As a result, two types of optical pick-ups are used for this set, and the specified values for the check and adjustment of the laser power vary depending on the type.Details of the identify of KMS-262A/KMS-262E are described in “5-4. How to Identify Optical Pick-up KMS-262A/KMS-262E”. (See Page 26)

	Criteria for Determination	Measure if unsatisfactory:
	(Unsatisfactory if specified value is not satisfied)
Laser power check	• 0.90 mW power	• Clean the optical pick-up
(5-7-2 : See page 28)	Specified value : 0.84 to 0.92 mW (KMS-262A)	• Adjust again
	0.90 to 0.96 mW (KMS-262E)	• Replace the optical pick-up
	• 8.40 mW power
	Specified value : 8.1 to 8.7 mW (KMS-262A)
	8.4 to 8.9 mW (KMS-262E)
	• Iop (at 8.4mW)	• Replace the optical pick-up
	Labeled on the optical pick-up
	Iop value ± 10mA
Auto check	• Unsatisfactory if displayed as “NG: XXXX”	• Replace the optical pick-up
(5-7-4 : See page 29)	NG
	(XXXX is arbitrary number)
Temperature	• Unsatisfactory if displayed as “T=@@ (##) [NG”	• Check for disconnection of the circuits around
compensation	NG	D101 (BD board)
offset check	(@@, ## are both arbitrary numbers)	• Check the signals around IC101, IC201, CN102,
(5-7-1 : See page 28)		CN103 (BD board)

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.

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