Sony HCD-PX333 Checks Prior to Parts Replacement and Adjustments in MD, Specified Value

HCD-PX333

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”.

	Criteria for Determination		Measure if unsatisfactory
	(Unsatisfactory if specified value is not satisfied)
Laser power check	• 0.9 mW power		• Clean the optical pick-up
(6-2 : See page 40)	Specified value : figure1		• Adjust again
	• 8.4 mW power		• Replace the optical pick-up
	Specified value : figure2
	Iop (at 8.4mW)		• Replace the optical pick-up
	• Labeled on the optical pick-up
	Iop value ± 10mA
Traverse check	• Traverse waveform		• Replace the optical pick-up
(6-6 : See page 41)	Specified value : Below 10% offset
Focus bias check	• Error rate check		• Replace the optical pick-up
(6-7 : See page 42)	Specified value : For points A and B
	C1 error : About 200
	AD error : below 2
	For point C
	C1 error: 20
	AD error: below 2
C PLAY check	• Error rate check		• Replace the optical pick-up
(6-8 : See page 42)	Specified value:
	a.	When using test disc (MDW-74/GA-1)
		C1 error : Below 20
		AD error : 00
	b.	When using check disc (TDYS-1)
		C1 error : Below 20
Self-recording/playback	• CPLAY error rate check		If always unsatisfactory:
check	Specified value:		• Replace the overwrite head
(6-9 : See page 42)	C1 error : Below 20		• Check for disconnection of the circuits around the
	AD error : Below 2		overwrite head
			If occasionally unsatisfactory:
			• Check if the overwrite head is distorted
			• Check the mechanism around the sled
Temperature	• Unsatisfactory if displayed as T=@@ (##) [NG]”		• Check for disconnection of the circuits around
compensation	NG		D101 (BD (MD) board)
offset check	(@@, ## are both arbitrary numbers)		• Check the signals around IC101, IC151, CN102,
(6-1 : See page 40)			CN103 (BD (MD) 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.

Figure1:

SPECIFIED VALUE	KMS-262A	0.84 to 0.92 mW
	KMS-262E	0.90 to 0.96 mW
Figure2:
SPECIFIED VALUE	KMS-262A	8.1 to 8.7 mW
	KMS-262E	8.4 to 8.9 mW

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