Pioneer XR-P740M, XR-P64M, XR-P340M xR-P7 &, XR-P64, XR-P34, FocusOffset Verilication, YEDS7

XR-P740M, XR-P64()M, XR-P340M xR-P7 &, XR-P64(), XR-P34()

I FocusOffset Verilication

. Objective Verify the DC offset for the focuserror amp.

aSymptomwhenout The modeldoesnot focusin andthe RF sigaalis dirty. of adjustment

a Measurement	Connectthe oscilloscopeto	a	Player State	Test mode, stopped
Instrument	TPl, Pin6(FOER)			(just the Power switch on)
Connections
	[Settings] SmVldivision	a	Adjustment Location	None
	l0ms7/division
	DC mode	a	Disc	None needed

IProcedurel

Verify the DC voltageat TPl, Pin6FOER) is 0tsOmV.

Note: If the specified values cannot be obtained or no adjustment is possible by pertorming the veifications or adjustments described in adjustment items 1-4, the pickup block may be defective.

I TrackingErrorBalanceVerification

. Objective To verify that there is no variation in the sensitivity of the tracking photo diode.

aSymptomwhen out Play does not start or track searchis impossible. of adjustment

a Measurement	Connect the oscilloscope to		a PlayerState	Test mode, focus and spindle
Instrument	TPl,	Pin2 (TRER). This		servos closed and tracking	servo
Connections	connection may be Yia a low			open.
	passfilter.
			a Adjustment Location	None
	[Settings] 50mV7/division		a Disc	YEDS_7
		5ms7/division
		DC mode
lProcedurel
1. Movethe pickupto midwayacrossthe disc(R:35mm) with the MANUALz/TRACK SEARCHFWD >>.					>>l
key or REV i{<1	. <l{	key.

2.Pressthe DOLBYNR key,thenthe PLAY7/PAUSEFutl key in thatorderto closethefocusservothenthespindle serYo.

3.Line up thebright line (ground)at the centerof the oscilloscopescreenandput the oscilloscopeinto DC mode,

4.Supposingthatthepositiveamplitudeof thetrackiqgerrorsignalat TP1,pin2(TRER)is (A)andthenegatiyeamplitude is (B). the following expressionis satisfied.

When

When

o = t , + ' ] = o . r

A . B , ? ' ] s o . r

When lhsrg is a DC compon€nt

Whon thero is no DC componenr