Pioneer CDX-M8086ZT/E Service Manual page 42

CDX-M8086ZT ,M8086ZT-91,M8186ZT ,M8186ZT-91
QQ
3 7 63 1515 0
7 Tracking Error Offset Adjustment 2
•Purpose :
To check the offset of the tracking servo is zero and
adjust if necessary.
•Symptoms of Mal-adjustment :
Track search NG, carriage runaway.
•Measuring •DC V Meter
Equipment / Jig
•Measuring Point •TEY
•Test Disc , Mode •No disc, TEST MODE
•Adjustment Point •VR1001(TE OFFSET VR)
MAIN UNIT
TE
L 13942296513
Adjustment Procedure
1.Switch the regulator on.
2.Confirm that the DC voltage of TEY from REFO is
0±25mV.
3.If not, readjust and proceed to tracking balance ad-
justment 2.
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REFO
TEY
DC V Meter
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y
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8
8 Tracking Balance Adjustment 2
•Purpose :
To equate the sensitivity of the F channel to that of
the E channel.This needs only be done if the TE OFF-
SET volume was re-adjusted in the previous step.
•Symptoms of Mal-adjustment:
Track search NG, carriage runaway.
•Measuring
Equipment / Jig
•Measuring Point
•Test Disc , Mode
•Adjustment Point
MAIN UNIT
Q Q
3 6 7 1 3
Pull up the TOF terminal to the 5VA terminal with a 56kΩ resistor.
(This is in order to cancel lens offset in the tracking direction.)
Adjustment Procedure
1.Load disc and switch the regulator on.
2.Position the PU unit in the center of the disc using
the TRK UP and TRK DOWN keys.
3.Press key RPT to close focus and press once more to
close spindle.
4.Observing the TEY waveform on the oscilloscope,
adjust VR1002 (T.BAL) until the positive and nega-
tive halves have the same amplitude (See waveform
7–9).
5. Remove the pull-up resistor after completing
adjustment.
u163
Check
After adjustment the TEY waveform should have an
.
amplitude of 1.5±0.65 Vpp. (ABEX TCD-784 or SONY
TYPE 4)
2 9 9 4 2 8
•Oscilloscope, L.P.F.
•TEY
•ABEX TCD-784 (or SONY TYPE 4),
TEST MODE
•VR1002 (T.BAL VR)
REFO
TEY
5VA
1 5 0 5 8 2 9 9 4
56kΩ
TOF
L.P.F.
100kW
Oscilloscope
390pF
m
co
9 9
2 8 9 9