Pioneer CDX-M8086ZT/E Service Manual page 39

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4 Tracking Balance Adjustment 1
•Purpose :
To equate the sensitivity of the F channel to that of
the E channel.
•Symptoms of Mal-adjustment :
Track search NG, poor playability carriage runaway.
•Measuring
Equipment / Jig
•Measuring Point
•Test Disc , Mode
•Adjustment Point
MAIN UNIT
TE
L 13942296513
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 negative
halves have the same amplitude (see waveform
7–9).
Check
www
After adjustment the TEY waveform should have an
amplitude of 1.5±0.65 Vpp (ABEX TCD-784 or SONY
TYPE 4)
.
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CDX-M8086ZT ,M8086ZT-91,M8186ZT ,M8186ZT-91
•Oscilloscope, L.P.F.
•TEY
•ABEX TCD-784 (or SONY TYPE 4),
TEST MODE
•VR1002 (T.BAL VR)
REFO
TEY
5VA
56kΩ
TOF
L.P.F.
100kW
Oscilloscope
390pF
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2 9
8
+5% NG
t
REFO
±0% OK
Q Q
3 6 7 1 3 1 5
t
REFO
–5% NG
t
REFO
co
.
9 4 2 8
DC Mode
0.5V/div.
5ms/div.
Waveform 7
0 5 8 2 9 9 4 2 8
Waveform 8
m
Waveform 9
9 9
9 9
39