Pioneer CDX-M8086ZT/E Service Manual page 38

CDX-M8086ZT ,M8086ZT-91,M8186ZT ,M8186ZT-91
QQ
3 7 63 1515 0
3 Grating Adjustment 2
•Purpose :
This needs to be done if the grating adjustment 1 is
unsuccessful.
•Symptoms of Mal-adjustment :
Unable to play disc, track skipping, track search NG.
•Measuring •Oscilloscope, Grating
Equipment / Jig Adjustment filter (B.P.F.), mV
Meter, Two L.P.F., Clock Driver
•Measuring Point •TEY, E, F
•Test Disc , Mode •ABEX TCD-784 (or SONY TYPE 4),
TEST MODE
•Adjustment Point •Grating hole
IN
REFO
MAIN UNIT
TE
L 13942296513
F
REFO
E
TEY
REFO
Adjustment Procedure
1.Load disc and switch 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.While observing the TEY filter output using an
ACmV meter, use a screwdriver to slowly turn the
grating hole.
The AC level, should become larger or smaller by
turning the grating hole, try to find the minimum lev-
el point. www
(This is where the grating is in line on track, and is
the "null point".)
5.Turn the screwdriver clockwise from the null point
.
(from the PU under side), so that the lissajous is in
line as much as possible.
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B.P.F.
+
100kW OUT
+
–
– 51kW
56pF
51kW
220pF
E
27kW
110pF 110pF
L.P.F.
100kW
X Oscilloscope
Y
390pF
L.P.F.
100kW
390pF
+5V
IN OUT
mV Meter
B.P.F.
REFO E
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2 9
8
Lissajous figure (AC input)
Horizontal axis E 10mV/div.
Null Point=180°
Vertical axis F 10mV/div.
"Rough" adjustment=90°
Q Q
3 6 7 1 3 1 5
Final adjustment=0°
co
.
9 4 2 8
Waveform 4
0 5 8 2 9 9 4 2 8
Waveform 5
m
Waveform 6
9 9
9 9