DM-3090(K) COVER 97.11.29 0:19 AM y[W 25
DM-3090
ADJUSTMENT
M echanism Adjustm ent
1
1. O ptical pickup grating inspecting m ethod
3
2
OSILLOSCOPE42 pin of IC 1101a
GND (TP1131)
100K
26 pin of IC 1101
EOUT (TP1133)470p
GND CH1 CH2
470pb
XY25 pin of IC 1101Spindle M otor
FOUT (TP1132)100K
LISSAJOUS'S W AVEFORM
Less thana:b = 3:1
Figure 23-1 O ptical Pickup G rating Deviation
M easuring M ethod
After the autom atic adjustm ent is perform ed in the AUTO
m ode (test m ode) with the aid of high refection M D disc
("CO M PLATE" is displayed), the Lissajous's waveform (x-y) isAdjusting hole
adjusted.
3
1. Slightly loosen the 3 screws of spindle m oto, and m aken an
Spindle m otor
adjustm ent, observing the Lissajous's waveform .
2. After adjustm ent tighten the screw in arder of 1 , 2 , 3 .1
Check the Lissajou's waveform ,
shifting the m ounting position with
a screwdriver (to be fitted into the
adjustingdisc m otor adjusting hole).2. Jitter adjustm ent and checking m ethod
hole
2jitter M eter
Figure 23-2
1pin of IC 1201 (TP1274)
EFM M ON
88 pin of IC 1201 (TP1275)
GND
Figure 23-3 Jitter connection diagram
After perform ing autom atic adjustm ent in AUTO m ode of
TEST m ode using the low reflection M D disc, check this jitter
in pit continuous playback and groove continuous playback
m ode.
2P extension connectorFrom M agnetic Head
5P extension flat cable
CNP1252
From
m otor
From OpticalFrom m echa-
nism switch
Pickup Unit
CNP1601(Bottom side)PW B
CNP1602
CNP1603
CNP1101
CNP1604(Bottom side)
28Pextension flat cable
M D M ain PW BExtension PW B for service
Fit the extension PW B for service to the m echanism
6P-2P extension connector
Figure 23-4
30 |
ACEC
