Tilt Control - Sony DVP-M35 Operation Manual

3-2-4. Tilt Control
TK-47board MB-78 board
IC006 SSI33P3720
| | CNO06 TIERR cN452
T_
TIB_ TfE
j L..__ TIOFS
0452
2SD2114
Offset voffaoe
1(;361
BA5912
TILT t
DRIVER
OSP
tC806 CDXE730R
ARP
IC805 1,10_7034
1C804 _8
$H/LGA
t ,litter
1
1
i
l TIMT÷
I TIMT-
To_ll_m
I
I
I
J
Figure. 3-12. Tilt control
(1) Tilt servo by tilt sensor
Tilt control using the tilt sensor of the optical pickup is performed at the start of DVD
playback and CD playback.
The tilt sensor output signal of the optical pickup (TK-47 board CN001, (_)P SKEW IN
(TIA), _P SKEW OUT (TIB)) is input to tilt amplifier (_), _)P) of IC006 (SS 13P3720).
After integration and amplification, it is output as the tilt error signal (TIERR _)P).
The servo on/off of the tilt error signal (TIERR) is controlled by the transistor SWQ452
of the MB-78 board.
When the tilt error signal (TIE) level drops within the specified value VCI (+2.5V) +50
mV, the window comparator output TILTIN ((_)P or (_)P) signal of IC455 (comparator
pPC393) becomes the H level, and switch Q452 is controlled to switch to the _[])P
voltage level VC (+2.5V) of IC361.
As a result, the tilt servo goes OFF to form a dead band.
The TIERR signal during ON is input to the tilt drive IC361 (BA5912AFP).
In IC361, voltage amplification, voltage conversion, and current amplification is carried
out, and the tilt motor (DC brush motor) is BTL-driven by the output signal (TIMT+(_)P,
TIMT- (_)P) of IC361.
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