Pioneer DV-515 Service Manual page 4

DV-515
1.2.2 Focus Servo
FE generated in the RF IC is sent to the Digital servo IC.
Both DVD and CD, the servo is turned on during the transition
from "Upmost" to "Down" of the first-order sine wave with 650
nm LD ON (LD 1 ON = H). For a CD, it turns on during the transition
from "Down" to "Up" of the first-order sine wave with 780 nm LD
ON (LD 2 ON = H).
• FOCUS SERVO
PICKUP
OEIC
FOCUS
COIL
• FOCUS LOCK TIMING
4
19 20
RF
3
B1
11
IC101
B3
RFIC
B2
LA9701M
12
B4
15 16 17 18 32
LD1
MD1
LD2
MD2
13
IC352
DRIVER
14
FOCUS IN with 780nm LD
(Actually it is only at CD.)
LDON
UP
FDO
FE
The kick-brake pulses, such as those for FOCUS jump, are also
output from pin 47 (FDO) of IC201.
LD1 ON
LD2 ON
OEIC GAIN
PH
57 30
IC201
FE
ADDRESS
42 33
DIGITAL
SERVO IC
BUS
LC78651W
SGC
42
47
FDO
3
FOCUS IN with 650nm LD
UP
54 58 57
IC501
MECH.
&
CONTROL
PE5012A