Sharp CD-C492 Service Manual page 62

CD-C492/492C
IC1 VHiLA9241M/-1: Servo Amp. (LA9241M) (2/2)
Port Name
Pin No.
51 CL Micro computer command clock input pin.
52 DAT Micro computer command data input pin.
53 CE Micro computer command chip enable input pin.
54 DRF (DETECT RF) RF level detection output.
55 FSS (Focus Serch Select) Pin to switch focus search mode. (± search/+ search for reference voltage)
56 VCC2 VCC pin for servo system and digital system.
57 REFI Pin to connect pass control for reference voltage.
58 VR Reference voltage output pin.
59 LF2 Pin to set defect detection time constant of disk.
60 PH1 Pin to connect capacitor for peak hold of RF signal.
61 BH1 Pin to connect capacitor for bottom hold of RF signal.
62 LDD APC circuit output pin.
63 LDS APC circuit output pin.
64 VCC1 RF system VCC pin.
VCC1 LDS
64 63
FIN2 1
FIN1 2
I/V
E 3
F 4
5
TB
6
TE-
7
TE
8
TESI
9
SCI
T.SERVO & T.LOGIC
10
TH
11
TA
12
TD-
13
TD
14
JP
15
TO
16
FD
LDD BH1 PH1
62 61 60
APC
RF DET
VCA
BAL VCA
TE
F.SERVO & F.LOGIC
17 18 19
FD-
FA FA-
Figure 62 BLOCK DIAGRAM OF IC
Function
LP2 VR REFI VCC2 FSS
59 58 57 56 55
REF
µ-COM
INTER FACE
SPINDLE SERVO
20 21 22 23 24 25 26
FE FE- AGND SP SPI SPG SP- SPD
NC
– 62 –
DRF CE DAT CL CLK DEF
54 53 52 51 50 49
48
47
46
45
SLC
44
43
42
41
RF AMP
40
39
38
37
36
35
34
33
SLED SERVO
27 28 29 30 31 32
SLEQ SLD SL- SL+ JP-
NC
TBC
FSC
DGND
SLI
SLC
RFS-
RFSM
CV+
CV-
SLOF
HFL
TES
TOFF
TGL
JP+