Sharp CD-C1W Service Manual page 47

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 PHI Pin to connect capacitor for peak hold of RF signal.
61 BHI 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.
IC1 VHiLA9241M/-1:Servo Amp., (LA9241M) (2/2)
LDS
VCC1
64
1
FIN2
FIN1 2
I/V
3
E
4
F
5
TB
TE- 6
7
TE
8
TESI
9
SCI
T.SERVO & T.LOGIC
10
TH
11
TA
12
TD-
13
TD
14
JP
15
TO
FD 16
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LDD BHI PHI
63 62 61 60
APC
RF DET
VCA
BAL VCA
TE
F.SERVO & F.LOGIC
17 18 19
FD- FA FA-
Figure 47 BLOCK DIAGRAM OF IC
Function
DRF
LF2 VR REFI VCC2
FSS
59 58 57 56 55 54
REF
µ-COM
INTER FACE
SPINDLE SERVO
20 21 22 23 24 25 26 27
FE FE- SP SPI SPG SP- SPO
AGND
– 47 –
CD-C1W,CP-C1W
DAT
CL
CE CLK DEF
53 52 51 50 49
48 NC
47 TBC
46
FSC
45
DGND
SLC
44
SLI
43 SLC
42 RFS-
41 RFSM
RF AMP
40 CV+
39 CV-
38 SLOF
37 HFL
36 TES
35 TOFF
34 TGL
33 JP+
SLED SERVO
28 29 30 31 32
SLEO SLD SL- SL+ JP-