Sharp CD-PC672, Service Manual

Page: 45 / 67

CD-PC672
– 48 –
IC1 VHiLA9241M/-1:Servo Amp.(LA9241M) (2/2)
Pin No. Port Name
Function
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 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.
Figure 48 BLOCK DIAGRAM OF IC
1 FIN2
FIN1
E
F
TB
TE-
TE
TESI
SCI
TH
TA
TD-
TD
JP
TO
FD
FD- FA FA-
FE FE- AGND SP SPI SPG SP- SPD SLEQ SLD SL- SL+ JP-
JP+
TGL
TOFF
TES
HFL
SLOF
CV-
CV+
RFSM
RFS-
SLC
SLI
DGND
FSC
TBC
NC
DEF CLK CL DAT CE DRF FSS VCC2 REFI VR LP2 PH1 BH1 LDD LDS
SLC
RF AMP
TE
F.SERVO & F.LOGIC SPINDLE SERVO SLED SERVO
VCC1
2
3
4
6
7
5
8
9
10
11
12
13
14
15
16
17 18 19 20 21 23 22 25 26 27 28 29 30 31 32
33
34
35
36
37
38
39
40
41
42
43
44
46
47
48
49 50 51 52 53 54 55 56 57 58 59 61 60 62 63 64
45
24
APC
RF DET
REF
VCA
VCA
INTER FACE
BAL
µ
-COM
I/V
T.SERVO & T.LOGIC
NC