Sharp CD-PC1881V Service Manual page 45

IC1 VHiLA9241M/-1:Servo Amp.(LA9241M) (2/2)
Pin No. Port Name
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 REF1 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 LDO APC circuit output pin.
63 LDS APC circuit output pin.
64 VCC1 RF system VCC pin.
VCC1 LDS
64 63
APC
1
FIN2
FIN1 2
I/V
E 3
F
4
TB 5
6
TE-
7
TE
TESI 8
SCI
9
T.SERVO & T.LOGIC
TH
10
TA
11
TD-
12
TD
13
JP 14
TO
15
FD 16
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LDO BHI
PHI
62 61 60
RF DET
VCA
BAL VCA
TE
F.SERVO & F.LOGIC
17 18 19
FA FA-
FD-
Figure 45 BLOCK DIAGRAM OF IC
Function
LF2 VR REF1 VCC2 FSS DRF
59 58 57 56 55
REF
µ-COM
INTER FACE
SPINDLE SERVO
AGND
20 21
22 23 24 25 26 27
SPO SLEO
FE FE- SP SPI SPG SP-
– 45 –
CD-PC1881V
CE DAT CL CLK
DEF
54 52 50
53 51 49
48
47
46
45
SLC
44
43
42
41
RF AMP
40
39
38
37
36
35
34
33
SLED SERVO
30 31
28 29 32
SLO SL- SL+ JP-
NC
TBC
FSC
DGND
SLI
SLC
RFS-
RFSM
CV+
CV-
SLOF
HFL
TES
TOFF
TGL
JP+