Sharp CDC2900 Service Manual - Page 47

Function Table Of Ic

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CD-C622/C2900 FUNCTION TABLE OF IC IC1 VHiLA9241M/-1: Servo Amp. (LA9241M) (1/2) Pin No. 1 2 3 4 5 6 7 8 9 10 11* 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48* 49 50 Port Name FIN2 FIN1 E F TB TETE TESI SCI TH TA TDTD JP TO FD FDFA FAFE FEAGND NC SPI SPG SPSPD SLEQ SLD SLSL+ JPJP+ TGL TOFF TES HFL SLOF CVCV+ RFSM RFSSLC SLI DGND FSC TBC NC DEF CLK Function Connection pin for photodiode of pickup. RF signal is generated through addition with FIN pin, and FE signal is generated through subtraction. Connection pin for photodiode of pickup. Connection pin for photodiode of pickup. TE signal is generated through subtraction with F pin. Connection pin for photodiode of pickup. Pin for input of DC component of TE signal. Pin to connect gain setting resistor of TE signal to TE signal. TE signal output pin. TES (Track error sense) comparator input pin. TE signal is band-passed and input. Input pin for shock detection. Pin to set time constant of tracking gain. TA amplifier output pin. Pin to compose tracking phase compensation constant between TD and VR pins. Pin to set tracking phase compensation. Pin to set amplitude of tracking jump signal (kick pulse). Tracking control signal output pin. Focusing control signal output pin. Pin to compose focusing phase compensation constant between FD and FA pins. Pin to compose focusing phase compensation constant between FD-/FA-pins. Pin to compose focusing phase compensation constant between FA and FE pins. Output pin of FE signal. Pin to connect gain setting resistor of FE signal across TE pin. GND for analog signal. No connect. Spindle amplifier input. Pin to connect gain setting resistor in the 12cm mode of spindle. Pin to connect spindle phase compensation constant together with SPD pin. Spindle control signal output pin. Pin to connect thread phase compensation constant. Thread control signal output pin. Input pin of thread feed signal from micro computer. Input pin of thread feed signal from micro computer. Input pin of tracking jump signal from DSP. Input pin of tracking jump signal from DSP. Input pin of tracking gain control signal from DSP. TGL = Gain low at "H" Input pin of tracking off control signal from DSP. TOFF = Off at "H" Output pin of TES signal to DSP. (HIGH FREQUENCY LEVEL) is used to judge whether main beam is positioned on the bit or on the mirror. Thread servo off control input pin. Pin to input CLV error signal from DSP. Pin to input CLV error signal from DSP. RF output pin. Pin to set gain of RF and set 3T compensation constant together with RFSM pin. (SLICE LEVEL CONTROL) is the output pin to control of the level of the data slice with RF waveform DSP. Input pin to control the level of data slice with DSP. GND pin in the digital system. Output pin for focus search smoothening capacitor. (Tracking Balance Control) Pin to set EF balance variable range. No connect. Defect detection output pin of disk. Reference clock input pin. 4.23MHz of DSP is input. In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside. - 47 -

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– 47 –
CD-C622/C2900
FUNCTION TABLE OF IC
IC1 VHiLA9241M/-1: Servo Amp. (LA9241M) (1/2)
1
FIN2
Connection pin for photodiode of pickup.
RF signal is generated through addition with FIN pin, and FE signal is generated through subtraction.
2
FIN1
Connection pin for photodiode of pickup.
3
E
Connection pin for photodiode of pickup. TE signal is generated through subtraction with F pin.
4
F
Connection pin for photodiode of pickup.
5
TB
Pin for input of DC component of TE signal.
6
TE-
Pin to connect gain setting resistor of TE signal to TE signal.
7
TE
TE signal output pin.
8
TESI
TES (Track error sense) comparator input pin. TE signal is band-passed and input.
9
SCI
Input pin for shock detection.
10
TH
Pin to set time constant of tracking gain.
11*
TA
TA amplifier output pin.
12
TD-
Pin to compose tracking phase compensation constant between TD and VR pins.
13
TD
Pin to set tracking phase compensation.
14
JP
Pin to set amplitude of tracking jump signal (kick pulse).
15
TO
Tracking control signal output pin.
16
FD
Focusing control signal output pin.
17
FD-
Pin to compose focusing phase compensation constant between FD and FA pins.
18
FA
Pin to compose focusing phase compensation constant between FD-/FA-pins.
19
FA-
Pin to compose focusing phase compensation constant between FA and FE pins.
20
FE
Output pin of FE signal.
21
FE-
Pin to connect gain setting resistor of FE signal across TE pin.
22
AGND
GND for analog signal.
23
NC
No connect.
24
SPI
Spindle amplifier input.
25
SPG
Pin to connect gain setting resistor in the 12cm mode of spindle.
26
SP-
Pin to connect spindle phase compensation constant together with SPD pin.
27
SPD
Spindle control signal output pin.
28
SLEQ
Pin to connect thread phase compensation constant.
29
SLD
Thread control signal output pin.
30
SL-
Input pin of thread feed signal from micro computer.
31
SL+
Input pin of thread feed signal from micro computer.
32
JP-
Input pin of tracking jump signal from DSP.
33
JP+
Input pin of tracking jump signal from DSP.
34
TGL
Input pin of tracking gain control signal from DSP. TGL = Gain low at "H"
35
TOFF
Input pin of tracking off control signal from DSP. TOFF = Off at "H"
36
TES
Output pin of TES signal to DSP.
37
HFL
(HIGH FREQUENCY LEVEL) is used to judge whether main beam is positioned on the bit or on the mirror.
38
SLOF
Thread servo off control input pin.
39
CV-
Pin to input CLV error signal from DSP.
40
CV+
Pin to input CLV error signal from DSP.
41
RFSM
RF output pin.
42
RFS-
Pin to set gain of RF and set 3T compensation constant together with RFSM pin.
43
SLC
(SLICE LEVEL CONTROL) is the output pin to control of the level of the data slice with RF waveform DSP.
44
SLI
Input pin to control the level of data slice with DSP.
45
DGND
GND pin in the digital system.
46
FSC
Output pin for focus search smoothening capacitor.
47
TBC
(Tracking Balance Control)
Pin to set EF balance variable range.
48*
NC
No connect.
49
DEF
Defect detection output pin of disk.
50
CLK
Reference clock input pin. 4.23MHz of DSP is input.
Pin No.
Port Name
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.