Sanyo CWM-240 Service Manual page 12

IC BLOCK DIAGRAM & DESCRIPTION
IC901 LA9250M (Analog Signal Processor)
No. Pin Name Function
Pick-up photo-diode connection pin. Added to FTN! Pin to generate the
1 FTN2
RF signal, subtracted from FTN1 pin to generate the FE signal.
2 FTN1
Pick-up photo-diode connection pin.
Pick-up photo-diode connection pin. Subtracted from F pin to generate
3 E
the TE signal.
4 F
Pick-up photo-diode connection pin.
5 TB
TE signal DC component input pin.
PIN which connect the TE signal gain setting resistor between this pin
6 TE-
and TE pin.
7 TE
TE signal output pin.
TES(Track Error Sense)comparator input pin. The TE signal is input
8 TSEI
thorough a band-pass filter.
9 SCI
Shock detection input pin.
10 TH
Tracking gain time constant setting pin.
11 TA
TA amplifier output pin.
Pin for configuring the tracking phase compensation constant between
12 TD-
the TD and VR pin.
13 TD
Tracking phase compensation setting pin.
14 JP
Tracking jump signal(kick pulse)amplitude setting pin.
15 TO
Tracking control signal output pin.
16 NC
No connection
17 FD
Focusing control signal output pin.
18 FD-
Pin for configuring the focusing phase between the FD and FA pins.
Pin for configuring the focusing phase compensation constant the FD-
19 FA
and FA- pins.
Pin for configuring the focusing phase compensation constant between
20 FA-
the FAS and FE pins.
21 FE
FE signal output pin.
Pin which connects the FE signal setting resistor between this pin and
22 FE-
FE pin.
23 SP
Inverted output of CLV pin signal.
24 SPG
12-cm spindle mode gain setting resistor connection pin.
25 SP-
Spindle phase compensation constant pin, along with SPD pin.
26 SPD
Spindle control signal output pin.
27 SLEQ
Sled phase compensation constant connection pin.
28 SLD
Sled control signal output pin.
29 SL-
Input pin for sled movement signal from microprocessor.
30 SL+
Input pin for sled movement signal from microprocessor.
31 OSC
Pin for setting oscillating frequency.
32 NC
No connection.
No. PIN NAME
33 SLOF Sled servo off control input pin.
Pin for setting the function on/off, which function is tracking gain
34 TGRF
following to RF level.
35 SP8 Switch control pin for spindle 8cm/12cm mode.
36 EFBAL E/F balance control signal input.
37 FSTA Focus search control signal input.
38 LASER Laser on/off control input.
39 NC No connection.
40 TJP Input pin for tracking jump signal from DSP.
Input pin for tracking gain control signal from DSP. Gain is low when
41 TGL
TGL is high.
Input pin for tracking off control signal from DSP. Tracking servo is off
42 TOFF
when TOFF is high.
43 TES Output pin for TES signal to DSP.
The High Frequency Level is used to determine whether the main beam
44 HFL
is positioned over a pit or over the mirrored surface.
45 CLV Input pin for CLV error signal from DSP.
46 GND GND
47 RF RF output pin.
RF gain setting and EFM signal 3T compensation constant setting pin,
48 RF-
along with the RF pin.
Slice Level Control is an output pin that control the date slice level used
49 SLC
by the DSP for the RF wave-form.
50 SLI Input pin used by DSP for controlling the date slice level.
51 DEF Disc defect detection output pin.
52 DRF RF level detection output(Detect RF)
53 FSC Focus search smoothing capacitor output pin.
Tracking Balance Control; E/F balance adjustment variable range
54 TBC
setting pin.
Focus Search Select; focus search mode(+-search / + search vs. the
55 FSS
reference voltage) switching pin.
56 VCC VCC
57 REFI By-pass capacitor connection pin for reference voltage.
58 VR Reference voltage output pin.
59 LF2 Disc defect detection time constant setting pin.
60 PH1 RF signal peak hold capacitor connection pin.
61 BH1 RF signal bottom hold capacitor connection pin.
62 LDD APC circuit output pin.
63 LDS APC circuit input pin.
64 NC No connection.
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Function