JVC PC-X250 Service Manual page 22

PC-X250
Pin
Symbol
No.
1 FIN2 Pickup photodiode connection pin. Added to FIN1 pin to generate the RF signal, subtracted from FIN1 pin to generate
the FE signal.
2 FIN1 Pickup photodiode connection pin.
3 E Pickup photodiode connection pin. Subtracted from F pin to generate the TE signal.
4 F Pickup photodiode connection pin.
5 TB TE signal DC component input pin.
?
6 TE Pin which connects the TE signal gain setting resistor between this pin and TE pin.
7 TE TE signal output pin.
8 TESI TES (Track Error Sense) comparator input pin. The TE signal is input through a bandpass filter.
9 SCI Shock detection input pin.
10 TH Tracking gain time constant setting pin.
11 TA TA amplifier output pin.
?
12 TD Pin for configuring the tracking phase compensation constant between the TD and VR pins.
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 FD Focusing control signal output pin.
?
17 FD Pin for configuring the focusing phase compensation constant between the FD and FA pins.
18 FA Pin for configuring the focusing phase compensation constant between the FD
?
19 FA Pin for configuring the focusing phase compensation constant between the FA and FE pins.
20 FE FE signal output pin.
?
21 FE Pin which connects the FE signal gain setting resistor between this pin and FE pin.
22 AGND Analog signal GND.
23 NC No connection
24 SP CV
25 SPG 12-cm spindle mode gain setting resistor connection pin.
?
26 SP Spindle phase compensation constant connection pin, along with the SPD pin.
27 SPD Spindle control signal output pin.
28 SLEQ Sled phase compensation constant connection pin.
29 SLD Sled control signal output pin.
?
30 SL Input pin for sled movement signal from microprocessor.
+
31 SL Input pin for sled movement signal from microprocessor.
?
32 JP Input pin for tracking jump signal from DSP.
+
33 JP Input pin for tracking jump signal from DSP.
34 TGL Input pin for tracking gain control signal from DSP. Gain is low when TGL is high.
35 TOFF Input pin for tracking off control signal from DSP. Tracking servo is off when TOFF is high.
36 TES Output pin for TES signal to DSP.
37 HFL The High Frequency Level is used to determine whether the main beam is positioned over a bit or over the mirrored
surface.
38 SLOF Sled servo off control input pin
?
39 CV Input pin for CLV error signal from DSP.
+
40 CV Input pin for CLV error signal from DSP.
41 RFSM RF output pin.
?
42 RFS RF gain setting and EFM signal 3T compensation constant setting pin, along with the RFSM pin.
43 SLC Slice Level Control is an output pin that controls the data slice level used by the DSP for the RF waveform.
44 SLI Input pin used by DSP for controlling the data slice level.
45 DGND Digital system GND pin.
46 FSC Focus search smoothing capacitor output pin.
47 TBC Tracking Balance Control; EF balance adjustment variable range setting pin
48 NC No connection
49 DEF Disc defect detection output pin.
50 CLK Reference clock input pin. 4.23 MHz signal from the DSP is input.
51 CL Microprocessor command clock input pin.
Pin
Symbol
No.
52 DAT Microprocessor command data input pin.
53 CE Microprocessor command chip enable input pin.
54 DRF RF level detection output (Detect RF).
55 FSS Focus Search Select; focus search mode (± search/+search vs. the reference voltage) switching pin
56
V 2 Servo system and digital system V
CC
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 V 1 RF system V
CC
1 - 22
LA9241 Pin Functions
+ ?
and CV pins input signal single-end output.
pin.
CC
Contents
Contents
pin.
CC
? ?
and FA pins.