Ic Pin Functions - Sony CDP-XE220 Service Manual

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6-8. IC PIN FUNCTIONS

• IC101 FOCUS/TRACKING/SLED SERVO RF AMP (CXA1992AR)
Pin No. Pin Name I/O
Focus error amplifier output
1 FEO
O
Connected internally to the window comparator input for bias adjustment
Focus error input
2 FEI
I
3 FDFCT Capacitor connection pin for defect time constant
I
Ground this pin through a capacitor for cutting the focus servo high-frequency gain
4
FGD I
External time constant setting pin for boosting the focus servo low-frequency
5 FLB I
6 Focus drive output
FE O O
7 Focus amplifier inverted input
FE M I
External time constant setting pin for generating focus search waveform
8 SRCH
I
External time constant setting pin for switching tracking high-frequency gain
9 TGU I
External time constant setting pin for switching tracking high-frequency gain
10 TG2
I
Peak frequency setting pin for focus and tracking phase compensation amplifier
11 FSET
I
Tracking amplifier inverted input
12 TA M I
Tracking drive output
13 TA O
O
Sled amplifier non-inverted input
14 SL P
I
Sled amplifier inverted input
15 SL M
I
Sled drive output
16 SL O
O
Connect an external capacitance to set the current which determines the Focus search,
17 ISET
I
Track jump, and Sled kick heights
Positive power supply
18
V I
CC
T E The sled overrun prevention circuit operates when this pin is Low (No pull-up resistance)
19 LOCK
L I 1 3 9 4 2 2 9 6 5 1 3
Serial data transfer clock input from CPU (No pull-up resistance)
20
CLK I
Lach input from CPU (No pull-up resistance)
21
XLT I
DATA Serial data input from CPU (No pull-up resistance)
22 I
23 Reset input; resets at Low (No pull-up resistance)
XRST I
Track number count signal output
24 C.OUT
O
Outputs FZC, DFCT1, TZC, BALH, TGH, FOH, ATSC, and others according to the com-
25 SENS1 O
mand from CPU
Outputs DFCT2, MIRR, BALL, TGL, FOL,and others according to the command from
26 SENS2
O
CPU
Focus OK comparator output
27 FOK O
Input for the defect bottom hold output with capacitance coupled
28 CC2
I
Defect bottom hold output
29 CC1
O
Connected internally to the interruption comparator input
Connection pin for defect bottom hold capacitor
30 CB
I
Connection pin for MIRR hold capacitor
31 CP
I
MIRR comparator non-inverted input
Input for the RF summing amplifier output with capacitance coupled
32 RF I
I
RF summing amplifier output
33
RF O O
Eye-pattern check point
• Abbreviation
FZC : Focus zero-cross ATSC : Anti Shock
w w w
DFCT : Defect MIRR : Mirror
TZC : Tracking zero-cross BALL : E-F Balance (Low)
BALH : E-F Balance (High) TGL : Tracking Gain (Low)
TGH : Tracking Gain (High) FOL : Focus Bias (Low)
FOH : Focus Bias (High)
Function
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Pin No. Pin Name
34 RF M
RFTC
35
36 LD
37 PD
38 PD1
39 PD2
40 FE BIAS
41 F
42 E
43 EI
44 V
EE
45 TEO
46 LPFI
47 TEI
48 ATSC
49 TZC
Q Q 50 TDFCT
3 7 6 3
VC
51
52 FZC
• Abbreviation
APC : Auto Power Control
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9 9 8
I/O Function
RF summing amplifier inverted input
I The RF amplifier gain is determined by the resistance connected between this pin and
RFO pin
I External time constant setting pin during RF level control
O APC amplifier output
I APC amplifier input
I RF I-V amplifier inverted input
I Connect these pins to the photo diode A+C and B+D pins
Bias adjustment of focus error amplifier
I
Leave this pin open for automatic adjustment
F I-V and E I-V amplifier inverted input
I
Connect these pins to photo diodes F and E
I
I-V amplifier E gain adjustment
–
(When not using automatic balance adjustment)
– Negative power supply
Tracking error amplifier output
O
E-F signal is output
Comparator input for balance adjustment
I
(Input from TEO through LPF)
I Tracking error input
I Window comparator input for ATSC detection
I Trackig zero-cross comparator input
I Capacitor connection pin for defect time constant
1 5 1 5 0 8 9 2 4
O (V + V )/2 direct voltage output
CC EE
I Focus zero-cross comparator input
m
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