SAMSUNG max632 Special Circuit Descriptions
5. Special Circuit Descriptions
5-1 CD
5-1-1 RF Amp (KA9220) : WIC01
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58K |
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75 |
R1 |
RF SUMMING |
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B |
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10K |
V1 AMP |
RFO |
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66 |
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A |
C |
PD1 |
RF I-V AMP(1) |
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D |
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PD2 |
58K |
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R3 |
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Photo Detector |
74 |
10K |
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67 |
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R2 |
V2 |
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RF |
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RF I-V AMP(2) |
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RF I-V Amp(I-1) and RF I-V Amp (I-2) are converted to voltage (via internal resistance of 58k½) from the current of PD1 (A+C) and PD2 (B+D):
These voltages are added by the RF summing amplifier. The signal (A+B+C+D) is applied to RFO (No.2 terminal) RF output voltage is calculated as follows :
VRF = -R3 x (iPD1 + iPD2)
= -R3 x (V1/R1 + V2/R2)
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V1 |
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V2 |
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10K |
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10K |
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R3 |
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x (V1 + V2) |
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10K |
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5-1-2 Focus Error Amp (KA9220) : WIC01
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R2 |
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174K |
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C1 25P |
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R1 |
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FE |
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V1 32K |
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-(B+D) |
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57 |
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-(A+C) |
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FOCUS |
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32K |
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ERROR |
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164K |
AMP |
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C2 25P |
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63 |
FE Bias |
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Vcc |
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GND |
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20K |
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FOCUS ERROR Amp AMPLIFIES the difference
between RF I-V Amp (1) output (A+C) and RF I-V Amp (2) output (B+D) These two signals are supplied to (-) and (+) input terminals of the FOCUS ERROR Amp. The FOCUS ERROR signal resulting from this difference voltage is applied to FE (Terminal No. 57).
The FE output voltage of this low frequency component varies according to {(A+C) - (B+D)}.
VFE is calculated as follows: VFE=(R2/R1) X (V2-V1) = 5.4(V2-V1)
This FOCUS ERROR voltage is sent to FOCUS SERVO.
5-1-3 Focus Servo System (KA9220) : WIC01
When FS3 is ON, high-frequency gain decreases (time constant is set by pin17, pin19, and capacitor connected to internal resistance). The capacitor between pin18 and GND sets the time constant to pass low freqencies in PLAY mode.
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3.6K |
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60K |
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FZC |
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FE1 |
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FE2 |
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FSEO |
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20K |
20K |
48K |
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92K |
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58 |
PHASE |
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48 |
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0.0022 |
470K |
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FS4 |
COMPENSATION |
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120K |
FOCUS |
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60 |
DFCT |
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40K |
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47 |
COIL |
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0.1UF |
FDFCT |
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130K |
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5.5U 11U |
FCE |
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62 |
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FS2 |
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10K |
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ISET |
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0.1UF |
HFGD |
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50K |
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470K |
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20 |
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61 EFR |
46K |
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180K |
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580K |
FS3 |
40K |
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FS1 |
21 |
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VREG |
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FSW 27 |
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PFSET |
3 |
FSCH |
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0.1UF |
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4.7UF |
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The maximum frequency of focus phase compensation is inversely proportional to the resistance connected to pin 7. Focus search peak is about 1.1 Vp-p, and is inversely proportional to the resistance connected to pins 22,23
(if this resistance changes, the peak of track jump and sled kick change). The inversion input of FZC comparator is set to 5.7% of the difference between Vcc and VC (pin69) {(5.7% x (Vcc-Vc)}.
Note : If the resistance connected to pin 7 changes, the phase compensation peak of focus,tracking,sled servos change. At the same time, ‘op-amp’ dynamic range and offset voltage also change.
Samsung Electronics |
5-1 |
Special Circuit Descriptions
5-1-4 Tracking Sled Servo System (KA9220) : WIC01
The capacitor between pins 15 and 16 attenuates high frequencies when TG2 is off. The maximum frequency of tracking phase compensation is inversely proportional to the resistance connected to pin 7 (about 1.2kHz at 470k). The tracking jump (FWD and REV) is determined when TM3 and TM4 are ON, and the peak voltage induced from tracking coil is decided by both TM3 and TM4 current values and feedback resistance of pin 47.
Tracking jump max voltage = TM3 (TM4) current x feedback reisistance.
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180K |
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22 |
23 |
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ISET |
VREG |
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0.022UF |
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TZC |
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51 |
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100K |
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TZC |
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100K |
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S STOP |
8 |
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100K |
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S STOP |
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0.047UF |
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1K |
1K |
SLED |
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40 |
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50 |
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BPF |
ATS |
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56K SLED |
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ATC |
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1K |
TM6 |
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SLEI |
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150K |
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41 |
DRIVER |
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TE 1 |
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52 |
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100K |
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SLEN |
39 |
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20K |
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TM5 |
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10K |
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TE2 |
470K |
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680K |
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54 |
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5.5U |
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DFCT |
TM4 |
TM2 |
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0.1UF |
TDFC1 |
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120K |
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66PF |
TM3 |
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TKEI |
47 |
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10K |
5.5U |
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100K |
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PHASE |
TKEO 48 |
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COMPENSATION |
10K |
90K |
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20K |
110K |
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TRACKING |
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16 |
RTG |
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TM7 |
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COIL |
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0.1UF |
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82K |
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TGSW |
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15 |
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470K |
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TG2 |
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PFSET |
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7 |
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470K |
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FWD or REV sled kick occurs when TM5 or TM6 is ON, and the peak voltage added to sled motor is decided by TM5 or TM6 current and the feedbadk resistance of pin 41.
Sled jump max voltage= TM5 (TM6) current x feedback resistance
Each SW current is decided by the resistance connected to pin 22 and 23. When the resistance is about 150½,
TM3 or TM4 = 11µA, TM5 or TM6 = 22µA,
This current is inversely proportional to the resistor, variable within a range of 5 to 40µA for TM3. STOP is the ON/OFF detection signal for the limit SW (or the sled motor’s innermost cirumference).
5-2 |
Samsung Electronics |
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