Service Information
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OMS.1/1A/1E |
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Nakamichi |
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(Compact Disc Player) |
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from |
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Serial No. |
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No. 00D - s1 - 3110 (1/36) |
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Subject |
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Principle of Operation |
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Date 31 May 1988 |
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CONTENTS |
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1. |
Introduction |
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1 |
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2. Power Supply Circuit |
••.................. |
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•... |
••............................... |
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3 |
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3. |
Control System • |
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•.•..•..• |
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4. |
Reset Circuit .•.................. |
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••••............ |
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•.. |
••.•.................... |
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6 |
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5. |
Eject/Load Operations ................ |
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••.... |
•...................... |
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6 |
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(1) |
Eject Operation |
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(2) |
Load Operation |
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6. |
Auto Power Control |
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7. |
Focus Servo System |
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9 |
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8. |
Tracking Servo System . . . . . . . . |
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12 |
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9. |
Feed Servo System |
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14 |
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10. |
Track Jump System |
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15 |
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11. |
CLV (Constant Linear Velocity) Servo System ......................................... |
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18 |
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(1) |
EFM Auto Slice Circuit . . . . . . |
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20 |
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·(2) |
PLL Circuit . . . |
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21 |
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(3) |
CLV Servo Circuit ................................. |
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: ...................... |
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22 |
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12. |
Signal System . . . . |
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(1) |
Frame Sync. Detector and EFM Demodulator ...................................... |
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(2) |
Subcode Demodulation . . . . . . |
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24 |
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(3) |
RAM Interface (External RAM Address Generation) . |
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(4) |
Error Correction . |
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(5) |
Playback Flag Determination and Interpolation |
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(6) |
Digital Filter and DAC (D/A Converter) Interface .................................... |
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(7) |
DEMO (Pin 24 of IC141) Signal |
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29 |
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(8) |
D/A Converter and Following Circuits ........................................... |
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30 |
1.Introduction
Fig. 1 shows the block diagram of the OMS·1, and Fig. 2 shows its timing chart. Though being Nakamichi low-cost version CD player, the OMS·1 incorporates a variety of technology developed for Nakamichi'shigh-grade models and demonstrates high-grade sound quality.
The OMS-1 employs a 3-beam laser pickup. In circuit construction, third-generation LSls particularly developed for CD players, 2-times oversampling digital filter, up-to- date D/A (digital-to-analog) converter technology, and 5th-order active low-pass filter are employed. In mechanism, the floating disc drive with precision
centering is adopted for protection against disturbance.
Using the Remote Control Unit attached to the OMS-1 enables F. Fwd. and Rev. operation which cannot be executed on the OMS-1 itself.
G-880505A Printed in Japan
OMS-1/1A/1 E OOD-Sl-3110 (2/36)
Loser P1ckup
IC 101
+~V -~.~V
t t
~!ii~._·_··_·_·..__..._·_,F'"=a:
Conuot Switch
IC402
MPll Remote |
RM60t Romote |
Control Ooco<ler |
Conttol Rocei•tr |
2-1.rne ovo ..omptinQ
DiQitol filter
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IC302 |
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______ JI |
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~th Ord« |
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1C311,312 |
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A<!<'e L.P.F. |
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IC313 |
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""l |
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OACL~ |
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D•QlitoMr |
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SMP 3 |
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Sompl•8 Hol<I |
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Of Ou1 |
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Oe;!i\chor |
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.>--!-..-{<>}:~~Ju1pu1 |
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IC311,312 |
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Somp\e8 Hold |
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5MP I |
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SMP 2 |
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+12v |
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...-IOV |
Re'"\ |
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to MPV 6i IC141 |
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Fig. 1 |
Block Diagram |
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Ejecl/LoM |
Eject/Load<with Disc) |
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Ploy |
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F.Skip |
R.Skip |
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Pouse |
Ploy |
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Stop |
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Truy Open |
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(EJeCtl |
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!IC261-4l |
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r----t-- <Lood> |
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Troy Clos•- |
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Loo<linQ Motor |
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Open/Close |
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1__ |
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feed Motor |
Outer |
Circle |
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c1c221-8J |
Inner |
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cl•/ |
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.._;;_ |
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u |
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Piek1,1p Inner |
Inner |
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Switch |
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lh |
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FOC\IS Seorch |
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!lCIOJ-201 |
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Qjsc Motor |
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IIC22!-2) |
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TOC Re<ld |
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Kick Pu\$e |
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Notes: 1. This timing chart starts from Standby mode without putting a disc.
2.Signal marked with *is not a continuous signal.
3.Disc Motor signal shows a CLV servo signal.
4.Kick pulse is a complex signal of JP+ and JPsignals.
Fig. 2 Timing Chart
OMS-1/1 A/1 E OOD-Sl-3110 (3/36)
2.Power Supply Circuit
Fig. 3 shows the power supply circuit of the OMS·1. In the power supply circuit of the OMS-1, the power trans-
former has two windings on its secondary side. One is used for the digital circuit and another is for the analog
circuit to avoid interference between the digital and analog circuits.
Ground lines of the digital circuit and analog circuit are connected contig.uous to a point where the power trans· former is connected to the Main P.C B. Ass'y. The F'.C.B.
patterns are also designed to eliminate interference between ground lines following the connection point.
The DC power supply for the digital circuit provides non-
regulated ±12 |
V as well |
as regulated +5 V and -5.5 V. |
The DC power supply for the analog circuit provides |
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regulated ±10 |
V. |
Fig. 3 Power Supply Circuit |
3.Control System
Two MPUs (microprocessing units; IC401 and IC402) are |
select each mode. |
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incorporated on the Main P.C.B. Ass'y of the OMS-1. Fig. |
IC401 outputs display control signal corresponding to |
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4 shows the keyboard and display control circuit. IC401 |
each mode to turn ON the LED on the Control P.C.B. |
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(LC6520H-3527) on the Main P.C.B. Ass'y is an MPU for |
Ass'y. |
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system |
control. IC402 (LC6528C-3509) receives and |
Fig. 5 shows the system control circuit. |
decodes |
command signals sent by the Remote Control |
IC401 decodes signals entered from keys on the Control |
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Unit RM-1CD, and then transmits them to IC401. Each |
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P.C.B. Ass'y, and transmits them to the Digital Signal |
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command entered |
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the key |
is |
input |
into |
IC401 to |
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Processor IC (IC141; LC7860N). |
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co NTROL |
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MAIN P.C.B.I |
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1 <"-•O> |
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LC65201l-3527 |
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~ 0607 |
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>--0....1...- |
0~01 |
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+5V |
RA401 IOK ;4 |
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CN-402 |
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• |
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•p••t |
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LE0615 |
,..,..RGIJ 5.6 |
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Afpeo\ |
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A•mot<COOUO! |
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0ACLK14.3216MH'I |
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LE0617 |
......R61~ 5.6 |
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P. |
3~ |
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0401 'r |
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Cll-405 |
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l.~o |
J,:Q |
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Dul...- |
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'(1 |
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4.~m' |
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'"' |
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Fig. 4 Keyboard and Display Control Circuit
OMS-1/1A/1 E OOD-Sl-3110 (4/36)
The servo commander in IC141 is controlled by COCK (IC401-26), COIN (IC401-25), and RWC (IC401-30) output by IC401.
8-bit 1-word data is output from COIN of IC401 synchronously with COCK wh&n RWC is set to "H". This data is output in LSB first order.
Four kinds of commands are output from IC401. They are Focus Start command, Disc Motor command, Track
Jump command, and Mute command. Table 1 shows command codes.
Fig. 6 shows the timing chart of RWC, COCK, and COIN.
The command is executed from trailing edge of RWC. As Mute and Disc Motor commands are latched to the
registers, the command type varies according to the other commands input. When IC401 and IC141 are reset by Reset signal, Mute command is -= dB and Disc Motor
command is in Stop mode.
Although approximate 25ms is needed for execution of the Track Jump command, the next Track Jump
command can be given during execution of the previous
one. The Focus Start command requires more time, but other commands cannot be input during execution of
this command. Thus when more than one command is to be input, the Mute or Disc Motor command is input first followed by input of the Focus Start or Track Jump
command.
DACLK (4.3218 MHz) generated by the crystal timing generator in IC141 is input into clock circuits of IC401 and IC402. IC401, IC402, and IC141 are reset by the
Reset signal generated when the Power switch of the
OMS-1 is turned ON or OFF.
Table 1 |
Command Codes |
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M |
L |
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s Code |
s |
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Command |
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B |
8 |
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00000000 |
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Nothing |
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00010001 |
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1 Track Jump In #1 |
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00010010 |
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1 Track Jump In #2 |
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00010011 |
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4 Track Jump In |
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00010100 |
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16 Track Jump In |
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00010101 |
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64 Track Jump In |
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00011001 |
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1 Track Jump Out #1 |
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00011010 |
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1 Track Jump Out #2 |
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00011011 |
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4 Track Jump Out |
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00011100 |
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16 Track Jump Out |
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00011101 |
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64 Track Jump Out |
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00010110 |
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256 Track Check |
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00000001 |
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Mute 0 dB |
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00000010 |
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Mute -12 dB |
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00000011 |
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Mute-= dB |
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00000100 |
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Disc Motor Start |
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00000101 |
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Disc Motor CLV |
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00000110 |
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Disc Motor Brake |
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00000111 |
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Disc Motor Stop |
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00001000 |
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Focus Start |
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#1 JP Pulse width 233 µs + 233 µs.
#2 Switching from acceleration pulse to deceleration pulse is made by detecting the intermediate point of the track.
|
MAIN P.C.8. |
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1:, |
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!C402-I |
I |
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OACLK12.1604Mtl!l |
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+5Y ICl41 |
LC7060N |
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~------------1 |
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'°'" |
" |
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;ol |
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!35 |
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~WRQ |
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I |
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2-tim•• |
"' |
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!L<soour |
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nl |
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OvmomplonQ |
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SMP1>---- |
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"OA Ce,overter |
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OiQito\ |
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SMP2> -- |
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MPU |
loterjooe |
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f•!tor |
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Fig. 5 System Control Circuit
OMS-1/1A/1 E OOD·Sl-3110 (5/36)
RWC ~~~~~~~~~~~~- |
|
<IC 141-71 l _j |
L_ |
CQCK
<IC141-75l
COIN
<ICl41-74J
Fig. 6 Servo Command Timing (from IC401)
Fig. 7 shows the wireless remote control receiver circuit.
This is a circuit for receiving commands sent from the
Remote Control Unit RM-1CD. Signals are received by photodiode 01 (PH3028) in the remote control receiver unit RM601 (BX-1407), and amplified through current-to- voltage conversion by the head amplifier section in IC
CX20106A.
Then, the limiter amplifier section limits surplus parts of signal waves, and the band-pass filter whose center fre-
quency is 40 kHz suppresses out-of-band noise component. Then, the detector detects signal component, the integrator integrates it, and the hysteresis comparator outputs rectangular waveform command signal. Fig. B shows output waveform at pin 7 of CX-20106A.
Then, the waveform is input into pin 16 of IC402 and decoded. Decoded command signal is transmitted to IC401 to control the OMS-1.
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CONTROL |
P.C. B. |
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MAIN |
P.C.B. |
.,, -~ |
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RM601 |
SX-1407 |
Rtmoto Control Receiver Unit |
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~-----------------------------1 |
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IC402 |
+~v |
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: |
~C..!,.~-~~~----------Dtt.Tt".;---------, |
I |
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Fig. 7 |
Wireless Remote Control Receiver Circuit |
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Fig. 8 |
Wireless Remote Control Receiver Output |
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OMS-1/TA/1 E OOD-Sl-3110 (6/36)
4.Reset Circuit
Fig. 9 shows the reset circuit of the OMS-1.
This circuit is provided to prevent MPUs and IC141 from malfunctioning as well as to prevent any noises from being output from line output terminals when the Power switch of the OMS-1 is turned ON or OFF.
Setting the OMS-T's Power switch to ON rises the power supplies in the DC power supply of the Main P.C.B. Ass'y. When +12 V is output, emitter voltage of 0531 reaches approx. 6 V. Since base voltage of 0531 is lower than the emitter voltage while C533 is being charged, 0531 is turned ON during the charging.
When 0531 is turned ON, 0313 and 314 are turned ON to mute line output terminals. When 0531 is turned ON and its collector voltage exceeds 3 V, ZD141 is turned ON, 0141 is turned ON, and the Reset signal= Lis input into IC401, IC402, and IC141 to reset them.
When C533 has been charged, base voltage of 0531 reaches approx. +6 V; consequently, 0531 is cut off and collector voltage of 0531 lowers up to approx. -5 V. By this, 0141 is cut off, and IC401 and IC402 are released from the reset state after C154 has been charged. Further, IC141 is released from the reset state after C138 has bee.n charged. Now the OMS-1 is ready for operation.
When the Power switch is turned OFF, C533 is immediately discharged through D532. Since emitter voltage of 0531 is approx. +6 V by voltage charged in C532, 0531 is turned ON, and its collector voltage rises
MAIN P.C.B.
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up to approx. +6 V. Thus, similarly to turning ON the Power switch, Reset signal= Lis applied to IC401, IC402, and IC141, and line output terminals are muted.
Fig. 10 shows the timing chart of the reset circuit.
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Fig. 10 Reset Timing Chart |
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Fig, 9 Reset Circuit
5.Eject/Load Operations
Eject/load operations take place when a CD is loaded or unloaded.
Fig. 11 shows the eject/load circuit.
Usually, eject/load operations are triggered by press of the
Eject/Load button on the Front Panel Ass'y.
When loading a CD, however, the Play button may be pressed to permit direct operation. In this case, the Play mode is automatically entered after loading.
(1) Eject Opeation
Pressing the Eject/Load button with the Disc Tray Ass'y closed starts eject operation and moves the Disc Tray
Ass'y out. Upon press of the Eject/Load button, the signal Eject/Load = L is input to pin 6 of the IC401 (LC6520H· 3527) on the Main P.C.B. Ass'y.
Receiving the signal Eject/Load - L, IC401 outputs "H" from pin 8 (LM-). Since this upsets the input balance of IC261 (LA6500), positive voltage is output at pin 4 of IC261. The Loading Motor is applied with approx. +4.5
V, so it rotates in the reverse direction to move the Disc
Tray Ass'y out. When the |
outward movement of the Disc |
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Tray Ass'y actuates the |
Open/Close |
switch, the |
signal |
Open = L is input to pin |
6 of IC401 |
and pin 9 |
(LM+) |
changes from "H" to "L". Because the input balance of
IC261 is now restored, the Loading Motor stops, and the eject operation is over with the Disc Tray Ass'y left out.
The eject operation can be entered from any mode. Fig.
12 shows the timing chart of the eject operation.
(2) Load Operation Refer to Figs. 13 and 14.
Pressing the Eject/Load button or the Play button with the Disc Tray Ass'y open starts load operation and closes the Disc Tray Ass'y.
When the Eject/Load button is pressed, the signal Eject/ Load = L is input to pin 6 of IC401 on the Main P.C.B. Ass'y. __
When the Play button is pressed, the signal Play = L is input to pin 4 of IC401. Upon receipt of this signal, IC401 outputs "H" level from pin 8 (LM-).
Since this upsets the input balance of IC261, a negative voltage is output at pin 4 of IC261. The Loading Motor is applied with approx. -4.5 V, so it rotates in the forward direction to close the Disc Tray Ass'y.
When the closing motion of the Disc Tray Ass'y actuates the Open/Close switch, the signal Close = L is input to pin 5 of IC401, and pin 8 (LM-) changes from "H" to "L" level. Because the input balance of IC261 is now restored, the Loading Motor stops and the Disc Tray Ass'y closes.
OMS·1/1A/1E OOD-Sl-3110 (7/36)
Then, when pin 3 (Pickup Inner) of IC401 is at "H" level, the Feed Motor is rotated, and after the Pickup Inner signal is changed to "L", the Read-In area is read to terminate the load operation.
If the Pickup Inner signal is already at "L" level, the Feed Motor is rotated slightly to make the pickup direction forward, so that the Pickup Inner signal is set to "H" level. Then the Feed Motor is rotated in the reverse direction to set the Pickup Inner signal to "L" level. Now the Read-In area is read to terminate the load operation.
If the load operation was started with the Play button instead of the Eject/Load button, the Play mode is
entered after the load operation.
Eject/Load
IIC4016l
LM+
IIC401-Ql
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IIC401-6l
approx.
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Fig. 12 Eject Timing Chart
Eject I Locd <IC401-6l
LM-
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Locdinq Mctor
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CIC401-5l
Reeding of _____,n_ ReodIn Arec
Fig. 13 Loading Timing Chart (When Eject/Load switch is pressed)
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Fig. 14 Loading Timing Chart |
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Fig. 11 |
Eject/Load Circuit |
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pressed) |
OMS-1/1A/1 E OOD-Sl-3110 (8/36)
6.Auto Power Control
Fig. 15 shows the auto power control circuit of the OMS-1 which mounted on the Laser Pickup Ass'y. The auto power control circuit has two functions: (1) control of the laser diode so that the amount of light emission is not affected by temperature changes, etc., and (2) protec-
tion of the laser diode against overcurrent.
Overcurrent into the laser diode leads to breakdown or deterioration of the laser diode. The semi-fixed volume is incorporated in the Auto Power Control P.C.B. Ass'y of the Laser Pickup Ass'y. This volume must never be adjusted because it has been exactly adjusted in our factory.
The laser diode of the OMS-1 emits light if:
(1)The Disc Tray Ass'y is loaded.
(2)The OMS-1 is in Play or Pause mode.
However, during reading of the Read-In area at the load time, the laser diode emits light even if the OMS-1 is not in Play or Pause mode.
When the Disc Tray has been loaded, the Open/Close switch on the CD Mechanism Ass'y is switched to close side, so that the signal Close = L is input to pin 5 of IC401. Then, pressing SW603 (Play) or SW604 (Pause) on the Control P.C.B. Ass'y causes input of the signal Play= L or Pause = L to pin 4 or 3 of IC401, so that pin 10 (LSON) of IC401 outputs the signal LSON = L. Since the LSON = L signal enters pin 38 (LDSW) of IC101 (LA9200), the laser ON/OFF circuit is turned ON and approx. -5.5 Vis output at pin 39 (LOO) of IC101. Then this voltage enters the APC (auto power control) circuit and turns ON 02, 03, and 01, so that the laser diode of the Laser Pickup Ass'y emits light.
The amount of light emission from the laser diode is detected by the monitor diode of the Laser Pickup Ass'y and fed back to base of 02 in the APC circuit. This feedback signal is compared with the -2.3 V reference voltage at emitter of 02. If the feedback signal is lower than -2.3 V, the current flowing in the laser diode increases. If the feedback signal is higher than -2.3 V, the
current flowing in the laser diode decreases. Thus, the laser diode is controlled to emit a constant amount of light.
When pin 10 (LSON) of IC401 is set at "H" level, the laser diode does not emit light, because 02, 03, and 01 are cut off.
To measure the current flowing in the laser diode, determine the voltage across R2 (22!1) in the APC circuit using a DC voltmeter. Then calculate the current from the formula I= V/22.
The timing chart related to laser diode light emission is given in Fig. 16.
For measuring the laser power of the OMS-1, it is not necessary to bring the OMS-1 into Play mode or Pause mode. It can be measured easily only by grounding TP401 on the Main P.C.B. Ass'y, causing the laser diode to emit light.
Eject/Load
!IC40l-6l
Close (1C401-5)
Play or Pouse |
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ITT |
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<IC401-10l |
' ------- |
Fig. 16 Laser ON/OFF Timing Chart
CONTROL P.C.B. |
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MAIN |
P.C.B. |
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SWSOI |
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O TP403 |
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>Jil-+-9-t"'-'-.,...---16 |
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Fig. 15 Auto Power Control Circuit
7.Focus Servo System
Fig. 17 shows a block diagram of the focus servo system.
The focus servo has the function of maintaining a fixed distance between the laser pickup's object lens and the
CD's signal surface.
As the CD begins rotation, the focus servo shifts the object lens of the laser pickup vertically so that the distance to the signal surface is constant at any given time.
The vertical deviation of a CD is specified to be within ±0.5 mm. The focus servo of the OMS-1 uses the astigmatism method. This method is illustrated in Fig. 18 showing the construction and in Fig. 19 showing the principle of operation.
The cylindrical lens shown in Fig, 18 plays an important role in the astigmatism approach. This lens acts as a lens only in one direction (x-direction in Fig. 18), but it does nothing in the other direction (y-direction in Fig. 18). Therefore, at point B, the light is condensed into a vertical (y-direction) line, and at point A, into a horizontal (x- direction) line. An enlarged view of optical path between points A and B is presented in Fig. 19. At the midpoint J between points A and B, the beam takes a circular form.
At points nearer to point B (farther from point J), the beam shape becomes a progressively longer ellipse extend- ing in the vertical direction. At points nearer to point A, the beam shape becomes a progressively longer ellipse
extending in the horizontal direction.
In the astigmatism method, the object lens is adjusted so that the image of CD's signal surface is formed at point J when the signal surface is on the focal plane of the optical system. With a quarter-split PIN photodiode placed at point J as shown in Fig. 19, the four outputs are arithmetically operated in the formula "(A + C) - (B +
D}". The result of this arithmetic operation, which is zero, serves as the focus error signal.
When the CD is nearer to the object lens, the image on the quarter-split photodiode at point J becomes a vertically longer ellipse, giving a positive focus error signal. When the CD is farther from the object lens, the image becomes a horizontally longer ellipse, giving a negative focus error signal. Thus the focus error signal is bipolar.
C====:;::;==:;:== IVertical deviation of CO |
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Fig. 17 Focus Servo System Block Diagram
OMS-1/1A/1 E OOD-Sl-3110 (9/36)
Laser Diode
Sylindrical
Lens
A
•
CD's Signal Surface
Fig. 18 Astigmatism Method
A
Too Close |
Good |
Too Far |
Focus Error
Signal
+V
ov
-v
Fig. 19
OMS-1/1A/1E OOD-Sl-3110 (10/36)
Fig. 20 shows the focus servo circuit of the OMS·1.
The focus servo circuit of the OMS-1 is located in the Main P.C.B. Ass'y. It consists of IC401 (LC6520H·3257), IC141 (LC7860N), IC101 (LA9200). IC201-2/2 (LA6510). focus control circuit, and peripheral circuitry.
The |
focus servo |
is control led primarily by |
IC401 and |
IC141. |
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Fig. |
21 shows the |
RF amplifier circuit for the focus servo |
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and |
the EFM signal. This circuit performs |
current·to- |
voltage conversion of output from the quarter-split photodiode.
Output of the quarter-split photodiode is input into the Main P.C.B. Ass'y first: Through A + C and B + D accumulation it is input into pins 41 and 42 of IC101. IC101 amplifies input signals through current-to-voltage (I - V) conversion. -(A + C) signal and -(B + D) signal processed through current-to-voltage conversion are wired-
When the Focus Search command is transmitted from IC401 to the servo commander in IC141, IC141 causes the servo commander to output the FST signal (from pin 14), and discharges C147 (100 µF, 10 V) through R137 (180 Q). At this time, the object lens of the Laser Pickup
Ass'y lowers.
Then, IC141 causes the servo commander to output the FOGS signal (from pin 13) to pin 20 of IC101 (FOGS) and the Focus Control P.C.B. Ass'y to deactivate the
focus servo.
Simultaneously, it charges C147 (100 µF, 10 V) through R143 (68 kil). At this time, the object lens of the Laser Pickup Ass'y rises slowly.
The focus zero detector section in IC101 detects the S-curve of the focus error signal (as shown in Fig. 23).
This £.curve is detected when it gets almost in focus.
ORed by resistors of 10 kQ, inverted and amplified by the RF summing amplifier. and output from pin 36 of IC101 as the EFM signal (A+ B + C + D). On the other hand, the 1-V processed signals are differentially amplified by the focus error amplifier and output from pin 31 of IC101 as the focus error signal [(A+ C) - (B + D)]
In general, the focus servo circuit executes focus searching
first. When the focus zero detector signal is detected,
focus searching terminates, and focus servo is activated.
Further control is in accordance with the focus error signal.
Fig. 22 shows the focus search circuit.
O MAIN P.C.8.
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Fig. 21 RF Amp. Circuit
MAIN P.C.B.
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Cl47 100µ |
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IOV |
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ISO |
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IC201 LA6510 |
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FOCUS CONTROL |
P.C.8. |
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Fig. 20 Focus Servo Circuit
When the S-curve signal lowers than -0.6 V, FZO = L signal is output from pin 18 of IC101 and input into pin 15 of IC141. For generation of FZO signal, refer to Fig. 24.
When the FZO = L signal is input, the servo commander in IC141 resets the FOCS signal. By this, FOCS= L signal is output from pin 13 of IC141. This signal is input into pin 20 of IC101. Since pin 30 of IC101 (FSW) is consequently brought into the high-impedance state, focus error signal is input into the focus coil driver, activating focus servo, and the focus error signal controls the focus coil.
After outputting the Focus Search command, IC401 examines input signal into pin 39 (ORF) to check whether focus servo is activated. If focus servo is not activated during charging C147, IC401 outputs the Focus Search command again.
OMS-1/1A/1 E OOO-Sl-3110 (11/36)
The ORF signal is generated in IC101. Output signals from the quarter-split photodiode are summed and amplified by the RF summing amplifier in IC101 to be the EFM signal, and is input into the peak hold section and bottom hold section. The ORF signal is set to "H" if voltage at pin 35 (PHLO) is 0.45 V. It is set to "L" if PH LO voltage is 0.42 V.
The object lens of the Laser Pickup Ass'y is located at the mechanical zero point, i.e., in the lower position when the
Power switch of the OMS-1 is set to OFF. When the
Power switch is turned ON, it moves up to the electrical zero point, i.e., a point where 0.5 V is applied across the focus coil. Based on this point as the center, the object lens moves up and down for focusing.
VR101 (100 kill is for adjusting offset of the focus error amplifier, and VR102 (10 kill is for adjusting focus gain.
MAIN P.C.8.
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0102 |
0101 |
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VRl02 |
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'°' |
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0.6V j |
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"'"" rocu• Goio |
IC20l |
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Focu• Zero ~ l |
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~"l |
|
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|||
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'" R203 |
LAl>510 |
|
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|||
Douctor |
30 |
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"' |
'7 212' |
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'"1 |
---R\44;:;:;::+~~&" |
-n |
|||||
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IOOK c" |
C203 |
'°"'' |
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~ |
C202 |
R206 |
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0.111 |
'°' |
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1-f'~'~~<•H>--~,~,,,_._~~~~~~~--. > |
|
160 |
rgi |
Fig. 22 Focus Search Circuit
_L\y----t |
Cl47 |
Fig. 23 Focus S-Curve
FOCS |
I' |
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I |
-150••1--
Focu.s Error
FZO
Fig. 24 Timing Chart