Sansui MC-X7 - IC Functions and Block Diagrams; CXA1081 S (RF Amp.) Function and Diagram; CXA1372 Q (Focus;Tracking Servo) Function and Diagram

MC-X7/X7L
<Compact Disc Player Section>
MC-X7/X7L
<Compact Disc Player Section>
10. INTERIOR BLOCK DIAGRAM & TERMINAL FUNCTION
OF ICs
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¢ Terminal Function <CXA1081S>
1/0 Description
Pin Name
RF!
Defect amplifier bottom hold input.
' This terminal is connected Pin 16 with
a coupling capacitor.
Defect amplifier bottom hold output.
(ol
Vee | — | Negative supply voltage: —8V.
ro
RF summing amplifier input.
RF summing amplifier input.
RF Summing amplifier feedback signal
input.
Terminal for switching P-sub/N-sub of
LD (laser diode).
| APC LD amplifier output.
| APC PD amplifier input.
RF 1-V amplifier (1) inverting input.
This terminal is connected to the pin di-
ode (A+C). |
RF |-V amplifier (2) inverting input.
This terminal is connected to the pin di-
ode (B+D).
Bias terminal for the focus error ampli-
fier non-inverting.
Focus error amplifier output.
Tracking error amplifier output.
Defect comparator output.
Mirror comparator output.
Mirror comparator non-inverting input.
This terminal is connected a mirror hold
capacitor.
[19 | Fe
| 20 | TE
DEFECT
2)
This terminal is connected a defect bot-
tom hold capacitor.
Auto asymmetry buffer control signal
input.
EFM comparator output.
FOK comparator output.
Laser diode ON/OFF switching input.
NO
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F I-V amplifier inverting input.
This terminal is connected to the pin di-
ode (F).
E I-V amplifier inverting input.
This terminal is connected to the pin di-
ode (E).
E 1-V amplifier output. -
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LD
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Positive
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voltage:
+5V.
Oy (Vcc + Vee)/2 voltage output.
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17. | ISET Conducts a current to determine the peaks of focus
search, tracking jump and thread kick.
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® CXA1372 Q (Focus/Tracking Servo)
Pin No.| Pin Name
FGD To decrease highband gain, insert a capacitor between
this terminal and pin 3.
FS3 Switches the highband gain of focus servo by turning
ON/OFF FS3.
FLB This external time-constant terminal is to increase
focus servo in lowband.
ps [FeO [Fomseveoupt
| 6 [FEO | Reversed input terminal of focus amplifier
7 |SRCH This external time-constant terminal is to create focus
| search waveform.
This external time-constant terminal is to switch
tracking highband gain.
Bil
tracking highband gain.
12 [TAS __| Reverse input tominaovacking amifer
FSET This terminal is to set the peak of phase compensation
for focus tracking and f0 of CLV LPF.
| SSTOP | This terminal detects ON/OFF of the limit SW to detect
the innermost envelope of disk.
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| | 29 [MIRR Mirror signa! output terminal
Pin No,| Pin Name
function
(2 Pm [accent eens
resistance.
lal cake Thread run-out protective circuit is actuated at “L”.
It contains a 47 kQ pull-up resistance.
[22 [GLK | Sera data vanster dockinpuem PU
as pat [latchinputtem PU
[24 [DATA [Serial datainputtom GPO
| 25 [XRST | It is reset when reset input terminal is “L”.
[26 [COUT | Sigal ouput or counting the number ofvaks
27 Issues outputs, e.g. FZC, AS, TZC, SSTOP and BUSY
according to the command from CPU.
ee Defect signal input terminal. The defect protection
circuit is activated upon “H”.
[32 [EF | Ouputierminal of EFM comparior
[88 [FOR |FOKsgnalinpatcming
[38 [6P | Nenveversedinputteminalof MIRA comparator
[28 |RF__|Inputerninal of AF summing amifer |
[#2 [726 | nputeminal or vacking seo cost comparator |
a8 [TE | raking ror signal inputting
[#5 [ATSC | Window oaraor put trminal to detectATSC
[#8 _|F20__|inputiorinal ooeus zero eoss comparator |