Kenwood LVD-K9200 Service Manual page 20

LVD-K9200
CIRCUIT DESCRIPTION
3-3. VIDEO CIRCUIT UNIT (X35-2120-20)
-—HefWe. [Name
| Use andFunctions | ____—=S=S~S~S~S~SCSpwratIONSC~—"~*™
IC] TC74HCOOAP Shaping of EFM wave farm | Shapes the digital sound wave form, and changes the wave forms of LD, CD,
a ee Change-over LD, CD, EFM | and EFM with the asymmetry and p-com control command (AN)
Asymmetry circuit Then, transfers the signals only when focus is locked by the contral command (FOK)
ee ee and output of IC1 3/4 (For asymmetry)
1C3 CA0002AM FM audio demodulation | ¢ Detector, « Drop-out detection and correction, © CX-NR decoding, « Mute
Digital signal processing | © Relay of bit clock, * Demodulation of EFM data, * Demodulation of sub code |
1C6
Protection of EFM frame and sync signal, ¢ Error correction, ¢ Control of disc servo
T1C5 1172) |NIM4565D | LPF fordisc motor servo _| Filtrates the phase comparison output from the signal processor
|__ic8__|SMSG72BS
__ [Digital fiter and OAC | /A type 2 channels D/A converter, builtin digital filter (@fs)_—
167 ia, [NuN4s650
[Leh ference amp (ig |Fitrates and replay PWM outputs of ICB through differential creut =|
T_1c7 a2) [NUM4565D_ _____[LchLPF. (Digital) | Filtratesreplayed audio signals,
T 1C1012/2) _|NJM4565D_____—'|Rchmixingamp
_| For replay audio signal andmicaudio signal
Pict
[a7asime.szesP__[Main com
[Controls main functions of mechanical controletc.
Change-over to analog audio and digital audio
{C13
TC40538P Switch
For changing the input from the 24-bit code and Q code to the main p-com (4P)
XRU4053B
For changing the input from the HALF OPEN and FULL OPEN switches
: to the main p-com (15P)
For changing the input from the UNCLPSSW, ACLPSW, and BCLPSW
to the main pt-com (12P, 13P)
[cea [vases [video signal processor | Processing RF signal into deo Snel
R
Li
5
1C55
TC74HC4066AP
Controles to sample hold of sub carrier
B
8
1c56 | NJM45650 Phase compensation amp for PLL ;
Icsg___ | TC4053BP, XRU40538 For changing the servo characteristics for 30cm, 20cm, LD, CDV, and (D
(C60 NJM4565D Amp Control of inversion and no-inversion modes of the disc motor servo
Amplification of change-over signal of the characteristics of the disc motor sero
p
1C61 NJM4565D Phase compensation amp for disc motor servo
| 163 |MC141621______|Signalprocessor___| » A/D conversion, « Logical Y/C separation, » D/A conversion of video sgrvals_|
| ar___[28c1923(R, 0) ___[AmpforRF signal [Amplifies thefilteredLO-AFsignals
2$C3311A (Q, R)
2SC3311A (Q, R)
25A1048 (Y, GR)
For CD-RF signals
Phase compensation and amplification of CD-RF signais
2SA1309A (Q, R)
2$C2458 (Y, GR) For CO-RF signals Phase compensation and amplification of CD-RF signals
en
* Drop-out correction of video signals, * Digital TBC, * Generate reference signi
© D/A conversion, © Disc servo, * Noise reduction, © 24-bit code separaion
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