CIRCUIT
DESCRIPTION
1. Description
of components
1-1. DACUNIT
(x25-2860-11)
Component Use/Function Operation/Condition/Compatibility
lcl ,lc2 PCM56P.K D/A converter Convertsdigital
value
into agalog
quantity.
tc3,rc4 NJM5532D.D l-V converter 11/21
: Converts
DAC current input into voltage.
(2121
: Generates
offset voltage{or distortion correction.
tc5-rc10 NJM5532D-D Opamp Forms
a GIC (General
lmpedanceConverterlwith LPF.
tc ,1c12 pPA6SHA Dual
FET Forms
the 1st
stageof output amp.in thefinal stage.
LIJ cx20197 Opamp Amplifier device
of output amp,
a1A SM5804B Digitalfilter Digitalfilter with 4-fold oversampling.
L t3 TC74HCO4F HEX inverter Inverts
the logic
of digitalfilter output anddelays
data.
Lto TA79LO06P 3-terminalreoulator (-) power
for DAC.
c't7 TATSLOO6AP 3-terminalregulator (
+)power
for DAC.
tc 8,tc19 TC74HC74P Dual
D flip-flop Usedin distortioncorrector
circuit
tc20 TC74HC393P Dual4-bit binary counter Usedin distortion
correctorcircuit.
tc21 TC74HCO4P HEX inverler Usedin distortion
correctorcircuit.
PH1 T95-0035-05 Photocoupler Interface
betweendigitalfilter and DAC (Used
for data).
PH2 T95-0036-05 Photocoupler Interfacebetween
DAC and X32 (Emphasis).
PH3 T95-0036-05 Photocoupler Interface
between
DAC and X32 (Muting).
01
-o4 2SC945(A)(O,P) Transistor Used
in cascode
stageof 1
st stage
o.f
output amp.
05.06 25K170(V) FET Begulated
power
supply
for constant-voltage
circuit of ist stage
of output amp.
07,Q8 2SC945(A)(O.P) Tra
nsistor Regulated
power
supply
for differential
amp.of 1st
staqeof output amp.
010 DTCl
14YFF Switch De-emphasis
relavdriver
Q1
1DTC]14YFF Switch Muting relaydriver. 'r
012 DTC114YFF Switch Emphasis
photocoupler
driver.
n1? DTC11
4YFF Switch Muting photocoupler
driver.
014 2SA733(A),(O,P) Switch Usedfor supplyingvoltage
to the photocoupler
output.
D1
.D2 RD5,iJS{B) Zener
diode Suppliespotential to the cascodestageof lst stageof output amp
D3,D4 RD5.1JS(B) Zener
diode Determines
the potential
of constant-current
circuit of differential
amp of 1
ststaqeof output amp.
D5,D6 RDl
OES(B) Zener
diode Feference
power
supply
for constant-voltage
circuit of 1st
stageof
output amp.
D8 tSst/u Switch Protects IC1
6 a
ga
inst counte
r-withstan-d
i
ngvol
taqe.
D10,D11 tsSt/t) Switch Usedfor countermeasure
against
staticelectricity.
D12.D13 iSS133
or1SS176 Switch Usedfor short-circuiting
counter-electromotive
voltaqe
of relav.
ut4 RDl
OES(B} Zener
diode Determines
the operatingvoltage
of transistor
SW014
Litc 1
SS1
76 Switch Protects
lC1
7 againstcounter-withstanding
voltage.
Table1-1
l-,
a(
t:
t
ji
1-2. CONTBOL
UN|T
(X29-1780-00)
Component Use/Function Operatiory'Cond
ition/Compatibil
ity
tcl cx20109 Optical
pickup preamp. Focusing
error
signal
generation,
trackingerror
signal
generation,
RF
signal
generation
and phase
compensation,auto-symmetry correction
ci
rcuit.
tc20/21 M5218P Trackingerror polarity detector When
tracking
error
is
(
+ ) :+4V output.
When
(-) :-4V output.
tc2l2l2l M5218P Flaw
detectorlevelcomparator Normally : -4V output. When flaw isdetected : + 5V output.
ILJ pPD4053BC Trackingerror
signal
selectswitch
The error signalsupplied to the tracking servocircuit isselected
accord-
ingto the logic
of the MIRR signalsupplied
via
pin 11.
When
MIRR is
"L" : Normal
trackingerror
signal.
When
MIRR is
"H" : Constantvoltage
at + 0.5V or -0.5V.
The polarity of the constant voltage
supplied when the Ml RR signal
is"H" isselectedaccordingto the tracking error polarity detector
output suppliedvia
pin 1O.
When
"H" : + 0.5V. When
"L" : -0.5V.
Theerror
signalsuppliedto the tracking
servocircuit isdetermined
accordingto the polarity of the flaw detector output supplied via pin 6.
When
"L" : Errorsignalis
suppliedto the tracking
servocircuit.
When
"H": Error
signalisnot supplied
to the tracking
servo
circuit.
Table1-2 7
