Function Of Ic Terminals - Technics SL-PS740A Service Manual

SL-PS740A
m FUNCTION OF IC TERMINALS
Function
Division
Gain control input of HF
amplifier.
Current output from HF
amplitude detector
Positive supply voltage
HF amplifier and equalizer
voltage output
Starting up capacitor input
On/off control (start input);
ready signal output (starting up
procedure successful)
0
Division
Function
Current output of normalized,
switched focus error signal
Current output of switched focus
error signal, intended for lag
network
Laser amplifier current output
Laser monitor diode input
Gain control input for AC and LF
amplifiers. Current output from
LF amplitude detector
Beg I
DC and LF gain control reference
Bgc I F
current input
FOC Focus normalizing circuit
START starting current
PLLH PLL on hold output
TL Track toss output
Drop out detector suppression
input
Le Negative supply connection for
FE and FElag output stage; also
substrate connection
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Division
Positive supply voltage
Frequency setting capacitors for
oscillator
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3 Vext
Low pass filter for lret, used in
track loss (TL) detector and LF
gain control
LPF
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Wobble generator input
Biassing resistor for oscillator
frequency and internal
amplitude
Radial error digital signal
devided by four
Digital output of sign (Re2—Re1)
Input control bits for off-, catch.,
play-status and DAC output
current
Positive external voltage input
Negative external voltage input
(also substrate connection)
GND terminal
Current output of amplified
(Re2— Ret) input currents
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RADout
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Radial error input
Voltage output of integrated
(Re2—Re1) input currents
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Summation of amplified currents
from D3 and D4
Summation of amplified currents
from D1 and D2
Current inputs to DC and LF
photo diode amplifier
Current inputs to DC and LF
photo diode amplifier
26] vein | ot | Current input to HF amplifier
GND a Ground connection of device
Decoupling input
eee : {internal bypass)
Function
Division
Connection of integrator
capacitor for (Re1—Re2) input
currents
Lead output
i Internal reference voltage output
Gain control input for radia! error
signal
Biassing resistor for current
output for track jumping
(3/2 bits)
Offset control input for radial
offset
Offset control output for radial
offset
Low-pass filter for Re1 and Re2,
used for radial offset control
High-pass filter for Re1 and Re2,
used for radial offset control
Input for amplified currents from
photo diodes Di and D2
Input for amplified currents from
photo diodes D3 and D4