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KR-V126R
10
CIRCUIT DESCRIPTION
AUDIO UNIT (X09-2470- 10)
Component
Use/ Function
Operation/Condition/Compatibility
1C1
|
Phono equalizer
IC2,3
Snput selector select
1C4
GE, GE REC ON/OFF,
surround mode select
ICS
Buffer for REC
Q
Q
IC6
VR array for GE (graphic equalizer)
IC7,8
Op amplifier for GE (graphic equatizer)
| Semiconductor L (self-reactance) x 7.
Ic9
Op amplifier for surround
Stadium surround,
1C10, 11
Electronic volume
1C10 for front channel, 1C11 for rear channel.
IC12
3-pin regulator
15V.
Q1,2,7,8
MM/MC select
Q1 and Q2 : Input impedance select ; Q7 and Q8 : gain select,
Q3~6
PHONO
input stage
Differential input section.
Qg, 10
Muting
Muting when changing the selector.
Qi1
Q9 and Q10 are driven by open collector.
Q13, 14
L and R mixer for apectrum analyzer
Emitter follower.
Q15,16
Stadium surround
Input buffer amplifier.
Q17,18
Muting
Muting for MAIN IN section.
Q19, 20
Drive circuit for muting
Q21, 22
Buffer for rear-channel amplifier
Q23, 24
Muting
Muting for rear-channel amplifier.
Q25, 26
Constant voltage for —33V
Q
For FL ON (go on) timing
Switch for —33V, high-8 (beta) transistor.
Inverted-darlington connection with Q32
Error amplification.
For —14V constant voltage
—14V constant voltage
3
4
Q35, 36
27
Q28
30
31
32
Q.
—14V constant voltage
5V constant voltage
5V power supply for display.
5V power supply for u-COM (microcomputer).
5V constant voltage
Relay drive for surround
For main amplifier bias
Q39~42
DISPLAY UNI
Component
Main amplifier final stage
T (X14- 2130-10)
Use/Function
Operation/Condition/Compatibility
IC1
Microcomputer
IC2~5
Transistor array (for FL drive)
Active low.
IC6
Static driver (for FL drive)
1C7
(GE, SP display IC
1C8,9
Transistor array (for FL drive)
Active high.
1¢10, 11
Logic IC
Data mute circuit.
1012, 13
Analog switch IC
Video select.
1C14~17 (2/2)
Spectrum analyzer band-pass filter
1C17 (4/2)
Input amplifier.
Spectrum analyzer band-pass filter
Qi~4
| Digital transistor (for FL drive)
Q7
Turns OFF when a through-dubbing operation is activated in VIDEO 2
For through-dubbing controt
and VIDEO 3 mode.
Video output buffer
Data mute circuit
Realy drive
Microcomputer reset circuit
Turns ON for several milli-seconds, when power is turned ON.
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