Table of Contents
Advertisement
KRC-999I1
DESCRIPTION OF COMPONENTS
Component
Application/function
Operation/condition/compatibility
Q63 ,64
Tracking regulator
Supplies the auto-volume + power simultaneously.
Q65
Auto-volume sensitivity switch
Switches the sensitivity of the auto-volume and microphone.
Q66
Logarithmic amp
In combination with 1C16, functions as an logarithmic amp.
Q67
Buffer
Buffer.
Q70
Metal switch
Switches between METAL/NORMAL.
Q71
F/R switch
Switches between F/R.
Q72
5V AVR
5V AVR for microprocessors, etc.
Q73
9V AVR
9V AVR for display.
Q74
5V AVR
Darlington-connected to Q72.
Q75
9V AVR
Darlington-connected to Q73.
L
Q76
Protector circuit
5V circuitry short-circuiting protection circuit.
Q77,
—
Protector circuit
9V circuitry short-circuiting protection circuit.
Q78
Protector circuit
Combined with Q76.
|
a79
=
Protector circuit
Combined with Q77.
083,84
9V AVR
9V AVR for audio circuitry.
O85 -
_
QV AVR
Darlington-connected to 083 and O84.
8687
|
Turns off ali lights at ACC OFF.
Q88
8V AVR
8V AVR for remote controi.
PANEL
ASS'Y
Component
(A20-5295-05)
Application/function
Operation/condition/compatibility
IC1,2
Spectrum analyzer/G.EQ display driver
TUNER UNIT (X05-3390-11)
Component
Application/function
Operation/condition/compatibility
Ql
LO/DX SW
ON for LO, OFF for DX.
Q2
IF amp
Amplification of IF.
Q3
i
FM S meter output buffer
.
Eliminates the influence from impedance variation in S meter line.
Q4
7
AFC SW
ON during reception, OFF during search,
Q5
:
ANRC cotrol
Discharges CRSC capacitor C11.
Q10
AM S meter output buffer
Eliminates the influence from impedance variation in S meter line.
Qu
|—~—~—":CM PE
Low-pass filter for FM Vt.
Q13,14
AM LPF
Low-pass filter for AM Vt
ais
SD inverter SW
ON when SD is present, OFF when not.
Q16
AM +B SW.
ON when AM is selected.
Qi7
FM +B SW
ON when FM is selected.
Qig-
FM Lch buffer
-
Eliminates disturbance in post-stage LPF characteristics due to 1C2
output impedance.
Q20
FM R ch buffer
.
Eliminates disturbance in post-stage LPF characteristics due to IC2
output impedance.
a
5V AVR
Power supply for IC3.
Q22
9V AVR
QV power supply for audio signal circuitry.
Q23,24
Tuner P.CON SW
ON in Tuner mode.
Q25,26
~~
Muting
Audio output muting.
IC1.
FM tF amp/detector
{F amplification, soft muting control, and |F detection.
IC2
Noise canceler and MPX
Noise canceling, ANRC cotrol, L/R demodulation.
C3.
PLL
Digital tuning PLL cotroller. Controlled by the serial data from IC1
in Power Supply unit (X25-3010-11).
ICA
;
a Active LPF
"| Eliminates pilot and subcarrier components by cutting frequencies above 15kHz.
Output amp
Buffer amplifier for supplying tuner output to the main unit.
15
Advertisement
Table of Contents
