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KRC-999I1
DESCRIPTION OF COMPONENTS
SUB-CIRCUIT UNIT (1) (X13-5730- 11)
Component
Application/function
Operation/condition/compatibility
1C1
G.EQ.
G.EQ.
7-band hybrid IC for G.EQ. Used in combination with IC2.,
7-band electronic VR for G.EQ.
Reset IC
Used for system resetting of G.EQ microprocessor IC4.
G.EQ microprocessor
G.EQ key input control
aneeeal which controls the G.EO volume display and key inputs.
Inhibits G.EQ key inputs when INH is Lt
G.EO key input contro}
IC8,9
G.EO key input control
M1 to M5, G/A, G.EQ, UP/DOWN
key switches.
G.EQ band f1 to f7 key switches, ME key switch.
1c10
G.EQ band UP/DOWN
Selects G.EO band f1 to f7 according to data from X25-3010 IC1.
1C11,12
Display LED segment driver
IC13
Display LED digit driver
1C14
BCD decoder
Extends digit signals according to data from X25-3010 !C1.
1C15,16
TAPE and TUNER
key control
| TUNER and TAPE mode key switches.
Q1
Spectrum analyzer muting
Muting of audio signa! for spectrum display.
Q2
Spectrum analyzer buffer
Buffer for audio signal for spectrum display.
Q3~5
G.EQ display power switch
Switch which controls G.EQ display power supply with ACC.
Q9,10
Reset switch
Qi1
Display control
Switch which resets [C3 when the Reset switch on the panel is pressed.
ON when slide pocket is opened.
Q12,13__
AT1, AT2 and MANU switch _
AT1, AT2,
MANU key switch.
Q14~19
Display LED digit driver
SUB-CIRCUIT UNIT (2) (X13-5740- 11)
Component
Application/function
Operation/condition/compatibility
1C1
{SO amp
Isolation of AUX.
Qi
P-ANT driver
Goes ON when there is P-CON output, and supplies power to P-ANT.
Q2,3
P-ANT protect inhibit
—
Inhibits the P-ANT protection at the rise of ACC.
Q4
DOLBY NOISE REDUCTION UNIT (X14-2190-11)
Component
P-ANT protect
P-CON driver
Apptication/function
Goes ON when P-ANT is grounded, and turns Q1 ON for protection.
Go ON for P-CON output to the later stage (amp, etc.).
Operation/condition/compatibility
1C1
Buffer
Buffer in the previous stage to Dolby IC and dbx IC.
(C2
Dolby
Dolby B/C decoder.
IC3
dbx
dbx decoder.
Ic4
dbx output stage amp
Amplifies dbx output by 20.8dB.
IC5
{SO amp
Tuner-line isolation amp.
1C6,7
Analog switch
Q1,2
Muting
Switching of DOLBY, dbx, TUNER and AUX.
ON when muting tape output.
Q3
dbx ON/OFF
OFF in dbx mode.
Q4
dbx ON/OFF
ON in dbx mode.
Q5
Tape sound leakage inhibit
ON in TUNER
or AUX
mode.
AUX P-CON level converter
Conversion of AUX P-CON (microprocessor) into 9V.
TUNER
P-CON level converter
Conversion of TUNER
P-CON (microprocessor) into OV.
Dolby B/C
ON in Dolby C mode.
Dolby ON/OFF
ON when Dolby is OFF.
13
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