3
KRC-15R,179R,25R,279R,281R
COMPONENT DESCRIPTION
REF No.
FUNCTION
OPERATION
IC1
SYSTEM µ-COM
Controls the unit.
IC2
E-VOLUME
Controls the volume and selects source.
IC3
MUTE LOGIC
Controls the mute output.
IC4
POWER AMPLIFIER
For the speaker output.
IC5
EQUALIZER AMPLIFIER
For the cassette tape's signal.
IC6
RESET
Resets the power.
IC7
RDS DECODER
Decodes the radio data.
Q49
ACC DETECTION SW
Outputs "H" during the ACC off.
Q50
BACK-UP DETECTION SW
Outputs "H" when the back-up voltage is under 9.2V.
Q51,52
BACK-UP 5V DRIVER
Works when back-up current exists.
Q53
P.ON 5V SW
Works during the power on.
Q54,55
8V SW
Works during the power on.
Q56,57
8V DRIVER
Works during the power on.
Q58,59
ILLUMI +B SW
Works during the power on.
Q60,61
ILLUMI +B DRIVER
Works during the power on.
Q150
E-VOL MUTE SW
Works when the back-up current is detected
or the changer mute works or system µ-com mute works.
Q151
SVR FORCED DISCHARGE SW
Works when the amplifier mute works.
Q153
PRE OUT MUTE SW
Works when the back-up current is detected
or the changer mute works or system µ-com mute works.
Q201
FM +B SW
Works during FM mode.
Q203
AM +B SW
Works during AM mode.
Q260
MOTOR +B SW
Works during the tape mode.
Q261
MOTOR +B DRIVER
Works when Q206 works.
Q301
CD-CH RESET SW
Works when the power is reset and the reset SW works.
Q320
PANEL 5V SW
Works when the back-up current exists and the panel
is attached on the unit.
Q350
P.CON DRIVER SW
Does not work during the power off and the ALL OFF.
Q351
P.CON PROTECTION SW
Works when the P.CON is short-circuited on the GND.
Q352
P.CON PROTECTION INHIBIT SW
Inhibits the protection SW in a moment during the P.CON on.
Q353
P.CON DRIVER SW
Does not work during the power off and the ALL OFF.
Q450,451
PRE OUT MUTE SW
Works when the back-up current is detected
or the changer mute works or system µ-com mute works.
Q500
AUDIO OUTPUT BUFFER
For RDS decoder.
Q501,502
AFC TIME CONSTANT SW
Works during receiving FM signal.
Q503
NOISE BUFFER
For noise level detection.
SYNTHESIZER UNIT (X14-656x-xx)
