Kenwood KRC 279 RG Service Manual

Page 3

KRC715R(K)]NT1p 00.10.20 4:13 PM «3? 26

+
KRC-15Fi,179R,25R,279R,281Fl

REF No. FUNCTION OPERATION
IC1 SYSTEM u-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 EOUAL|ZER AMPLIFIER For the cassette tape's signal.
IC6 RESET Resets the power.
lC7 RDS DECODER Decodes the radio data.
049 ACC DETECTION SW Outputs "H" during the ACC off.
050 BACK-UP DETECTION SW Outputs "H" when the back-up voltage is under 9.2V.
051,52 BACK-UP 5V DRIVER Works when back-up current exists.
053 P.ON 5V SW Works during the power on.
054,55 8V SW Works during the power on.
056,57 8V DRIVER Works during the power on.
058,59 ILLUMI +B SW Works during the power on.
060,61 ILLUMI +B DRIVER Works during the power on.
0150 E-VOL MUTE SW Works when the back-up current is detected
or the changer mute works or system u-com mute works.
0151 SVR FORCED DISCHARGE SW Works when the amplifier mute works.
0153 PRE OUT MUTE SW Works when the back-up current is detected
C) or the changer mute works or system u-com mute works.
0201 FM +B SW Works during FM mode.
0203 AM +8 SW Works during AM mode.
0260 MOTOR +B SW Works during the tape mode.
0261 MOTOR +B DRIVER Works when 0206 works.
0301 CD-CH RESET SW Works when the power is reset and the reset SW works.
0320 PANEL 5V SW Works when the back-up current exists and the panel
is attached on the unit.
0350 P.CON DRIVER SW Does not work during the power off and the ALL OFF.
0351 P.CON PROTECTION SW Works when the P.CON is short-circuited on the GND.
0352 P.CON PROTECTION INHIBIT SW Inhibits the protection SW in a moment during the P.CON on.
0353 P.CON DRIVER SW Does not work during the power off and the ALL OFF.
0450451 PRE OUT MUTE SW Works when the back-up current is detected
or the changer mute works or system u-com mute works.
0500 AUDIO OUTPUT BUFFER For RDS decoder.
0501.502 AFC TIME CONSTANT SW Works during receiving FM signal.
0503 NOISE BUFFER For noise level detection.

COMPONENT DESCRIPTION

SYNTHESIZER UNIT (X14-656x-xx)