Components Description - Kenwood KRC-2902YA Service Manual

SYNTHESIZER UNIT (X14-6872-73)
Ref.No. Function
SYSTEM µ-COM
IC1
IC2 E -VOLUME
IC3 M UTE LOGIC
IC4 POWER AMPLIFIER
IC5 EQUALIZER AMPLIFIER
IC6 RESET
Q49 A CC DETECTION SW
Q50 BACK-UP DETECTION SW
Q51,52 BACK-UP 5V DRIVER
Q53 P.ON 5V SW
Q54,55 8V SW
Q56,57 8V DRIVER
Q58,59 ILLUMI +B SW
Q60,61 ILLUMI +B DRIVER
Q150 E-VOL MUTE SW
Q151 SVR FORCED DISCHARGE SW Works when the amplifier mute works.
Q201 FM +B SW
Q203 AM +B SW
Q260 MOTOR +B SW
Q261 MOTOR +B DRIVER
Q301 CD-CH RESET SW
Q320 PANEL 5V SW
Q350 P.CON DRIVER SW
Q351 P.CON PROTECTION SW
Q352 P.CON PROTECTION INHIBIT SW Inhibits the protection SW in a moment during the P.CON on.
Q353 P.CON DRIVER SW

COMPONENTS DESCRIPTION

Controls the unit.
Controls the volume and selects source.
Controls the mute output.
For the speaker output.
For the cassette tape's signal.
Resets the power.
Outputs "H" during the ACC off.
Outputs "H" when the back-up voltage is under 9.2V.
Works when back-up current exists.
Works during the power on.
Works during the power on.
Works during the power on.
Works during the power on.
Works during the power on.
Works when the back-up current is detected or the changer mute works or system µ-com mute works.
Works during FM mode.
Works during AM mode.
Works during the tape mode.
Works when Q206 works.
Works when the power is reset and the reset SW works.
Works when the back-up current exists and the panel is attached on the unit.
Does not work during the power off and the ALL OFF.
Works when the P.CON is short-circuited on the GND.
Does not work during the power off and the ALL OFF.
KRC-2902YA/G
Operation
3