Component Description - Kenwood KRC-218 Service Manual

SYNTHESIZER UNIT (X14-614x-xx)
REF. No. FUNCTION
SYSTEM µ-COM
IC1
IC2 ELECTRIC VOLUME
IC3 MUTE
IC4 POWER IC
IC5 EQUALIZER AMPLIFIER
Q50 BACK-UP DETECTION
Q51,52 BACK-UP 5V AVR
Q53 P.ON DRIVER
Q54,55 COM+B SW
Q56,57 COM+B AVR
Q58,59 ILLUMINATION +B SW
Q60,61 ILLUMINATION +B AVR
Q150 ELECTRIC VOLUME MUTE SW
Q151 SVR DISCHARGE SW
Q153 PRE MUTE DRIVER
Q200 FM +B SW
Q201 FM +B DRIVER
Q202 AM +B SW
Q203 AM +B DRIVER
Q260 MOTOR +B SW
Q261 MOTOR +B DRIVER
Q301 CHANGER RESET SW
Q320 PANEL 5V SW
Q350 P-CON. DRIVER
Q351,352 P-CON. PROTECTION
Q353 P-CON. SW
Q370 ANTENNA CONTROL DRIVER
Q371 ANTENNA CONTROL SW
Q450,451 PRE MUTE SW
KRC-208S/218,268/288,28MR

COMPONENT DESCRIPTION

Controls system.
Controls sound volume. Selects each source.
Controls each mute output.
Amplifies power so that the speaker can drive audio signal.
Equalizer amplifier for cassette tape sound.
Stops when the back-up voltage comes less than 9.2V.
Works when the back-up works.
Works when the power comes.
Works when 5V comes.
Works when Q54 and Q55 work.
Works when the base level of Q58 comes "H".
Works when Q58 and Q59 work.
Works when the base level comes "H".
Works when the base level comes "H".
Works when the base level comes "L".
Works when the base level comes "H" in FM mode.
Works when Q200 works.
Works when the base level comes "H" in AM mode.
Works when Q203 works.
Works when the base level comes "H" in the tape mode.
Works when Q260 works.
Works when the base level comes "L".
Works when the base level comes "L".
Works when Q353 works.
Works when P-CON output voltage goes down.
Works when the base level comes "H".
Works when Q371 works.
Works when the base level comes "H" in the tuner mode.
Works when Q153 works.
OPERATION
3