3
KRC-208S/218,268/288,28MR
COMPONENT DESCRIPTION
SYNTHESIZER UNIT (X14-614x-xx)
REF. No.
FUNCTION
OPERATION
IC1
SYSTEM
µ
-COM
Controls system.
IC2
ELECTRIC VOLUME
Controls sound volume. Selects each source.
IC3
MUTE
Controls each mute output.
IC4
POWER IC
Amplifies power so that the speaker can drive audio signal.
IC5
EQUALIZER AMPLIFIER
Equalizer amplifier for cassette tape sound.
Q50
BACK-UP DETECTION
Stops when the back-up voltage comes less than 9.2V.
Q51,52
BACK-UP 5V AVR
Works when the back-up works.
Q53
P.ON DRIVER
Works when the power comes.
Q54,55
COM+B SW
Works when 5V comes.
Q56,57
COM+B AVR
Works when Q54 and Q55 work.
Q58,59
ILLUMIB SW
Works when the base level of Q58 comes "H".
Q60,61
ILLUMIB AVR
Works when Q58 and Q59 work.
Q150
ELECTRIC VOLUME MUTE SW
Works when the base level comes "H".
Q151
SVR DISCHARGE SW
Works when the base level comes "H".
Q153
PRE MUTE DRIVER
Works when the base level comes "L".
Q200
FM +B SW
Works when the base level comes "H" in FM mode.
Q201
FM +B DRIVER
Works when Q200 works.
Q202
AM +B SW
Works when the base level comes "H" in AM mode.
Q203
AM +B DRIVER
Works when Q203 works.
Q260
MOTOR +B SW
Works when the base level comes "H" in the tape mode.
Q261
MOTOR +B DRIVER
Works when Q260 works.
Q301
CHANGER RESET SW
Works when the base level comes "L".
Q320
PANEL 5V SW
Works when the base level comes "L".
Q350
P-CON. DRIVER
Works when Q353 works.
Q351,352
P-CON. PROTECTION
Works when P-CON output voltage goes down.
Q353
P-CON. SW
Works when the base level comes "H".
Q370
ANTENNA CONTROL DRIVER
Works when Q371 works.
Q371
ANTENNA CONTROL SW
Works when the base level comes "H" in the tuner mode.
Q450,451
PRE MUTE SW
Works when Q153 works.
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