SYNTHESIZER UNIT (X14-613x-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.
IC6
RESET
Resets power supply.
IC7
RDS DECODER
Decodes RDS signal.
Q49
ACC DETECTION SW
Works when ACC operation stops.
Q50
BACK-UP DETECTION SW
Works when the back-up voltage comes less than 9.2V.
Q51,52
BACK-UP 5V DRIVER
Works when the back-up works.
Q53
P.ON 5V SW
Works when the power comes.
Q54,55
8V SW
Works when the power comes.
Q56,57
8V DRIVER
Works when the power comes.
Q58,59
ILLUMINATION +B SW
Works when the power comes.
Q60,61
ILLUMINATION +B DRIVER
Works when the power comes.
Q150
ELECTRIC VOLUME MUTE SW
Works when the back-up voltage detection or the changer mute or
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 voltage detection or the changer mute or
µ-com mute works.
Q201
FM +B SW
Works when FM mode is being selected.
Q203
AM +B SW
Works when AM mode is being selected.
Q260
MOTOR +B SW
Works when TAPE mode is being selected.
Q261
MOTOR +B DRIVER
Works when Q260 works.
Q301
CHANGER RESET SW
Works when power supply is being reset and IC6 works.
Q320
PANEL 5V SW
Works when the back-up works and panel is on the unit.
Q350
P-CON. DRIVER
Stops during POWER OFF and ALL OFF modes.
Q351
P-CON. PROTECTION SW
Works when P-CON is being short-circuited on GND.
Q352
P-CON. PROTECTION INHIBIT SW Inhibits protection SW function when P-CON works momentary.
Q353
P-CON. SW
Stops during POWER OFF and ALL OFF modes.
Q450,451
PRE OUT MUTE SW
Works when the back-up voltage detection or the changer mute or
µ-com mute works.
Q500
AUDIO OUT BUFFER
For RDS decorder (IC7).
Q501,502
AFC TIME CONSTANT SW
Works when receiving FM signal. Stops when seeking FM signal.
Q503
NOISE BUFFER
For noise level detection.
KRC-13R,178R,23R,278R,280R
3
COMPONENT DESCRIPTION
