SYNTHESIZER UNIT (X14-6xxx-xx)
REF.
No. FUNCTION OPERATION
IC1 -COM Controls system.
IC2 ELECTRIC VOLUME Switches each source, decodes FM stereo signal, controls sound.
IC4 POWER IC Amplifies power so that the speaker can drive audio signal.
IC5 EQUALIZER AMPLIFIER Amplifies and equalizes the cassette head output signal (120 sec).
IC6 SUB MOTOR CONTROLLER Controls sub motor's loading and eject modes.
IC8 RDS DECODER Decodes RDS signal from tuner MPX signal.
IC9 -COM RESET Resets -COM after detecting the back-up voltage comes
less than 3V.
IC10 MUTE DRIVER Mutes power IC (IC4) and E-volume (IC2) when the back-up is
detected and -COM mute signal is output.
Q1,2 BACK-UP 5V AVR Usually output 5V when battery is connected.
Q3 SW 5V Outputs 5V when -COM makes Q3's base level "L".
Q4,5 SW 14V Q4's corrector outputs the back-up 14V when -COM makes Q5's
base level "H".
Q6,7 8V AVR Output 8V.
Q8,9 MAIN MOTOR SW Output 14V when -COM makes Q9's base level "H".
Q10-13 ILLUMINATION AVR Q12's corrector outputs 10.3V when -COM makes Q11's
base level "H".
Q14 P-CON. START-UP Cancels Q15's protection circuit effected by C9 time constant and
Q14's inner base resister.
Q15 P-CON. PROTECTION CIRCUIT Stops output signal, and makes Q16's base level "H" when P-CON
output comes GND shorted.
Q16,17 P-CON. SW Outputs the back-up 14V when Q17's base level comes "H".
Q18 ACC DETECTION Corrector level comes "L" when ACC comes "ON".
Detection voltage :8.95V.
Q19 BACK-UP DETECTION Corrector level comes "L" when the back-up comes "ON".
Detection voltage :9.0V.
Q20 -COM RESET Resets -COM when Q20's base level comes "H".
Q21 DSI Indicates when Q21's base level comes "H".
Q51 POWER AMPLIFIER SVR CONTROLLER SVR level comes "L" when -COM makes Q51's base level "H".
Q52 PREOUT MUTE CONTROLLER Mutes preout sound when Q52's base level comes "L".
Q53 ELECTRIC VOLUME MUTE Mutes E-volume (IC2) signal when Q53's base level comes "H".
Q54,55 AFC Switches AFC time constant.
Q56 MPX BUFFER For the front-end MPX output buffer (Emitter follower).
Q57-60 PREOUT MUTE CONTROLLER Mutes preout sound when Q52's base level comes "L".
Q61 FM+B SW "ON" when Q61's base level comes "H".
Q62 AM+B SW "ON" when Q62's base level comes "H".
Q63 FM+B SW "ON" when Q61's base level comes "H".
Q64 AM+B SW "ON" when Q62's base level comes "H".
Q65 PANEL SW "ON" when Q65's base level comes "L" (Panel OFF).
Q67 NOISE BUFFER For E-volume (IC2) output buffer (Emitter follower).
