Kenwood KRC-691, Руководство по обслуживанию

Страница: 3 / 20

KRC-765/691/691Y
3
COMPONENT DESCRIPTION
●
SWITCH UNIT (X16-16XX-XX)
REF.No. FUNCTION OPERATION
IC1 LCD driver
IC2 Remocon IC
Q1 Key scan start SW ON when the base goes "L".
Q3 Key illumination SW (RED) ON (Key Illmination Red) when the base goes "H".
Q4 Key illumination SW (GREEN) ON (Key Illmination Green) when the base goes "H".
Q5,D26 VLCD AVR AVR, ON when the base goes "9.1V".
Q6 Remocon IC VDD suply SW Supply of Remocon IC VDD when the base goes "H".
Q7 Dimmer control LCD Back Light Control (PWM Control)
●
SYNTHESIZER UNIT (X14-68XX-XX)
Component Purpose • Function Operation • Conditions • Compatibility
IC1 SYSTEM µ-COM
IC2 E-VOL, N.C. NPX
IC3 Mute logic circuit 4 input NOR gate x 4
IC4 Power IC
IC7 RDS Decoder
IC8 Reset IC "L" detection voltage: 3.0 V or less
IC9 Equalizer amplifier DOLBY B
IC10 Sub motor driver
IC11 EEPROM
Q1 Audio mute SW Front L-channel is muted when base goes "H".
Q2 Audio mute SW Front R-channel is muted when base goes "H".
Q3 Audio mute SW Rear L-channel is muted when base goes "H".
Q4 Audio mute SW Rear R-channel is muted when base goes "H".
Q11,Q12 B.U. 5V AVR Darlington connection
Q13 SW 5V ON when base goes "L".
Q14,Q15 SW 14V
Audio 8V ON/OFF SW
Q15 is turnd ON when Q14's base goes "H".
Q16,Q17 AUDIO 8V AVR Darlington connection
Q18,Q19 Main motor SW Q19 is turnd ON when Q18's base goes "H".
Q20,Q21 ILL power ON/OFF SW Q21 is turnd ON when Q20's base goes "H".
Q23 ILL AVR Inverted darlington connection
Q31 Dimmer control SW Small light detection when base goes "H".
Q32,Q33 Power antenna SW Q33 is turnd ON when Q32's base goes "H".
Q34,Q37 Power control SW Q34 is turnd ON when Q37's base goes "H".
Power control circuit
When the output voltage decrease is detected, Q37 is turned off to protect the output.
Q35,Q36
output protection
When the power control switch is turned on, Q35 protects the system from
misoperation.
Q38 B.U detection
"L" when B.U is present.
"H" when B.U is absent or when momentary power down detction.
Q39 ACC detection "L" when ACC is present.
Q42 Mute driver
For driving the audio mute switch.
ON when the base goes "L".
Q43 MUTE SW for E-VOL. Turns on when base goes "L" and E-VOL is muted.
Q44 Noise buffer
Q51,Q52 FM+B SW Q52 is turnd ON when Q51s base goes "H".
Q53,Q54 AM+B SW Q54 is turnd ON when Q53s base goes "H".
Q55 Composite signal buffer
Q61 PANEL 5V SW ON when the base goes "L".
Q71 MSTC SW ON when the base goes "H".
Q72 Sub motor AVR 7.3V output when AUDIO 8V is turned on.
Q82 EJECT ILL/DSI SW ON when the base goes "L".