Component Description; Switch Unit (X16-16Xx-Xx) - Kenwood KRC-665R Service Manual

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SYNTHESIZER UNIT (X14-68XX-XX)
Component Purpose • Function
IC1 SYSTEM µ-COM
IC2 E-VOL, N.C. NPX
IC3 Mute logic circuit
IC4 Power IC
IC7 RDS Decoder
IC8 Reset IC
IC9 Equalizer amplifier
IC10 Sub motor driver
IC11 EEPROM
Q1 Audio mute SW
Q2 Audio mute SW
Q3 Audio mute SW
Q4 Audio mute SW
Q11,Q12 B.U. 5V AVR
Q13 SW 5V
Q14,Q15 SW 14V
Q16,Q17 AUDIO 8V AVR
Q18,Q19 Main motor SW
Q20,Q21 ILL power ON/OFF SW
Q23 ILL AVR
Q31 Dimmer control SW
Q32,Q33 Power antenna SW
Q34,Q37 Power control SW
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L 13942296513
Power control circuit
Q35,Q36
output protection
Q38 B.U detection
Q39 ACC detection
Q42 Mute driver
Q43 MUTE SW for E-VOL.
Q44 Noise buffer
Q51,Q52 FM+B SW
Q53,Q54 AM+B SW
Q55 Composite signal buffer
Q61 PANEL 5V SW
Q71 MSTC SW
Q72 Sub motor AVR
Q82 EJECT ILL/DSI SW

SWITCH UNIT (X16-16XX-XX)

Component Purpose • Function
IC1 LCD driver
IC2 Remocon IC
Q1 Key scan start SW
Q2 Remocon IC VDD supply SW
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Q3 Key Illumination SW (Green)
Q4 Key Illumination SW (Red)
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KRC-665R/591/591V/591Y/591YV

COMPONENT DESCRIPTION

4 input NOR gate x 4
"L" detection voltage: 3.0 V or less
DOLBY B
Front L-channel is muted when base goes "H".
Front R-channel is muted when base goes "H".
Rear L-channel is muted when base goes "H".
Rear R-channel is muted when base goes "H".
Darlington connection
ON when base goes "L".
Audio 8V ON/OFF SW
Q15 is turnd ON when Q14's base goes "H".
Darlington connection
Q19 is turnd ON when Q18's base goes "H".
Q21 is turnd ON when Q20's base goes "H".
Inverted darlington connection
Small light detection when base goes "H".
Q33 is turnd ON when Q32's base goes "H".
Q34 is turnd ON when Q37's base goes "H".
When the output voltage decrease is detected, Q37 is turned off to protect the output.
When the power control switch is turned on, Q35 protects the system from
misoperation.
"L" when B.U is present.
"H" when B.U is absent or when momentary power down detction.
"L" when ACC is present.
For driving the audio mute switch.
ON when the base goes "L".
Turns on when base goes "L" and E-VOL is muted.
Q52 is turnd ON when Q51s base goes "H".
Q54 is turnd ON when Q53s base goes "H".
ON when the base goes "L".
ON when the base goes "H".
7.3V output when AUDIO 8V is turned on.
ON when the base goes "L".
ON when the base goes "L".
Supply of Remocon IC VDD when the base goes "L".
ON (Key Illmination Green) when the base goes "H".
ON (Key Illmination Red) when the base goes "H".
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Operation • Conditions • Compatibility
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Operation • Conditions • Compatibility
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