Circuit Description - Kenwood LZ-800W Service Manual

LZ-800W
Hideaway Unit (X25-8630-61)
Ref. No. Parts No.
IC1 TA78DS05F
IC3 UPD784214GC077
IC4 PST9130NR
IC6 TDA8579T-T
IC8 TC4052BF
IC9 TDA8579T-T
IC11 TDA8579T-T
IC12 TC4052BF
IC13 BA7649F
IC14 NJM2267V
IC17 MM1234XFBE
IC18 NJM2267V
IC19 MM1228XFBE
IC22 UPC1830GT
IC24 TC7SH04F
IC400 TC7W74F
IC401 TDA4665T
IC402 MM1108XFFE
Q1 DTC114YUA
Q2 2SB1443
Q3 2SD2396F40
Q4 2SD2396F40
Q5 2SD1760
Q6 DTA124EUA
Q7 2SC4081
Q8 DTC124EUA
Q9 DTC323TU
Q11 DTC323TU
Q12 DTA124EUA
Q13 DTC124EUA
Q14 DTC124EUA
Q15 DTC124EUA
Q16 DTC124EUA
Q17 DTC124EUA
Q18 DTC124EUA
Q40 2SD1760
Q404 2SA1576A
Q405 2SA1576A
Q408 2SC4081
4

CIRCUIT DESCRIPTION

Description
5V Reg
Microprocessor
RESET IC
Isolation amplifier
Multiplexer
Isolation amplifier
Isolation amplifier
Multiplexer
Video signal switcher
Video amplifier
RGB SW
Video amplifier
Video signal switcher
Chroma processing
Inverter
D type flip flop
Video signal delay
Synchro sepalator IC
Switch
Switch
8V AVR
5V AVR
8V AVR
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Switch
5V AVR
Buffer
Buffer
Inverter
Processing Operation
+5V power supply for microprocessor
Controls functions
Controls reset operation
Audio input isolation amplifier (AV IN2)
Audio output selection (AV OUT)
Audio input isolation amplifier (NAVI)
Audio input isolation amplifier (AV IN1)
Audio output selection (SP OUT)
Video output signal selection
SYNC signal, R signal 75Ω, 6dB amp
R/G/B switch
G signal, B signal, 75Ω , 6dB amp
Video output signal selection (AV OUT)
Converts VIDEO signal to RGB signals
ACC detection inversion signal
Video clamp pulse generation
PAL 1H delay
NTSC,PAL discrimination (V SYNC)
PON+14V switch
+14V switch
Power supply for TV F/E, IF circuits
Video circuit power supply
Audio circuit power supply
Parking detection
ACC detection
RESET switching
RCA audio output signal mute
RCA audio output signal mute
RCA audio output signal mute
RCA audio output signal selection
RCA audio output signal selection
SP audio output signal selection
FM-TX ON/OFF
FM-TX power supply ON/OFF
SP audio output signal selection
Video switch, video buffer power supply
Video signal buffer
Video signal buffer
Blanking pulse inversion (For clamp pulse generation)