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KDC-7027/7027Y
5
COMPONENTS DESCRIPTION
Ref No.
Application / Functions
Operation / Condition / Compatibility
Q32
BU detector
When Q32 base level goes H, Q32 turned ON
Q33
ACC detector
When Q33 base level goes H, Q33 turned ON
Q51,52
Muting driver
When base level goes L, muting driver is turned ON
Q55,56,59,60
Pre-out muting SW
When base level goes H, Pre-output is muted
Q63
E2P 5V SW
When Q63 base level goes L, E2P 5V is out for E2P ROM
Q102,103
AM +B SW
When Q102 base level goes H, AM +B is out to tuner unit
Q104
Buffer
Composite signal buffer for RDS
●
SYSTEM MICROPROCESSOR : UPD703030GC043 (X34-304 : IC1)
Pin No.
Pin Name
I/O
Description / Processing Operation
Fig.
1
PLL DATA
I/O
Data input/output terminal for Tuner front-end
2
AM+B
I/O
AM+B (AM operation : H)
3
(FM+B)
O
FM+B (FM operation : H, Last FM : H with RDS,RBDS model)
4
PAN E2P DATA
I/O
Variable illumination D/A converter, E2PROM DATA terminal
5
PAN E2P CLK
I/O
Variable illumination D/A converter, E2PROM CLK terminal
6
EVDD
-
VDD 5V
7
EVSS
-
GND
8
AFS
O
Time constant switching for noise detection (FM seek, AF search, AUTO 0 : L, Receiving : H)
9
BEEP
O
BEEP audio output terminal
10
REMO
I
Remote control input terminal
Audio power IC muting control terminal (POWER OFF, ALL OFF, TEL MUTE : L)
Audio power IC SVR discharge circuit control terminal
CD mechanism, IC2, IC5, ROM correction DATA line
CD mechanism, IC2, IC5, ROM correction CLOCK line
Audio power IC Stand-by terminal (POWER IC ON, ALL OFF : H, POWER IC OFF : L)
Power control terminal (POWER ON : H, POWER OFF, ALL OFF : Hi-Z)
Dimmer control terminal (W-LED only : Pulse control F=1KHz, Normal : H)
NC (GND)
Destination select terminal
20
MUTE
O
MUTE output terminal (ON : OPEN, OFF : L)
21
PRE MUTER
O
PREOUT (Rch) muting control terminal
22
PRE MUTEL
O
PREOUT (Lch) muting control terminal
23
BU DET
I
Momentary power dropped detection terminal (No Backup, Momentary power dropped : H, Backup : L)
24
ACC DET
I
ACC detection terminal (With ACC : L, Without ACC : H)
25
SW5V
I/O
SW5V control terminal (OFF : H, ON : L)
26
EXT AMP CONT
O
External amplifier control terminal
MICROCOMPUTER’S TERMINAL DESCRIPTION
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