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Ref No.
Application / Functions
Q27
BU detector
Q29
ACC detector
Q30,31
Muting driver
Q201
Buffer
Q202
E-VOL muting SW
Q203~208
Pre-out muting SW
Q210
AGC
Q303,304
AM +B SW
Q305
Buffer
Q501
E2P 5V SW
Q502,503
Panel 5V SW
Q603
SW
MICROCOMPUTER'S TERMINAL DESCRIPTION
SYSTEM MICROPROCESSOR : UPD703030GC041 (X34-303 : IC1)
Pin No.
Pin Name
I/O
1
PLL DATA
I/O
2
AM+B
I/O
3
(FM+B)
4
PAN E2P DATA
I/O
5
PAN E2P CLK
I/O
6
EVDD
7
EVSS
8
AFS
9
BEEP
10
REMO
11
P MUTE
12
SVR
13
IC2 SDA
I/O
14
IC2 CLK
I/O
15
P STBY
16
P CON
I/O
17
WOW MODE2
COMPONENTS DESCRIPTION
When Q27 base level goes H, Q27 turned ON
When Q29 base level goes H, Q29 turned ON
When base level goes L, muting driver is turned ON
Noise detect buffer amp
When Q202 base level goes H, muting SW is turned ON
When base level goes H, Pre-output is muted
For AGC for spectrum analyzer
When Q303 base level goes H, AM +B is out to tuner unit
Composite signal buffer for RDS
When Q501 base level goes L, E2P 5V is out for E2PROM
When Q503 base level goes H, Panel 5V is out
When Q603 base level goes H, Q603 is turned ON
Data input/output terminal for Tuner front-end
AM+B (AM operation : H)
O
FM+B (FM operation : H, Last FM : H with RDS, RBDS model)
Variable illumination D/A converter, E2PROM DATA terminal
Variable illumination D/A converter, E2PROM CLK terminal
-
VDD 5V
-
GND
O
Time constant switching for noise detection (FM seek, AF search, AUTO 0 : L, Receiving : H)
O
BEEP audio output terminal
I
Remote control input terminal
O
Audio power IC muting control terminal (POWER OFF, ALL OFF, TEL MUTE : L)
O
Audio power IC SVR discharge circuit control terminal
CD mechanism, IC2, IC5, ROM correction DATA line
CD mechanism, IC2, IC5, ROM correction CLOCK line
O
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)
O
WOW control terminal
KDC-MP925/W8027
Operation / Condition / Compatibility
Description / Processing Operation
Fig.
1
5
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