Microcomputer's Terminal Description - Kenwood KDC-M7024 Service Manual

Ref. No. Application/Function
Q53 Noise buffer
Q54 E-vol mute SW
Q55~60 Pre-out mute SW
Q63 E2P 5V SW
Q102, 103 AM+B SW
Q104 Composite signal buffer for RDS

MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM MICROCOMPUTER : UPD703030GC014 (X25-966 : IC1)
Pin No. Pin Name I/O
1 PLL_DATA I/O
2 AM+B I/O
3 (FM+B) O
4 V_ILL PAN_E2P DATA I/O
5 V_ILL PAN_E2P CLK I/O
6 EVDD -
7 EVSS -
8 AFS O
9 BEEP O
10 REMO I
11 P_MUTE O
12 (SVR) O
13 IC2_SDA I/O
14 IC2_CLK I/O
15 P_STBY O
16 P_CON I/O
17 DIMMER_CONT O
18 TEST -
19 NC O
20 MUTE O
21 PRE_MUTEL O
22 PRE_MUTER O
COMPONENTS DESCRIPTION
When a base gose Hi, mute SW is turned on.
When a base gose Hi, Pre-out is muted.
When Q63'base gose Lo, E2P 5V is out.
When Q102'base gose Hi, AM+B is out.
Module Purpose / Description
Tuner Data output/input with F/E.
Power supply AM+B.
Power supply FM+B (S01 F/E only).
To panel V-ILL D/A converter (V-ILL, LCD), E2PROM data.
To panel V-ILL D/A converter (V-ILL, LCD), E2PROM clock.
Tuner Noise detection time constant switching.
Audio Beep output.
Extra Remote control input (Panel, External display).
Audio Power IC MUTE output.
Audio Power IC SVR discharge circuit control.
CD CD mechanism data line.
Audio IC2 data line.
Extra ROM correction data line.
CD CD mechanism clock line.
Audio IC2 clock line.
Extra ROM correction clock line.
Audio Power IC STBY output.
Extra Power control.
To panel Dimmer control (W-LED only).
Extra NC (MP3 mechanism model).
Audio Mute output.
Audio PREOUT (L ch) mute.
Audio PREOUT (R ch) mute.
KDC-M7024/MP822
Operation/Condition/Compatibility
Truth table Processing Operation
AM operation : H
FM operation : H,
Last FM : H (With RDS, RBDS model)
FM seek, AF search : L, Receiving : H, Auto 0 : L
Power OFF : L, All OFF : L, TEL mute : L
Power OFF momentary power dropped
: H (5 second) and then L
Power IC ON : H, Power IC OFF : L, All OFF : H
Power ON : H, Power OFF : Hi-Z, All OFF : Hi-Z
Dimmer : Pulse control,
Frequency : 1kHz, Normally : H
Connect to GND.
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Output : L
ON : OPEN, OFF : L
M MUTE L is L : L (CD), Momentary power
dropped : L, 2 zone, NAVI interrupt : Fixed H
M MUTE R is L : L (CD), Momentary power
dropped : L, 2 zone, NAVI interrupt : Fixed H
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