Circuit Description - Kenwood DPC-X311 Service Manual

DPC-X311/X517/X612
1. Microprocessor : MN101C439(IC3)
1-1 Pin description
Pin No. Pin Name
1-4 COM 0-3
5 VLC3
6,7 VLC2,1
8 VDD
9 OSC2
10 SMCK
11 VSS
12 X1
13 XO
14,15 MMODO
16-18 ANO-2
19 KEY0
20 KEY1
21 BATT.
22 NC
23 RECHARGE DET
24 VREF+
25 REM DATA
26 POWER
27 REM STATUS
28 P03
29 SUBQ
30 SQCK
31 P06
32 NRESET
33 XRESET
34 STAT
35 MLD
36 MDATA
37 MCLK
38 BLKCK
39 IRQ1
40 DOOR
41 TEST
42 V CONT.
43 BBS
44-46 P42-P44
47 LMT
48,49 P46,P47
50 MUTE
51 LIGHT OUT
52 RECHARGE
53-55 P53,P54,P60
56 AC ADAPTER
57 HOLD
58 DASC
59 DASC1
60 DASC2
61 P66
62 DIG OUT
63-68 SEG12-SEG17
63-80 SEG0-SEG11

CIRCUIT DESCRIPTION

I/O Description
O LCD common output.
- GND
- VDD
- VDD
- Unused.
I External system clock(4.2336MHz).
- GND
- GND
- Unused.
- GND
- Unused.
I Remote control signal input.
I Key signal input.
I Battery level detection port.
- Unused.
I Rechargeable detection port.
- Power supply(+2.8v).
O Remote control data output.
O Power off control for CD servo driver.
- Unused.
- Unused.
I Sub code Q signal input port.
O Sub code clock output port.
- Unused.
I Reset signal input for microprocessor.
O Reset output port to DSP IC(IC4).
I Status signal input port.
O Command load signal output port of microprocessor.
O Command data signal output port of microprocessor.
O Command clock signal output port of microprocessor.
I Sub code clock signal input.
- Unused.
I Door switch detection input.
- Unused.
Power voltage change-over
O
H = DC/DC out 3.0V L = DC/DC out 2.7V
O Bass boost control output.
- Unused.
I Limit switch detection input port.
- Unused.
O Muting control port of audio signal.
- Unused.
I Detection port for rechargeable battery.
- Unused.
I Detection port for AC adapter.
I Detection port for hold switch.
I DASC switch detection port.
- Unused.
- Unused.
- Unused.
- Unused.
- Unused.
O Segment control output.
Active
H L
LOW BATT
POWER OFF
RESET
OPEN
BBS ON
ON = H
BAT CHG ON
BATTERY AC ADAP.
HOLD ON
4