Circuit Description - Kenwood DPC-181 Service Manual

1. Microprocessor : (MN171603 H3)
1–1 Pin description
Pin No. Pin name
1, 2 –
3 AVSS
4 BBS
5 DATA
6, 7 –
8 KEY
9 HOLD
10 ESP
11 LOW BATTERY
12 AVDD
13~15 VLC1~VLC3
16~19 COM1~COM4
20~33 SEG0~SEG13
34, 35 SEG14, 15
36 MODE-M
37 D-CNT
38 MODE-A
39 MODE-B
40 STDBY
41~44 –
45 DOOR OPEN
46 PSET
47 BTCHK
48~51 –
52 POWER
53 BAT
54 D MUTE
55 SBCK
56 FCLK
57 FLAG
58 IPFLAG
59 –
60 STAT
61 SENSE
62 TLOCK
63 FLOCK
64 MCLK
65 MDATA
66 MLD
67 –
68 RST
69 X1
70 X2
71 Vss
72 –
73 SMCK

CIRCUIT DESCRIPTION

I/O Function description
I NOT USED
– GND
O BBS CONTROL SIGNAL OUTPUT
O REMOTE CONTROL SIGNAL OUTPUT
NOT USED
I KEY INPUT
I HOLD ON/OFF CONTROL
I ESP ON/OFF CONTROL
I BATTERY VOLTAGE DETECTION
– SUPPLY VOLTAGE
– LCD DRIVER BIAS CONTROL
O LCD COMMON SIGNAL OUTPUT (COMMON1~4)
O LCD SEGMENT SIGNAL OUTPUT (SEG0~SEG13)
O NOT USED
I MEMORY SELECT
I DIGITAL OUT CONTROL
I USE CUE/REV MODE
I NOT USED
O NOT USED
– NOT USED
I DOOR SWITCH DETECTION
I PICKUP INITIAL POSITION
I BATT. VOLTAGE DIRECTION.
I NOT USED
O POWER SUPPLY CONTROL.
O BATTERY CONTROL OUTPUT
O MUTE CONTROL
O SUB CODE READ TIMING CLOCK FOR MN662740RE
I FRAME CLOCK SIGNAL from MN662740RE
I FLAG SIGNAL INPUT from MN662740RE
I CORRECTION = "H"
I GND
I STATUS SIGNAL from DSP
I SENSITIVE SIGNAL from DSP
I TRACKING SERVO
I FOCUSING SERVO
O COMMAND CLOCK for MN662740RE
O COMMAND DATA for MN662740RE
O COMMAND DATA LATCH (LOAD) for MN662740RE
O NOT USED
I SYSTEM RESET INPUT
I GND
O NOT USED
– GND
O NOT USED
I EXTERNAL SYSTEM CLOCK = 4.2336MHz
DPC-181/183/381/382/383
Active
ON = "H"
ON = "H"
ON = "L"
LOW BATT. = "H"
4M = "H" OTHER = "L"
OUT = "H" (ESP OFF)
OPEN = "H"
CHARGING = "H"
ON = "H"
IN = "L"
IN = "L"
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