RXD-M51/M51MD
7
CIRCUIT DESCRIPTION
Back up power
supply (+5V)
X09, IC205
X33, IC1
MAIN u-COM
M30622MA-174FP
ENG_KANA
MD_MUTE
MUTE AND OR
(MAIN u-COM)
back up sw
MD SUPPLY VOLTAGE
CHANGE-OVER
TERMINAL
MD_RESET
MD-ST
SEARCH
LOAD_IN
DSCK
K_DATA
DSTB
MD_DATA
uart
rxd
txd
digital in
analog L/R in
analog L/R out
AD / DA
CONVERTER
MD
CONTROL
u-COM
DRIVE
UNIT
MD u-DOM
RF AMP
ENDEC / ATRAC
MD mecha. unit (MDM-98A)
2
2
2
2
2
1
3
1
uPD78058GC-B20
• DISPLAY CONTROL
• RF AMP CONTROL
• SIGNAL PROCESSING IC
CONTROL (TUNER)
• VOLUME, MUTE CONTROL
• INPUT SELECTOR CONTROL
back up voltage detection
5. Composition (MD section)
5-1 Microprocessor periphery block diagram
Pin No
Name
I/O
Description
1
PDOWN
O
MDM-98A POWER DOWN DETECTOR
2
SEARCH
O
CD SEARCH OUTPUT
3
LOAD IN
I
LOAD SWITCH INPUT
4
Avss
–
A/D POWER SUPPLY (CONNECTED TO GND)
5,6
–
–
NO USED
7
Avref1
–
D/A REFERENCE V5V)
8
RXD
I
COMMUNICATION FROM MAIN u-COM (UART RXD)
9
TXD
O
COMMUNICATION TO MAIN u-COM (UART TXD)
10
–
– NO
USED
11
MD_DATA
I
MD IC IN DATA (MDM-98A IN DATA)
12
K_DATA
O
MD IC OUT DATA (MDM-98A OUT DATA)
13
DSCK
O
MD IC CK (MDM-98A CLOCK)
14
DSTB
I
MD IC STB (MDM-98A STB)
15
COMM_ANS
I
NO USED
16
COMM_DIN
I
NO USED
17
COMM_DOUT
O
NO USED
18
COMM_CLK
I/O
NO USED
19
COMM_REQ
O
NO USED
20~31
–
–
NO USED
32
6.5/5.0V
O
MD LOAD VOLTAGE CHANGE-OVER DISC LOAD/EJECT : H
OTHER : L
33
Vss
–
u-COM(CONNECTED TO GND)
34~43
–
–
NO USED
44
INISW
I
INITIAL SW
45~58
–
–
NO USED
59
SRESET
O
NO USED
60
RESET
I
u-COM RESET
61
–
I
NO USED
62~66
–
–
NO USED
67
CE
I
u-COM CE
68
Vdd
–
u-COM POWER SUPPLY
69
X2
–
5MHz OSCILLATOR
70
X1
I
5MHz OSCILLATOR
71
IC
–
IC TERMINAL(CONNECTED TO GND)
72
NC
–
NO USED (OPEN)
73
GND
I
NO USED (CONNECTED TO GND)
74
Avdd
–
A/D POWER SUPPLY
75
Avref0
I
A/D REFERENCE VOLTAGE
76
BACKUP
I
BACKUP DETECTOR(A/D)
BACK UP : MORE THAN2.2V NO BACKUP:LESS THAN2.2V
77
AMUTE
O
ANALOG MUTE
H : MUTE ON
L : MUTE OFF
78
BACKUPSW
O
BACKUP DETECTOR SW H:ON(IN CASE of CE : HIGH) L:OFF(IN CASE of CE LOW)
79
MD_RESET
O
MD u-COM RESET H : NORMAL
L : MD u-COM RESET (LOW EDGE)
80
MD_ST
O
MD ON/CD SYNC
H : MD ON
L : BACKUP MODE
5-2 Pin description of MD u-COM: uPD78058GC-B20 (X33 :IC1)
6. Test mode
6-1 Test mode of the receiver
(1) Setting of the test mode.
While pressing the [Band] key, plug the AC power cord into an AC power outlet.
(2) Canceling of the test mode.
Unplug an AC power cord.
(3) Condition in test mode.
POWER • • • • • • ON
SELECTOR • • • TUNER [BAND]
FL, LED • • • • • • All the fluorescent display indicate and LEDs light. (The all illuminated state is cleared by pressing any main
unit key or remocon key.
EX. BASS • • • • • OFF
RXD-M51MD(K)
COVER1,1P(
98.12.10
19:11
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14
