DMF-9020/9020(S)/MD-2070
8
CIRCUIT DESCRIPTION
4. Test mode of the unit
4-1 Setting of the test mode
While pressing the [REC/INPUT] key, plug the AC power
cord into the AC wall outlet.
4-2 Contents of the test mode
Choose the 3 mode by TIMER switch position below.
NONE means none mode.
(1) [ INSPECTION ] mode
•
ENGLISH
display (2secs)
• " NIAGARA TEST " display
Dot
: Niagara
Segment
: All lighting
• Push a key, then cancel " NIAGARA TEST "
Display [ KEY 028 ] into the KEY-TEST mode.
Push a key, then display [ KEY
] .
(2) [ ERROR RATE ] mode
• Function of the key
• Function of the key
5. Microprocessor reset
The microprocessor can be initialized while pressing the
[EJECT] key, plug the AC power cord into the AC wall
outlet.
6. Mechanism test mode
Refer to 1050MD/DM-5090/MD-9090 service manual (B51-
5387-00), if you see this test mode.
TIMER SW
Mode
(1)
REC
INSPECTION
(2)
PLAY
ERROR RATE
OFF
NONE
Key
Mode
REC/INPUT
KEY-TEST
EDIT
NIAGARA TEST
TITLE INPUT
None all lighting
Key
Function
PLAY
CPLAY (MID)
REC
CREC (MID)
STOP
STOP CPLAY, CREC
(2time push) ERROR RATE
Pin No.
Port Name
I/O
Description
21
CS (SRAM)
O
SRAM control. chip select
H : POWER DOWN
22
WR
–
SRAM control. write strobe signal output
23
RD
–
SRAM control. read strobe signal output
24-28
NC
O
no use
29-35
A14-8
–
SRAM control. address bus
36-42
AD7-1
–
SRAM control. address/data bus
43
AD0
–
SRAM control. address/data bus
L : POWER DOWN
44
ASTB
–
SRAM control. address strobe signal output
45
VSS
–
Microprocessor GND
46
TEST
–
Microprocessor TEST
47,48
NC
O
no use
49
MENA
O
Mechanism-microprocessor. enable
50
MRXD
–
Mechanism-microprocessor. data in line (UART)
51
MTXD
O
Mechanism-microprocessor. data out line (UART)
52-54
NC
O
no use
55
VDD
–
Microprocessor power supply (+)
56-61
NC
I
no use
62
CTR_JIS
I
Cyber titler. for JIS code
H : JIS
63
TXT_JIS
–
CD TEXT. for JIS code
H : JIS
64
AVDD
–
A/D power supply
65
AVref1
–
A/D reference voltage input port (+5V)
66
AVSS
–
A/D GND
67,68
NC
O
no use
69
AVref2
–
D/A reference voltage input port (+5V)
70
AVref3
–
A/D reference voltage input port (GND)
71,72
NC
I
no use
73
DQSY
–
Text data read permit
L :
interrupt
74-76
NC
I
no use
77
CLOCK
I
IBM key board I/F clock line
L :
interrupt
78
SRDT
I
Text data read line
79
TRXD
I
Cyber titler. data in line (UART)
80
TTXD
O
Cyber titler. data out line (UART)
AD1855
SERIAL DATA
INTERFACE
16-/18-/20-/24-BIT
DIGITAL
DATA INPUT
25 ~ 27
3
19
~ 5
20 ,
1
9
8 ,
6
2
7
11 ,
24
23
18
22
12 ,
,
,
10
28
14
13 16
17
15
21
SERIAL
MODE
DIGITAL
GND
ANALOG
GND
RD/RST
MUTE
DE-EMPHASIS
ANALOG
SUPPLY
ZERO
FLAG
ANALOG
OUTPUTS
384/256
96/48Fs
CLOCK
DIGITAL
SUPPLY
CONTROL DATA
INPUT
CLOCK
IN
X2MCLK
ATTEN/
MUTE
8x
INTERPOLATOR
MULTIBIT SIGMA-
DELTA MODULATOR
OUTPUT
BUFFER
CLOCK
CIRCUIT
VOLTAGE
REFERENCE
SERIAL CONTROL
INTERFACE
OUTPUT
BUFFER
DAC
DAC
MULTIBIT SIGMA-
DELTA MODULATOR
8x
INTERPOLATOR
ATTEN/
MUTE
3. D/A converter : AD1855 (X25 : IC7)
Block diagram (No. of : pin No.)
DMF-9020(K)
INT1,1P(
98.11.26
5:24
PM
y[W
15
