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Fostex CR200 Service Manual page 57

Fostex cr200 cd recorder: supplementary guide
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PD4760A9 (IC351) on the SERVO UCOM BOARD ASSY
(1) General Function
1. Operation key input analysis
The key matrix method is adopted by 5 output x 4 input (20
key max.).
The KEYIN0 is also used as a test mode detection port when
powering on.
2. Remote controller input analysis
It corresponds to the two-fold cord complying to the universal
standards. [It receives CD-R remote commands (A3**,
AF**).]
3. Parallel remote controller input analysis
The CR200 receives the key input from DIN 8-pin connector
on the rear panel.
The input command can be distinguished by the analog data
(0 ~ 5V) applied to pin-28.
The table below indicates the relationship between the analog
data and key distinction.
Analog
Key
Data (V)
Distinction
4 ~ 4.5
STOP
4.5 ~ 5
REV TRACK
3.5 ~ 4
REC
2 ~ 2.5
MANUAL TRACK NO
3 ~ 3.5
Not used.
1.5 ~ 2
PLAY
1 ~ 1.5
FWD TRACK
2.5 ~ 3
PAUSE
(2) Function of terminal
N
. o
S
y
m
b
l o
1
F
P I
6
G
2
F
P I
5
G
3
F
P I
4
G
4
F
P I
3
G
5
F
P I
2
G
6
F
P I
1
G
7
F
P I
0
G
8
V
D
D
-
9
S
C
K
O
R
1
0
S
O
0
R
1
1
S
0 I
R
1
2
P
2
4
R
1
3
P
2
3
R
1
4
S
C
K
1
F
1
5
S
O
1
F
1
6
S
1 I
F
1
7
R
E
S
E
T
X
1
8
P
7
4
L
Pin No. of
DIN connector
8
7
6
5
4
3
2
1
T
r e
m
n i
l a
n I
t i
l a i
/ I
O
D
e
c s
i r
t p
o i
n
V
l o
a t
g
R
D I
6
O
L
R
D I
5
O
L
R
D I
4
O
L
R
D I
3
O
L
R
D I
2
O
L
R
D I
1
O
L
R
D I
0
O
L
O
L
S
C
K
O
H
S
O
O
L
I S
I
-
A
C
K
O
L
R
E
Q
O
L
S
C
K
/ I
O
H
S
O
O
L
I S
I
L
R
E
S
E
T
O
L
E
D
4
O
H
4. Display Output
FL display :
Dynamic scan method.
Sound quality improvment is realized by Display OFF.
LED :
Direct driving (REC indicator, manual, track
increment)
5. Communication with mechanical contorl microcomputer
Reading/Transferring of information on mechanical opeation,
disc and time information inside disc, skip information.
6. Communication with LSI (LC89585)
Reading of information such as C bit, U bit, Unlock.
Reading of data for level meter
Swiching and setting of digital interface
Controlling of digital circuit
Controlling of attenuator
Controlling of digital memory delay circuit
7. Controlling of Fs converter (PDC020A)
Controlling of Fs converter
Controlling of parallel output
8. Audio Circuit
Controlling of DAC, emphasis
Turning on/off of crystal
9. Rest controlling
10. Nominal mode system control
11. Test mode system control
e
F
L
r g
d i
o
u
p t
t u
5
F
L
r g
d i
o
u
p t
t u
6
F
L
r g
d i
o
u
p t
t u
7
F
L
r g
d i
o
u
p t
t u
8
F
L
r g
d i
o
u
p t
t u
9
F
L
r g
d i
o
u
p t
t u
1
0
F
L
r g
d i
o
u
p t
t u
1
1
C
o
n
n
e
c
e t
d
o t
V
D
. D
S
r e
a i
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f
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c
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S
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N
CR200
57
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