Hitachi D-RV7 Servicehandbuch Seite 13
Inhaltsverzeichnis
1. gPD554C-109M (counter microcomputer) terminal function table
Terminal
Terminal
Function
No.
name
name
Internal
clock
oscillation.
1
CLI
CLI
Input of data for display tube control.
PCO
D3
2
PCl
02
Taking 8-bit data synchronized with the PDO input clock into PCO
3
4
Dl
Relationship
between input data and display.
PC3
DO
5
At
PDO
— "L"
level
PDO
D.CLOCK
6
03
02
o
o
1
1
1
1
I
indicates counting up and "O" counting down, respectively,
ter control
data.
Anything.
PDI
Segment control data output.
7
Relationship
between output data and display.
8
PD2
b
9
PD3
Segment
PEO
10
Display
11
PEI
12
PE2
e
PE3
d
13
3
5
7
9
14
Vss
Vss
+8 (IOV)
TEST
TEST
15
16
•
Grid scan data output.
Relationship
between scan output and display digits.
PFI
17
18
2G
Display
digit
IG
19
Grid
IG
2G
3G
4G
Vacant
terminals.
20
PGO
NC
NC
p AO
21
22
PAI
NC
Tape counter reset key input.
23
p A2
C.RESET
• O O
display at ' 'L" level input.
— 23 —
D-RV7
Functions
PC3.
H" level
At
PDO
"
Display
DS
D2
Dl
DO
15)
R-OC(— '5)
End
o
o
I
o
0
R End
1
1
9-oc(— *'5)
Counter
R-OO(- '5)
No change
o
o
o
o
(Only tape
counter
is
cleared
in the tape coun-
Segment
b
d
b
d
f
a
c
e
a
c
Display
1
1
1.
1
1
O
o
O
O
1
1
1
1
1
1
o
1
o
1
1
1
1
1
o
1
1
1
1
1
1
1
1
o
o
o
o
O
1
1
1
o
o
1
1
1
o
1
1
1
1
1
1
o
1
1
1
1
1
1
1
o
1
1
1
1
1
4th digit
3rd digit
2nd digit
1st digit
o
o
o
1
o
D-RV7
Function
Terminal
Terminal
No.
name
name
NC
24
PA3
REEL
25
INT
PULSE
RESET
26
RES
•
VGG
VGG
27
CLO
28
CLO
2. gPD553C-229N (microcomputer) terminal function table
Terminal
Terminal
Function
No.
name
name
1
CLI
CLOCK
2
PCO
3
PCl
KI
PC2
K2
4
5
K3
f
g
1
REEL
6
1
PULSE
1
1
1
1
1
1
7
RES
RESET
1
1
8
PDO
LEADER
•
9
PDI
MUSIC
10
PD2
MULTI
11
PD3
PROT/
HEAD
12
PEO
LINE
MUTE
Functions
V acent
term inal
Reel block pulse input for detection Of tape end.
Tape counter counts up and down by this pulse.
(±l count at input of 8 pulses)
Counter is cleared when tape end is detected during REW.
RESET pulse input
GND (earth)
Internal
clock
oscillation
Functions
LC for clock oscillation
is externally
attached.
Input terminals for detection
of mechanism position through
on mechanism.
Positions of II
modes are available through
"H"
and ' 'L" of each port. These modes
are encoded
to control
the mechanism.
Reverse
pAUSE
PLAY
STOP
SEARCH
REW
KO
o
o
1
o
KI
O
o
K2
o
1
1
O
o
o
K3
1
1
1
o
o
Code
A
E
c
D
9
1
3
Input terminal of reel pulse for detection of tape end.
Tape end processing is performed
when pulse input is lost for 3 seconds during PLAY
or REC/PLAY,
and for 1 second during F.F/REW or F.F/REW SEARCH.
Rewinding
from overrun at selection of music and the multi-repeat
formed with the pulse count of this input terminal.
Microcomputer
reset terminal.
The microcomputer
is reset when the "H"
put for at least 4 machine
cycles (IOgsec).
Input terminal for detecting the leader tape section in tape.
Detection
of the leader tape begins 10 seconds and 1 second, respectively, after the
tape started running during PLAY and REC/PLAY,
and during SEARCH.
For tapes without
leader tapes, the tape is run up to the tape end. At the tape end,
the ''H"
level is output
from
the PH2 terminal,
and reversing takes place through
detection
of the mode
switch.
Reversing takes place when the "L"
level is input into this input terminal.
Input terminal for detection of the music signal
"L"
Multi-repeat
key input
terminal.
Key input is assumed at the "L"
level input.
Detection
of the REC PROTECT. switch is performed
from the PE3 terminal,
and detection
of the direction
of the head is performed when
the "L"
level is output from the same terminal.
When the "H"
level is input
into this input
terminal,
REC, and the direction
of the head becomes forward.
Line amplifier
muting
control
output
terminal
—24—
rotary switch mounted
Forward
PAUSE
PLAY
SEARCH
1
o
o
1
O
o
1
1
o
o
O
O
7
6
4
5
function
are per-
level is in-
levels.
when the "H"
level is output
REC PROTECT
is capable of
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