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KRC-999 II
CIRCUIT DESCRIPTION
3-2. Terminal description table
Pin No.
Symbol
Terminal Name
Description
1~4
KO~K3
Key return signal inputs
Input terminals for return signal from the Dynamic key matrix.
Each terminal is connected to a 3.3k pull-down resistor. Active 'L"'.
5
NR
NR ON/OFF signal output
Dolby B or C ON/OFF control signal output, Active 'L".
6
DOLBY B/C
Dolby B/C switching
Dolby B/C switching signal output. "H" for C, "L" for B.
7
dbx
dbx ON/OFF signal
dbx ON/OFF control signal. ""L'' for ON, "H" for OFF.
8
METAL
NORMAL/METAL
Output for switching the time constant of the tape reproduce equalizer.
:
switching signal
"H" for NORMAL,
"'L" for High position.
9
MAIN. M.O
Mechanism main motor
Controls the reverse rotation of the main motor of the mechanism.
reverse rotation control
Active ''H".
10
MAIN. M.@
Mechanism main motor
Controls the forward rotation of the main motor of the mechanism.
forward rotation control
Active H"'.
11,12
NC
NC
Not connected,
13
SLIDE MG)
Stide pocket motor
Controls ON/OFF of the slide pocket motor rotation in the OPEN direction.
forward rotation control
Active ''H'',
14
SLIDE M.O)
Slide pocket motor
Controls ON/OFF of the slide pocket motor rotation in the CLOSE direction.
_
reverse rotation controi
Active ''H'',
15
RESET
Reset input
Microprocessor resetting input. Active "'H'',
16
CL1
External ciock input
_
Connection terminal for the X'tal system clock oscillator.
17
VDD
=
Power supply
eae
] Power supply input.
_
18
CL2
~|
Externai clock
Connection terminal for the X'tal system clock oscillator.
19
-
-
Not connected.
20
M-S
REQ
| Master>Slave communi-_
Communication
request input from the Master microprocessor.
cation request input
Active "H",
21
SCK
Serial clock
Serial clock input from the Master microprocessor.
22
so
Serial data output
Serial data output terminal,
23
NC
NC
Not connected
24
Sl
Serial data input
Serial data input terminal.
25
SCK REQ
Serial clock request
Serial clock request output to the Master microprocessor. Active "'H".
26
S?-M REQ
Slave>Master communi-
Communication
request output to the Master microprocessor.
cation request output
Active "HH".
27 ,28
NC
NC
Not connected,
29
FWD
Assist motor FWD output
Controls the FWD-direction rotation of the assist motor used for the
forward/reverse movement of the mechanism head. Active ''H"'.
30
REV
Assist motor REV output
Controls the REV-direction rotation of the assist motor used for the
forward/reverse movement of the mechanism head. Active ''H"'.
31
|
FF
Assist motor FF output
"
Controls the FF-direction rotation of the assist motor of the
FF/REW gear of the mechanism. Active H"'.
32
REW
Assist motor REW output
Controls the REW-direction rotation of the assist motor of the
FF/REW gear of the mechanism. Active "H".
33
T.ADV
T.ADV solenoid
Controls the T.ADV solenoid of the mechanism.
SOLENOID
control output
Active ''H"',
34
FWD/REV
Equalizer amp switching
Controls the FWD/REV switching of the equalizer amp.
control output
"H" for REV, "L" for FWD.
35
DOOR
Door open solenoid drive
Drives the door shutter opening/closing solenoid.
SOLENOID 0
36
DOOR
Door open solenoid drive
Holds the door shutter opening/closing solenoid.
SOLENOID
1
37
GND
Ground
Grounding terminal.
38,39
—_
~
Not connected.
40~43
TO~T3
Key scanning
Output terminals of 4X4 key matrix scanning signal. Active ''L"'
44
NC
NC
Not connected
21
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