Alpine 7516M - Integrated Circuit (IC) Terminal Descriptions; IC501 (35044 W01) Terminal Details

7516M/7516MM
/7516L
Description of IC Terminals
@ 35044W07 : IC501
Symbol
RUN DET
Terminal Description
Signal showing take-up reel is rotating or not,
Period PLAY : 580~1220 (mS)
CUE, REV : 87 (mS)
FF, REW:57 (mS) DUTY SO
PACK DOWN
SW
Switch to detect cassette holder is moved down completely. Pulled-up through
10k~50k ohm resistor connected to BAT +5V,
H: PACK DOWN
L:PACK OUT
LAY SOL
Attracts PLAY SOL and maintains HEAD BASE moved forward.
11: HEAD BASE held (PLAY SOL attracted)
L: HEAD BASE retracted
Sets FF, REW, CUE, or REV mode by pulling RF SOL so that PINCH ROLLER is
retracted from capstan shaft.
H: FF, REW, CUE, or REV status (SF SOL pulled)
L: Mode other than above
{—
EJECT SOL
MOTOR CONT
Performs EJECT operation by pulling EJECT SOL to engage EJECT GEARS and
to rotate motor in clockwise direction.
H: Pulls EJECT SOL,
Determines rotation direction of motor in GR mechanism,
H: Rotation in counterclockwise direction (Forward direction)
L: Rotation in clockwise direction (Reverse direction)
RESET
—
System reset input terminal, Active low.
Xi, X2
Xi, X2
Ceramic element connection terminal for system clock OSC,
Ceramic element connection terminal for system clock OSC,
LEVEL 0 FAST
;
Signal to vary gain when judging blank space between programs in MS-IC
because of different signal levels in PLAY and CUE & REV.
H: CUE, REV status
L: PLAY status
I
MOTOR FAST
Switches motor speed by turning on or off governor circuit inside the motor in
GR mechanism,
H: Governor off (high speed)
L: Governor on (low speed)
0. MOTOR
Determines start and stop of the motor in GR mechanism,
H: Motor rotation
L: Motor stop
Determines running direction of tape depending upon rotation direction of motor.
This signal is used to switch running direction and PRE AMP EQ circuit.
H: FOR direction
L: REV direction
PACK IN SW
Switch to detect cassette is installed into cassette holder or not, Pulled-up through
10k~50k ohm resistor connected to BAT+5V,
Il: PACK IN
L:PACK OUT
GND
GND
MS DET
MS DE’
MS detection signal developed by MSIC,
H: Interval between programs
L:On program
MS detection signal developed by MSIC,
H: Interval between programs
L:On program
LCD IN
Display off input terminal for LCD driver.
H
: Display on
L: Display off
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