Sharp RP-307H Serviceanleitung Seite 8
Rp_307H
-FUNCTIONSOF CONTROL MICROCOMPUTER(LM6416E)
Pin No.
Name
MUTING
2
•45/33
P. MOTOR
CW
3
4
P. MOTOR
CCW
5
CR OSC
6
7
INT
8
RESET
9
SOLENOIDE
10
ARM
FWD
11
ARM
REV
12
ARM
LOW/HIGH
13
TEST
vss
14
15
SIDE
A
16
SIDE
B
17
BOTH
SIDE
18
REPEAT
19
EP/LP
20
VDD
21
ARM
REST
22
23
KEY
IN
24
25
26
KEY
SCAN
27
ADDRESS
28
Input/
level
Ou tput
Thissignal isat High level i nanymode other t hanplay mode to activate t hemuting circuit; i t is
High
kept at Low level in play mode.
Output,
High
Thissignal. becomes H ighlevel w henthespeed selector k eyissetat 45rpm position andit
becomes L owlevel w henat 33rpmposition. I t isat Lowlevel w henthemicrocomputer ICl
is reset.
Output
High
Not
used.
Output
High
Not used.
Thetimeconstant o f these
Not u*d.
Input
When t hissignal isat Lowlevel. themicrocomputer
Low
keeps o nitsstandby s tate for 0.5second during which all thefunctions o f theset a restopped.
0.5second thereafter. t hemicrocomputer judges w hether o r not thetonearm ispresent at its
rest position;if'not,
the set gets-ready to wait further key operation.
Output
High
This signal becomes Low level when thetonearm i sin upposition, and it becomes
when in down position.
Output
LOW
Thissignal,whenat Low level,causes t hetonearmmotorto rotateclockwise.
Output
Low
Thissignal,whenat Law level,causes t hetonearmmotorto rotatecounterclockwise.
When pins 10 and 11 of ICI areat Highlevel, t hetonearm motoriskeptin stop.
When t hese pins become L owievei, ' C2turns onto allowthetonearm to begin moving
on the
disc.
Andwhen thetonearm ismoving, if thetonearm forward or reverse keyispushed, thetonearm
motor turns on and the following pulse is generated for about 0.8 second.
Output
Low
Not
used.
Not used (to connect
GND
Output
Low
Not used.
Output
Low
Not used.
Output
Low
Not
used.
Output
This signal, when ai Lowlevel, causes the repeat indicator (LED 3)to lightup.
Low
Output
LOW
Thissignal b ecomes L owlevel w ith LPrecord playing andcauses the LPIndicator ( LED2) to
light up.
This is +5V supply pin.
Input
Thissignal b ecomes L OW levelwhenthetonearm isat therestposition.
Low
Therestposition is detected whenthepulseis going to riseup.
Input
Input
Matrix f ort-nation
Input
lock-out type and its chattering is limited to 40 msec.
Output
Output
Output
Input
Thissignal iscornbined withthesigna' (ARMREST) available at pin
signal t ellsthemicrocomputer where thetonearm isnowpositioning (atthelead-in andlead-
outpositions andat thesignal r ecord zone). W here thetomearm isnowpositioning i s
detected when the pulseis going to riseup or go down.
Function
to produce clocksignals o f about 4 00kHz.
the microcomputer causes thé tonearm to return to the rest
to Vss).
ofthese pins provides
7circuits forkey input o peration.
—8—
isreset; once reset, themicrocomputer
High level
The key input i sof
,andtheresultant
