4-2.
SYSTEM
CONTROL
The system control circuit using a microcom-
puter
will
carry
out
the following controls.
CD
Operational Control
of
tension arm lock
Q) Indication
of
real time counter
G) Operation control
of
function
SW
@ Control
of
reel motor brake system
G)
Flashing control
of
indication lamps
Since the LED indicator and the electronic
counter indicator are operated by the timing
of
pulse, no tester can find the failure.
The failure can only be found by checking the
waveform on the oscilloscope.
(!) ICl (µPD553C-152) Terminal Description
CLOCK
~'""{
INTERRUPT
RESET
SEGMENT[:
TAPEPULSE
REC
OUT
OSC
DRIVE
QT
RELAY
PB
MUTE
REV OUT
PAUSE
PLANGER
MOTOR
NORMAL
REVOLUTION
REVERSE REVOLUTION
BACK
UP
L-------
EACH
FUNCTION
INPUT
PLAY/FF
OUT
Fig. 6-25
@
IC2
(µPD553C-110) Terminal Description
CLOCK
[
3
DIGIT H2
DIGIT INPUT
4 DIGIT
H3
5 DIGIT
lo
SEGMENT INPUT g
RESET
_,,,,~{
RELAY CTL
0
STOP
OUTPUT
TEST
+IOV
PDr
PD2
PEo
PE1
PE2
PE3
PFo
PF1
PF2
PF3
PH1
CLOCK
DIGIT INPUT 2 DIGIT
Hr
DIGIT INPUT I DIGIT
Ho
REV
UP
AUTO
STOP
QUE
REEL SIZE
REV H
REW
H
REV
UP
LAMP
AUTO
STOP
LAMP
REEL
MOTOR
CTL
Fig. 6-26
-----------------
SERVICE MANUAL GX-747dbx
-----------------
18
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