Sharp VC-90ET

LOADING
MOTOR
AND
EJECT
TROUBLESHOOTING
siwiCaKe
NOs
SYSTEM
CONTROL
TROUBLESHOOTING
eer
Rint
Acassette tape fails to eject.
NO
Are
serial
clock
pulse
and
timer
Does
the
capstan
motor
start
See
FLOW
CHART
NO.8
P
n
i
?
Bes
data
pulse
applied
to
pins
and
when
the
EJECT
button
is
pressed
G)
of
ICBO1
from
ICg00t
?
Yes
Check
1C5001
and
IC801.
Does
the
take-up
reel
disk
turn
Check
the
reel
disk
and
reel
drive
when
the
capstan
motor
is
unit.
Are
system
control
data
pulse
and
running
?
system
control
ready
pulse
applied to pins ® and © , of
YES 1C5001 from IC801 ?
]2 °o
Ipluse atpin (9) of AM NO
socket
when
the
ok
reel
disk
Check
the
reel
sensor.
is turning Does power control (H) pulse at
YES
pin
@
of
1C801
change
from
“L”
Check
!CB01.
: 5 to "H” level ?
NO Check between pin of AM
Is pulse at pin G) of C801 when
the
take-up
reel
disk
is
turning
?
ft
pein
rte
up
to
YES
Does the base of Q6606 change
from “L” to” H*?
YES
\s pin D of CA connector at low
level (about 1.2V) ?
YES
Check the Power unit.
Check Q6606 and all the way up to
IC801.
Is “H“ level at pin © of Icso3_ | NO
when
reel
pulse
has
been
inputted
Check
1€801.
Check Q6606 and R6631.
< m un“
2 °
Is “H” level atpin @ of 1€803? Check C803.
2
°
Is the correct voltage at the Check between IC803 and ail
loading motor terminal ? the way up to the loading motor.
YES
1
m n
Does the loading motor run? Replace the loading motor.
2
°o
Replace the cassette cam, gear,
etc.
<
Se
ie)
io)
aa)
+