E L E C T R I C A L T R O U B L E S H O O T I N G
I
VCR POWER TROUBLESHOOTING
FLOWCHART NO. l-l
CASSETTE CONTROL TROUBLESHOOTING
FLOWCHART NO.
The VCR is dead. (No power)
A cassette tape is not taken in.
plug the AC power cord.
Is the fuse
in the power
7
SW
?
Replace the fuse.
Are the AT
and
lines
Check fuse resistor and transistor
normal in the MAIN
?
YES
Is the AT
line normal ?
YES
NO
Check the AT
line,
and
Are the AT
and
lines
N O
properly connected with
?
Check poor soldering.
YES
Is there oscillation at pins
and
of
?
Check Replace
and or
YES
Does pin
of
change from
to
level after the AC cord is
plugged in or/when the RESET
Check the signal line of
reset
button is pressed and then released ?
all the way up to pin
of
J
YES
Does pin
of
change from
to
level when the power
button is pressed to turn the power
on ?
Check power key input to
and serial
between
and
Check
and
Check wire harness to mechanism
and the sensor inputs to
from
YES
Fix or replace the cassette housing.
I
I
I
Does the start sensor cover become
open when the cassette tape is
inserted ?
Check the start sensor cover.
YES
Does the start sensor pin
of
go to
level when the
cassette tape is inserted ?
N O
Check the start sensor and the way
up to pin
of
YES
Does pin
of
go to
level
(about
when the
tape
Check pin
of
and all the
is inserted ?
way up to pin
of
I
I
I
YES
Does pin
of
go to about
IV when the cassette tape is
inserted ?
N O
Check
and
line.
Is the correct voltage at the loading
Check and replace the loading motor
A cassette tape is taken in, but ejected at once.
FLOWCHART NO.
I
Does
sensor pulse at pin
of
change from
to
level
when the cassette tape is loaded ?
Check the start sensor and all the
YES
,
Does end sensor pulse at pin
of
change from
to
level
ND
Check the end sensor and all the
when the cassette tape is loaded ?
YES
Do the cam switches A and B
operate normally when the cassette
tape is loaded ? (at pins
and
to MECHANISM flowchart)
Check cam switches and all the way
Содержание VT-3448X
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