Previous Preparation; Deck Adjustment; Torque Measuring; Adjustment - LG LH-CX640 Series Service Manual

Purpose
o f
Measuring
:
To
measure
and
check
the
reel
torque
on
the
take-up
part
and
the
supply
part
that
performs
basic
operation of
the
VCR
(VCP)
for
smoothly
forwarding
the
tape.
Measure
and
check
followings
w hen
the
tape
is
not
smoothly
wound
or
the
tapevelocity
is
abnormally
proceeded:
4-14
\342\200\242
Torque
Gauge
(600
g.cm
ATG)
\342\200\242
Torque
Gauge
Adaptor
\342\200\242
Cassette
Torque
Meter
SRK-VHT-303
\342\200\242
Play
(FF)
or
Review
(REW)
Mode
\342\200\242
Try
to
operate
the
VCR
(VCP)
per mode
with
the
tape
not
inserted
(See
'2.
Prior
Preparation
for
Deck
Adjustment).
\342\200\242
Measure
after
adhering
and
fixing
the
torque
gauge
adaptor
to
the
torque
gauge
(Fig.
C -3-1)
\342\200\242
Read
scale of
the
supply
or
take-up
part
of
the
cassette
torque
meter
(Fig.
C-3-2).
DECK
MECHANISM
ADJUSTMENT
1)
Take
the
power
cord
from the
consent.
2)
Separate
the
top
cover
and
the plate
assembly
top.
3)
Insert
the
power
cord into
again.
4)
Turn
the
VCR
(VCP)
on
and
load
the
cassette while
push-
ing
the
lever
stopper
of the holder
assembly
CST back-
ward.
In
this
case, clog
both
holes
on
the
housing
rail
part
of
chassis
to prevent
detection of the
end
sensor.
If
doing
so, proceeding
to the
stop
mode is
done.
In
this
status, input
signals of
all
modes
can
be
received.
However, operation of
the
Rewind
and
the
Review is
impossible
since
the
take-up
reel
remains at
stop status
and
so
cannot
detect
the
reel
pulse
(however,
possible
for
several
seconds).
2.
Previous
Preparation
for
Deck
Adjustment
(Preparation
to
load
the
VCR
(VCP)
with
cassette
tape
not
inserted)
3.
Torque
Measuring
NOTE
Adhere
the
torque
gauge adaptor to the torque
gauge
for
measuring
the
value.
SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-303
SRK-VHT-
S
SRK-VHT-T
300
250200
150
50
0
300
250
200
150
50
0
100
Fig.
C-3-2
Fig.
C-3-1
Torque
Gauge
Torque
Gauge
Adaptor
Reel
Table
Item
Fast forward
Torque
Rewind
Torque
Play
Take-Up
Torque
Review
Torque
Fast
Forward
Rewind
Play
Review
Torque Gauge
Torque
Gauge
VHT-303
VHT-303
Take-Up
Reel
Supply
Reel
Take-Up Reel
Supply Reel
More
than
400g\302\260cm
More
than
400g\302\260cm
40~100g\302\260cm
120~210g\302\260cm
Mode
Instruments
Reel
Measured
Measuring
Value
\342\200\242
Cassette
Torque
Meter
(SRK-VHT-303)
\342\200\242
Torque
Gauge
(600g.cm
ATG)
VCR
(VCP)
status
Measuring method
Fixtures
a nd
tools
used