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Panasonic C1381 User manual

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ORDER
NO.
KME9010170C3
ervice
Manual
Color
Computer
Display
C1381
Chassis
No.
KMX-F407E
CONTENTS
Page
SAFETY
PRECAUTIONS.
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2
CONTROL
LOCATIONS
AND
OPERATIONS...
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ene
4
SPECIFICATIONS
..
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5
DISASSEMBLY
INSTRUCTIONS
...
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10
GENERAL
CONNECTION
&
APPLICATIONS.
.......
000
00
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13
ELECTRONIC
CIRCUIT
DESCRIPTION
..
0.20...
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14
ADJUSTMEN
Tivosees
8
acai
dete
OS
oes
een
ae
a
hob
RS
OR
15
COMPONENT
REFERENCE
GUIDE...
1...
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ee
20
TROUBLESHOOTING
FLOW
CHART...
0.2...
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es
22
BLOCK
DIAGRAM
§
fii
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eas
Bares
ee
a
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i
He
Ee
ee
29
CIRGUIT:
BOARD
®:
occcce
Sig
ah
ok
A
gt
OES
le
A
a
diay
cgi
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gee
30
SCHEMATIC
DIAGRAM
..
0...
eee
ee
31
MECHANICAL
PARTS
LOCATION.
......0..
000
cc
eee
eee
ete
ee
32
REPLACEMENT
PARTS
LIST
.......2
200
eee
eee
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ee
ee
tee
33
Matsushita
Electric
Industrial
Co.,
Ltd.
Central
P.O.
Box
288,
Osaka
530-91,
Japan
Panasonic.
Specifications
are
subject
to
change
without
notice.
IMPORTANT
SAFETY
NOTICE
There
are
special
components
used
in
Panasonic
Computer
Display
which
are
important
for
safety.
These
parts
are
shaded
on
the
schematic
diagram
and
on
the
replacement
parts
list.
It is
essential
that
these
critical
parts
Be
be
replaced
with
manufacturer's
specified
parts
only
to
prevent
X-RADIATION,
shock,
fire,
or
other
hazards.
Do
not
modify
the
original
design.
ABBREVIATIONS
USED
IN
THIS
MANUAL
ITC
Integral
Tube
Component
AVR
Automatic
Voltage
Regulator
FET
Field
Effect
Transistor
CRT
Cathode
Ray
Tube
DY
Deflection
Yoke
FBT
Flyback
Transformer
CY
Convergence
Yoke
AFC
Automatic
Frequency
Control
MOS
Metal
Oxide
Semiconductor
VR
Variable
Resistor
SAFETY
PRECAUTIONS
GENERAL
GUIDELINES
1.
Use
an
isolation
transformer
in
the
power
line
and
AC
supply
to
troubleshoot.
_
When
servicing,
observe
the
original
lead
dress,
especially
the
lead
dress
in
the
high
voltage
circuits.
If
a
short
circuit
is
found,
replace
ail
parts
which
have
been
overheated
or
damaged
by
the
short
circuit.
-
_
After
servicing,
ensure
that
all
the
protective
devices
such
as
insulation
barriers,
insulation
papers,
shields,
and
isolation
R-C
combinations,
are
properly
installed.
Before
turning
the
display
on,
measure
the
resistance
between
B+
line
and
chassis
ground.
Connect
©
side
of
an
ohmmeter
to
the
B+
lines,
and
©
side
to
chassis
ground,
Each
line
should
have
more
resistance
than
the
following
specifications:
B+
Line
Minimum
Resistance
5V
370k
Q
12V
164
15V
330k
22
20V
680
Q
25V
14k
2
100V
Ak
Q
5.
Potentials,
as
high
as
24.5kV
are
present
when
this
display
is
in
operation.
Operation
of
the
display
without
the
rear
cover
involves
the
danger
of
a
shock
hazard
from
the
display
power
supply.
Servicing
should
not
be
attempted
by
anyone
who
is
not
thoroughly
familiar
with
the
precautions
necessary
when
working
on
high
voltage
equipment.
Always
discharge
the
anode
of
the
picture
tube
to
the
display
chassis
before
handling
the
tube.
_
After
servicing,
perform
the
leakage
current
checks
to
prevent
the
customer
from
being
exposed
to
shock
hazards.
f
a
LEAKAGE
CURRENT
COLD
CHECK
1,
Unplug
the
AC
cord
and
connect
a
jumper
between
the
two
prongs
on
the
plug,
.
Turn
on
the
display
power
switch.
.
Measure
the
resistance
value,
with
an
ohmmeter,
handling
26.0kV
without
causing
X-
Radiation.
NOTE:
It is
important
to
use
an
accurate,
periodically
calibrated
high
voltage
meter.
1.
Slide
the
Brightness
contro!
to
minimum.
between
the
jumpered
AC
plug
and
each
exposed
2.
Measure
the
high
voltage.
The
meter
reading
should
metallic
cabinet
part
on
the
display,
such
as
screwheads,
indicate
24.5
kV
+
O.5
kV.
If
the
meter
indication
terminals,
control
shafts,
handle
bracket,
etc.
When
an
is
out
of
tolerance,
immediate
service
and
correction
exposed
metallic
part
has
a
return
path
to
the
chassis,
is
required
to
prevent
the
possibility
of
premature
the
reading
should
be
between
240
kQ
and
5.2
MQ.
component
failure.
When
exposed
metal
does
not
have
a
return
path
to
the
3.
To
prevent
an
X-Radiation
possibility,
it
is
essential
to
chassis,
the
reading
must
be
oo,
LEAKAGE
CURRENT
HOT
CHECK
(See
figure
1.)
1.
Plug
the
AC
cord
into
the
AC
outlet.
DO
NOT
use
an
isolation
transformer
for
this
check.
.
Connect
a
1.5
kQQ,
10
watts
resistor,
in
parallel
with
a
0.15
wF
capacitor,
between
each
exposed
metallic
part
use
the
specified
picture
tube.
HORIZONTAL
OSC.
DISABLE
CIRCUIT
TEST
WARNING:
This
test
must
be
made
as
a
final
check
before
the
set
is
returned
to
the
customer.
.
With
rear
cover
removed,
supply
nominal
220V
AC
and
connect
a
host
computer
to
the
set.
on
the
set
and
a
good
earth
ground
such
as
a
water
pipe,
2.
Turn
on
the
power
switch
and
adjust
the
monitor
as
shown
in
figure
1.
controls
to
the
normal
position.
3.
Supply
a
full
screen
of
‘‘H”
characters
from
the
host
Leakage
Current
Hot-
Check
Circuit
computer.
AC
VOLTMETER
4.
Turn
R826
(B+
Adj.)
fully
counterclockwise.
5.
Connect
a
short
jumper
between
TP503
and
ground.
6.
Turn
R826
(B+
Adj.)
slowly
clockwise.
0.15uF
7.
Confirm
that
the
picture
fails
out
of
horizontal
sync.
[ese
8.
If
the
test
fails,
the
Horizontal
Osc.
Disable
Circuit
Neen
menae
Seopa
ay
eect
GaBUne
is
not
operating
and
must
be
repaired.
era
Mapas
"
:
Refer
to
the
Horizontal
Oscillator
Disable
Circuit
Figure
1
Repair
Procedure.
9.
After
confirmation
of
this
Test,
remove
the
short
jumper
3.
Use
an
AC
voitmeter,
with
1000
ohms/volt
or
more
sensitivity,
to
measure
the
potential
across
the
resistor.
.
Check
each
exposed
metallic
part,
and
measure
the
voltage
at
each
point.
.
Reverse
the
polarity
of
the
AC
plug
in
the
AC
outlet
and
repeat
the
above
measurements.
.
The
potential
at
any
point
should
not
exceed
0.75
volt
RMS.
A
leakage
current
tester
(Simpson
Model
229
or
equivalent)
may
be
used
to
make
the
hot
checks.
Leakage
current
must
not
exceed
0.5
milliamp.
If
a
measurement
is
Outside
of
the
specified
limit,
there
is
and
readjust
B+
voltage
to
100V.
This
circuit
must
be
operative
before
the
set
is
returned
to
the
customer.
HORIZONTAL
OSC.
DISABLE
CIRCUIT
REPAIR
PROCEDURE
1.
Connect
a
DC
voltmeter
between
the
cathode
of
D553
and
chassis
ground
of
the
main
board.
If
approximately
13.6V
is
not
present
on
the
anode,
find
the
cause.
Check
D553
and
R534.
;
2.
Connect
a
DC
voltmeter
between
the
cathode
of
D555
a
possibility
of
a
shock
hazard,
and
the
monitor
should
;
;
:
;
and
chassis
ground
of
the
main
board.
If
approximately
be
repaired
and
rechecked
before
it
is
returned
to
the
\
;
13V
is
not
present
on
the
cathode,
find
the
cause.
t
;
pas
Check
R566,
R567,
C560,
D553
and
R534.
X-RADIATION
3.
Repeat
step
2
procedure.
If
approximately
13V
is
f
WARNING:
1.
The
potential
source
of
X-Radiation
in
the
present
on
the*cathode,
check
D555,
and
IC5002.
=
display
is
the
high
voltage
section
and
the
4.
When
the
circuit
is
repaired,
perform
the
horizontal
picture
tube.
2.
When
using
a
picture
tube
test
jig
for
service,
ensure
the
jig
is
capable
of
oscillator
disable
circit
test
again.
CONTROL
LOCATIONS
AND
OPERATIONS
CONTROL
LOCATIONS
(Front
View)
;
=<
|
==]
it
~
|
=i——O
POWER
Switch
PUSH
POWER
Indicator
Front
User
Controls
-
@®
a
Contro!
©)
V-SIZE
Control
®
H-CENTERING
Control
(Rear
View)
AC
Inlet
OPERATIONS
@)
CONTRAST
Control
@
BRIGHTNESS
Control
@
H-SIZE
Control
Figure
2
Rear
User
Controls
Signal
Cable
Figure
3
@)
POWER
Switch
Push
to
turn
the
display
on,
and
push
again
to
turn
the
display
off.
When
the
display
is
on,
the
power
indicator
lights.
@
CONTRAST
Control
.
Adjust
the
display
for
proper
contrast
level.
(White
level)
®
BRIGHTNESS
Control
Adjust
the
display
for
proper
brightness
level.
{Black
level)
@
H-SIZE
Control
Adjust
the
display
for
proper
horizontal
size.
This
control
has
a
click
position
which
gives
the
proper
horizontal
size
for
[BM
personal
computer
standard
video
boards.
6)
H-CENTERING
Control
Adjust
the
display
for
proper
horizontal
position.
This
contro!
has
a
click
position
which
gives
the
proper
horizontal
position
for
1BM
personal
computer
standard
video
boards.
©)
v-SIZE
Control
Adjust
the
display
for
proper
vertical
size.
This
control
has
a
click
position
which
gives
the
proper
vertical
size
for
IBM
personal
computer
standard
video
boards.
@_
V-CENTERING
Control
Adjust
the
display
for
proper
vertical
position.
This
contro!
has
a
click
position
which
gives
the
proper
vertical
position
for
[BM
personal
computer
standard
video
boards.
—
4
—
i,
SPECIFICATION
1.
SCOPE
;
The
purpose
of
this
specification
is
to
describe
the
cabinet
type
color
display,
which
is
a
Multi
Scan
Rate
type.
2.
MECHANICAL
DESCRIPTION
2-1.
Dimensions
Width:
13.9
in,
(354
mm)
Depth:
14.8
in.
(375
mm)
Height:
14.4
in.
(366.5
mm)
2-2.
Weight
Monitor
only:
25.3
Ibs
(11.5
kg)
Monitor
packaged
for
shipment:
28.2
Ibs
(12.8
kg)
3.
CONSTRUCTION
3-1.
Outline
AC
See
ee
220
~
240V
VIDEO
~----
CONTR
CONTRAST
Boece
ec
BRIGHTNESS
H.
SIZE
H.
CENTER
Vv.
SIZE
V.
CENTER
REAR
FRONT
Figure
4
3-2.
CRT
Characteristics
Size:
14
inch
diagonal
(13
inch
visual)
Matrix:
Black
opaque
matrix
Matrix
type:
Negative
guard
band
Faceplate
type:
Non-glare
surface,
Tinted
screen
glass
CRT
part
No.
PAWD1C1381H*
Phosphor:
P22
Persistance:
Short
Array:
Triangular
dot
trios
Trio
pitch:
0.28
mm
typ.
at
center
*
This
No.
(PAWD1C1381H)
is
1TC
NO..
CRT
is
supplied
as
ITC.
ITC
=
Integral
Tube
Component
(CRT
with
DY
and
CY)
POWER
SWITCH
4.
ENVIRONMENTAL
CHARACTERISTICS
4-1.
Temperature,
Humidity
and
Altitude
4-1-1.
Operating
Conditions
Temperature:
+32°F
~
+104°F
(0°C
~
+40°C)
Humidity:
5
~
90%
(no
condensation)
Altitude:
10,000
Feet
max.
(3.048m
max.)
4-1-2.
Non-Operating
Conditions
Temperature:
—40°F
~
—149°F
(-40°C
~
+65°C)
Humidity:
5
~
90%
(no
condensation)
Altitude:
40,000
Feet
max.
(12.192m
max.)
4-1-3.
Storage
and
Shipment
Temperature:
—40°F
~
+149°F
(—40°C
~
+65°C)
Humidity:
5
~
95%
(no
condensation)
Altitude:
40,000
Feet
max.
(12.192m
max.)
4-2.
Vibration
and
Shock
(Packaged
Condition)
4-2-1.
Vibration
Frequency:
5
~
50
Hz
(Sweep
cycle
810
seconds)
Length
of
time
for
testing:
Vertical
oo...
40
min.
Horizontal
oo...
40
min.
ae
and
Rear
.......
20
min:
Right
and
Left
........
20
Fe
Acceleration
of
vibration:
Vertical
oe,
1.00G
Horizontal
...........
0.5G
4-2-2.
Shock
Corner
and
edge:
Height:
19.69
!n.(60
cm)
Front,
back
side
and
bottom:
Height;
23.62
in.(60
cm)
Shock
is
given
to
corner,
edge,
front,
back
side
and
bottom
10
times
each.
5.
ELECTRIC
PERFORMANCE
5-1.
Power
Supply
Input
voltage:
180
~
264V
AC
Input
frequency:
50
Hz
Input
current:
0.7A
max,
(at
230V
AC)
Power:
9Q5W
max.
(at
230V
AC)
Surge
current:
80A
max.
(at
230V
AC}
5-2.
Input
Signals
5-2-1,
5-2-2.
5-2-3.
Note:
Video
Signal
Polarity:
Positive
Signal
level:
Analog
0.7Vp-p/75
ohm
Horizontal
Synchronization
Signal
Polarity:
Positive/Negative
Signal
level:
TTL
level
separate
sync
Frequency
:
30
kHz
to
37
kHz
continuous.
Auto
size
and
center
at
31.5
kHz,
35.2
kHz
VGA/SVGA/8514A
standards.
Vertical
Synchronization
Signal
Polarity:
Positive/Negative
Signal
level:
TTL
level
separate
sync
Frequency:
50
Hz
to
90
Hz
continuous.
Non
Interlaced
or
Interlaced
modes.
Auto
size
and
center
for
VGA/
SVGA/8514A
standards.
The
monitor
detects
vertical
&
horizontal
sync
polarity
and?
automatically
select
its
polarity
and
frequency.
5-3.
Signal
Timing
See
figures
on
page
8.
5-4.
Video
Output
Amplifier
response
The
video
amplifier
produces
a
drive
signal
at
the
cathodes
of
the
CRT
of
sufficient
amplitude
to
produce
a
spot
luminance
with
rise
and
fall
times
of
less
than
12
nsec.
from
10%
to
90%
pulsed
level,
Cathode
voltage
is
30Vp-p./Signal
source
is
75
ohm
impedance
and
oscilloscope
impedance
is
5pF,1M
ohm.
6.
OPTICAL
CHARACTERISTICS
6-1.
Image
Test
Condition
Character:
All
'H”
character
Color:
White
Brightness
control:
©
Max.(without
background)
Contrast
control:
Max.
View
direction:
Parallel
to
the
CRT
axis
Ambient
Supply
voltage:
Room
temperature
220V
AC,
50
Hz
temperature:
Terrestrial
Horizontal
field...0.0
Gauss
Vertical
field.......
0.2
Gauss
magnetism:
Note:
All
measurements
shall
be
made
under
normal
conditions
after
an
initial
warm-up
time
of
20
minutes,
Note:
A
normal
condition
is
when
the
monitor
pro-
duces
the
desired
test
image.
The
conditions
of
the
items
are
normal
unless
(
otherwise
stated.
6-2.
Image
6-2-1.
Image
size
Horizontal:
9.65
+
0.39
in.
(245+
10
mm)
Vertical:
7.20
£
0.28
in,
(183
+ 7
mm)
6-2-2,
Image
position
6-2-3.
Cc
Mask
opening
B
Edge
line
of
the
image
D
1A
—
BI
S
0.236
in.
(6
mm)
IC
—
DI
S
0.236
in.
(6
mm)
Figure
5
Image
Position
Distortion
(A)
Pincushion
a,b
<_
0.098
in.
(2.5
mm)
*
c,d
<
0.098
in.
(2.5
mm)
Input
signal
is
a
crosshatch
pattern.
Figure
6
Pincushion
Error
Fy
(B)
Rectangularness
&
Parallelogram
Distortion
Bendy
0.118
in.
(3
mm)
Dosis
0.118
in.
(3
mm)
Input
signal
is
a
crosshatch
pattern.
Figure
7
Parallelogram
Distortion
(C)
Linearity
Figure
8
Linearity
X
(MAX.)
—
X
(MIN,)
HORIZONTAL
LINEARITY
=
—-—-—-——--__
x
100
(%)
S$
7.5%
X
(MAX,)
+
X
(MIN,)
Y
(MAX,)
—
Y
(MIN,)
VERTICAL
LINEARITY
=
—————_—__
x
100
(%)
S$
7.5%
Y
(MAX,)
+
Y
(MIN.)
Maximum
and
minimum
value
should
not
be
adjacent
to
each
other.
X
(MAX.)
=
Maximum
distance
between
vertical
lines
from
X1
to
Xm.
X
(MIN.)
=
Minimum
distance
between
vertical
lines
from
X1
to
Xm,
Y
(MAX,)
=
Maximum
distance
between
horizontal
lines
from
Y1
to
Yn.
Y
(MIN.)
=
Minimum
distance
between
horizontal
lines
from
Y1
to
Yn.
(D)
Rotation
Horizontal
tine
of
the
image
shall
be
within
the
shaded
area.
Edge
of
"image
Horizontat
center
of
CRT
a
=
0.079
in.
(2
mm)
Input
signal
is
a
crosshatch
pattern.
Figure
9
Rotation
(E)
Convergence
9.65
in.
(245
mm)
7.2
in.
(183
mm)
area
A
S
0.0118
in.
(0.3
mm)
areaB
S
0.0236
in.
(0.6
mm)
Figure
10
Mis-Convergence
Note:
Should
be
measured
under
the
following
conditions.
1)
Terrestrial
magnetism
without
horizontal
field
(O
Gauss).
With
vertical
field
of
0.2
Gauss.
2)
At
room
temperature
3)
Input
signal:
Crosshatch
R,
G,
B
mixed
colors.
6-3.
Image
Size
Variation
Notes
and
test
conditions
Image
size
variation
from
the
normal
image
size.
Within
+
0.118
in.(+
3m)
(Horizontal
and
Vertical)
Rotation
of
brightness
control
AC
line
voltage
varied
220
to
240
volts
Within
+
0.157
int
4
mm)
(Horizontal
and
Vertical)
External
ambient
temperature
3
varied
20
+
20
C
Within
+
0.157
in.(+
4mm)
{Horizontal
and
Vertical)
Testing
condition
is
normal
condition.
7,
OVERALL
PERFORMANCE
7-1,
Resolution
Horizontal
.....
...
1024
Pixels
Vertical
0.
768
Pixels
7-2.
insulation
More
than
100
MQ
Between
AC
line
and
chassis.
7-3.
Jitter
Less
than
1
dot
Invisible
at
a
distance
of
18
in.
(45.7
cm)
from
CRT
surface
8.
CONNECTOR
8-1.
Signal
Connector
15
pin
mini
D-SUB
type
connector
(interface
cable)
et
*
oc:
i,
C1381
*%
TIMING
CHART
Horizontal
Sync
Timing
Line
Time
——+|
Total
Sync
Pulse
Active
—>|
Blanking
Figure
11
Standard
Signal
Timing
(Preset
Timing)
There
shail
be
preset
timing
for
8514/A,
SVGA
and
VGA,
Vertical
Syne
Timing
Line
Time
poner’
Total
Sync
Pulse
Front
Active
Blanking
:
Non-Interlaced
or
Interlaced.
NOTE:
Scanning
mode
Figure
12
8514/A
|
SVGA
Pixel
period
22.0
ns
27.8
ns
Pixel
Rate
44.90
MHz
(Interlaced)
36.0
MHz
Horizontal
Frequency
35.52
kHz
35.16
kHz
Line
Time
Total
28.15
us
28.44
pus
Active
22.80
us
22.22
us
Blanking
5.35
ys
6.23
ps
Front
Porch
0.18
ps
0.67
us
Sync
Pulse
3.92
us
2.00
us
Back
Porch
1.25
us
3.56
us
Vertical
Frequency
86.96
Hz
(Field
Frequency)
56.24
Hz
Frame
Time
Total
23.0
ms
17.78
ms
Active
10.81
ms
17.07
ms
Blanking
0.69
ms
0.72
ms
Front
Porch
0.014
ms
0.03
ms
Sync
Pulse
0.1126
ms
0.06
ms
Back
Porch
0.564
ms
0.63
ms
[
Active
Dots
(H
x
V)
1024
x
768
800
x
600
|
ty
i,
IBM
PS/2
(VGA)
Mode
1
Mode
2
Mode
3
Pixel
Period
35.30
ns
35.30
ns
39.70
ns
Pixel
Rate
28.32
MHz
28.32
MHz
25.176
MHz
Horizontal
Frequency
31.47
kHz
31.47
kHz
31.47
kHz
Line
Time
Total
31.78
us
31.78
ps
31.78
ps
Active
25.42
us
25.42
us
25.42
us
Blanking
6.36
ps
6.36
ps
6.36
Us
Front
Porch
0.64
ps
0.64
pus
0.64
us
Sync
Pulse
3.81
us
3.81
ps
3.81
Us
Back
Porch
1.91
us
1.91
ps
1.91
us
Vertical
Frequency
70.08
Hz
70.08
Hz
59.95
Hz
Frame
Time
Total
14.27.
ms
14.27,
ms
16.68
ms
Active
11.12
ms
12.71
ms
15.25
ms
Blanking
3.147
ms
1.557
ms
1.431
ms
Front
Porch
1.176
ms
0.381
ms
0.318
ms
Sync
Pulse
0.064
ms
0.064
ms
0.064
ms
Back
Porch
1.907
ms
1.112
ms
1.049
ms
Active
Dots
640
x
350
640
x
400
640
x
480
Signal
Timing
for
Apple
MAC
IL
Apple
MAC
IL*
*
When
the
Apple
MACIL
is
used,
adjust
H-Size
and
V-Size
to
proper
size
(approximately
236mm
x
176mm)
Pixel
Period
33.1
ns
by
H-SIZE
control
(R514)
and
V-SIZE
control
(R445).
Pixel
Rate
30.21
MHz
Horizontal
Frequency
35.00
kHz
;
;
Line
Time
Total
28.571
us
NOTE
1:
C1381
is
not
auto
sized
and
centered
when
Active
21.164
ps
used
with
Apple
MACIL.
Blanking
7.407
us
Front
Porch
2.116
us
NOTE
2:
When
Apple
MACII
is
used,
an
optional
Sync
Pulse
2.116
bs
15P-15P
mini
adaptor
(C81M2)
is
needed.
Back
Porch
3.175
us
Vertical
Frequency
66.67
Hz
Frame
Time
Total
15.000
ms
Active
13.714
ms
Blanking
1.286
ms
Front
Porch
0.086
ms
Sync
Pulse
0.086
ms
Back
Porch
1.114
ms
Active
Dots
640
x
480
*
H/V
composite
sync
DISASSEMBLY
INSTRUCTIONS
1.
Pedestal
Removal
—
a)
Turn
the
unit
rear
side
down
with
pedestal
towards
the
front.
(
Figure
13)
b)
Remove
2
screws
(A)
from
the
swivel.
(Figure
13)
c)
Slide
the
swivel
down.
(Figure
14)
d)
Turn
the
swivel
135°
counter-clockwise.
(Figure
14)
e)
Slide
the
swivel
up.
(Figure
15)
f}
Turn
the
swivel
45°
counter-clockwise.
(Figure
15)
g)
Slide
the
swivel
down
and
remove
it.
{Figure
16)
h)
Remove
3
screws
from
the
pedestal.
(Figure
17)
Figure
15
Swivel
Figure
13
Figure
14
Figure
17
—10—