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  9. Panasonic PT-302 User manual

Panasonic PT-302 User manual

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ORDER
NO.
VED86100027C3
ervice
Manual
Colour
Video
Projector
PT-302
chassis
No.
Q5
The
service
technician
is
required
to
read
and
follow
the
‘‘Safety
Precautions’
and
’’Important
Safety
Notice”
in
this
service
manual.
Specifications
Power
Source:
AC
220V
~
240V,
50/60
Hz
4318
mm
(170
inch)
Picture
size:
Power
Consumption:
179W
(average)
5102
mm
(200
7/8
inch)
Projection
T
ube:
7
inches
(179
mm)
specially
developed
5080
mm
(200
inch)
Picture
size:
High-Brightness
liquid
cooled
5963
mm
(234
3/4
inch)
CRTs
(R,
G,
B).
6350
mm
(250
inch)
Picture
size:
Lenses:
Double
Focus,
Three
F
1.0
145
7400
mm
(291
11/32
inch)
Lenses
(HYBRID)
7620
mm
(300
inch)
Picture
size:
Resolution:
Video......
650
TV
Lines
(typical)
8835
mm
(345
27/32
inch)
RGB........
1000
TV
Lines
(typical)
Light
Flux:
500
lumens
(typical)
at
white
peak
Video
Input
Level:
140.3Vp-p
75Q
Operating
Ambient
Line
in/out
Level:
1+0,3Vp-p
75Q
or
high
impedance
Temperature:
32°F
~
104°F
(0°C
~
+40°C)
RGB
Input
Level
R:
0.74+0.3Vp-p
752
Operating
Ambient
G:
0.7+0.3Vp-p
75Q
Humidity:
20%
~
80%
(GSYNC:
140.3Vp-p
75Q)
Supplied
Accessories:
AC
Cord
(3
types)
B:
0.7+0.3Vp-p
75
Mounting
kit
(1
set)
H/HV:
0.3
~
6V,
high
impedance
Dimensions:
Height:
290
mm
(11
13/32
inch)
V:
0.3
~
6V,
high
impedance
Width:
576mm
(22
11/16
inch}
Screen
Size:
3810
~
7620
mm
(150
~
300
inch)
Depth:
606
mm
(23
29/32
inch)
Throw
Distance:
3810
mm
(150
inch)
Picture
size:
Weight:
77
\|bs.
(35
kg)
4528
mm
(178
1/4
inch)
;
Specifications
are
subject
to
change
without
notice.
Weight
and
dimensions
shown
are
approximate.
a
rs Fy
5
Panasonic
Matsushita
Elecite
Weds
Co.
PT-302
CONTENTS
FEATURES
oc.
o's Sys ase
8
ad
Reece
che
erarae
Beddacs
ar
ahaa
Ay.
eee
a
eee
RO
oes
ee
A
2
SAFETY
PRECAUTIONS
225.25
iecce
Sie
5
ata
ela
alee
le
esti
ee
tee
as
Wwe
Gee
a
Ste
9
She
3
LOCATION
OF
CONTROLS,
OPERATIONS
AND
CONNECTION
OPTIONAL
EQUIPMENT...........
0.00
cue
ue
c
ences
4~8
DISASSEMBLY
INSTRUCTIONS
...........
00.
ccc
cere
eee
ne
eres
9,10
MAIN
PARTS
LOCATION
CHART
..........
0...
cc
cece
cece
ee
tee
ere
eens
11
CAUTIONS
FOR
SERVICING
.........
0...
ccc
ee
ee
eee
eens
12,13
FIELD
ADJUSTMENTS.
.....
2...
..
eee
e
ee
eee
eee
eee
eee
eee
ane
14
~20
INSTALLATION/ADJUSTMENT
PROCEDURE
..............0
000
ec
ucuae
21
~
32
LOCATION
OF
TEST
POINT
AND
CONTROLS
............
00
veer
e
eee eee
33
~
35
BLOCK
DIAGRAM).
6.5.4.0
6-06
eee
g
ow
be
Ses
COS
Se
EO
Hews
Gee
Rae
36
~
38
INTERCONNECTION...
0...
0...
cc
cee
eee
eee
ee
ee
eee
eee
ee
eee
39,
40
TERMINAL
GUIDE
OF
IC’S,
TRANSISTOR
AND
DIODES.
..............0
0000
ae
41
CIRCUIT:
BOARD
i
oie:
oa
hia
ish
ae.
hb
Gee
ie
ee
SPR
ew
le
Ge
Oe
bala
wee
42
~
54
SCHEMATIC
DIAGRAM
.........
0.0.
ecw
ee
ee
ee
eee
eee
anaes
55
~
74
F/K/P/Q/V/X-BOARD
Sections.
.........
0.00
cece
eee
ee
eee
eee
ee
ees
57,
58
M-BOARD
Section
.......
0.0...
ce
eee
eee
ewe
eee
ee
eee
eens
59,
60
B/S/LR/LG/LB-BOARD
Sections...
..........
00
cc
eee
uceceucuveees
65
~
68
C/J/TR1/TR2-BOARD
Sections...
2.2...
0.0...
cece
ee
eee
ee
69
~
71
A/G/R/T-BOARD
Sections...
0.0...
0...
cece
ee
ee
et
eee
eee
72
~74
EXPLODED:
VIEWS
en.
5:
ees
cece
ese
el
a
a
ote
eae
eae
eee.
AS.
rete
bl
ce
75
~
80
TROUBLESHOOTING.
....
0.0...
cece
ccc
eee
eee
te
eee
81,
82
REPLACEMENT
PARTS
LIST...
0...
..
eee
ee
ee
eee
eee
ees
83
~
110
FEATURES
1
Superb
bright
picture:
High
luminance
output:
5
Improved
raster
quality:
500
lumens
(typical)
at
white
peak
High
voltage
regulation
characteristic:
0.3
MQ
2
Superb
resolution:
1000
Lines
(RGB)
(typical)
6
eee
installation
and
front/rear
projection
easily
selectable.
650
Lines
(Video)
(typical)
RGB
character
reproduction:
e
Ceiling
mount/front
projection
e
Ceiling
mount/rear
projection
equivalent
to
2000
characters
e
Floor
placement/front
projection
(80
x
25)
e
Ceiling
mount
rear
projection
with
mirror
3
Compact
size
and
light
weight
(35
kg,
77
Ibs),
for
easy
¢
Floor
placement
rear
projection
with
mirror
7
Wide-range
computer
compatibility
placement/installation.
aor
. : . :
8
Four
broadcast
system
capabilit
4
Compatibility
with
various
signal
input
sources:
sys
Spe
arty
PAL,
SECAM,
NTSC
and
M-NTSC
4.43
VTR/VCR
Video
Disk
Video
Camera
RGB
Computer
TV
Tuner
SAFETY
PRECAUTIONS
GENERAL
GUIDELINES
1.
It
is
advisable
to
use
an
isolation
transformer
in
the
AC
line
supply
before
servicing
this
model.
2.
When
servicing
observe
the
original
lead
dress,
especially
in
the
high
voltage
circuit.
In
case
of
a
short
circuit,
replace
every
part
which
has
overheated.
3.
After
servicing
observe
that
all
protective
devices
such
as
insulation
barriers,
fish
paper,
shields,
isolation
networks
and
fuses
are
properly
installed.
4.
Before
turning
the
receiver
on,
the
resistance
between
the
B+
line
and
chassis
ground
should
be
checked.
Connect
the
©
side
of
an
ohmmeter
to
the
B+
line
and
the
@
side
to
chassis
ground.
Each
line
should
have
more
resistance
than
specified,
as
follows:
B+
(B—)
Line
Minimum
Resistance
206V
10kQ
116V
3kQ.
27V
30022
17V
2002
12V
10022
10V
3Q
*
-17V
150Q
*
—
Side
to
ground
5.
If
the
set
is
not
intended
to
be
used
for
a
long
time,
the
power
cord
should
be
unplugged
from
the
AC
line
outlet.
6.
Potentials,
as
high
as
32.5
kV
are
present
when
this
set
is
in
operation.
Removal
of
the
covers
involves
the
danger
of
a
shock
hazard
from
the
set’s
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
projection
tube
to
the
set
chassis
before
handling
the
tube.
7.
After
servicing,
make
the
following
leakage
current
checks
to
prevent
a
shock
hazard.
LEAKAGE
CURRENT
COLD
CHECK
1.
Unplug
the
AC
cord
and
connect
a
jumper
between
the
two
plug
prongs.
2.
Turn
on
the
set.
3.
Measure
the
resistance
value
with
an
ohmmeter
between
the
jumpered
AC
plug
and
each
exposed
metallic
part
such
as
screwheads,
input
terminals,
control
shafts,
etc.
When
the
exposed
metallic
part
has
a
return
path
to
the
chassis,
the
reading
should
be
between
490
k{2
and
9
M&2.
When
the
exposed
metal
does
not
have
a
return
path
to
the
chassis,
the
reading
must
be
infinite.
—_
PT-302
LEAKAGE
CURRENT
HOT
CHECK
(See
Fig.
1)
I
Plug
the
AC
cord
directly
into
the
AC
outlet.
Do
not
use
an
isolation
transformer
for
this
check.
.
Connect
a
2
kQ,
10W
resistor,
in
series
with
an
exposed
metallic
part
on
the
receiver
and
an
earth
such
as
a
water
pipe.
.
Use
an
AC
voltmeter,
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
AC
plug
in
the
AC
outlet
and
repeat
each
of
the
above
measurements.
.
The
potential
at
any
point
should
not
exceed
1.4
volts
RMS.
_
In
case
a
measurement
is
outside
of
the
limits
specified,
there
is
a
possibility
of
a
shock
hazard,
and
the
receiver
should
be
repaired
and
rechecked
before
it is
returned
to
the
customer.
HOT-
CHECK
CIRCUIT
AC
VOLTMETER
(High
Impedance)
TO
WATER
PIPE
INSTRUMENT
’S
2kn,
LOW
J
(EARTH)
EXPOSED
METALLIC
PARTS
Fig.
1
X-RADIATION
WARNING:
|
The
potential
source
of
X-Radiation
in
the
color
Projection
System
is
the
High
Voltage
section
and
the
projection
tubes.
NOTE:
it
is
important
to
use
an
accurate,
peliodically,
calibrated
high
voltage
meter.
1.
Turn
the
Brightness
control
fully
counterclockwise.
.
Measure
the
High
Voltage.
The
high
voltage
meter
should
indicate
32
kV
+
0.5
kV.
If
the
upper
meter
indication
is
out
of
tolerance,
immediate
sevice
and
correction
is
required
to
prevent
the
possbility
of
premature
component
failure.
(Refer
to
hich
voltage
adjustment
in
the
manual.)
.
TO
prevent
an
X-Radiation
possibility,
it
ig
esen
tial
to
use
the
specified
projection
tube
only.
.
To
prevent
exposure
to
X-Radiation,
the
groy
ection
tube
shield
must
be
kept
in
place
with
power
ap
lied
to
the
set.
WARNING:
When
using
a
projection
tube
tet
jig
for
service,
ensure
that
jig
is
capable
otha
Nndling
32.5
kV
without
causing
X-Radiati«n.
PT-302
LOCATION
OF
CONTROLS,
OPERATION
AND
CONNECTING
OPTIONAL
EQUIPMENT
LOCATION
OF
CONTROLS
AC
IN
MAIN
POWER
SWITCH
IMPEDANCE
SELECTOR
SWITCH
LINE
IN/OUT
TERMINAL
VIDEO
INPUT
TERMINAL
G/EXT
SYNC
SELECTOR
SWITCH
V
INPUT
TERMINAL
H/HV
INPUT
TERMINAL
B
INPUT
TERMINAL
G/G
SYNC
INPUT
TERMINAL
R
INPUT
TERMINAL
BLUE
SELECTOR
@prower
SWITCH
SWITCH
TV
SYSTEM
SELECTOR
SWITCH
COLO
R
CONTRAST
SHARPNESS
OPERATION
TO
Operate
the
projector
switches
@
and
@
must
be
turned
ON,
and
switch
@
must
be
set
to
the
proper
input
signal
type.
Note:
When
the
separately
supplied
remote
controller
(ET-12R)
is
connected
to
the
video
projector,
switches
@
through
@
and
@
through
@
are
inoperable.
Please
use
the
remote
controiller
for
these
functions.
=
AS
Switch.
PURPOSE
MAIN
POWER
SWITCH
OFF
BL
=
ON
Switches
main
power
supply
ON/OFF.
MAIN
POWER
Power
ON/OFF
switch.
POWER
SWITCH
REMOTE
BH
=
ON
This
switch
is
set
to
the
OFF
position,
when
the
remote
control
is in
use.
RGB
LINE
VIDEO
VIDEO---Push
this
button
to
view
signals
input
via
the
VIDEO
input
terminal.
LINE
---Push
this
button
to
view
signals
input
via
the
LINE
input
terminal.
RGB_---Push
this
button
to
view
signals
input
via
the
RGB
INPUT
SELECTOR
input
terminal.
INPUT
SELECTOR
SWITCHES
This
switch
is
operable
only
when
RGB
signals
are
being
re-
NORMAL
.
a
ceived.
Use
this
switch
when
the
blue
portion
of
the
picture
is
weak.
FINE
BLUE
+
NI)
NORMAL
---Normal
blue.
BLUE
MONO-
FINE
BLUE
-:--A
finer
,
easier-on-the-eye,
blue.
BLUE
MONO:-:--White
picture
on
a
blue
back
ground.
Note:
When
Linear
or
TTL
RGB
signals
are
input
at
inappro-
BLUE
SELECTOR
priate
levels,
the
FINE
BLUE
and
BLUE
MONO
modes
might
not
operate
properly.
BLUE
SELECTOR
SWITCH
SECAM
,
This
switch
is
normally
set
at
AUTO.
PAL.
i
i
ity
i
TV
SYSTEM
igre:
eiedel
if
the
isk
eae
bad
.
the
use
of
dubbed
SELECTOR
SWITCH
Nee:
pes,
etc.,
reception
may
not
be
satis
ac
ory.
AUTO
*
In
that
case,
set
the
switch
to
the
appropriate
input
signal
using
a
screwdriver.
SYSTEM
The
click-stop
indicates
standard,
brightness.
===
(y
EDO
Adjust
to
the
appropriate
brightness
level
for
current
viewing
-
conditions.
Decrease
Increase
EC
ds
Adjust
to
a
desirable
color
intensity.
Decrease
Increase
E=0
==)
Es.
To
obtain
a
sharper
picture
rotate
the
control
clockwse.
For
a
softer
picture
rotate
the
control
counter-clockwse.
soft
sharp
|
EC
DO0-
Adjust
to
a
comfortable
viewing
level,
a
slightly
less
iniense
Low
High
picture
is
easier
on
the
eyes.
Color
Color
0
eB
Adjust
for
proper
skin
tone.
red
gree
If
the
picture
rolls,
as
shown,
adjust
E)
ED
ttre
contro
uP
or
DOWN
until
it
UP
DOWN
stabilises.
Sh
PT-302
CONNECTING
OPTIONAL
EQUIPMENT
Connect
optional
equipment
(example)
according
to
following
illustration.
CASE
1:
Connection
to
a
video
source
—_—TV
Monitor
Video
Projector
HIZ
M0750
VIDEO
IN
aa
eT
Video
Camera
Hifi
VCR
beveneaienenenene
2
es
|
TV
Tuner
PERSONAL
COMPUTER
RGB
INTERFACE
(optional)
ET-11G/12G
=
—
SELECT
THE
APPROPRIATE
SYNC
TYPE
G.
G/SYNC
CASE
3:
Connection
to
the
remote
controller
ET-12R
(optional)
REMOTE
CONTROLLER
(optional)
hee
ET-12R
ERTAMIPILIER
Presentation
System
This
is
the
most
orthodox
VTR
playback
system.
Various
variations
can
be
de-
veloped
on
this
system
according
to
the
required
applications.
Applications:
®@
Conference
Rooms
®
Classrooms
@
Public
Areas
REMOTE
IN
Note:
The
PT-302
operates
on
positive
or
negative
SYNC.
The
SYNC
inverting
switch
is
factory
preset
to
the
‘““NOR-
MAL”
position
for
negative
SYNC.
For
positive
SYNC
set
the
switch
to
the
“REVERSE”
position.
During
installation
set
the
SYNC
invert
switch
for
the
appropriate
SYNC
polarity.
~#—_
REMOTE
CONTROL
CABLE
(opticonal)
ET-11C15.......
ET-11C30.......
ET-11C50.......
50
feet
(15
m)
100
feet
(30
m)
164
feet
(49.5
m)
GRRE
EE
Entertainment
System
1
This
system
is
ideal
for
use
for
parties,
ceremonies,
etc.
to’
be
held
in
large
places.
Great
effects
are
possible
with
the
powerful
video
images
from
colour
video
projectors,
when
combined
with
video
cameras
and
audio
equipment.
Applications:
@
Banquet
Halls
@
Lounges
Discos
Video
Camera
aaa
1
Remote
Control
_
Monitor
Unit
Effects
AV
Switcher
Controller
Monitor
Microphone
[
¥y
7
---
aa
Es
Controller
Audio
Mixer
Amp
-
Monitor
Pa
i
=
i
Wireless
Microphone
Tuner
Wireless
Amp
ERSTAIMIPILIERS
Business
Application
This
system
is
designed
to
concentrate
on
data
presentations
for
business,
con-
ferences,
showrooms,
etc.
Its
superb
re-
solution
and
capacity
to
match
various
types
of
personal
computers
make
it
ideal
for
upgrading
office-automation
systems
and
diversifled
video/data
services.
Applications:
®
Conference
Rooms
@
Training
Areas
@
Information
Displays
ae
I
en
HO
Video
Projector
-————__——]
7
feos]
[
¥
Special
Video
Camera
_
Monitor
Generator
AV
Switcher
Gal
Sa
—
Pcl
Screen
Hi-Fi
VTR
Monitor
Video
polices
ene
grttctt
His
T
ee
oe
ices
cea
v
ae
Had
Vo
'
t
!
VTR
!
rr
en
i
j
7
Video
Projector
i
i
I
OM
eR
Hm
Mtn
SHOE
RON
ONG
nl
en
nenpncenteeon
omen
:
RGB
Interface
——
Computer
~T
|
Be
cece
enw
ae
eer
rannsieramanraes
crane
BREE
EE
&
Entertainment
System
2
This
system
is
particularly
suited
to
such
recreational
facilities
as
bars,
restaurant,
dance
clubs,
etc.
A
wide
variety
of
atmos-
pheric
effects
can
be
produced.
When
used
together
with
stereo
sound,
a
re-
laxed
aura
of
“background
video“
and
“mood”
music,
or
dynamic
video
images
with
music
with
a
beat
to
match.
Applications:
@
Lounges
Discos
@
Restaurants
Hi-Fi
VTR
Monitor
Controller
Hi-Fi
VTR
r-
U
!
Monitor
'
Controller
a
a
a
eer
1
‘
—[
J
O
Monitor
Microphone
Turntable
a
a
ERIAIMPPILIERS
Educational
System
Ideal
for
a
wide
range
of
educational
acti-
vities,
particularly
as
an
effective
teaching
aid.
Applications:
@
Classrooms
®
Auditoriums
@
Lecture
Halls
Screen
{
Video
Projector
Ce
|
AV
Switcher
=
reas)
rot
Jt
Audio
Mixer
Amp
PT-302
rv
t
1
-~
eall--!
Microphone
AV
Switcher
aay
[
=
|
Video
shea
ctor
PT-302
PT-302
DISASSEMBLY
INSTRUCTIONS
5)
“G”-Board
5.
HOW
TO
REMOVE
THE
PROJECTOR
TUBE
1.
HOW
TO
REMOVE
THE
TOP
COVER
4,
HOW
TO
OPEN
THE
PRINTED
CIRCUIT
BOARD
©
Remove
2
screws
@
in
fig.
8.
(WHEN
RED)
1)
Open
the
cover
of
control
panel.
1)
Cand
D,
V-Boards
@
Then
pull
the
G"-Board
toward
the
back
side
of
1)
Remove
the
two
retaining
2
screws
(L)
from
the
tube
2)
Remove
3
screws
()
in
fig.
2.
@
Loosen
2
screws
©)
to
counterclockwise
by
90°
in
the
deck,
and
carefully
lift
it
to
open
the
'G”
Board.
shown
in
fig.
12.
3)
Then
pull
the
Top
Cover
toward
the
back
side
of
the
fig.
5.
2)
Remove
the
lens
grill
shown
in
fig.
3.
(Remove
4
screws
deck
and
carefully
lift
it
for
removal.
@
The
lift
the
rear
of
the
chassis
to
open
the
“C",-
®).
3)
Remove
the
anode
lead
@)
from
the
high
voltage
distributor
shown
in
fig,
13.
4)
Remove
the
LR
printed
circuit
board
(N)
in
fig.
13.
5)
Remove
the
retaining
screw
of
the
neck
shield
©)
and
“D"
V-Board.
D-Board-7”
M-Board
3
screws
2
screws
G-Board
remove
the
neck
shield
©
in
fig.
13.
w
@
(3)
6)
Remove
the
retaining
screw
of
the
deflecting
coil
@
Fig.
8
and
draw
out
the
centering
magnet
®
and
the
diflecting
Cover
of
6)
“K’’-Board
coil
S)
in
fig.
13.
<
control
panel
@
Remove
the
Front
Panel.
7)
Remove
the
grounding
lead
from
the
tube.
@
Then
carefully
pull
and
lift
the
Terminal
Panel
for
8)
Remove
the
4
retaining
screws
@®
from
the
tube
and
removal
in
fig.
9.
draw
it
out
shown
in
fig.
14.
@
Remove
2
screws
(1)
in
fig.
10.
2)
“A’
-
“B"-Boards
@
Then
lift
and
pull
out
the
““K’'-Board.
@
Remove
a
1
screw
©
in
fig.
6,
and
remove
the
P.C-Board
fixing
metal.
Fig.
2
@
Then
carefully
pull
and
lift
the
‘A’
and
B”
Boards
for
removal.
2.
HOW
TO
REMOVE
THE
LENS
GRIL
1)
Remove
4
screws
in
fig.
3.
2)
Remove
the
Lens
Gril.
Terminal
anel
Lens
Gril
pi
P.C
Board
Fixing
Metal
Fig.
6
3)
"F’-Board
@
Remove
a
1
screw
©
in
fig.
7,
then
open
the
F”-
Board.
Fig.
3
3.
HOW
TO
REMOVE
THE
CONVERGENCE
CONTROL
COVER
1)
Open
the
cover
of
control
panel.
7)
“P”
and
‘‘Q’’-Boards
@
Remove
the
Front
Panel!
and
Terminal
Panel.
@
Remove
2
screws
YQ)
in
fig.
10.
@
Remove
4
screws
()
in
fig.
11,
and
lift
the
box
cover.
4
screws
(T)
@
Then
open
the
‘’P”’
and
‘‘0’'-Boards.
ee
2)
Remove
a1
screw
©)
in
fig.
4.
3)
Then
pull
the
Convergence
Control
Cover
toward
the
control
panel
side
for
removal.
Cover
of
Convergence
Box
cover
control
panel
control
cover
1
screw
©
Fig.
7
4)
“M"-Board
@
Remove
3
screws
@)
in
fig.
8.
@
Then
pull
the
‘’M’’-Board
toward
the
back
side
of
the
deck,
and
carefully
lift
it
to
open
the
‘‘M"’-Board.,
Fig.
4
Fig.
14
nl
fe)
:
-
Oo.
e
ANY
;
;
OLR
AS
LA
AT
ZAR
veLai\d
L
|
;
rave
wt
=
E
ie
VOLO,
<
g
\
G
TN
J
3
Se
|
/
W\-
°
38
eI
|
:
Be
Vek
fs
i
23
:
POW
ei
<
se
f
2
Q
Q
r
;
&
;
d
fs
a
oe
Fig.
15
PT-302
CAUTIONS
FOR
SERVICING
HORIZONTAL
OSC.
DISABLE
CIRCUIT
TEST
REPAIR
PROCEDURES
OF
THE
HORIZONTAL
This
test
must
be
made
as
a
final
check
before
the
set
is
OSCILLATOR
DISABLE
CIRCUIT
returned
to
the
customer.
1.
Connect
a
DC
voltmeter
between
capacitor
C1413
+
1.
With
the
chassis
case
removed,
supply
a
nominal
120V
on
the
D-PCB
and
chassis
ground.
If
approximately
AC
to
the
set,
and
turn
the
set
on..
150V
is
not
present
at
that
point
find
the
cause.
Check
2.
Set
the
customer
controls
to
normal
operating
positions.
R535,
R591,
R1430,
R534,
C1413
and
D1408.
3.
Locate
Q1404
and
short
it’s
collector
to
the
emitter
2.
Connect
a
DC
voltmeter
between
capacitor
C518
+
on
with
a
jumper
wire.
Confirm
that
this
shorts
the
high
the
C-PCB
and
chassis
ground.
C518
+
potential
varies
voltage
and
that
the
raster
disappears.
from
nearly
OV
approx
to
nearly
4V
approx
when
4.
|f
this
does
not
occur,
the
Horizontal
Osc.
Disable
shorting
Q1404
(C-E).
If
this
does
not
occur,
find
the
Circuit
is
not
operating.
Follow
the
Horizontal
Oscil-
cause.
Check
R530,
R531, R537,
R538, R539,
R540,
lator
Disable
Circuit
Repair
Procedures
before
the
set
is
R541,
R542, R543,
R544,
C513,
C518, C519, C520,
returned
to
the
customer.
D507,
0510,
Q511
and
O512.
NOTE:
The
power
on/off
switch
must
be
turned
off
and
3.
Carefully
check
the
above
specified
parts
and
related
then
on
to
restore
operation.
circuits
and
parts.
When
the
circuit
is
repaired,
try
the
Horizontal
Oscillator
Disable
Circuit
Test
again.
4.
In
case
that
at least
one
of
R535, R591, R534,
D507,
and
the
FBT
is
replaced
follow
the
Adjustment
Pro-
cedure
for
the
Horizontal
Oscillator
Disable
Circuit
as
follows.
+27V
To
1C401
Pin
®
R542
R541
Q511
2SB709A
0.01
D1408
R1430
RvU1
220
R531.
+}
C513.
+]
C518
FBT
PULSE
Q512
2SD601A
QA207M3
—i2-—