Tatung CM-1480 Operating and installation instructions

SERVICE
INFORMATION
MODEL
CM-1480
COLOUR
DISPLAY
MONITOR
Code
No.
79-1191-2
..
,,.,,
...
:

CM-1480
SERIES
COLOUR
DISPLAY
MONITOR
SERVICE
MANUAL
PAGE
CONTENTS
CHAPTER
1.
SPECIFICATIONS
........
·····················
.1.1
CHAPTER
2.
PRECAUTIONS
AND
NOTICES
2-1
SAFETY
PRECAUTIONS
.............
·········
2.1
2-2
PRODUCT
SAFETY
NOTICE
...........
········
2.1
2-3
SERVICE
NOTES
............
·············
..
2.2
CHAPTER
3.
OPERATING
INSTRUCTIONS
3-1
CONTROLS
AND
CONNECTIONS
..........
······
3.1
3-2
SET
UP
AND
OPERATION
............
········
3.2
CHAPTER
4.
ADJUSTMENTS
4-2
MONITOR
ADJUSTMENT
DEVICES
.........
·····4.1
4-3
PREPARATION
...........
·················
.4.2
CHAPTER
5.
TROUBLE-SHOOTING
CHARTS
5-1
ORGANIZATION
.............
···············
5
.1
5-2
SAFETY
GUIDELINES
..............
·········
5.1
5-3
AC
LEAKAGE
TEST
...........
············
..
5.2
5-4
SUGGESTED
TOOLS
AND
EQUIPMEMT
..........
·5.2
5-5
INSPECTION
AND
PREPARATION
...........
···5.3
5-6
COLOR
BAR
TEST
..............
········•···
5.
3
5-7
WHITE
FIELD
.................
···········
.5.3
5-8
TROUBLESHOOTING
CHARTS
............
······
5.3
.-

CHAPTER
6.
P.
C.
B
LAYOUT
Fig
6-1
PCB-MAIN
COMPONENtS
LAYOUT
.........
·6.1
Fig
6-2
PCB-VIDEO
DRIVE
COMPONENTS
LAYOUT
...
6.2
Fig
6-3
PCB-CRT
DRIVE
COMPONENTS
LAYOUT
.....
6.2
Fig
6-4
PCB-POWER
COMPONENTS
LAYOUT
.........
6.3
CHAPTER
7.
SCHEMATIC
DIAGRAM
Fig
7-1
MAIN
CIRCUIT
DIAGRAM
...........
·····7.1
Fig
7-2
POWER
CIRCUIT
DIAGRAM
...........
····7.2
CHAPTER
8.
REPLACEMENT
PARTS
LIST
8-1
ASSEMBLY
AS/lIS
..........
·.··············
8.
1
8-2
ASSEMBLY
PCB-MAIN
PWB-1323-02
...........
8.1
8-3
ASSEMBLY,
PCB-VIDEO
PWB-1324-02
.........
8.7
8-4
ASSEMBLY,
PCB-CRT
DRIVE
PWB-1337-02
.....
8.9
8-5
ASSEMBLY.
pcB-POWER
PWB-1345-02
.........
S.
10
8-6
ASSEMBLY.
PCB-POWER
LINE
FILTER
PWB-1254-05
..............
·····
S.
12
8-7
ASSEMBLY.
PCB-INDICATOR
PWB-1357-01
.....
8.
12
8-S
MISCELLANEOUS
...............
············
S.
13
.-

APPLICATION:
POWER
INPUT:
VIDEO
SIGNAl.S:
SYNC.
SIGNAl.S:
CHAPTER
1
SPECIFICATIOIIS
Typical data display device for personal
computer
-applications.
90
watts
(Nominal),
AC
rated voltage-refer to
backcover
label. A2
metre
3-wire
mains
cord
is
supplied.
16
colour:
Red.
green.
blue
and
intensity
video
signals.
64
colour:
R.G,B,
and
r,g,b, (intensity) video signals.
All
are positive
TTL.
Horizontal:
15.75kHz
+/-
300Hz
(lode
1)
or
21.853kHz
+/-
300Hz
(mode
2)
positive
TTL,
autoswitching
by
TTL.
Vertical:
47-63Hz
positive
TTL
at
mode
1.
47-63Hz
negative
TTL
at
lode
2.
SIGNAL
CONNECTOR:
9-Pin D-shell connector.
DISPLAY
TUBE:
14".
90
deflection,
29.1mm
neck,
0.31.1 dot pitch.
dot
inline.
dark
tint
non-glare.
Type
No.:
M34JDU30X66
DISPLAY
AREA:
Width:
250mm
Height: 1700
DISPLAY
COLOUR:
Mode
1:
16
colours.
Mode
2:
64
colours.
DISPLAY
CHARACTER:
2000
characters
(80CH.
X25
Rowan
8x8
dot
.atrix)
DISPLAY
TIME:
RETRACE
TIME:
RESO
LUTI
ON
:
KISCONVERGENCE:
Horizontal:
mode
1:
44.5us
mode
2:
39.37us
Vertical:
mode
1:
12.58ms
mode
2:
16.01ms
Horizontal:
mode
1: 6.0us
mode
2:
6.0us
Vertical:
mode
1:
1.215
mode
2:
0.615
Horizontal:
640
dots
Vertical:
mode
1:
200
scan
lines (non-interlaced)
mode
2:
350
scan
lines (non-interlaced)
0.5mm
Max.
within data area.
USER
CONTROl.S:
Power
on-off, brightness, contrast.
vertical
size 1,
vertical size
2,
Multi
colour switch, horizontal centre
1.
horizontal centre
2.
video
reverse
SWitch,
power
voltage
120VAC/240VAC
selector.
SERVICE
CONTROLS:
H-Hold
1.
H-Hold
2.
H-Width
2.
H-Centre.
V-Centre.
V-Hold,
Focus.
Screen.
E-W
Pincusion. set
ERT.
R-Drive.
r-Drive.
G-Drive;
g-Drive.
R-BKG.
G-BKG.
B+12.75V.
ENVIRONMENTAL:
Operation:
10°C
to
35°C
ambient
Storage:
-40°C
to
50
0e
DIMENSIONS:
WEIGHT:
Humidity:
50%
to
80%
(non-condensing)
Altitude:
to
7000
feet
above
sea level.
365
(W)
X
315
(H)
X
400
(D)
••
13.Skg
(net)
1.1
.-

ENVIRONMENTAL:
DIMENSIONS:
WEIGHT:
Operation:
100e
to 35°e ambient
Storage: -40oe to
50
0e
Humidity:
50%
to
80%
(non-condensing)
Alitude: to
7000
feet
above
sea
level.
365
(W)
X
315
(H)
X
400
(D)
mm
13.5kg (net)
1.2
.-

CHAPTER
2
PRECAUTIONS
AND
NOTICES
2-1
SAFETY
PRECAUTIONS
1.
Observe
all
cautions
and
safety
related
notes located inside the
display cabinet
and
on
the display chassis.
2.
Operation
of
these displays outside the cabinet or with the cover
removed,
involves a
shock
hazard
from
the display
power
supplies.
Work
on
the display should not
be
attempted
by
anyone
who
is
not
thoroughly familiar with precautions necessary
when
working
on
high
voltage equipment.
3.
Do
not
install,
remove
or
handle the picture tube
in
any
manner
unless shatter-proof goggles are
worn.
People
not
so
equipped should
be
kept
away
while handling picture tube.
Keep
picture tube
away
from
the
body
while handling.
4.
The
picture tube is constructed to limit
X-RADIATION
to
0.5
mR/HR
at
300
microamperes
anode
current.
For
continued protection,
use
the
recommended
replacement tube only,
and
adjust the voltages
so
that
the designated
maximum
rating
at
the
anode
will not
be
exceeded.
5.
Before
returning a serviced display to the customer, a thorough
safety
test
must
be
performed
to verify that the display
is
safe to
operate without danger
or
shock.
Always
perform
an
AC
leakage
current
check
on
the
exposed
metallic parts
of
the cabinet.
Proceed
as
follows:
Connect
the monitor
power
lead
to
the
mains
supply, via
an
isolation
transformer,
and
switch
on.
Using
the
test
circuit
shown
in Fig.
2-
1,
measure
the
AC
leakage current
between
each
pole
(L
and
N)
of
the
supply
and
all
accessible metal parts.
The
earth leakage current
must
not
exceed
3.5mA.
MAINS
INPUT
L
N
..
-
==-
E
CONNEC
I~
EXPOSE
T
TO
o
METAL
PARTS
I~I
--
MEASURING
CIRCUIT
RESISTANCE.
2000
oh
ms
Fig
2-1
AC
LEAKAGE
CURRENT
TEST
CIRCUIT
2.1
.-

PRCDU8T
SAFETY
NOTICE
Xany
electrical
and
mechanical
parts in this chassis provide special
visual safety protection.
The
protection afforded
by
them
cannot
necessarily
be
obtained
by
using replacement
components
rated for
higher voltage, wattage, etc
..
Before
replacing
any
of
these
components,
read
the
parts
list
in
this
manual
carefully.
The
use
of
substitute replacement parts
which
do
not
have
the
same
safety characteristics
as
specified
in
the parts
list
may
create
shock,
fire,
X-RAY
radiation
or
other hazards.
2-3
SERVICE
NOTES
1.
When
replacing parts
or
circuit
boards,
wrap
the wires
around
terminals before soldering.
2.
When
replacing a
high
wattage
resistor
(more
than
1/2W)
on
a
circuit
board,
keep
the
resistor
about
10mm
(1/2
in.)
away
from
circuit
board.
3.
Keep
wires
away
from
high
voltage or
high
temperature
components.
4.
Keep
wires
in
their
original position
so
as
to
reduce
interference.
,
"ARMIIIG
I
CHECK
POWER
VOLTAGE
SELECTOR
IS
CORRECT
120
VAC
OR
240
VAC
.-
-...
..........
-"

CHAPTER
3
OPERATING
INSTRUCTIONS
3-1
CONTROLS
AND
CONNECTIONS
;"
POWER:
The
power
rocker switch turns the 1I0nitor
on
or off.
o
MULTI
COLOUR
INDICATOR:
A
green
LED
lights
when
the 1I0nitor
is
switched
on
with colour displayed
on
the
normal
state.
Push
Multi-colour switch
on
the
front
to
appropriate position for desired
:!<
BRI
GHTNESS:
*
CONTRAST:
f,c
120/240VAC
SELECTOR:
*
V.
SIZE
(1
and
2):
*
H.
PHASE
(1
and
2):
i.e
POWER
INPUT
JACK:
~e
POWER
LEAD:
display.
The
brightness control sets the overall or
average intensity
of
illumination
of
the dis-
play
The
contrast control sets
the
intensity
of
the
data displayed.
The
selector switch adapts the monitor for
operation
from
the local
AC
power
source.
The
vertical size adjustments
(mode
1
and
mode
2)
set the
amount
of
vertical
(top to
bottom)
raster deflection.
The
horizontal
phase
adjustments
(mode
1
and
mode
2)
set the horizontal
(left
to right)
position
of
the
display within the
raster
area.
A3-pin
power
connector
is
located
on
the rear
panel.
A
2m
3-wire
mains
lead connects
power
to
the
monitor.
::c
VIDEO
SIGNAL
CABLE:
A 1.
5m
cable, terminated
with
a 9
Pin
D-type
connector, supplies
video
and
sync. signals to
the
monitor.
The
cable
is
attached
to
the
monitor
and
is
not
detachable.
Fig
3-1
illus-
trastes
the
D-type
connector.
Table
3-1
lists
the
connector signal for
each
mode
of
opera-
tion.
~c
VIDEO
REVERSE
SWITCH:
Move
the switch to reverse the
background
and
image
colours.
3.1
.-

3-2
Set
up
and
Operation:
Perform
the
following steps
to
set
up
and
operate the monitor.
1.
Place
the
monitor
on
a
flat
surface near
the
computer
and
near
an
AC
power
outlet.
Be
certain that
the
ventilation
slots
in
the
cabinet
are-
not
blocked
or
obstruc.ted.
2.
Connect
the
video
signal cable
from
the
monitor
to the
computer.
3.
Plug
the
power
cord
into
the
monitor
and
then
into
an
AC
outlet.
Be
certain that
the
120/240
VAC
selector switch
on
the rear panel
is
set
to
the
correct position.
WARNING:
Removing
the earth
from
the
AC
power
source aay present a
potentially lethal
shock
hazard.
4.
Turn
on
the
computer
and
the
monitor.
The
front
panel
green
LED
should
light.
The
system
prompt
for
the
computer
should
be
dis-
played.
5.
Adjust
the
left
panel
brightness
and
contrast controls to obtain a
comfortable display.
If
your
CM-1480
monitor
requires service, refer to the controls
and
adjustments information
of
this
publication
and
verify that
all
controls
and
adjustments
on
the display are correctly set.
If
your
monitor
does
require service,
it
must
be
returned
with
the
mains
lead.
Table
3-1
Pin
Ho.
1
2
3
4
5
6
7
8
9
Fig
3-1
9-Pin
Colour
Monitor
Signal
Cable
Description
Mode
1
Mode
2
Shield
Gnd.
Ground
Signal
Gnd.
r
Red
R
Green
G
Blue
B
Intensity g
Unused
b
Horiz. sync. Horiz.
sync.
Vert. sync. Vert.
sync.
.
3.2
.-
....
.........
-"

4-1
CHAPTER
4
ADJUSTMENTS
This
chapter
~ontains
instructions for
performing
the
various
monitor
adjustments.
Because
these adjustments are
performed
while
the
monitor
is switched
on,
observe
proper
precautions
to
avoid
personal injury.
Specific
warnings
are included
where
necessary.
Paragraph
4-2
lists
the various adjustment devices
and
their
component
numbers.
They
are arranged according
to
the
circuit
board
or
location
where
they
can
be
found.
If a particular adjustment
does
not
correct a
problem,
refer
or
section 5 for additional information.
4-2
Monitor
Adjustment
Devices
DEVICE
R208
R209
R526
R527
R566
R567
R523
R563
R593
R309
R306
R366
R326
R408
R468
R433
R493
R413
R473
R435
R333
R907
R451
):t
R813
Focus
G2
EXTERNAL
DESCRIPTION
Left
panel
brightness control
Left
panel
contrast control
VIDEO
BOARD
(PWB-1324)
Primary
red
drive
Secondary
red
drive
Primary
green
drive
Secondary
green
drive
CRT
BOARD
(PWB-1337)
Red
cut-off
Green
cut-off
Blue
cut-off
MAIN
BOARD
(PWB-1337)
POWER
SUPPLY
OTHER
VR
VR
Vertical
hold
Vertical size, lode I
(Rear
panel)
Vertical size,
mode
2
(Rear
panel)
Vertical centring
Horizontal
hold,
mode
1
Horizontal
hold,
mode
2
Horizontal
width,
mode
1
Horizontal width.
mode
2
HQrizontal
phase,
lode
1
(Rear
panel)
Horizontal phase,
lode
2
(Rear
panel)
Horizontal centring
E-W
pincus
ion
Sub-
brightness
22.5kV
EHT
B+
12.8
+/-O.lV
High
voltage
resistor
block
High
voltage resistor
block
4.
,
.-
....
"'"-."

4-3
PREPARATION
Perform
the following steps
to
prepare the monitor for adjustment:
(1)
R~mave
the cabinet
back
to
access internal adjustments.
(2)
Turri
the
monitor
on
and
allow
it
to
warm
up
for approximately
30
minutes.
(3)
Read
each
adjustment procedure before performing
it.
1.
S+
ADJUSTMENT
The
switch-mode
power
supply
has
a
S+
output voltage adjustment
located within the unit. Variable
resistor
R813
sets the
12.80
vOC
output.
WARNING:
The
switch-mode
power
supply contains
circuits
that
gene-
rate
dangerous
high-frequency.
high
amplitude signals that
present a potentially lethal
shock
hazard. Exercise
extreme
caution
when
adjusting
or
working
near
this
unit.
Using
a
DVM.
measure
the
12.80V
B+
voltage
and
adjust
R813
to
obtain a reading
of
12.80V.
+/-O.lV.
R813
may
be
accessed through a
hole
labeled
B-ADJ
in the side
of
the
power
supply
enclosure.
2.
VERTICAL
HOLD
The
vertical
hold
adjustment prevents the display
frol
rolling
upwards
or
downwards.
Adjust
R309
to
stabilize
the display
by
tur-
ning
it
first
to
one
extreme
and
then
backing
off
until
the display
just
stabilizes.
Repeat
this procedure
from
the opposite
extreme
until
the display
just
stabilizes.
Set
R309
between
the
two
set-
tings that
stabilize
the display.
3.
VERTICAL
SIZE
The
vertical
size adjustment
sets
the
amount
of
vertical
(top to
bottom)
raster deflection.
The
vertical
size adjustments for
both
mode
1
and
mode
2 are located externally
on
the rear panel.
To
adjust
vertical
size;
(1)
Turn
the
G2
control clockwise
until
the
raster
just
appears.
(2)
Adjust
R306
(V.
SIZE
1)
or
R366
(V.SIZE
2)
for a
raster
height
of
170mm
+/-2mm
in
each
mode
1 or
mode
2 respechively.
(3)
Turn
the
G2
control counterclockwise
until
the
raster
just
disappears.
4.
VERTICAL
CENTRING
The
vertical
centring adjustment
shifts
the
whole
display
UP
or
down
within the
raster.
To
adjust centring:
(1)
Verify that the
vertical
size
is
cor!ect. Adjust
if
necessary.
(2)
Turn
the
G2
control clockwise
until
the
raster
just
appears.
(3)
Adjust
R326.
the
vertical
centring pot.
so
that
the display
is
centred
from
top to
bottom
within the
raster.
4.2
.-

(4)
iur~
the
Gi
control counterclockwise
until
the
raster
just
disappears.
5.
HORIZCNTAL
.HOLD
The
horizontal
hold
adjustment prevents the display
from
shifting
horizontally
and
breaking
up
in
diagonal segments.
To
adjust the
horizontal hold:
(1)
Connect
a
jump
lead
from
test
point
TP22
to
earth.
(2)
Adjust
R408
(mode
1)
or
R468
(mode
2)
to eliminate horizontal
tearing
and
restore horizontal hold.
(3)
Remove
the
jump
lead
from
TP22.
6.
HORIZONTAL
WIDTH
The
hor:zontal
width
adjustment
sets
the
amount
of
horizontal
(left
to
right)
raster
deflection.
To
adjust horizontal width:
(1)
Turn
the
G2
control clockwise
until
a
raster
just appears.
(2)
Adjust
R433
(mode
1)
or
R493
(mode
2)
so
that the display
width
is
25Cmm
+/-
2mm
in
each
mode.
(3)
Turn
the
G2
co~trol
counterclockwise
until
the
raster
just
disap~ears.
7.
HORIZONTAL
PHASE
The
horizcntal
phase
adjustment
sets
the
left-to-right
position
of
the display within
the
raster
area.
To
adjust horizontal phase:
(1)
T~rn
the
G2
central clockwise
until
the
raster
just appears.
(2)
Adjust
R413
(mode
1)
or
R473
(mode
2)
to centre the display
from
left
to
right within the
raster.
(2)
Tur~
the
G2
control counterclockwise until
the
raster just
disappears.
2.
HORIZONTAL
CENTRING
The
hcr:30ntal centring adjustment
shifts
the
whole
raster
from
left
to
right for
mode
2.
This
adjustment
is
only
present for
mode
2.
To
adjust horizontal centring:
(1)
Turn
the
G2
control clockwise
until
the
raster
just appears.
(2)
Adjust
R435
to centre the
raster
from
left
to
right for
mode
2.
(3)
Turc
the
G2
control counterclockwise
until
the
raster
just
disappears.
9.
RGB
DRIVE
~he
red
ar.d
green drive adjustments
set
the amplitudes
of
the red
and
green
CRT
drive voltages
relative
to
the blue drive voltage.
(There
is
no
blue drive adjustment.)
When
set properly.
all
three
.-

(RGB)
drive voltages will
be
the
same.
drive voltages:
(1)
Display
a
white
field.
To
adjust
the
red
and
green
(2)
Set
the
left
panel
contrast
and
brightness controls
to
maximum.
(3)
Using
an
oscilloscope,
measure
and
record
the
amplitude
of
the
blue
drive voltage
at
TP52B
on
the
CRT
drive board. This value
should
be
approximately
60
Vp-p.
(4)
Next,
measure
the
amplitude
of
the
red
drive voltage at
TP52R.
If necessary, adjust
the
two
red
(R
and
r) drive pots
(R526
and
R527)
so
that
the
amplitude
of
the
red
drive voltage
matches
that
of
the
blue
drive voltage recorded
in
step
3.
(5)
Measure
the amplitude
of
the green drive voltage at
TP52G.
If
necessary, adjust the
two
green
(G
and
g)
drive pots
(R566
and
R567)
so
that the amplitude
of
the green drive voltage
matches
that
of
the
blue
drive voltage recorded
in
step
3.
10.
HORIZONTAL
LINE
PRECISION
:he horizontal line precision adjustment sets the relative
contributions
of
the
R.
G,
and
B bias controls
to
produce
a
white
horizontal line. This adjustment
should
be
performed
under
low
light.
To
adjust
the
horizontal line precision:
(1)
Remove
the
input signal
from
the monitor. (Disconnect
video
cable
from
the computer.)
(2)
Set
the
left
panel
contrast control
to
maximum
and
the
left
panel
brightness control
to
minimum.
(2)
Set
the
R.G,
and
Bcutoff controls
(R523,
R563,
and
R593)
to
mid-pas
ition.
(4)
Set
sub-brightness control
R907
to
its
mid-position.
(5)
Adjust
G2
for
500
VDC.
G2
voltage
may
be
measured
from
the
foil
side
of
the
CRT
drive
board.
(6)
Connect
a
jump
lead
between
points M
and
N
on
the
main
board.
(7)
Turn
the R cutoff control
(R523)
counterclockwise
until
a
red
horizontal line
just
appears.
(8)
Turn
the G
and
B controls
(R563
and
R593)
counterclockwise
until
a
white
line
is
displayed.
(9)
Remove
jump
lead connecting points M
and
N.
(10)
Perform
the brightness level adjustment procedure
in
the
fol-
lowing
section.
11.
BRIGHTNESS
LEVEL
!he sub-brightness control
(R907)
sets the threshold for the front
panel
brightness control. This control should
be
adjusted with the
monitor
in .ode
2.
Adjust.ent should
be
perfo~ed
under
low
light.
.-

To
adjust,the brightness level:
(1)
Display a white
field
on
the
entire
screen.
(2) Set the. front panel brightness control to
minimum.
(3)
Adjust
R907
so
that the display
just
disappears.
1:.
E-W
PINCUSHION
T~e
E-w
pincushion adjustment reduces the horizontal pincushion
distortion
of
the
raster.
(Pincushion
distortion
is characterized
by
sides
of
the display
which
bow
inward,
especially
toward
the
centre
of
the display.)
:Jis
control should
be
adjusted with the monitor in
mode
2.
To
adjust the
E-W
pincushion:
Jisplay a crosshatch pattern.
Adjust
R333
so
that
any
horizontal pincushion
distortion
is
corrected.
13.
FOCUS
The
:ocus adjustment (the
upper
control
on
high-voltage
resistor
block' varies the
focus
voltage
to
produce
the sharpest display
detail.
To
adjust the focus:
(1)
Display a dot
test
pattern.
(2) Set the front panel contrast
and
brightness controls for a
comfortable display.
(3)
~ijust
the
focus
control for best overall focus.
centre. top centre,
bottom
centre,
left
centre.
centre areas
of
the display for
good
focus.
Check
the
and
right
(4)
Verify acceptable overall focus using the
fill
screen
test
with
such
characters
as
@
and
#.
14.
STATIC
CONVERGENCE
Static convergence adjustment refers
to
setting
each
electron
beam
so
that
all
three
beams
(red, green
and
blue)
hit
the
same
spot.
When
all
three
beams
hit
the
same
spot
on
the
CRT
mask
with equal
intensity, a white dot appears
on
the screen.
This
adjustment
should
be
performed
under
low
light.
NOTE:
Read
the entire procedure thoroughly before performing
this
adjustment.
To
adjust
static
convergence:
(1)
L:cate the
convergence
magnets
on
the
neck
of
the
CRT.
Identify the 4-pole, 6-pole
and
purity
magnets.
(2)
~ark
the present position
of
the
magnets
by
drawing
a pencil
line along the sides
of
all
the magnets. This will give
you
a
reference point in case the adjustment
becomes
difficult.
(3)
Carefully
remove
the clear adhesive glue
which
holds the
magnets
in place.
The
glue
may
be
scraped
away,
but
be
careful
not
to
damage
the
CRT
neck.
.-
, i
;r
~
I

\4)
Rotate the 4-pole
and
6-pole
magnets
slightly
to
loosen
them.
(r:
\
Do
not
force
them:
slo~ly
work
them
back
and
forth
until
they
can
be
moved
~ith
only
moderate
effort.
Do
not
rotate the
p:.:r
ity
magnet.
~~rn
the
monitor
on
and
allow
it
to
warm
up
for approximately
30
minutes.
(5) Display a crosshatch pattern.
(7' Separate the three colours (red, green,
and
blue) horizontally
and
vertically.
This is accomplished
by
rotating the 4-pole
and
5-pole
magnets
until
the three colours are
visible.
The
resulting display
shows
three
distinct
horizontal lines (red,
g~een,
and
blue) instead
of
one
white horizontal line throug-
heut
the display. Similarly. the
white
vertical
lines are
now
sp~it
into three
distinct
vertical
lines (red, green,
and
t
~!le)
.
(3~
Superimpose
the
red
and
blue horizontal lines
at
the centre
of
the
screen. This
is
accomplished
by
rotating both tabs
of
the
4-p~le
magnets
simultaneously
until
the red
and
blue lines
overlap
to
form
one
magenta
line.
Use
a
lOX
or
better
magni-
fier
to
more
precisely adjust the overlap
once
the line ap-
pears
magenta
to the unaided
eye.
(9)
Superimpose
the
red
and
blue
vertical
lines
at
the centre
of
the
screen. This is accomplished
by
changing the angle
between
the 4-pole
magnets
until
the red
and
blue
lines overlap to
form
one
magenta
line.
Use
a
lOx
or
better
magnifier to
more
~recisely
adjust
the
overlap
once
the line appears
magenta
to
the
unaided
eye.
(10)
Verify that the
red
and
blue horizontal
and
vertical
lines are
now
superimposed
and
appear
magenta.
Because
these adjustments
are
magnetic
in
nature. they are
somewhat
interactive.
Repeat
the previous
two
steps
if
necessary.
(11)
Superimpose
the
magenta
and
green horizontal lines
at
the
center
of
the screen. This is accomplished
by
rotating
both
tabs
of
the 6-pole
magnets
simultaneously
until
the
magenta
and
green lines overlap
to
form
one
white line.
Use
a
lOx
or
better
magnifier
to
more
precisely adjust the overlap
once
the
line appears white
to
the unaided eye.
(12)
Superimpose
the
magenta
and
green
vertical
lines
at
the centre
of
the screen. This is accomplished
by
changing
the angle
between
the 6-pole
magnets
until
the
magenta
and
green lines
overlap to
form
one
white line.
Use
a
lOx
or
better
magnifier
to
more
precisely adjust the overlap
once
the line appears
white
to the unaided eye.
(13) Verify that the
magenta
and
green horizontal
and
vertical
lines are
now
superimposed
and
appear white.
Because
these
acjustments are magnetic in nature. they are
somewhat
interac-
tive.
Repeat
the previous
two
steps
if
necessary.
4.6
.-

(14)
Verify overall
convergence
by
once
again
examining
the cross-
hatch
pattern.
Check
the
horizontal
and
vertical lines
at
the
centre
of
the screen for proper convergence.
Repeat
any
steps
as
neq!ssary.
15.
ADJUSTMENT
AN~TEST
LOCATION
(1)
PCB-MAIN
adjustment
and
test location.
(See
Fig
4-1)
(2)
PCB-VIDEO
DRIVE
adjustment
and
test
location.
(See
Fig
4-2)
(3)
PCB-CRT
DRIVE
adjustment
and
test
location.
(See
Fig
4-3)
(4)
PCB-POWER
adjustment
and
test
location.
(See
Fig
4-4)
,I
JI

D
Q201 D
o 0
0010202
~t=oO=9==~D
°c~~I
0 0
P209
V
L-I
___
I 0213 0201
0215
0216 0
0211
P204
P205
Q D
C471
D D
Q404
D
CD
CD
CJ04
R333 V
D V
Q301 C30J C304
D
CD CD
Q401
R409 R469
L401
<j
R469
CD
Q405
Q305 R433
CD
CD
0
R326 R435
<J
I
OP4Q1
D°l
Q408
P404
P403
(]
T401
0
Q402 0
0
o
0411
D D
(]
T402 0 T403 0
D C406 0
Q409
o
Q410
Q412 0
CD
CD
R309
em
R306
em
R366
R907
em
R413
CD
Q
R451
Q413
t·on
d
test
loca 1
Fig
4-1
PCB-MAIN
adjustment
an
.
/I 0
0
0
0 0

a
0572
P213
a a a
(]
(]
0571
0542
0541 0502 0501
CD
CD CD
CD
R567 R566 R527 R526
D D
0573 0503
D
Q543
P214
D
D~
D~
a..
Q20B
00207
a
DQ203
Q
D Q210
D Q209
0206
......
D~
D~
a..
Fig 4-2
PCB-VIDEO
DRIVE
adjustment
and
test
location
CD CD
0505
R523
R593
oa Q575
Q576 I
~57~
I
&0
0506
P901
/Q504/
099
0
KB
KR
o
G20
o
KG
0
G10
o
0546
CD
c::J R563
Q54)
a
0545
I J
P902
Fig 4-3
PCB-CRT
DRIVE
adjustment
and
test
location
,
I
-
.-

T801
CD
R813
0801
R803
D
6
Q803
o
Q802
D
RBI5
Q801
F801
D
RB02
le801
Fig 4-4
PCB-POWER
adjustment and,
test
location
4.10

CHAPTER
5
TROUBLESHOOTING
This
chapter provides information
on
troubleshooting
the
CM-1480
colour
display monitor.
Enough
information
is
included
to
assist in diagnosing
most
faults
to
the
major
component
level.
5-1
ORGANIZATION
General
troubleshooting information is included in
the
each
paragraph
of
this section.
Read
these paragraphs
before
proceeding.
They
contain
safety guidelines, tests
and
diagnostics,
and
other important informa-
tion.
Following
this general information
is
a series
of
troubleshooting
flowcharts.
These
charts are designed
to
assist
in
diagnosing faults
to
the
major
component
level.
Always
begin
with
the
General
Troubles-
hooting Chart.
This
chart will direct
you
to
an
adjustment or
to
a
more
detailed chart.
5-2
SAFETY
GUIDELINES
Read
the
following safety notes carefully before attempting
to
troubleshoot
or
repair this monitor.
WARNING;
The
anode
of
the
CRT
retains a potentially lethal voltage
when
the
monitor
is turned off.
Perform
repairs
only
after
the
CRT
has
been
properly discharged.
Refer
to
Fig
5-1
and
the
following
procedure
to
discharge
the
CRT
anode:
(1)
Connect
a clip
lead
or
heavy
gauge
wire
to
chassis
ground.
(2)
Connect
the
other
end
of
the
lead
to
the
stem
of
a
flat
blade
screwdriver that
has
an
insulated handle. •
(3)
Insert
the
blade
of
the
screwdriver
under
the
rubber insulation
that covers
the
anode
lead
on
the
CRT
and
make
contact
with
the
anode
terminal.
Depending
on
the quantity
of
charge
present
on
the
anode,
a distinct
snap
lay
be
heard
as
the
CRT
discharges.
Allow
approx
3
seconds
for
the
CRT
to
discharge completely.
Fig
5-1
CAREFULLY
SLIDE
A
GROUNDED
FLAT
SCREWDRIVER
TIP
UNDER
THE
LIP
OF
THE
ANODE
LEAD.
AFTER
DISCHARGING
THE
VOLTAGE
DISCONNECT
THE
ANODE
LEAD
FROM
THE
CRT.
.-
Table of contents
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