Panasonic C1381 User manual

ORDER NO. KME9010170C3
ervice
Manual
Color Computer Display
C1381
Chassis
No.
KMX-F407E
CONTENTS
Page
SAFETY
PRECAUTIONS.
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CONTROL
LOCATIONS
AND
OPERATIONS...
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4
SPECIFICATIONS
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DISASSEMBLY
INSTRUCTIONS
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10
GENERAL
CONNECTION
&
APPLICATIONS.
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ELECTRONIC
CIRCUIT
DESCRIPTION
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ADJUSTMEN Tivosees 8 acai dete OS oes een ae a hob RS OR 15
COMPONENT
REFERENCE
GUIDE...
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TROUBLESHOOTING
FLOW
CHART...
0.2...
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22
BLOCK DIAGRAM § fii soe eas Bares ee a Ee i He Ee ee 29
CIRGUIT: BOARD ®: occcce Sig ah ok A gt OES le A a diay cgi aa 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 eee 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—

2.
3.
a)
b)
d
e)
f)
g)
h
i)
x
m})
Back Cabinet Removal
a) Remove 4 screws © and 3 screws ©) from the
back cabinet. :
b} Remove the back cabinet. -
PWB Assembly Removal
Caution: When servicing or replacing the CRT, discon-
nect the anode and discharge the anode
completely, as high voltage (24.5kV} may
remain on the anode for an extended time
after power off.
Unplug the neck board (C-board) from the CRT neck.
Unplug the DY connector, AC switch connector, degauss-
ing coil connector from the main board (A-board).
Unplug connectors CO-2C, CO-4C, CO-6C and CO-7C
from the neck board (C-Board).
Discharge
the
remaining
static
electricity
by
shorting
between
anode
and
the
CRT
frame
ground.
Disconnect the anode spring from the CRT.
Remove
2
screws
®
and
2
screws
(F)
from
signal
cable
bracket.
Remove
1
screw
G)
from
the
base
frame
to
remove
GND wires.
Remove
1
screw
(H)
from
the
base
frame
to
remove
AC cord GND wire.
Remove
2
screws
oO
from
the
base
frame
to
remove
the GND wire of the CRT.
Remove 2 screws ©) from the AC Inlet bracket.
Remove 2 screws ) from the AC Inlet.
To remove the AC Inlet, unsolder A103, 7
aa on the main baord (A-board).
Remove 4 screws (L) from the main board (A-board).
Remove the main board (A-board) together with the
neck board (C-board) from the base frame.
Front
cabinet
©
Figure 20
Neck board
(C-board)
AC Inlet
bracket
() AC inter
Pa bs foe
Ovenneee
Anode
seeageceemaaaneeaan "s
Seeuenneestunanetas SUCSROeNESOCOReAESS
depeune = aes bansaoueer
seeasasen
opocese
petncsaee
sdeanasnaeenanseeas
Figure 19
i,

Om RCTs a
5. AC Switch Removal
a) Remove 2 screws (MW) from the base frame to separate
it from the front cabinet.
b) Remove the AC switch button from the AC switch,
c) Remove 1 screw (&).
d) Remove the AC switch from base frame.
Figure 21
6. CRT Removal
* CRT is supplied as ITC.
a) Remove 4 screws ©) from the front cabinet.
b) Remove the CRT from the front cabinet.
Caution: Do not lift the CRT by the neck.
= 42
Base frame
AC switch button
Figure 22
AC switch
CRT
Figure 23
Front cabinet
i,

GENERAL
CONNECTION
&
APPLICATIONS
Pin
connection
of
cable
adaptor
for
personal
computer
with
15
pin
output
terminal
15 Pin mini D-SUB type connector
Personal Computer
Computer Display
15 Pin mini D-SUB type connector
Figure 24
Pin Assignments for IBM Graphics Adaptors
Pin No. Signals | Remarks
Red |
Green
=
Blue
Ground
Ground
Red Ground
Green Ground
Blue Ground
Key N.C,
Co oOo ON OO oO FF WY ND
Ground
11 M. Sense 0 Ground
12 M. Sense 1 N.C.
13 Horizontal Sync.
14 Vertical Sync.
15 Reserved N. Cy
pees ce
oe

|
ELECTRONIC CIRCUIT DESCRIPTION
e Over Voltage Protection Circuit
+13V +13V
Figure 25
a. According to the change of secondary output voltage,
the output voltage of D805 changes.
b. When the secondary output voltage increases abnormally,
the equivalent voltage to the change is detected from
D805, and D807 conducts.
As a result the pin 10 voltage of 1C801 increases.
c, When the pin 10 voltage of IC801 increases and exceeds
the reference voltage, the comparator turns on and the
Q809 base voltage decreases.
@ Horizontal Osc. Disable Circuit
1C5002
Figure 26
a. A pulse from the FBT is rectified and smoothed by
D553 and C560. R567 and R566 share the voltage drop.
—14—
D553
. By the decrease of Q809 base voltage, the emitter
current increases causing the pin 9 voltage of IC801 to
decrease.
. By decreasing the pin 9 voltage of |1C801, the pulse width
of pin 14 becomes too narrow.
By this operation, the secondary output voltage decreases.
R534
FBT
b. If the high voltage rises, the shared voltage rises and
turns D555 on. _ os
Parnes
By this, horizontal osc. disable circuit in 1C5002 turs on.
. Result of this, the frequency of the horizontal osc. rises
and it works to decrease the high voltage.

ADJUSTMENT
Service Adjustment Control Locations
Main Board
(A-Board)
TP803
TV evttcareees CONTRAST (R3115)
2 isietess BRIGHT (R3116)
Sscsineatiens H. SIZE (R514)
Qecisetateacs H. CENT. (R515)
Dastecitates V. SIZE (R445)
Bsineyiverend V. CENT. (R444)
Pssigsineiets H. H. HIGH (35 kHz) (R502)
Bookends H. H. LOW (31 kHz) (R525)
Soper V. CENT, PRE. (R4060)
(Parts Side View}
26 25 24 23 22 21
Figure 27
TO rs cecints SUB. V. SIZE (R408)
Wess V. LIN. (R416)
IQ: cceesvees H. V. ADJ. (R577)
V3 shine PINCUSHION (R456)
VAN ete H. SIZE PRE. (R512)
TS eaves H. CENT. PRE (R5015)
TO ecissverts. SUB. CONT. (R3124)
Vd eis SUB. BRIGHT (R3126)
Cs ener eee B+ ADJ. (R826)
a5 =
my
19 sscseses FOCUS
710 ee SCREEN
7 ene VIDEO-BIAS (R3580)
22th ok B-DRIVE (R3503)
DSi oceate R-DRIVE (R3501) :
OAs cstints B-CUT OFF (R3512) ne
25 eee R-CUT OFF (R3510)
26.aues) G-CUT OFF (R3511)

ere Condition:
e AC 220V,50 Hz
e VGA and SVGA Signals
Test Points and Service Adjustment Controls:
Refer to page 15.
Test Equipment:
e Oscilloscope
e Digital Voltmeter
e Frequency Counter
e H, Frequency Detective Coil
e High Voltmeter
¢ Digital Photometer
1. Power Supply
1-1.
1-2.
B+ Voltage Output Adjustment
(See B-4 of Page 31)
a) Apply a VGA signal to the unit.
b) Apply 220V AC to the unit.
c) Connect a digital voltmeter between TP91 and
ground.
d) Turn the unit on.
e) Adjust R826 (B+ ADJ.) to 99V + 1.5V.
f) Vary the AC input voltage from 220V to 240V and
confirm the voltage is 99V + 1.5V.
g) Apply the normal AC voltage (220V AC) to the unit.
h) Confirm the voltage across C85? is 15.0V + 0.5V.
i) Confirm the voltage across C858 is 27.0V + 0.2V.
j) Confirm the voltage between D5003 anode and
cathode is 5V + 0.3V.
k) Confirm the voltage across 1C504 pin 3 and ground
is 12V + 0.5V.
1) Confirm the voltage across D558 is 20V + 1V.
Confirmation of Protection Circuit
(See A-5 of Page 31)
a) Apply a VGA signal and 220V AC to the unit.
b) Apply exterior DC voltage to D805 cathode.
c) Connect a digital voltmeter between D805 cathode
and ground.
d) Turn the AC switch on and confirm that the unit is
receiving the VGA signal.
DC voltage up to 30V and
confirm that the unit stops operating.
e) Raise the exterior
2. H-Hold Tracking Adjustment
2-1
. Preparations
(See C-3 of Page 31)
Connect a short jumper between TP501 and ground to
make horizontal frequency in a free run condition.
— 16 —
2-2. H-Hold 31 kHz Adjustment
(See C-4 of Page 31)
a) Apply a VGA signal to the unit.
b) Turn R515 (H. CENT.) to set click position.
c) Adjust R525 (H.H. LOW) until horizontal move-
ment stops.
2-3. H-Hold 35 kHz Adjustment
(See C-4 of Page 31)
a) Apply a SVGA signal to the unit.
b) Adjust R502 (H.H. HIGH) until horizontal move-
ment stops.
3. High Voltage Adjustment
(See E-5 of Page 31)
a) Apply a VGA signal with crosshatch pattern.
b) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise.
c) Apply 220V AC to the unit.
d) To measure the high voltage, use a high impedance
high voitmeter, connect (—) to chassis and (+) to the
CRT anode contact.
e) Adjust R577 {(H.V. ADJ.) to set the high voltmeter
to245kV40.2kvV.
After adjusting R577 (H.V. ADJUST), cover
the control VR with UL tube and fill with
silicon rubber so the VR is not turned.
Warning:
ba
1
fy

4. Sub Contrast Adjustment
(See A-3 of Page 31)
a) Apply 220V AC to the unit.
b) Apply a VGA signal with white pattern to the unit.
c) Fully turn screen control of FBT counterclockwise.
d) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise.
e) Connect a oscilloscope between TP47G and ground.
f) Adjust R3124 (SUB.CONT.) to set the oscilloscope
42V + 1.0Vp-p.
. Video Bias Adjustment
(See D-1 of Page 31)
a) Apply 220V AC to the unit.
b) Apply a VGA signal with black pattern to the unit.
c) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise.
d) Turn R3511 (G. CUT OFF) to center position.
e) Connect a digital voltmeter between TP47G and
ground.
f) Adjust R3580 (VIDEO BIAS) to set the voltmeter
at 70V.
. White Balance Adjustment
(See D-1, C-3, E-1, E-2 of Page 31)
a) After adjusting VIDEO BIAS, adjust Bright control
(R3116) to set the voltmeter 75V + 1V.
b) Connect GND and TP401 with short wire.
c) Slowly turn the screen control clockwise until a dim
green horizontal line appears on the picture tube.
d} Make the horizontal line white by turning R3510
(R-CUT OFF) and R3512 (B-CUT OFF).
e) Remove the short wire connected at step (b).
f) Apply a full white field signal to the unit.
g) Turn Bright control (R3116) and Contrast control
(R3115) fully clockwise.
h) Adjust R3501 (R-DRIVE) and R3503 (B-DRIVE)
to produce a normal white pattern.
i) Check that the uniform white pattern is achieved
from low brightness to high brightness levels. Proper
tracking at all brightness levels can be obtained when
the screen control, cutoff controls and drive controls
are properly adjusted. If the results are unsatisfactory,
repeat all the above steps.
X = 0.284 (+ 0.01 at 25 ft-L, + 0.01 at 3 ft-L)
Y = 0.294 (+ 0.01 at 25 ft-L, + 0.01 at 3 ft-L)
25ft-L = 85.6 nit (cd/m?)
3ft-L = 10.3 nit (cd/m?)
7.
eta ee
Convergence Adjustment a
Note:
Before
adjusting
convergence,
the
vertical
size,
linearity
and
focus
adjustments
must
be
com-
pleted.
a)
Apply
a
VGA
signal
with
crosshatch
pattern
to
the
unit,
b) The brightness level should be no higher than
necessary to obtain a clear pattern.
c) Loosen the convergence magnet lock ring and con-
verge the red and blue lines at the center of the screen,
by rotating the R-B Static Convergence Magnet.
(See figure 28)
d) Align the converged red/biue lines with the green
lines at the center of the screen by rotating the
(See figure 28)
Tighten the convergence magnet lock ring.
(RB)-G Static Convergence Magnet.
e
f) Remove the DY wedges (see figure 29) and slightly
tilt (do not rotate) the deflection yoke horizontally
and vertically to obtain good overall convergence.
g) Secure the deflection yoke by reinserting the wedges.
(See figure 29).
h) If purity error is found, repeat the purity adjustments.
R-B Static Convergence
Magnet
Lock Ring
(Turn counterclockwise
to unlock Convergence
& Purity Magnet.)
& Purity Magnet
Purity Magnet
Figure 28
Magnet
Figure 29
(RB)-G Static Convergence
Clamp for Convergence
f,

8. Color Purity Adjustment *K
{See figure 28 and 30) |
a) Operate the display for 20 minutes, with the Bright |
control at max position to warm up the CRT.
b} Degauss the display fully by using an external de-
gaussing coil.
c) Roughly adjust convergence.
d) Apply a VGA signal with white pattern to the unit.
e) Turn red and blue Cut Off controls fully counter-
clockwise to obtain a green field.
Adjust Drive controls if green field is not obtained.
f) Loosen the deflection yoke clamp screw and move
the deflection yoke as close to the purity magnet as
possible.
g) Loosen the purity magnet lock ring (see figure 28)
and adjust the purity magnet to set the vertical green
raster precisely at the center of the screen. (See
figure 30) Then tighten the lock ring.
h) Slowly move the deflection yoke forward and adjust
for the best overall green screen.
i) Tighten the deflection yoke clamp screw.
j) Produce the blue and red raster by Cut Off controls
and observe that good purity is obtained on the
respective field.
k) Observe that a uniform white raster is obtained by
adjusting R, B Cut Off controls. !f screen is not
uniformly white, repeat above procedure,
Note: Purity correction magnet may be effective to
control purity slightly.
"7, Convergence Adjustment’ and ‘8. Color Purity
Adjustment’”’ are not necessary when the CRT is
replaced as ITC.
ML
Green Raster
Figure 30 Figure 31
Horizontal Line
— 18 —
9. Raster Brightness Adjustment
(See A-2 and B-2 of Page 31}
a) Apply a VGA signal with full black pattern.
b) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise.
c) Adjust the screen control of FBT so that the Back
Raster is no longer visible when viewed from a
distance of 30 cm.
10. Brightness Adjustment
(See A-3 of Page 31)
a) Apply a VGA signal with full white pattern.
b) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise.
c) Adjust R3126 (SUB BRIGHT) to 31 ft-L brightness.
31ft-L = 106.2 nit (cd/m?)
CAUTION: Too high R3126 (SUB BRIGHT) setting
can result in lower CRT life.
11. Focus Adjustment
a) Apply a VGA signal with crosshatch pattern.
b) Focus red, green, blue and white pictures to the
sharpest on the whole screen with focus control of
FBT.
12. Pincushion Adjustment
(See D-4 of Page 31)
a) Apply a VGA signal with crosshatch pattern to the
unit.
b} Adjust R456 (PINCUSHION) to set pincushion
error is within + 0.02 in. (0.05 mm).
13. V-Linearity Adjustment
(See C-2 of Page 31)
a) Apply a VGA signal with crosshatch pattern to the
unit.
b) Adjust R416 (V. LIN.) to equal the length of A
and B.
Figure 32
f,

14.
15.
16.
V-Center Adjustment
(See B-2 of Page 31)
a) Turn R444 (V. CENT.) to center position.
b) Apply a VGA signal with full white pattern to
the unit. And turn R3116 (BRIGHT) and R3115
(CONTRAST) controls fully clockwise.
c) Adjust R4060 (V. CENT. PRE.) to set the vertical
image position to center.
V-Size Adjustment
(See B-3 of Page 31)
a) Apply a VGA signal to the unit.
b) Turn R445 (V. SIZE) control to set click position.
c) Turn R3116 (BRIGHT) fully clockwise.
d) Adjust R408 (SUB. V. SIZE) to set the vertical width
of the image is 7.2 in. (183 mm).
Raster Center Adjustment
(See E-5 of Page 31)
ATTENTION: This adjustment is not necessary for
ordinary servicing.
Do this adjustment, when you find
that the Raster center position is not
in normal position,
a) Apply a VGA signal with full black pattern to the
unit,
b) Turn R3116 (BRIGHT) fully clockwise.
c) Adjust using optional couplers to set the Raster
center position.
CRT
Figure 33
e A-— B= —047 in. ~ — 0.31 in.
(—12mm ~ —8mm)
use coupler PAXAJT6C1391
e A -— B= —0.31 in. ~ — 0.2 in.
(-_8mm ~—5mm)
use coupler PAXAJT7C1391
17.
18.
— 19 —
C1381
e A-— B= —-0.2in. ~—0.08 in.
(~5 mm ~ — 2mm)
use coupler PAXAJT8C1391
e A — B = — 0.08 in. ~ + 0.08 in.
(-_2 mm ~ + 2mm)
no use
e A — B = +0.08 in. ~ + 0.16 in.
(+2mm~+4mm)
use coupler PAXAJT9C1391
H-Center Adjustment
(See B-2 of Page 31)
a) Apply a VGA signal with full white pattern.
b) Turn R3116 (BRIGHT) and R3115 (CONTRAST)
controls fully clockwise,
c) Turn R447 (H. CENT.} to click position.
d) Adjust R5015 (H. CENT. PRE.) to set the horizontal
image position to center.
H- Size Adjustment
(See B-2 of Page 31)
a) Apply a VGA signal with full white pattern.
b) Turn R514 (H. SIZE) control to set click position.
c) Adjust R512 (H. SIZE PRE) to set the horizontal
width of the image is 9.65 in. (245 mm),

C1381
COMPONENT
REFERENCE
GUIDE
Ic5002
(PAAH0003)
7
:
an
Pin
Name
EG
Pin
Name
i
ae
Pin
Name
|
Signal
/
Deflection
Process
IC
Fa
ee
FF
|
ayes
se
leat
2
|
cs5007
19
|
fHHIGH
|
36
|
C565
3
|
H.SIZE
a2
|
C455
37
|
H.GND
“|
a
C5006
21
|
svO
38
|
C558
5
|
DH31
|
22
C453
CO
|
39
AFC
PULSE
K
_|_c5004
i
“a
CLAMP
[
40
|
12v
@
4
7
|
DMOUT
24
|
C453
B
[41
|
XRAY
|
8
peceeee
|
25
|
SYNC
GND
Lae
Vv.
CENT.
9
|
R456
26
pecees
43
|
H.
DRIVE
OUT
10
[
XTL2
27.
|
V.SYNC
44
|
V.SIZE
[11
r
R519
28
|
ce56@
[45
[
TP401
|
12
[tu
29
|
_H.SYNC
:
46
|
H.CENT.
13.
|
OMNF
|
30
|
C552
47
|
xsvo
14
ied
{3
Vv.
GND
[as
|
tP501
15
|
Cc456Q@
|
32
|
C553
|
49
|
c409
@
|
16
|
cas6®
33
|
+12vV
%)
50
|
+12V
(H.
SIZE)
17.
|
fH
LOW
|
34
|
C554
Block Diagram
X-roy
Protector
V.Free Running
Signal
Generator
Separote
Sync
Soren
Composite Sync
Detector
H.Size
=
|
Control
|
|
Pincushion
Corrector
Control
ale
a
nN
AZOO MN-H- 5X
(mN-—w-Z) <
290 =