CTX EX-710F User manual

EX-710F
SERVICE MANUAL
The Monitor Specialists
EDITION 1
JAN. 2001
CTX

Copyright  2001 by Chuntex Electronic Co., Ltd.
The CTX SERVICE ANUAL is published by Chuntex Electronic Co., Ltd.
All rights reserved. No part of this manual may be used, copied, reproduced, or transmitted in any form
or by any means for any purpose without the express written permission of the publisher.
The publisher has been trying its best to make this publication perfect, and in this manner takes no
responsibility for the use of any of the materials or methods described in this manual, or for the
products thereof. Neither will the publisher be responsible for any damages caused by misuse or
misquotation.
Information in this manual is subject to change by the publisher without any notice in advance.
CTX is a registered trademark of Chuntex Electronic Co., Ltd.
4
8

CONTENTS
1.0 IMPORTANT NOTICE & INTROD CTION & SAFETY NOTICE.........................................................................1
I PORTANT NOTICE.................................................................................................................................................................. 1
INTRODUCTION.......................................................................................................................................................................... 1
SAFETY PRECAUTIONS............................................................................................................................................................. 1
CHECK OF HIGH VOLTAGE HOLD DOWN CIRCUIT............................................................................................................. 2
PRODUCT SAFETY NOTICE...................................................................................................................................................... 2
TECHNICIAN NOTICE................................................................................................................................................................. 2
2.0 GENERAL MAINTENANCE PROCED RE................................................................................................................4
3.0 F NCTION BLOCK DIAGRAM....................................................................................................................................5
4.0 DESCRIPTION OF CIRC IT.........................................................................................................................................6
1.0TIMING MODE (CTX PRESETTING TIMING).......................................................................................................... 7
6.0 ADJ STMENT..................................................................................................................................................................9
6.1 CFA1797B ADJUST ENT............................................................................................................................................9
7.0 TRO BLESHOOTING.................................................................................................................................................. 12
7.1 AIN TROUBLESHOOTING ROUTINE.................................................................................................................. 12
7.2 POWER SUPPLY CIRCUIT TROUBLESHOOTING ROUTINE.............................................................................. 13
7.3 ICON CIRCUIT TROUBLESHOOTING ROUTINE...............................................................................................15
7.4 VIDEO CIRCUIT TROUBLESHOOTING ROUTINE............................................................................................... 18
7.5 DEFLECTION CIRCUIT TROUBLESHOOTING ROUTINE................................................................................... 21
7.5.1 Horizontal Deflection Circuit.................................................................................................................................21
No Raster...................................................................................................................................................................................... 21
H-Asynchronous........................................................................................................................................................................... 22
No Horizontal Scan...................................................................................................................................................................... 23
...................................................................................................................................................................................................... 23
Linearity....................................................................................................................................................................................... 24
Out of phase.................................................................................................................................................................................. 25
Width Abnormal........................................................................................................................................................................... 25
7.5.2 Vertical Deflection Circuit..................................................................................................................................... 26
No vertical scan............................................................................................................................................................................ 26
Picture distortion.......................................................................................................................................................................... 27
V-Asynchronous........................................................................................................................................................................... 28
Vertical position & Size................................................................................................................................................................ 28
7.5.3 Other.......................................................................................................................................................................29
Poor focus..................................................................................................................................................................................... 29
8.0 IC CONFIG RATION................................................................................................................................................... 33
9.0 PARTS LIST.................................................................................................................................................................... 35
10.0 LAYO T FOR MAIN COMPONENTS AND ADJ STED..................................................................................... 43
11.0 CIRC IT DIAGRAM................................................................................................................................................... 43
12.0 EXPLODED VIEW....................................................................................................................................................... 43
4
4
8
12
16
20
24
28
32
36
40

CFA1797B 1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE
1.0 IMPORTANT NOTICE &
INTRODUCTION & SAFETY
NOTICE
IMPORTANT NOTICE
Please read before attempting service
1. W ile t e monitor is in operation, do not attempt
to connect or disconnect any wires.
2. Make sure t e power cord is disconnected
before replacing any parts in t e monitor.
3. W en t e power is on, do not attempt to s ort
any portion of t e circuit. T is s orting may
cause damage to t e components in t e monitor.
4. W en servicing t e H.V. area, be certain t at t e
C.R.T anode is safely disc arged before
removing t e anode cap.
5. Caution must exercised w en servicing t is
monitor.
INTRODUCTION
En anced repair capabilities
T is Service Manual is edited for model CFA1797B
w en service is necessary. t ere are four primary
parts included in t is troubles ooting guide w ic
offer t e easiest way to locate problem points and
repair t e mac ine to t e best possible condition.
1. T e Adjustment Section offers t e adjustable
met od, steps and all data of t e factory's initial
settings w ic can make t e mac ine get t e
best performance at t at time. By t e way,
before adjusting, t e mac ine must be warmed
up for at least 10 minutes and t e CRT face
must be in an east ward direction.
2. T e Troubles ooting Section as five main
parts including: power supply, micon circuit,
CRT, deflection & video circuit. Eac offers
fast repair routine and t e IC, transistor voltage
records against all specified signal modes.
T ese voltage readings are measured wit a
HP 34401A multimeter wit input impedance
10M (0.1V~1000V range) and waveforms
s own on circuit sc ematics
are measured by a Tektronix TDS 520 digital
oscilloscope, t e monitor receives VGA-480 full
w ite square pattern.
3. T e Spare parts list offers t e CTX part number
(P/N) w ic is used frequently by repairmen /
tec nicians. For details please refer to t e
service guide or service manual. If t ere is any
engineering c ange regarding t is model, CTX
will issue t e updated information by a non-
periodical Tec nical Bulletin.
4. T e transistor voltage records are measured
from LEFT side to RIGHT side w en face to t e
front (printed side) of transistor.
SAFETY PRECAUTIONS
NOTICE: Comply wit all cautions and safety
related notes located on or inside t e cabinet and on
t e c assis or picture tube.
T e following precautions s ould be observed.
1. Do not install, remove, or andle t e picture
tube in any manner unless s atterproof goggles
are worn. People not so equipped s ould be
kept away w ile picture tubes are andled.
Keep picture tube away from t e body w ile
andling.
2. W en replacing a c assis in t e monitor, all t e
protective devices must be put back in place,
suc as barriers, non-metallic knobs,
adjustment and compartment s ields, and
isolation resistor-capacitor, etc..
3. W en service is required, observe t e original
lead dress. Extra precaution s ould be taken to
assure correct lead dress in t e ig voltage
circuitry area.
4. Always use t e manufacturer’s replacement
components. Especially critical components as
indicated on t e Replacement parts list s ould
not be replaced by ot er manufacturer’s
Furt ermore w ere a s ort circuit as occurred,
replace t ose components t at indicate
evidence of over eating.
5. Before returning a serviced monitor to t e
customer, t e service tec nician must
t oroug ly test t e unit to be certain t at it is
completely safe to operate wit out danger of
electrical s ock, and be sure t at no protective
device built into t e monitor by t e manufacturer
as become defective, or inadvertently defeated
during servicing. T erefore, t e following
c ecks s ould be performed for continued
protection of t e customer and service
tec nician.
CTX 1
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80
84
88

1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE CFA1797B
High Voltage
T is monitor is provided wit a ig voltage old
down circuit for clearly indicating t at voltage
as increased in excess of a predetermined
value. Comply wit all notes described in t is
Service Manual regarding t is old down circuit
w en servicing, so t at t is old down circuit
may function correctly.
Ser ice Warning
Wit minimum Brig tness and Contrast t e
operation ig voltage in t is display is lower
t an 27KV.
If any component aving influence on t e ig
voltage is replaced, confirm t at t e ig
voltage wit minimum Brig tness and Contrast
is lower t an 27KV. To measure ig voltage
use a ig impedance ig -voltage meter.
(SENSITIVE RESEARCH Model: ESH or
Equivalent) Connect (-) to c assis eart and (+)
to t e CRT anode button. (See t e following
connection diagram Fig. 1).
NOTE:
1) Turn power switc off wit out fail before making
t e connection to t e Anode button.
2) Before turn power switc ON, confirm t e AC
line voltage, set t e “Voltage Selector”.
Fig. 1
X-radiation
TUBE: T e primary source of X-radiation in t is
monitor is t e picture tube. T e tube utilized in
t is c assis is specially constructed to limit X-
radiation emissions. For continued X-radiation
protection, t e replacement tube must be t e
same type as t e original, manufacturer
approved type. W en troubles ooting and
making test measurements in a monitor wit a
problem of excessive ig voltage, avoid being
unnecessarily close to t e picture tube and t e
ig voltage components. Do not operate t e
c assis longer t an is necessary to locate t e
cause of excessive voltage.
CHECK OF HIGH VOLTAGE HOLD
DOWN CIRCUIT
C ecking of t e ig voltage old down circuit
operation.
1. Turn t e switc of t e unit ON.
2. Set Brig tness, Contrast controls to max..
3. S ort t e two pins of P402 as s own in Fig. 2.
T e picture s ould disappear immediately.
D a te :
F e b ru a ry 1 4 , 1 9 9 8
S e e t
o f
S iz e
D oc u m e nt N u m be r
R E V
A
P402
Main Board Assembly
Fig. 2
4. Turn t e switc of t e unit OFF.
PRODUCT SAFETY NOTICE
Many electrical and mec anical parts in t e color
monitor units ave special safety related
c aracteristics.
T ese are often not evident from visual inspection
nor can t e protection afforded by t em necessarily
be obtained by using replacement components rated
for ig er voltage, wattage, etc.. Replacement parts
w ic ave t ese special safety c aracteristics are
identified in t is Service Manual.
Electrical components aving suc features are
identified by marking wit “!” on t e parts list in t is
Service Manual.
T e use of a substitute replacement component
w ic does not ave t e same safety c aracteristics
as t e manufacturer recommended replacement
one, s own in t e parts list in t is Service Manual,
may create s ock, fire, X-radiation, or ot er
azards.
TECHNICIAN NOTICE
Please read before you attempt to repairing or
measure component, please use t e way to get best
safety.
1. Pull t e AC plug directly. W en power
2 CTX
+
-
CRT ANODE
CHASSIS
GROUND
HIGH IMPEDANCE
H.V. METER
SENSITIVE RESEARCH
Model:ESH or equivalent.
CRT
8
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80

CFA1797B 1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE
switc is still on, approximately 5 sec t e
energy of C104 could be disc arged
quickly.
2. If you turn off power switc first, t en you
pull t e AC plug t e energy of C104 will be
disc arged very slowly; about 1sec
disc arge 1 volt. It needs 5 minutes to
disc arge.
CTX 3
4
8
12

2.0 GENERAL MAINTENANCE PROCEDURE CFA1797B
2.0 GENERAL MAINTENANCE PROCEDURE
START
CHECK AND RECORD THE
FAILURE MODE OF
CUSTOMER
VISUAL CHECK THE
APPEARANCE OF CABINET/
CRT
CHECK PICTURE
PERFORMANCE
BURN IN 24 HOURS
RE-CHECK PICTURE
PERFORMANCE
RECORD
REPLACEMENT
REPAIR & ADJUSTMENT
NG
OK
NG
OK
OK
OK
NG
4 CTX16

CFA1797B 3.0 FUNCTION BLOCK DIAGRAM
3.0 FUNCTION BLOCK DIAGRAM
CTX 5
+210V
+80V
+15.5V
+7V
+12V
-16V
MICRO PROCESSOR
& EEPROM
IC501,502
VERTICAL
DEFLECTION
IC201
V-CENTER
V-SIZE CS CONTROL
Q315-Q322
C358,C359,C361
C362
HORIZONTALO/P
Q309,D309
L301,T302,T304
DYNAMIC
FOCUS
Q415,T305
HORIZONTAL
DRIVER
Q310,T303,D312
R350,R373,R383
OSD
GENERATOR
IC603
VIDEO
PRE-AMP
IC601
(M52743)
VIDEO
AMP
IC604
(LM2435T)
R-BIAS
G-BIAS
B-BIAS
DC TO DC
Q307,Q308
Q311,D313
HOR./VERT.OSC
& GEOMETRY
CONTROL
IC301
B+
H-PULSE
SDA
SCL
HV REGULATOR
IC401,Q407
Q409,Q421
VR402
HV OUTPUT
FBT,D401
Q401,Q402
C404
R/I
G/I
B/I
H-SYNC
V-SYNC
CLK
DATA
V+
H+
HOR.YORK
VERT.YORK
CLAMP
ABL
B,G,R BIAS
RK
BK
GK
G1
G2(SCREEN)
HIGH-VOLTAGE
G3(FOCUS)
+7V
POWER
SUPPLY
POWER
SAVING
RB
F-BLK
G
AC INPUT
H-SIZE
GEOMETRY
H-PHASE
CRT
G1 CIRCUIT
Q411,Q412
Q414
S0-S3

4.0 DESCRIPTION OF CIRCUIT CFA1797B
4.0 DESCRIPTION OF CIRCUIT
1. Power supply circuit
T e AC voltage input connected to EMI circuit
and rectifier circuit. R102, R112 and Switc
(SW101) will provide DC voltage to IC101,
w en switc on. W ile IC101 works normal,
T e IC101 will Auto-detect output voltage of
power supply from Pin2 and correct t e duty
cycle of Pin6 output pulse to compensate t e
variation of output voltage.
T e output of IC101 Pin6 connected to power
MOSEFET to drive t e power transformer
T101. W en power MOSFET is on, t e energy
stored in t e primary winding of T101. Once
MOSEFET is off, t e energy transfer to t e
secondary and c arges t e output capacitor to
get t e stable DC voltage.
2. Oscillation circuit
T e functions H-size, H-p ase, V-size, V-
center, Side-pin, Parallel….are designed inside
into IC301. T e Pin25 is X-RAY protect input.
W en H.V output circuit is abnormal (H.V too
ig ) t e X-RAY protect circuit will s ut off t e
orizontal output, H.V. also will be s ut down.
T e Pin28 is B+ control driver output. T e
Pin26 is orizontal square wave output drives
orizontal output. T e Pin24 is parabolic
output. T e Pin23 is vertical output. T e Pin1
& pin2 are H-SYNC & V-SYNC input. T e Pin3
is vertical blanking output. T e Pin 20, 22 for
vertical oscillator. T e Pin 6, 8 for orizontal
oscillator.
3. Vertical output circuit
T e Pin23 of IC301 is vertical sync output
connected to IC201 (Amplifier), Pin5 of IC201
is vertical amplifier output drives t e vertical
deflection directly.
4. Horizontal output circuit
T e DC-DC is to generate a DC voltage (B+)
for orizontal output circuit. T e CPU (IC501)
controls t e H. size adjustment function of
IC301 via t e I2C Bus. T e output of IC301
(Pin6) connected to gate of Q311 to make t e
Q311 switc ing. W en Q311 is ON, t e
energy stored in T304 and t e energy released
via D313 w en Q311 turned OFF. T e B+
applied to Horizontal Yoke and supply t e
power for orizontal deflection. T e more t e
B+ will get t e bigger t e orizontal size.
5. Micon circuit
T e IC501 (CPU) will detect polarity and
frequency of input H.V. Sync. T e CPU will
determine t e mode of input timing (preset or
users mode) and load mode data from IC502
(EEPROM). T e outputs of IC501 were
connected to ot er function circuit (IE. H-size,
H-p ase, V-size, and V-center…). Also, t e
user can adjust picture from keyboard and t e
data will be saved into IC502 automatically.
For t e O.S.D. mode, w en O.S.D. manual is
active CPU will inform t e O.S.D IC (IC603) to
send O.S.D BLK signal to blank t e video
signal from VGA card, and t e O.S.D. IC will
send O.S.D. R.G.B. Video signal to s ow t e
O.S.D. manual on screen.
6. H.V. regulation circuit
T e IC401 is a P.W.M IC; Pin6 is P.W.M
output, w ic connected to Q407, Q409. T e
Q402 is H.V. output switc ing transistor. Q401
and D401 are damper device provide t e pat
of damper current. Q421 is a feedback voltage
from FBT Pin13 connected to PIN2 (IC401)
and correct t e duty cycle of PIN6 output pulse.
7. Video output circuit
Video circuit consists of video preamplifier
IC601 and output cascade amplifier IC604.
IC601 is a video processing IC equipped wit
t ree DC amplifiers to pre-amplify R.G.B.
signals from 0.7V to 4.2V.
T e R.G.B. GAIN & BIAS control signal are
from IC501 via I2C-bus to DAC IC601. T e
IC601 control to video gain. T e output of pin
24, 25, 26 are connected to BIAS circuit of
eac R.G.B. signal’s amplification and t us
ac ieve a well balance able w ite picture.
T e O.S.D. R.G.B. (Pin4, 9,13 of IC601) is t e
input of O.S.D. Video signal. T e IC604 is
R.G.B. drive to capable of driving CRT.
6 CTX
20
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80
84
88

CFA1797B 5.0 TIMING MODE CTX presetting Timing)
1.0 TIMING MODE (CTX presetting Timing)
NAME 720X400-70 640X480-60 800X600-75 800x600-85 MAC II-832
PIXEL CLOCK 28.322 MHz 25.175 MHz 49.500 MHz 56.250 MHz 57.284MKz
F 31.469 kHz 31.469 kHz 46.875 kHz 53.674 kHz 49.726MKz
Fv 70.087 HZ 59.941 HZ 75.000 HZ 85.062 HZ 74.552Hz
INTERLACE MODE NO NO NO NO NO
VIDEO ANALOG-COLOR ANALOG COLOR ANALOG COLOR ANALOG COLOR ANALOG COLOR
XS SYNC ON
GREEN
NO NO NO NO NO
VIDEO LEVEL 700mv 700mv 700mv 700mv 700mv
WHITE LEVEL 700mv 700mv 700mv 700mv 700mv
BLANK LEVEL 0 IRE 0 IRE 0 IRE 0 IRE 0 IRE
16 BIT HEX DATA 0000 0000 0000 0000 0000
UNIT OF DATA PIXEL us/ms PIXEL us/ms PIXEL us/ms PIXEL us/ms PIXEL us/ms
H TOTAL 900 31.777us 800 31.778us 1056 21.333us 1048 18.631us 1152 20.110us
H DISPLAY 720 25.422us 640 25.422us 800 16.162us 800 14.222us 832 14.524us
H B-PORCH 54 1.907 us 48 1.907 us 160 3.232 us 152 2.702 us 224 3.910us
H-S-WIDTH 108 3.813 us 96 3.813 us 80 1.610 us 64 1.138 us 64 1.117us
H BORDER 0 0.000 us 0 0.000 us 0 0.000 us 0 0.000 us 0 0.000us
H SIZE 4.000mm 4.000mm 4.000mm 4.000mm 4.000mm
V TOTAL 449 14.268ms 525 16.683ms 625 13.333ms 631 11.756ms 667 13.413ms
V DISPLAY 400 12.711ms 480 15.253ms 600 12.800ms 600 11.179ms 624 12.549ms
V B-PORCH 35 1.112 ms 33 1.049 ms 21 0.448 ms 27 0.503 ms 39 0.784ms
V S WIDTH 2 0.064 ms 2 0.064 ms 3 0.064 ms 3 0.056 ms 3 0.060ms
V BORDER 0 0.000 ms 0 0.000 ms 0 0.000 ms 0 0.000 ms 0 0.000ms
V SIZE 3.000mm 3.000mm 3.000mm 3.000mm 3.000mm
H S OUTPUT ON(-) ON(-) ON(+) ON(+) Off-Low
V S OUTPUT ON(+) ON(-) ON(+) ON(+) Off-Low
X S OUTPUT ON(-) ON(-) ON(+) ON(+) ON(-)
X S SELECT H H H H H+V
CTX 7
24

5.0 TIMING MODE CTX presetting Timing) CFA1797B
NAME 1024x768-75 1024X768-85 1152X864-75 1280X1024-75 1280X1024-85
PIXEL CLOCK 78.751MHZ 94.500MHZ 108.000MHZ 135.000MHZ 157.500MHZ
F 60.024KHZ 68.677KHZ 67.500KHZ 79.976KHZ 91.146KHZ
Fv 75.030HZ 84.996HZ 75.000HZ 75.024HZ 85.240HZ
INTERLACE MODE NO NO NO NO NO
VIDEO ANALOG-COLOR ANALOG COLOR ANALOG-COLOR ANALOG COLOR ANALOG-COLOR
XS SYNC ON
GREEN
NO NO NO NO NO
VIDEO LEVEL 700mv 700mv 700mv 700mv 700mv
WHITE LEVEL 700mv 700mv 700mv 700mv 700mv
BLANK LEVEL 0 IRE 0 IRE 0 IRE 0 IRE O IRE
16 BIT HEX DATA 0000 0000 0000 0000 0000
UNIT OF DATA PIXEL us/ms PIXEL us/ms PIXEL us/ms PIXEL us/ms PIXEL us/ms
H TOTAL 1312 16.660us 1376 14.561us 1600 14.815us 1688 12.504us 1728 10.971us
H DISPLAY 1024 13.003us 1024 10.836us 1152 10.667us 1280 9.481us 1280 8.127us
H B-PORCH 176 2.235us 208 2.201 us 256 2.370 us 248 1.837 us 224 1.422 us
H-S-WIDTH 96 1.219us 96 1.016 us 128 1.185 us 144 1.067 us 160 1.016 us
H BORDER 0 0.000us 0 0.000 us 0 0.000 us 0 0.000 us 0 0.000 us
H SIZE 4.000mm 4.000 mm 4.000 mm 4.000 mm 4.000 mm
V TOTAL 800 13.328ms 808 11.765ms 900 13.333ms 1066 13.329ms 1072 11.761ms
V DISPLAY 768 12.795ms 768 11.183ms 864 12.800ms 1024 12.804ms 1024 11.235ms
V B-PORCH 28 0.466ms 36 0.524 ms 32 0.474ms 38 0.475ms 44 0.483ms
V S WIDTH 3 0.050ms 3 0.044 ms 3 0.044ms 3 0.038ms 3 0.033ms
V BORDER 0 0.000 ms 0 0.000 ms 0 0.000 ms 0 0.000 ms 0 0.000 ms
V SIZE 3.000 mm 3.000 mm 3.000 mm 3.000 mm 3.000 mm
H S OUTPUT ON(+) ON(+) ON(+) ON(+) ON(+)
V S OUTPUT ON(+) ON(+) ON(+) ON(+) ON(+)
X S OUTPUT ON(+) ON(+) ON(+) ON(+) ON(+)
X S SELECT H H H+V H H
8 CTX28

CFA1797B 6.0 ADJUSTMENT
6.0 ADJUSTMENT
6.1 CFA1797B ADJUSTMENT
REM: PRESET MODE DATA ADJUSTMENT:
A. Turn off it.
B. Press t e ▼ and ▲ at same time w ic on t e external control panel.
C. Turn on it.
Remark: Before adjusting, monitor must warm up 20 minutes and CRT must be degaussed.
ADJUSTMENT LOCATION SPECIFICATION/DESCRIPTION TIMING & PATTERN
210V VR101 D117”“=210V0.2V VGA-480, X’HATCH
12V VR102 J82=12V0.2V VGA-480, X’HATCH
H.V. VR402 CRT ANODE=27.0KV0.2KV VGA-480, X’HATCH
FREQUENCY VR103 D112"+"=270.1KHz VGA-480, X’HATCH
V-LINE OSD. MANUAL Ymax-Ymin
Ymax+Ymin
VGA-480, X’HATCH
V-SIZE OSD. MANUAL V-SIZE=232mm5 mm All of PRESET
modes, X’HATCH
H-CENTER VR302 Set Raster at center.IR-LI  2 mm 1024X768 (80.4KHZ)
X’HATCH
H-WIDTH OSD. MANUAL H-WIDTH=310mm5mm All of PRESET
modes, X’HATCH
H-PHASE OSD. MANUAL R-L
2
All of PRESET
modes, X’HATCH
V-CENTER OSD. MANUAL U-D
2
All of PRESET
modes, X’HATCH
CORNER OSD. CORNER MANUAL  0.5mm All of PRESET
modes, X’HATCH
OSD. SIDE-PIN MANUAL  2.0mm All of PRESET
modes, X’HATCH
OSD. BALANCE MANUAL  1.0mm All of PRESET
modes, X’HATCH
OSD. MANUAL  2.0mm All of PRESET
modes, X’HATCH
OSD. MANUAL  2.5mm All of PRESET
modes, X’HATCH
OSD. MANUAL  2mm All of PRESET
modes, X’HATCH
SCREEN FBT SCREEN VR T e “1” row of color bar pattern is
visible w en Brig tness is
DAC50.
VGA-480 COLOR
BAR
FOCUS FBT FOCUS VR Optimum point 1024X768 68.6KHZ
”m”
WHITE BALANCE OSD. CONTRAST MAX (DAC=100) VGA-480, MOSAIC
PRE ADJ OSD. BRIGHTNESS CLICK POINT (DAC=100) VGA-480, MOSAIC
FBT SCREEN VR RASTER Y1.0FL VGA-480, MOSAIC
OSD. R.G.B BIAS RASTER x=28110, y=31110 VGA-480, MOSAIC
OSD. CONTRAST MAX (DAC = 100) VGA-480, MOSAIC
OSD. BRIGHTNESS CLICK POINT (DAC = 50) VGA-480, MOSAIC
OSD. SUBCONT MOSAIC Y405FL VGA-480, MOSAIC
OSD R.G.B.GAIN MOSAIC x=28110,y = 31110 VGA-480, MOSAIC
CTX 9
 5%
 3mm
 3mm
4
8

6.0 ADJUSTMENT CFA1797B
ADJUSTMENT LOCATION SPECIFICATION/DESCRIPTION TIMING & PATTERN
WHITE BALANCE
ADJ
OSD. R.G.B GAIN MODE1(9300OK):x=28310
:y=29710
VGA-480, FULL
WHITE
MODE2(6500OK):x=31310
:y=32910
MODE3(5000OK):x=34610
:y=35910
OSD. R.G.B BIAS MODE1(9300OK):x=28310
:y=29710
W en contrast is in Y  13FL.
BRIGHTNESS OSD. CONTRAST MAX (DAC=100) VGA-480, COLOR BAR
SETTING OSD. BRIGHTNESS CLICK POINT (DAC=50) VGA-480, COLOR BAR
FBT SCREEN VR T e “2” row of color bar pattern is
just visible.
VGA-480, COLOR BAR
Brig tness R+B B+G R+G
15
BRIGHT
BLUE
BRIGHT
RED
BRIGHT
PRUPLE GREEN
BLUE +
GREEN
RED +
YELLOW WHITE 7
14 6
13 5
reduce 12 4
11 3
10 2 Visible
9 1 visible obscurely
8 0
CONVERGENCE Adjustment location 4-Ploe Magnet 1280X1024-75
H-80KHz. X’HATCH
Adjustment location 6-Pole Magnet 1280X1024-75
H-80KHz. X’HATCH
Adjustment location XCV 1280X1024-75
H-80KHz. X’HATCH
Adjustment location XBV 1280X1024-75
H-80KHz. X’HATCH
10 CTX
32

CFA1797B 6.0 ADJUSTMENT
ADJUSTMENT LOCATION SPECIFICATION/DESCRIPTION TIMING & PATTERN
CONVERGENCE Adjustment location TLV 1280X1024-75
H-80KHz. X’HATCH
Adjustment location YCH 1280X1024-75
H-80KHz. X’HATCH
Adjustment location YBH 1280X1024-75
H-80KHz. X’HATCH
CTX 11
36

7.0TROUBLESHOOTING CFA1797B
7.0 TROUBLESHOOTING
7.1 MAIN TROUBLESHOOTING ROUTINE
POWER SUPPLY CKT.
TROUBLESHOOTING
ROUTINE
CHECK 210V,80V,15.5V,
7V,5V,-16V,+12V
START
CHECK POWER INDICATOR
LED
DOES IMAGE APPEAR
DOES RASTER APPEAR ?
POWER SUPPLY CKT.
TROUBLESHOOTING
ROUTINE & ADJUSTMENT
NG
OK
NG
NG
OK
POWER SAVING CKT.
TROUBLESHOOTING
ROUTINE
LED COLOR ?
AMBER
GREEN
DEFLECTION CKT.
TROUBLESHOOTING
ROUTINE & ADJUSTMENT
NG
CHECK COLOR
PERFORMANCE
CHECK GEOMETRIC
PERFORMANCE
VIDEO CKT.
TROUBLESHOOTING
ROUTINE
NG
OK
DEFLECTION CKT.
TROUBLESHOOTING
ROUTINE
NG
OK
CHECK EXT. SW FUNCTION
OK
OK
OK
NO TROUBLE FOUND
END
MICON CKT.
TROUBLESHOOTING
ROUTINE
NG
OK
12 CTX
4
40

CFA1797B 7.0TROUBLESHOOTING
7.2 POWER SUPPLY CIRCUIT TROUBLESHOOTING ROUTINE
CHECK AC COMPONENTS
NTC101,L102,L103,C104,
F101,BD101,L104,D102.
START
CHECK DC VOLTAGE OF
C104 (+/-) PINS
NG
CHECK VOLTAGE OF IC101
PIN 7
CHECK R102,R112
SW101
NG
CHECK RL102,Q113,
Q114
CHECK AC OUTPUT OF
T101 2ND WINDING
NG
CHECK D108,D110,D112,
D106,D117,D109
OK
OK
OK
NG
CHECK GATE VOLTAGE OF
Q104 AND R126
CHECK Q116,Q117,IC103
IC104,ZD103
OK
CTX 13

7.0TROUBLESHOOTING CFA1797B
TEST CONDITIONS: TIMING: 640X480-60Hz (31K)
PATTERN: CROSS HATCH
Unit: Volt
IC IC101 (3842) Q104(FS10SM-16A) IC103(PS2561)
PIN
AC IN 12345678SDG3 4
110V 3.15 2.51 0.14 2.47 GND 6.21 16.69 5.02 0.14 152.51 5.92 0.95 16.68
220V 3.00 2.52 0.07 2.45 GND 63.02 76.63 5.01 0.07 317.16 2.76 1.39 16.62
IC IC102 (5002L) IC104 (TL431) IC501 (68P61A)
PIN
STATUS O G I A K R 21 22
NORMAL 5.02 GND 6.27 GND 4.31 2.48 4.96 0
SUSPEND 5.02 GND 6.95 GND 3.69 2.48 4.95 4.84
OFF 5.02 GND 6.71 GND 2.80 2.49 0.01 4.84
TR Q102 (C945) IC501(68P61A)
PIN
STATUS E C B 26
NORMAL GND 16.07 0.07 0.14
DEGUASS GND 0.21 0.76 3.48
TR/IC IC103(PS2561) Q107 (C2001) Q109 (C945) Q110 (2SB562)
PIN
STATUS 1 2 E C B E C B E C B
NORMAL 5.36 4.30 12.00 14.10 12.67 6.19 12.68 6.80 6.53 6.35 6.67
SUSPEND 4.76 3.66 0.34 0.70 0.68 0.35 0.71 0.18 6.98 6.78 6.10
OFF 3.91 2.79 0.43 0.64 0.64 0.44 0.65 0.25 6.98 0 6.98
TR Q111 (C945) Q113 (C945) Q114 (C945) Q116 (A733)
PIN
STATUS E C B E C B E C BE C B
NORMAL GND 0.14 0.72 GND 0.09 0.72 GND 0.72 0 6.53 2.48 6.50
SUSPEND GND 0.15 0.73 GND 6.92 0.01 GND 0 0.66 6.98 6.95 6.32
OFF GND 6.98 0 GND 6.71 0.01 GND 0 0.67 6.98 6.95 6.33
TR Q117 (C945)
PIN
STATUS E C B
NORMAL GND 6.49 0
SUSPEND GND 0.01 0.64
OFF GND 0.01 0.64
14 CTX
44
4
8

CFA1797B 7.0TROUBLESHOOTING
7.3 MICON CIRCUIT TROUBLESHOOTING ROUTINE
CHECK IC501,P501,
IC102,Q107,Q109,Q110,Q111
START
IS CPU IN POWER SAVING
MODE ?
YES
REPLACE IC501,IC502
CHECK MODE DATA CAN
BE SAVED ?
REFER TO "
DEFLECTION
& VIDEO CKT.
TROUBLESHOOTING ROUTINE
NO
CHECK IC501,IC601
CHECK EXTERNAL
CONTROL PANEL
FUNCTION
NG
END
YES
NO
OK
OK
CTX 15
48

7.0TROUBLESHOOTING CFA1797B
TEST CONDITIONS: AC LINE IN:110V/60Hz
PATTERN: CROSS HATCH
STATUS : NORMAL
Unit: Volt
IC IC501 (68P61A)
PIN
MODE 12345678910
640X480-60(31K) 0.98 0.55 0.96 5.00 5.02 GND 2.69 2.52 5.01 5.01
800X600-85(53K) 0.98 0.55 0.98 5.00 5.02 GND 2.68 2.51 5.01 5.01
1024X768-85(68K) 0.98 0.55 0.98 5.00 5.02 GND 2.69 2.52 5.01 5.01
1280X1024-85(91K) 0.98 0.55 0.98 5.00 5.02 GND 2.69 2.51 5.01 5.01
IC IC501 (68P61A)
PIN
MODE 11 12 13 14 15 16 17 18 19 20
640X480-60(31K) 0.07 5.01 5.01 5.01 5.01 0 0 0 0 0
800X600-85(53K) 0.07 5.01 5.02 5.01 5.01 0 4.98 0 4.98 0
1024X768-85(68K) 0.07 5.01 5.01 5.01 5.01 0 0 4.98 4.98 4.98
1280X1024-85(91K) 0.07 5.01 5.02 5.01 5.01 0 4.98 4.98 4.98 4.98
IC IC501 (68P61A)
PIN
MODE 21 22 23 24 25 26 27 28 29 30
640X480-60(31K) 4.96 0 5.01 0.91~5.02 5.02 0.14 2.44 0.08 0.27 5.02
800X600-85(53K) 4.96 0 5.01 0.94~5.02 5.02 0.13 2.45 0.09 1.25 5.02
1024X768-85(68K) 4.95 0 5.01 0.71~5.02 5.02 0.13 2.45 0.11 2.15 5.02
1280X1024-85(91K) 4.95 0 5.01 0.66~5.02 5.02 0.10 2.44 0.15 4.25 5.02
IC IC501 (68P61A)
PIN
MODE 31 32 33 34 35 36 37 38 39 40
640X480-60(31K) 5.02 0.02 0.59 0 0.03 0.06 0.08 0.03 4.05 4.73
800X600-85(53K) 5.02 0.02 0.30 0 0.02 0.04 0.02 0.02 0.30 0.21
1024X768-85(68K) 5.02 0.02 0.34 0 0.02 0.04 0.03 0.03 0.34 0.20
1280X1024-85(91K) 5.02 0.02 0.46 0 0.02 0.04 0.04 0.03 0.45 0.20
IC IC502 (AT24C04)
PIN
MODE 12345678
640X480-60(31K) 5.02 GND 5.02 GND 5.01 5.01 GND 5.02
800X600-85(53K) 5.02 GND 5.02 GND 5.01 5.01 GND 5.02
1024X768-85(68K) 5.02 GND 5.02 GND 5.01 5.01 GND 5.02
1280X1024-85(91K) 5.02 GND 5.02 GND 5.01 5.01 GND 5.02
16 CTX
4
8
52