Sharp SX68JS10 User manual

1
SX68JS10
WARNING
Thechassisinthisreceiverispartiallyhot.Useanisolationtransformerbetweenthelinecordplugandpower
receptacle,whenservicingthischassis.Topreventelectricshock,donotremovecover.Nouser– serviceable
parts inside. Refer servicing to qualified service personnel.
SERVICE MANUAL
COLOURTELEVISION
Chassis No. SP-91
S79L8SX68JS10
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
originalcondition and onlyparts identical tothose specified
be used.
MODEL
SERVICE MANUAL COLOUR TELEVISION MODEL SX68JS10
Page
FEATURES .................................................................................................................................................... 2
ELECTRICAL SPECIFICATIONS .................................................................................................................. 2
IMPOTANT SERVICE NOTES....................................................................................................................... 3
ADJUSTMENT PRECAUTION....................................................................................................................... 4
SERVICE ADJUSTMENT .............................................................................................................................. 8
TROUBLE SHOOTING TABLE.................................................................................................................... 17
SOLID STATE DEVICE BASE DIAGRAM ................................................................................................... 22
WAVEFORMS.............................................................................................................................................. 23
CHASSIS LAYOUT ...................................................................................................................................... 24
BLOCK DIAGRAM ....................................................................................................................................... 26
DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................... 30
SCHEMATIC DIAGRAM .............................................................................................................................. 31
PRINTED WIRING BOARD ASSEMBLIES.................................................................................................. 42
REPLACEMENT PARTS LIST..................................................................................................................... 51
CONTENTS
SX68JS10
SHARP CORPORATION
SX68JS10

SX68JS10
2
FEATURES
■PAL-B/G. and AV NTSC Receiving System.
■Component input Terminal(Rear).
■Twin Buss Reflex SP Box.
■Double Dynamic Picture Circuit.
■CATV Ready.
■PAL/NTSC Digital-Comb Filter.
■Sound Spatializer.
■Aperture Control Circuit.
■English/Chinese/Russian/French/Arabic/Malay 6 Language OSD.
■IGR-B/G.
■Super Flat Picture Tube.
■CTI SRT Circuit.
Power Input ..................................................................................................................... AC 220V, 50Hz
Power Consumption ....................................................................................................................... 190W
Convergence.................................................................................................. Self Convergence System
Focus ......................................................................................... Bi-Potential, Uni-Potential Electroslatic
Sweep Deflection ......................................................................................................................Magnetic
Intermediate Frequency
Picture IF Carrier.................................................................................................................. 38.9 MHz
Sound IF Carrier
5.5 MHz .............................................................................................................................. 33.4 MHz
Colour Sub-Carrier
PAL/NTSC ........................................................................................................................ 34.47 MHz
NTSC................................................................................................................................ 35.32 MHz
Audio Power Output Rating............................................................................. 20W x 2 total 40W (Max)
Speaker
Size ........................................................................................8 x 12 cm x 2pcs, 10cm Round x 2pcs.
Speaker Box Unit Impedance ................................................................................. 6.2 ohm at 400Hz
Aerial Input Inpedance ............................................................................................ 75 ohm Unbalanced
Receiving Channels
PAL-B/G
VHF ...........................................................................................................................E2 thru E12
UHF .........................................................................................................................E21 thru E69
CATV ...........................................................................................................................X thru Z + 2,
S1 thru S41
Receiving Frequency
VHF ........................................................................................................ 45.25 MHz thru 463.25 MHz
UHF ...................................................................................................... 471.25 MHz thru 863.25 MHz
Dimensions.................................................................................................................. Width : 800mm
Height : 579mm
Depth : 484mm
Weight (Approx) : 43.0kg
Specifications are subject to change without notice.
ELECTRICAL SPECIFICATIONS

3
SX68JS10
IMPOTANT SERVICE NOTES
Maintenance and repair of this receiver should be done by qualified
service peronnel only.
SERVICING OF HIGH VOLTAGE SYSTEM AND
PICTURE TUBE
When servicing the high voltage system, remove static charge from it
by connecting a 10k ohm Resistor in series with an insulated wire (such
as a test probe) between picture tube dag and 2nd anode lead. (AC line
cord should be disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after dis-
charging the high voltage completely.
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an ab-
solute minimum. Since certain malfunctions or servicing many pro-
duce potentially hazardous radiation with prolonged exposure at close
range, the following precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than
33.0 kV (at beam 0µA) for the set.
2. To keep the set in a normal operation, be sure to make it function on 29.5 ±1.5kV
(at beam 1.7 mA) in the case of the set.The set has been factory-Adjusted to the
above mentioned high voltage.
If there is a possibility that the high voltage fluctuates as a result of repairs,
never forget to check for such high voltage after the work.
3. Do not substitute a picture tube with unauthorized types and/or brands which may
cause excess X-Ray radiation.
BEFORE RETURNING THE RECEIVER
Before returning the receiver to the user,perform the following safety
checks.
1. Inspect all lead dress to make certain that the leads are not pinched or that hardware
is not lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating
fishpapers, cabinet backs, adjustment and compartment covers or shields, iso-
lation resistor- capacity networks, mechanical insulators etc.

SX68JS10
4
ADJUSTMENT PRECAUTION
The model is a mixture of the adjustment items of I2C BUS-CONTROL and the existing analog adjustment. Moreo-
ver, since the adjustment with I2C BUS-CONTROL is composed of the items which are set with the initial values
(preset values) alone and the data variable items, refer to the following.
1) Setting method to the microcomputer service mode
1When the TP1001/1002 are short-circuited, enter into the service mode (I2C BUS CONTROL adjustment
mode).
2The modes can be sequentially selected with the CH DOWN key of R/C. (or button of set behind door.)
3The modes can be sequentially selected in the reversed order of 2with the CH UP key of R/C.(or button of
set behind door.)
4The data can be converted with the VOLUME UP/DOWN key of R/C. (or button of set behind door.)
5When the short circuit between the TP1001/1002 is cut off, it will be released from the service mode.
2) Initial value (preset value) setting
1When the MAIN POWER switch set at the service mode side is turned on, the initial value will be automatically
set only on the new E2PROM (discriminated with the head 4 bytes).
2The initial data is set as shown in the attached sheets.
3Take care that there are the items which need be changed and the items in which the initial values continue
set.
Instruct that it must set at the service mode side as shown in Item 2-1and the MAIN POWER switch must
be turned on when the lamp is first turned on after the chassis is assembled.
Take care that the beam current may excessively flow if the lamp is turned on unless E2PROM is initialized.
3) Since the E2PROM memory is submitted with the attached sheets for reference, use it.

5
SX68JS10
SERVICE MODE
The service key selects the service mode. (Refer to the attached table.)
Select the item with CH UP/DOWN key, and change the data with VOL UP/DOWN key.
Moreover, in the service mode, the item can be directly selected by entering the following key.
Service item R/C-CODE Remarks
SERVICE MODE
CUTOFF BKGD
CUTOFF BKGD DVD
V-AMP50
V-LINE50
V S-CORR50
V-CENT50
H-CENT50
H-SIZE50
E/W PAR
E/W COR
TRAPE
SCM BELL
SCM R-Y
SCM B-Y
SUB COL
SUB COL DVD
SUB TINT
SUB TINT DVD
SUB BRI
SUB BRI DVD
SUB CONT
SUB CONT DVD
SUB VOL
V-AMP60
V-LINE60
V S-CORR60
V-CENT60
H-CENT60
H-SIZE60
CONT-UP
CONT-UP
COL-UP
COL-DOWN
BRI-UP
BRI-DOWN
TINT-UP
TINT-DOWN
CONT-DOWN
SPA-DOWN
BAL-UP
SHARP-UP
SHARP-DOWN
TRE-UP
SPA-UP
SPA-UP
BASS-DOWN
BASS-DOWN
BASS-UP
BASS-UP
TRE-DOWN
TRE-DOWN
BAL-DOWN
COL-UP
COL-DOWN
BRI-UP
BRI-DOWN
TINT-UP
TINT-DOWN
*1
*1
*1
*1
*1
*2
*2
*2
*2
*2
*2
*1 To receive DVD, switch the key input.
*2 To receive the main 60Hz when inputting the key, switch it from 50Hz key.

SX68JS10
6
Data at Address 00H thru 03H of E2PROM are read during shift to the service mode.
If any data is different from the following, E2PROM will be initializes as shown in the table.
00H : 23 01H : 77 02H : 42 03H : A5
• Adjusting item
1. Service mode 1
No.
0 Blank SERVICE MODE
28 Parabola adjustment 0~63 E/W PAR PDC E-W PARABORA 46 42 29 Corner adjustment 0~31 E/W COR PDC E-W CORNER 19 19 30 Trapezoid compensation 0~127 TRAPE PDC TRAPEZIUM 61 66 34 BELL filter adjustment 0~255 SCM BELL SECAM BELL FILTER 122 120
8 SECAM R-Y adjustment 0~15 R-Y SECAM R-Y 8 6 9 SECAM B-Y adjustment 0~15 B-Y SECAM B-Y 68
24 COLOUR sub adjustment 0~127 SUB COL V/C/D COLOUR 70 Center value to user COLOUR adjustment 60 25 COLOUR sub adjustment(DVD) 0~127 SUB COL DVD V/C/D COLOUR 67 Center value to user COLOUR adjustment the DVD mode 60 10 BRIGHTNESS sub adjustment 0~255 SUB BRI V/C/D BRIGHTNESS Center value to user BRIGHTNESS adjustment 122176 11 BRIGHTNESS sub adjustment (DVD) 0~255 SUB BRI DVD V/C/D BRIGHTNESS
Center value to user BRIGHTNESS adjustment the DVD mode 116
149
12 SUB CONTRAST sub adjustment 0~31 SUB CONT V/C/D SUB CONTRAST 20 17 13 SUB CONTRAST sub adjustment (DVD) 0~31 SUB CONT DVD V/C/D SUB CONTRAST 19 16 35 Sound volume adjustment 0~63 SUB VOL SPA VOLUME Max value to user VOLUME adjustment 4950 16 Vertical size adjustment (60Hz) 0~127 V-AMP60 PDC V-AMPLITUDE 110 97 17 Vertical linearity adjustment (60Hz) 0~31 V-LINE60 PDC V-LINEARITY 21 24 18 Vertical S type compensation adjustment (60Hz) 0~63 V S-CORR60 PDC V-S.CORRECTION 40 40 20 Horizontal position adjustment (60Hz) 0~31 H-CENT60 V/C/D H-PHASE 17 16 21 Horizontal size adjustment (60Hz) 0~63 H-SIZE60 PDC H-SIZE 31 27 27 Vertical position 0~3 V-SHIFT PDC V-SHIFT REG 2 2 31 Horizontal high voltage compensation 0~7 H-COM PDC H-COMPENSATION 4 4 26 Vertical high voltage compensation 0~7 V-COM PDC V-COMPENSATION 7 7 33 Vertical compensation 0~15 V-∫COR PDC V-∫CORRECTION 10 10
22 Colour decoder TINT adjustment (AUTO) 0~127 COL TINT AUTO V/C/D COLOUR DECODER 67 67 23 Colour decoder TINT adjustment (forcible) 0~127 COL TINT V/C/D COLOUR DECODER 56 58 32 Horizontal position 0~7 H-CENT PDC H-CENT 3 3
2 Vertical size adjustment (50Hz) 0~127 V-AMP50 PDC V-AMPLITUDE 110 97 1 Cutoff adjustment CUTOFF BKGD * * R30 G66 B0 G-D-62 B-D-72 3 Vertical linearity adjustment (50Hz) 0~31 V-LINE50 PDC V-LINEARITY 23 26 4 Vertical S type compensation adjustment (50Hz) 0~63 V S-CORR50 PDC V-S.CORRECTION 40 40 5 Vertical position adjustment (50Hz) 0~7 V-CENT50 V/C/D V-PHASE 4 5 6 Horizontal position adjustment (50Hz) 0~31 H-CENT50 V/C/D H-PHASE 13 14 7 Horizontal size adjustment (50Hz) 0~63 H-SIZE50 PDC H-SIZE 32 26
14 SUB-TINT adjustment 0~127 SUB TINT V/C/D TINT 59 Center value to user TINT adjustment 15 SUB-TINT adjustment(DVD) 0~127 SUB TINT DVD V/C/D TINT 54 Center value to user TINT adjustment the DVD mode 54 19 Vertical position adjustment (60Hz) 0~7 V-CENT60 V/C/D V-PHASE 1 2
Initial value Data range OSD display IC Data setting Initial value Remarks
[Remarks] *1 When 50Hz data is set, the setting data is increased or decreased to set 60Hz data.
(However, 50Hz data does not vary when 60Hz data is set.)
*2 Because of the fixed data, it is unnecessary to set the data unless otherwise specified. *3 It is impossible to set (use) the data “6” and “7”. Use “0” thru “5”.
Moreover, check whether “6” and “7” are used or not.
*4 When the data for the 1-screen mode is set, the set data is increased or decreased to set the data for the 2-screen mode.

7
SX68JS10
INITIAL SETTING AT FACTORY
SKIP ON (POS 0), OFF (POS 1~99)
Image system AUTO (All POS)
IGR forcible FM OFF (All POS)
IGR ST STEREO (All POS)
IGR DS MAIN (All POS)
Last POWER ON
TV/AV TV
Last POS 1
FB POS 1
SAVE OFF
AUTOSELECT ON
BLUEBACK OFF
DIGIT 2 DIGIT
H/P VOL 0
BALANCE 0 (Center)
VOLUME 0
OFF-TIMER Not set.
ON-TIMER POS Not set.
ON-TIMER VOL Not set.
REMINDER Not set.
Entertainment MOVIE
<AV menu : Entertainment>
Mode
CONTRAST
COLOUR
BRIGHTNESS
TINT
SHARPNESS
WHITE-TEMP
YNR
S-BOOST
SPATIALIZER
TREBLE
BASS
STANDARD
60
0
0
0
0
0
OFF
OFF
OFF
0
0
MUSIC
60
0
0
0
0
+1 step to Blue
ON [I]
ON [III]
ON [I] : 0
0
0
MOVIE
60
0
0
0
0
+1 step to Red
ON [I]
ON [II]
ON [I] : 0
0
0
NEWS
60
0
0
0
0
0
ON [I]
ON [I]
OFF
0
0
<Shipment setting key>
Voice system
B/G LANGUAGE ENGLISHINITIAL 3
<Factory setting and geomagnetic adjustment mode by model (reference)>
Background
12,300°K
X
0.272
Y
0.275

SX68JS10
8
DIGITAL COMB FILTERY LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1Digital comb filter
Y level adjust-
ment
R5406
1Input PAL colour bar signal (100% white colour
bar) of 1.0Vp-p at the 75Ωterminator from AV-
IN terminal.
(Input level 1.0Vp-p ±0.05Vp-p)
2Connect the oscilloscope to TP5400.
3AdjustR5406tomaketheYsignal (100% white)
of TP5400 become 2.0 ±0.1Vp-p.
* Verify that all are linearly amplified.(100% white
area must not be collapsed.)
When it is adjusted at E-12ch, take
care for the voltage value.
SERVICE ADJUSTMENT
PIF CHECK ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1RF-AGC
Cut-inadjustment
(Already preset.)
1E-12CH (PAL Colour Bar) is received.
Electric field strength:54 ±1dBµV (75ΩOpen)
2Connect the oscilloscope to TP210 as shown
below.
Note: If the impedance converter of
50/75 is not used at the electric
field strength meter of 50Ωsys-
tem, set 52 ±1dBV for 54 ±
1dBµV (75ΩOpen).
Moreover, take care for the loss
if the converter is used.
Fig. 3-1
3Lower the input electric field strength to 51 ±
1dBµV (75ΩOpen).
4Under the conditions 1and 3, TP210 volt-
age does not vary.
Raise the input signal electric field strength to
60 ±1dBµV (75ΩOpen), and verify that it is
0.1V or more lower thanTP210 of 1and 3.
5Set the signal at 63 to 67dBµV, and verify that
any noise is not output.
6Set the signal at 90 to 95dBµV, and verify that
any black letter beat is not output.
VIDEO LEVEL ADJUSTMENT
1 VIDEO DET
Level adjustment
R220
1E-12CH B/G-PAL colour bar (100% white bar)
is received.
2Adjust R220 to make the video output of the
AV-OUT terminal become1.0 ±0.05Vp-p atthe
75Ωterminator.
NO. Adjustment part Adjusting procedure and conditions Waveform and others
* If there is not any problem when the
several lots of the model which em-
ploys the relevant tuner is checked,
apply the check of only 5and 6.
0.1V
Bias
box
TP210
TV SETOscilloscope
Bias Box: About 4.5V

9
SX68JS10
PAL CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1-1 SUB-COLOUR
I2C bus adjust-
ment (RF signal)
1E-12CH(PAL colour bar) is received.
2Make the image normal with the remote con-
troller.
3Connect the oscilloscope to TP3802. (10:1
probe is used.)
Range: 2V/Div.
Sweep time : 20µsec/Div.
4Set the sub colour adjustment mode with the
remote controller, and vary the sub colour data
to make 100%W of the colour bar and RED at
the same level for adjustment shown in Fig. 1-
1.
Fig. 1-1
Cy G
75%W Y 100%W Mg R
B
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1-1 SUB-TINT
I2C bus adjust-
ment (RF signal)
1Selectthesub-tint adjustment mode (automatic
Y cut) to receive JA-8CH(NTSC colour bar).
2Connect the oscilloscope to TP800 (B-Y).
Range : 20mV/Div. (AC)
Sweep time: 20µsec/Div. (10:1 probe is used.)
3Vary the sub tint data to adjust the waveform to
be gained as shown in Fig.1-1.
TP3803...........(KY) 6 pin
(B-Y)
W Y Cy G Mg R B
1-2 * SUB-TINT
I2C bus adjust-
ment (DVD
signal)
1Selectthesub-tint adjustment mode (automatic
Y cut) to receive the DVD colour bar signal.
2Connect the oscilloscope to TP800(B-Y).
Range : 20mV/Div. (AC)
Sweep time:20µsec/Div.(10:1 probe is used.).
3Vary the sub tint data to adjust the waveform to
be gained as shown in Fig.1-1.
4Release the adjustment mode.
(B-Y)
W Y Cy G Mg R B
NTSC CHROMA ADJUSTMENT
1-2 * SUB-COLOUR
I2C bus adjust-
ment (DVD
signal)
1DVD signal is received.(Half colour bar signal)
2Make the image normal with the remote con-
troller.
3Connect the oscilloscope to TP3802. (10:1
probe is used.)
Range : 2V/Div.
Sweep time: 20µsec/Div.
4Setthesubcolour adjustment mode (DVD)with
the remote controller, and vary the sub colour
(DVD) data to make 100%W of the colour bar
and RED at the same level for adjustment
shown in Fig. 1-2. (* It is being examined.)
Fig. 1-2
Cy G
WY
100%W Mg R
B
Fig. 1-1
Fig. 1-1

SX68JS10
10
SOUND LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1SUB VOL (Bus
adjustment) 1Receive E-12ch (PAL colour bar). Signal con- tent: 400Hz 100% Mod.
2Connect the probe of the meter (*) to (SI) con-
nector.
3Select SUB-VOL in the service mode.
4Adjust the SUB-VOL data (At L-ch).
Adjustment value : 11.2 ±0.3Vrms
Adjustment value : 11.2 – 0.05Vrms
1Receive E-12CH (PAL colour bar).
2Maximize the sound volume to verify that the
sound is output from the speaker. Then, set
the non-signal state.
3At this time, verify that the audio mute oper-
ates.
4After checking the operation, set the sound
volume to be the smallest.
Note:
* SPATIALIZER OFF
* S-Normal state
* S-VOL Max
* S-BOOSTER OFF
* : Use the multimeter or similar
which sufficiently attenuates the
high-band frequency (bigger than
100kHz).
SIF (IGR) ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1VCO COIL
T2300 1Receive E-69CH (PAL colour bar). (Setthereceivingfrequencyat AFT OFF 855.25
MHz.)
2Connect the digital voltmeter to TP202 (in the
main unit).
3Verify that it is turned counterclockwise to 0V
and clockwise to 5V, and adjustT2300 to make
the DC voltage ofTP202 become 2.5 ±0.1V in
the range.
* Single-unit adjustment
Vcc 5V ±0.1V
IF input frequency 38.9MHz ±10kHz
Control it under these conditions.
AdjustT2300to maketheDC voltageofTP2300(in
the NICAM unit) become 2.5 ±0.1V.
After single-unit adjustment, check the practical
setup.
Align the receiving frequency to the select chan-
nel frequency. (AFT OFF)
The checked voltage must be 2.5V ±1.0V.
(Take care that ±1.0 is considered for the Vcc dif-
ference between the single unit and unit, Fo differ-
ence and so on, but is not the adjustment preci-
sion.)
2 Noise mute
check

11
SX68JS10
CUT OFF, BKGD ADJUSTMENT METHOD
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1CRT CUT OFF
Service mode
I2C bus data
adjustment
1Receive E-5CH (Monoscope pattern).
2Select P-NORM with the remote controller.
3Turn on the service SW, and select the CUT
OFF BKGD mode.
4Select the screen VR 0/10.
5Press “-/--” key of the remote controller to se-
lect the lateral in-line mode.
9Turn the screen VR clockwise, and adjust the
first lighting lateral in-line raster to slightly light.
0Adjust the CUT OFF data of two other colours,
andcoarselyadjustthelateralin-linetobecome
white. (Note 1)
qTurn the screen VR in the opposite direction to
the point where the lateral in-line raster goes
out.
Note 1: Apply the adjustment after aging with
the beam current 1500 ±50µA or
more for 30 minutes or more.
wPress “-/--” key of the remote controller to se-
lect the normal mode.
1E-5CH (Monoscope pattern) is received.
2Select P-NOM with the remote controller.
3Connect the beam ammeter between TP1601
and TP1602.
4Coarsely adjust the beam current to approx.
1.7 mA with R1633 (sub-contrast VR).
5Receive the window pattern with AV input.
(PAL burst is generated with the signal
generator.)
6Withthe data ofG-driveand B-drive, adjustthe
colour temperature 12,300K of the white peak
to white.
7Adjust the right dark area of the window to
12,300K with R-cut off, G-cut off and B-cut off.
8Readjust the colour temperature at the white
peak.
9Check 12,300K at the low white.
Note 1 :Apply this adjustment after aging
with the beam current 1,500 ±50µA
or more for 30 minutes or more.
(On the white or green monocolour
screen)
On the monocolour screen of white
or green
Note 1 :
R CUT OFF UP "1" KEY
DOWN "4" KEY
G CUT OFF UP "2" KEY
DOWN "5" KEY
B CUT OFF UP "3" KEY
DOWN "6" KEY
Data up/down is possible with the
above comparison.
* 12300 °K X : 0.272
Y : 0.275
(With Minolta colour thermometer
CA-100)
Note 1 :
G-DRIVE UP "7" KEY
DOWN " " KEY
B-DRIVE UP "8" KEY
DOWN "0" KEY
Data up/down is possible with the
above comparison.
* The colour temperature is based on
the shipment initial setting table.
2-1 White balance
background
I2C bus adjust-
ment
(RF Signal)
1The window pattern is received with DVD sig-
nal (component signal).
2Apply the adjustment in the same manner as
2-15and subsequence above. (12,300K)
(G-DRIVE, B-DRIVE, R-CUTOFF, G-CUT-
OFF, B-CUTOFF)
Apply the adjustment after the end of 2-1.
Note 2 : Use the window pattern of
the signal generator for
adjustment.
(PAL and colour burst are present.)
Note 3 : Signal generator of 2-1, 2-2
use
"SX-1006"
2-2 * White balance
background
I2C BUS adjust-
ment (DVD
signal)

SX68JS10
12
SUB CONT SUB-BRIGHT ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
3MAX BEEM
R1633 1Receive E-5CH (Monoscope pattern) with standard mode.
2Make the image normal with the remote con-
troller.
3Connect the beam ammeter between TP1601
and TP1602.
Ammeter full scale 3mA range
TP1602 is connected at the - side of the
ammeter.
TP1601 is connected at the + side of the
ammeter.
4Adjust the beam current to 1.7mA ±50µA with
R1633 (sub-contrast VR).
Note : Apply the adjustment after aging with the
beam current 1,500 ±50µA or more for
30 minutes or more.
(On the white or green monocolour
screen)
1Select the DVD mode.
2Receive the signal of the DVD signal genera-
tor. (Component signal)
(Window pattern)
3Make the image normal with the remote con-
troller.
4SelecttheSUB-CONTRAST adjustment mode
(DVD) with the remote controller, and adjust
50% white to 110 ±3cd.
SUB-BRIGHT
I2C bus adjust-
ment (RF signal)
CUTOFF POINT
SUB-CONTRAST
I2C bus adjust-
ment (RF signal)
SUB-CONTRAST
I2C bus adjust-
ment (DVD
signal)
SUB-BRIGHT
I2C bus adjust-
ment (DVD
signal)
* WhenE-2CH(Crosshatchpattern) or
equivalent signal is received.
1Make the image normal with the
remote controller.
2Adjust the 3rd (1 thru 5 from the
left) black of the window pattern to
sink.
1Receive the window pattern with AV input.
2Make the image normal with the remote con-
troller.
3Selectthe sub-brightadjustmentmode with the
remotecontroller,andadjusttherightdarkwhite
area of the window pattern to 2.7cd ±0.3cd.
1Select the DVD mode.
2Receive the signal of the DVD signal genera-
tor. (Component signal) (Window pattern)
3Make the image normal with the remote con-
troller.
4Selectthe sub-brightadjustment mode (DVD),
and adjust the right dark white area of the win-
dow pattern to 2.7cd ±0.3cd of the window
pattern.
1Receive the window pattern with AV input.
2Make the image normal with the remote con-
troller.
3Selectthe SUB-CONTRAST adjustmentmode
withtheremotecontroller,andadjust50%white
to 110 ±3cd.
Note 1 : Use “Y” of Minolta colour
analyzer CA-100 in adjust-
ment 4-1, 4-2, 5-1, 5-2.
4-1
4-2
5-1
5-2
Note 2 : Window pattern of signal
generator is same ad JA-
12CH.
Note 3 : Use the signal generator
"SX-1006" for SUB-CONT.,
SUB-BRIGHT adjustment.

13
SX68JS10
HORIZONTAL/VERTICAL CIRCUIT ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
V-AMPLITUDE 50
V-LINEARITY 50Hz
V-SCORRECTION 50Hz
V-RHASE(50)
(V-CENTER)
H-RHASE(50)
(H-CENTER)
H-SIZE
E/W-PARABOLA
(SIDE-PIN)
V-BIAS
V-∫CORRECTION
EW-CORNER
(SUB-SIDEPIN)
TRAPEZIUM
V-COMPENSATION
H-COMPENSATION
OTHER
Adjust the overscan to 8.5% ±0.5%. (E-5)
Adjust the linearity to the best.
Already preset (**). (Adjust this unless the linear-
ity is achieved.)
Align the center of the screen to the geometric
center of CRT. (E-5)
Align the center of the screen to the geometric
center of CRT. (E-5)
Adjust the overscan to 8.5% ±0.5%. (E-5)
Adjust the 1st vertical line from the left and right
ends of the crosshatch to be straight.(E-2)
Already preset.
Already preset.
Adjust the end of the line of the crosshatch to be
straight.
Already preset. (Adjust if the quality is specially
poor.)
Already preset. (Adjust if the quality is specially
poor.)
Already preset. (Adjust if the quality is specially
poor.)
OntheitemsofV-AMPLITUDE60,V-LINEARITY60,
V-SCORRECTION60, V-RHASE60, H-RHASE60
andH-SIZE60,the compensation data isautomati-
cally input if the 50Hz mode adjustment is
done.
However, if it is largely deviated when
it is checked in the 60Hz mode,
readjust it in the 60Hz mode.
1Receive E-5CH (crosshatch pattern).
2With the remote controller, make the image
normal.
3Adjust the focusVR to make the vertical line of
"5" in "E-5" display upper left part of screen as
fine as possible.
Focus adjust-
ment
This vertical line make
as fine as possible.
The receiving channel in ( ) are the
following signals.
(E-2): Crosshatch (50Hz)
(E-5): Monoscope (50Hz)
1
2

SX68JS10
14
FUNCTION OPERATION CHECK (1) (VIDEO AND AUDIO)
NO. Check item Adjusting procedure and conditions Waveform and others
CONTRAST
COLOUR
1If NORMAL key is pressed when the mode is
displayed in P/S-mode, the displayed content
alone must be set to be normal.
1Receive NTSC colour bar (AV input)
2In P-mode, select TINT.
3With UP/DOWN, the tint must be varied toward
green for UP, and toward red for DOWN.
1Receive E-5CH.
2In P-mode, select BRIGHT.
3The black level must be varied with UP/
DOWN.
1
2
BRIGHTNESS
3
1Receive J-13CH.
2In P-mode, select COLOUR.
3The colouring must be varied with UP/
DOWN.
(Any colour must not remain in MIN.)
1Receive E-5CH.
2In P-mode, select CONTRAST.
3The contrast must be varied with UP/DOWN.
4TINT
NORMAL
5
1Receive E-5CH.
2In P-mode, select SHARPNESS.
3The screen quality must be varied with UP/
DOWN.
1All CH (0 thru 99) sign must be displayed in
green.
1Receive E-5CH.
2In S-mode, selectTREBLE.
3The high band must be varied with UP/DOWN.
91Receive E-5CH.
2In S-mode, select BASS.
3The low band must be varied with UP/DOWN.
1Receive E-5CH.
2In S-mode, select BALANCE.
3Verify that the left/right balance must be varied
with UP/DOWN.
6SHARPNESS
7CH sign display
colour
8TREBLE
BASS
10 BALANCE

15
SX68JS10
NO. Check item Adjusting procedure and conditions Waveform and others
1When E-12CH colour bar is received and B/G
is selected in the sound system,
Verify that the sound must not be properly
output.
SOUND SYS-
TEM
1Receive E-5CH music broadcast.
2The sound mode must be switched with
SPATIALIZER key (R/C) as follows.
SPATIALIZER OFF ↓
SPATIALIZER 1 ↓
SPATIALIZER 2 ↓
3Verify that the sound from the speaker in the
MONO mode is felt to be wide.
R/C key or MENE screen
14 1Receive E-5CH music broadcast.
2Switch S-BOOSTER in S-mode as below.
OFF – 1 – 2 – 3
S-BOOSTER
FUNCTION OPERATION CHECK (2) (VIDEO AND AUDIO)
11 COLOUR
SYSTEM 1When receiving the E-12CH PAL colour bar, checkthat thecolour system canreceivein the
PAL mode only and that colour is reproduced
normally.
2When receiving the NTSC 4.43 colour bar in
the AV input mode and setting the colour sys-
tem to a mode except AUTO, N4.43, check
that colour is reproduced normally.
3When receiving the NTSC 3.58 colour bar in
the AV input mode and setting the colour sys-
tem to a mode except AUTO, N3.58, check
that colour is not reproduced normally.
12
13 SPATIALIZER
Key

SX68JS10
16
NO. Check item Adjusting procedure and conditions Waveform and others
H, V protector 1Receive E-5CH (monoscope pattern).
2Connect the bias box to the cathode side
(R1622 side) of D1604.
3Setthevoltageof the bias boxat 16V,andverify
that the protector does not operate.
4Setthevoltageof the bias boxat 24V,andverify
that the protector operates.
PROTECTOR OPERATION CHECK
Correspondence for short circuit of
smoothening electrolysis of +B line and so on
To check the operation of the protector and
so on, take care for the breakage, deteriora-
tion and so on of each element.
Other protectors
1
2
Reference Approx. 20 V as ordinary
A/V INPUT/OUTPUT CHECK
NO. Check item Adjusting procedure and conditions Waveform and others
Video output
check
Audio output
check
1
3 AV3 automatic
discrimination
check
1Receive TV with R/C.
2When the signal is input to the video input ter-
minalofAV3,itisautomaticallyswitchedtoAV3.
3When the signal is input to the S-video input
terminal of AV3, it is automatically switched to
AV3-S.
* Setting: Auto select in the feature — ON
Video input
check
Audio input
check
S-terminal input
check
1The mode must be switched in the cycle of TV
→AV1 →AV2 →AV3 →DVD →TV with TV/
AV key of R/C, and the image and voice which
correspondtoeach input/output terminals must
be properly output.
* Here, DVD is applied for the input alone.
2Whentheconnectoris inserted intotheS-video
inputterminalon AV1,it mustbe switched from
AV to S-video and must be properly operated.
Moreover,
check “AV1-S” of OSD.
3Whentheconnectoris inserted intotheS-video
inputterminalon AV3,it mustbe switched from
AV to S-video and must be properly operated.
Moreover,
check “AV3-S” of OSD.
2
1Receive E-12CH colour bar (colour bar audio
400Hz 100% MOD of 100% white).
2The video output must be within the specified
range of 1.0Vp-p ±3dB at the 75Ωterminator.
3The audio output must be within the specified
range of 1.76Vp-p ±3dB at the 10kΩtermina-
tor.

17
SX68JS10
Does D1002 (Power LED) turn on?
D1002 (Power LED) turn on and off.
TROUBLE SHOOTING TABLE (Continued)
NO RASTER
Normal
Check CRT connector (KY), (H) bias.
Does RY1700 turn on?
Turns on, but soon turns off.
Abnormal
Check IC3801, IC3802 and IC3803.
Check protecter circuit and its related parts (2) pin of IC1000 vertical pulse.
Check the power circuit consisting of IC700, IC752 and IC600.
Yes
Yes (RED)
Yes
(Bus error)
No
See many often D1002 flashes in red. This indicates which IC to check up.
No
A
B
Dose horizontal circuit momentary oscillate?
Check R1610, IC801 and its peripheral parts.
TROUBLE SHOOTING TABLE
Check the voltage at pin (6) of IC1501 and pin (6) of IC1500.
NO VERTICAL SCAN
Check IC1500, IC1501 and related circuits
Normal Abnormal Normal
Check IC801 and its peripheral parts.
Check vertical trigger pulse at pin (31) of IC801. Check D1602, R1610 and
L1500.
Abnormal

SX68JS10
18
TROUBLE SHOOTING TABLE (Continued)
Check the peripheral circuit of IC1700, IC1701, IC1750 and D1752.
Check the power circuit consisting of T700, IC700 etc.
Normal
Check F700.
Replace the Fuse.
Is the Fuse again blown out?
Does 5V appear at pin (27), (18) of IC1000.
Blown out
A
No
NoYes
Yes
Check IC1000, IC1002, Q1005, Q1750 and Q1751.
TROUBLE SHOOTING TABLE (Continued)
B
E2PROM (IC1001) V/C/D (IC801) PDC (IC1500) AV-SW (IC401) SPATIALIZER (IC300) IGR (IC2300) PLL (TU200) DCF (IC5400) 4ch DAC (IC1003)
500 500 2000 (ms)
2000 (ms)500 500
2000 (ms)500 500
2000 (ms)500 500
2000 (ms)500 500
2000 (ms)
500 500
2000 (ms)
500 500
2000 (ms)
500 500
2000 (ms)
500 500
Bus-Err
Bus-Err Bus-Err Bus-Err Bus-Err Bus-Err Bus-Err Bus-Err Bus-Err

19
SX68JS10
Check TU200, Q204 etc. Does 5V appear at pin (7) of TU200. Check L201, IC751 etc.
No
Yes
TROUBLE SHOOTING TABLE (Continued)
NO PICTURE
Does the snow noise appear on the picture tube at max contrast and brishtness control?
C
Snow noise increase.
Does 9V appear at pin (6) of TU200 (TUNER). Check IC750, L202, TU200
etc.
No
Does 33V appear at pin (9) of TU200. Check IC753, L203 etc.
Yes
No
Yes
No
TROUBLE SHOOTING TABLE (Continued)
Normal
No snow noise.
Check pin (19) of TU200.
Abnormal
C
Noise or signal appear. Is AV1, AV2, AV3 or DVD input normal? Check Q200, Q201, Q203
and their peripheral circuit.
Check TU200(TUNER) and its related parts.
Yes
No
Check pin (36) of IC401 noise or signal appear?
Check IC401 its peripheral circuit.
No
Yes
Check pin (15) of IC801 noise or signal appear?
Check IC400, Q404, Q410, Q412 and their peripheral circuit.
Check IC801 RGB out Normal?
Check IC800, IC802, IC803 and their peripheral circuit.
Check the peripheral circuits of screen heater (FBT) and the CRT.
Check IC3801, IC3802, IC3803 and their peripheral circuit.
Yes
Are pin (8) of IC3801, pin (8) of IC3802 and pin (8) of IC3803.
Yes
No No Yes No

SX68JS10
20
No Yes
YesNo
Is there audio signal at pins (5), (6) of IC401?
Check IC401 and its peripheral circuit.
Check TU200 peripheral parts.
Check TU200 and its peripheral circuits of no problem, set the sound system inpositon.
TROUBLE SHOOTING TABLE (Continued)
NO NORMAL SOUND
Is audio output terminal J401 normal.
Yes
YesNo
No
TV sound. Is there audio signal at pins (6), (25)
of IC300?
Change the sound system. Is sound normal? Check IC401
peripheral parts.
Is there audio signal at pin (9) of IC1300 and IC1301?
No
No
Yes
Check IC300.
Yes
Check IC1300, IC1301 and their peripheral parts.
Set S-Volume at maximum. Do pins (15), (18) of IC300 work?
Check IC302, IC305, IC303, IC304 and their peripheral circuit.
Check IGR unit peripheral circuit.
NoYes
Yes Yes
Yes
Yes
No
No
Turn on colour control. Does colour appeart?
TROUBLE SHOOTING TABLE (Continued)
NO SPECIFIC COLOUR
D
Is only RF signal's colour abnormal?
Set colour control.
Turn on colour system forced switch. Does colour appear?
Fix cotrol to coloured system.
Check IC5400, Q402 and their peripherals.
No
Check D1603 and its peripherals.
Check IC801.
Check TU200, Q200, Q201, Q203, IC401 and their peripherals.
Yes
Yes
Yes
No
No
Is chroma input level of IC801 pin (13) proper? Is FBP signal waveforms at pin (25) of IC801 proper?
Are signal waveforms at pin (26)of IC800 and pin (27) of IC800 proper?
Are waveforms at pins (51) and (52) of IC801 proper?
Is SCP signal waveform at pin (2) of IC801 proper?
No
NO COLOUR
Check IC801.
Check IC800, IC802, IC803 and their peripherals.
No
PAL, NTSC4.43: Check X800, pin (8) of IC801 and their peripherals. NTSC3.58: Check X801, pin (10) of IC801 and their peripherals.