Sharp SX68JS10 Schematic
SERVICE MANUAL
SERVICE MANUAL
S79L8SX68JS10
COLOUR TELEVISION
Chassis No. SP-91
SX68JS10
SX68JS10
COLOUR TELEVISION
FEATURES .................................................................................................................................................... 2
ELECTRICAL SPECIFICATIONS .................................................................................................................. 2
IMPOTANT SERVICE NOTES....................................................................................................................... 3
ADJUSTMENT PRECAUTION....................................................................................................................... 4
MODEL SX68JS10
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
MODEL
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
CONTENTS
SX68JS10
Page
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user – serviceable
parts inside. Refer servicing to qualified service personnel.
SHARP CORPORATION
1
SX68JS10
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.
ELECTRICAL SPECIFICATIONS
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.
2
SX68JS10
ADJUSTMENT PRECAUTION
The model is a mixture of the adjustment items of I2C BUS-CONTROL and the existing analog adjustment. Moreover, 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
1 When the TP1001/1002 are short-circuited, enter into the service mode (I2C BUS CONTROL adjustment
mode).
2 The modes can be sequentially selected with the CH DOWN key of R/C. (or button of set behind door.)
3 The modes can be sequentially selected in the reversed order of 2 with the CH UP k ey of R/C. (or button of
set behind door.)
4 The data can be converted with the VOLUME UP/DOWN key of R/C. (or button of set behind door.)
5 When the short circuit between the TP1001/1002 is cut off, it will be released from the service mode.
2) Initial value (preset value) setting
1 When 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).
2 The initial data is set as shown in the attached sheets.
3 Take 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 2-1 and 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.
4
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
SX68JS10
*1 To receive DVD, switch the key input.
*2 To receive the main 60Hz when inputting the key, switch it from 50Hz key.
5
SX68JS10
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
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
(However, 50Hz data does not vary when 60Hz data is set.)
[Remarks]
*1 When 50Hz data is set, the setting data is increased or decreased to set 60Hz data.
6
Moreover, check whether “6” and “7” are used or not.
*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”.
*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.
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
SX68JS10
<AV menu : Entertainment>
MUSIC
60
0
0
0
0
+1 step to Blue
ON [I]
ON [III]
ON [I] : 0
0
0
CONTRAST
COLOUR
BRIGHTNESS
TINT
SHARPNESS
WHITE-TEMP
YNR
S-BOOST
SPATIALIZER
TREBLE
BASS
Mode
STANDARD
60
0
0
0
0
0
OFF
OFF
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
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
7
SX68JS10
SERVICE ADJUSTMENT
PIF CHECK ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
RF-AGC
1
Cut-in adjustment
(Already preset.)
1 E-12CH (PAL Colour Bar) is received.
Electric field strength: 54 ± 1dBµV (75Ω Open)
2 Connect the oscilloscope to TP210 as shown
below.
TP210
0.1V
TV SETOscilloscope
Bias Box: About 4.5V
Bias
box
Fig. 3-1
3 Lower the input electric field strength to 51 ±
1dBµV (75Ω Open).
4 Under the conditions 1 and 3, TP210 volt-
age does not vary.
Raise the input signal electric field strength to
60 ± 1dBµV (75Ω Open), and verify that it is
0.1V or more lower than TP210 of 1 and 3.
5 Set the signal at 63 to 67dBµV, and verify that
any noise is not output.
6 Set the signal at 90 to 95dBµV, and verify that
any black letter beat is not output.
Note: If the impedance converter of
50/75 is not used at the electric
field strength meter of 50Ω system, set 52 ± 1dBV for 54 ±
1dBµV (75Ω Open).
Moreover , take care f or the loss
if the converter is used.
* If there is not any problem when the
several lots of the model which employs the relevant tuner is checked,
apply the check of only 5 and 6.
VIDEO LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1 VIDEO DET
Level adjustment
R220
1 E-12CH B/G-PAL colour bar (100% white bar)
is received.
2 Adjust R220 to make the video output of the
A V -OUT terminal become 1.0 ± 0.05Vp-p at the
75Ω terminator.
DIGITAL COMB FILTER Y LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
Digital comb filter
1
Y level adjustment
R5406
1 Input P AL colour bar signal (100% white colour
bar) of 1.0Vp-p at the 75Ω terminator from AVIN terminal.
(Input level 1.0Vp-p ± 0.05Vp-p)
2 Connect the oscilloscope to TP5400.
3 Adjust R5406 to make the Y signal (100% white)
of TP5400 become 2.0 ± 0.1Vp-p.
* V erify 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.
8
PAL CHROMA ADJUSTMENT
Cy G
75%W Y
100%W
Mg
R
B
(B-Y)
W Y Cy G Mg R B
(B-Y)
W Y Cy G Mg R B
Cy G
WY
100%W Mg R
B
NO. Adjustment part Adjusting procedure and conditions Waveform and others
SUB-COLOUR
1-1
I2C bus adjustment (RF signal)
1-2 * SUB-COLOUR
I2C bus adjustment (DVD
signal)
1 E-12CH(PAL colour bar) is received.
2 Make the image normal with the remote con-
troller.
3 Connect the oscilloscope to TP3802. (10:1
probe is used.)
Range: 2V/Div.
Sweep time : 20µsec/Div.
4 Set the sub colour adjustment mode with the
remote controller, and v ary 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.
1 DVD signal is received. (Half colour bar signal)
2 Make the image normal with the remote con-
troller.
3 Connect the oscilloscope to TP3802. (10:1
probe is used.)
Range : 2V/Div.
Sweep time: 20µsec/Div.
4 Set the sub colour 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. 1-1
Fig. 1-2
SX68JS10
NTSC CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
SUB-TINT
1-1
I2C bus adjustment (RF signal)
1-2 * SUB-TINT
I2C bus adjustment (DVD
signal)
1 Select the sub-tint adjustment mode (automatic
Y cut) to receive JA-8CH(NTSC colour bar).
2 Connect the oscilloscope to TP800 (B-Y).
Range : 20mV/Div. (AC)
Sweep time: 20µsec/Div. (10:1 probe is used.)
3 Vary the sub tint data to adjust the wavef orm to
be gained as shown in Fig. 1-1.
TP3803...........(KY) 6 pin
Fig. 1-1
1 Select the sub-tint adjustment mode (automatic
Y cut) to receive the DVD colour bar signal.
2 Connect the oscilloscope to TP800(B-Y).
Range : 20mV/Div. (AC)
Sweep time: 20µ sec/Div. (10:1 probe is used.).
3 Vary the sub tint data to adjust the wavef orm to
be gained as shown in Fig. 1-1.
4 Release the adjustment mode.
Fig. 1-1
9
SX68JS10
SOUND LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
SUB VOL (Bus
1
adjustment)
1 Receive E-12ch (PAL colour bar). Signal con-
tent: 400Hz 100% Mod.
2 Connect the probe of the meter (*) to (SI) con-
nector.
3 Select SUB-VOL in the service mode.
4 Adjust the SUB-VOL data (At L-ch).
Adjustment value : 11.2 ± 0.3Vr ms
Adjustment value : 11.2 – 0.05Vrms
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).
2 Noise mute
check
1 Receive E-12CH (PAL colour bar).
2 Maximize the sound volume to verify that the
sound is output from the speaker. Then, set
the non-signal state.
3 At this time, verify that the audio mute oper-
ates.
4 After checking the operation, set the sound
volume to be the smallest.
SIF (IGR) ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
VCO COIL
1
T2300
1 Receive E-69CH (PAL colour bar).
(Set the receiving frequency at AFT OFF 855.25
MHz.)
2 Connect the digital voltmeter to TP202 (in the
main unit).
3 Verify that it is turned counterclockwise to 0V
and clockwise to 5V, and adjust T2300 to make
the DC voltage of TP202 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.
Adjust T2300 to mak e the DC voltage of TP2300(in
the NICAM unit) become 2.5 ± 0.1V.
After single-unit adjustment, check the practical
setup.
Align the receiving frequency to the select channel frequency. (AFT OFF)
The checked voltage must be 2.5 V ± 1.0V.
(Take care that ±1.0 is considered for the Vcc difference between the single unit and unit, F o difference and so on, but is not the adjustment precision.)
10
CUT OFF, BKGD ADJUSTMENT METHOD
NO. Adjustment part Adjusting procedure and conditions Waveform and others
CRT CUT OFF
1
Service mode
I2C bus data
adjustment
1 Receive E-5CH (Monoscope pattern).
2 Select P-NORM with the remote controller.
3 Turn on the service SW, and select the CUT
OFF BKGD mode.
4 Select the screen VR 0/10.
5 Press “-/--” key of the remote controller to se-
lect the lateral in-line mode.
9 Turn the screen VR clockwise, and adjust the
first lighting lateral in-line raster to slightly light.
0 Adjust the CUT OFF data of two other colours,
and coarsely adjust the lateral in-line to become
white. (Note 1)
q T urn 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.
w Press “-/--” key of the remote controller to se-
lect the normal mode.
On the monocolour screen of white
or green
SX68JS10
2-1 White balance
background
I2C bus adjustment
(RF Signal)
1 E-5CH (Monoscope pattern) is received.
2 Select P-NOM with the remote controller.
3 Connect the beam ammeter between TP1601
and TP1602.
4 Coarsely adjust the beam current to approx.
1.7 mA with R1633 (sub-contrast VR).
5 Receive the window pattern with AV input.
(PAL burst is generated with the signal
generator.)
6 With the data of G-drive and B-drive, adjust the
colour temperature 12,300K of the white peak
to white.
7 Adjust the right dark area of the window to
12,300K with R-cut off, G-cut off and B-cut off .
8 Readjust the colour temperature at the white
peak.
9 Check 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)
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.
* White balance
2-2
background
I2C BUS adjustment (DVD
signal)
1 The window pattern is received with DVD sig-
nal (component signal).
2 Apply the adjustment in the same manner as
2-15 and subsequence above. (12,300K)
(G-DRIVE, B-DRIVE, R-CUTOFF, G-CUTOFF, B-CUTOFF)
Apply the adjustment after the end of 2-1.
11
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"
SX68JS10
SUB CONT SUB-BRIGHT ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
MAX BEEM
3
R1633
SUB-CONTRAST
4-1
I2C bus adjustment (RF signal)
1 Receive E-5CH (Monoscope pattern) with
standard mode.
2 Make the image normal with the remote con-
troller.
3 Connect 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.
4 Adjust 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)
1 Receive the window pattern with AV input.
2 Make the image normal with the remote con-
troller.
3 Select the SUB-CONTRAST adjustment mode
with the remote controller, and adjust 50% white
to 110 ± 3cd.
Note 1 : Use “Y” of Minolta colour
analyzer CA-100 in adjustment 4-1, 4-2, 5-1, 5-2.
SUB-CONTRAST
4-2
I2C bus adjustment (DVD
signal)
SUB-BRIGHT
5-1
I2C bus adjustment (RF signal)
SUB-BRIGHT
5-2
I2C bus adjustment (DVD
signal)
1 Select the DVD mode.
2 Receive the signal of the DVD signal genera-
tor. (Component signal)
(Window pattern)
3 Make the image normal with the remote con-
troller.
4 Select the SUB-CONTRAST adjustment mode
(DVD) with the remote controller, and adjust
50% white to 110 ± 3cd.
1 Receive the window pattern with AV input.
2 Make the image normal with the remote con-
troller.
3 Select the sub-bright adjustment mode with the
remote controller, and adjust the right dark white
area of the window pattern to 2.7cd ± 0.3cd.
1 Select the DVD mode.
2 Receive the signal of the DVD signal genera-
tor. (Component signal) (Window pattern)
3 Make the image normal with the remote con-
troller.
4 Select the sub-bright adjustment mode (DVD),
and adjust the right dark white area of the window pattern to 2.7cd ± 0.3cd of the window
pattern.
Note 2 : Window pattern of signal
generator is same ad JA12CH.
Note 3 : Use the signal generator
"SX-1006" for SUB-CONT.,
SUB-BRIGHT adjustment.
* When E-2CH (Crosshatch pattern) or
equivalent signal is received.
1 Make the image normal with the
remote controller.
2 Adjust the 3rd (1 thr u 5 from the
left) black of the window pattern to
sink.
CUTOFF POINT
12
HORIZONTAL/VERTICAL CIRCUIT ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
V-AMPLITUDE 50
1
V-LINEARITY 50Hz
V-SCORRECTION 50Hz
V-RHASE(50)
(V-CENTER)
Adjust the overscan to 8.5% ± 0.5%. (E-5)
Adjust the linearity to the best.
Already preset (**). (Adjust this unless the linearity is achieved.)
Align the center of the screen to the geometric
center of CRT. (E-5)
The receiving channel in ( ) are the
following signals.
(E-2): Crosshatch (50Hz)
(E-5): Monoscope (50Hz)
SX68JS10
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
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.)
On the items of V -AMPLITUDE60, V -LINEARITY60,
V-SCORRECTION60, V-RHASE60, H-RHASE60
and H-SIZE60, the compensation data is automatically 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.
2
Focus adjustment
1 Receive E-5CH (crosshatch pattern).
2 With the remote controller, make the image
normal.
3 Adjust the focus VR to make the v ertical line of
"5" in "E-5" display upper left part of screen as
fine as possible.
This vertical line make
as fine as possible.
13
SX68JS10
FUNCTION OPERATION CHECK (1) (VIDEO AND AUDIO)
NO. Check item Adjusting procedure and conditions Waveform and others
1
CONTRAST
2
COLOUR
1 Receive E-5CH.
2 In P-mode, select CONTRAST.
3 The contrast must be varied with UP/DOWN.
1 Receive J-13CH.
2 In P-mode, select COLOUR.
3 The colouring must be varied with UP/
DOWN.
(Any colour must not remain in MIN.)
BRIGHTNESS
3
4
TINT
5
NORMAL
SHARPNESS
6
7
CH sign display
colour
1 Receive E-5CH.
2 In P-mode, select BRIGHT.
3 The black level must be varied with UP/
DOWN.
1 Receive NTSC colour bar (AV input)
2 In P-mode, select TINT.
3 With UP/DOWN, the tint must be varied toward
green for UP, and toward red for DOWN.
1 If NORMAL key is pressed when the mode is
displayed in P/S-mode, the displayed content
alone must be set to be normal.
1 Receive E-5CH.
2 In P-mode, select SHARPNESS.
3 The screen quality must be varied with UP/
DOWN.
1 All CH (0 thru 99) sign must be displayed in
green.
TREBLE
8
BASS
9
10 BALANCE
1 Receive E-5CH.
2 In S-mode, select TREBLE.
3 The high band must be varied with UP/DOWN.
1 Receive E-5CH.
2 In S-mode, select BASS.
3 The low band must be varied with UP/DOWN.
1 Receive E-5CH.
2 In S-mode, select BALANCE.
3 Verify that the left/right balance must be varied
with UP/DOWN.
14
FUNCTION OPERATION CHECK (2) (VIDEO AND AUDIO)
NO. Check item Adjusting procedure and conditions Waveform and others
11 COLOUR
SYSTEM
1 When receiving the E-12CH PAL colour bar,
check that the colour system can receive in the
PAL mode only and that colour is reproduced
normally.
2 When receiving the NTSC 4.43 colour bar in
the AV input mode and setting the colour system to a mode except AUTO, N4.43, check
that colour is reproduced normally.
3 When receiving the NTSC 3.58 colour bar in
the AV input mode and setting the colour system to a mode except AUTO, N3.58, check
that colour is not reproduced normally.
SX68JS10
SOUND SYS-
12
TEM
13
SPATIALIZER
Key
1 When E-12CH colour bar is received and B/G
is selected in the sound system,
Verify that the sound must not be properly
output.
1 Receive E-5CH music broadcast.
2 The sound mode must be switched with
SPATIALIZER key (R/C) as follows.
SPATIALIZER OFF ↓
SPATIALIZER 1 ↓
SPATIALIZER 2 ↓
3 Verify that the sound from the speaker in the
MONO mode is felt to be wide.
R/C key or MENE screen
14
S-BOOSTER
1 Receive E-5CH music broadcast.
2 Switch S-BOOSTER in S-mode as below.
OFF – 1 – 2 – 3
15
SX68JS10
A/V INPUT/OUTPUT CHECK
NO. Check item Adjusting procedure and conditions Waveform and others
Video output
1
check
Audio output
check
1 Receive E-12CH colour bar (colour bar audio
400Hz 100% MOD of 100% white).
2 The video output must be within the specified
range of 1.0Vp-p ± 3dB at the 75Ω terminator.
3 The audio output must be within the specified
range of 1.76Vp-p ± 3dB at the 10kΩ terminator.
Video input
2
check
Audio input
check
S-terminal input
check
3 AV3 automatic
discrimination
check
1 The mode must be switched in the cycle of TV
→ AV1 → AV2 → AV3 → DVD → TV with TV/
A V key of R/C, and the image and voice which
correspond to each input/output terminals must
be properly output.
* Here, DVD is applied for the input alone.
2 When the connector is inserted into the S-video
input terminal on AV1, it must be s witched from
AV to S-video and must be properly operated.
Moreover,
check “AV1-S” of OSD.
3 When the connector is inserted into the S-video
input terminal on AV3, it must be s witched from
AV to S-video and must be properly operated.
Moreover,
check “AV3-S” of OSD.
1 Receive TV with R/C.
2 When the signal is input to the video input ter-
minal of A V3, it is automatically switched to A V3.
3 When 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
PROTECTOR OPERATION CHECK
NO. Check item Adjusting procedure and conditions Waveform and others
H, V protector 1 Receive E-5CH (monoscope pattern).
1
2 Connect the bias box to the cathode side
(R1622 side) of D1604.
Reference Approx. 20 V as ordinary
2
Other protectors
3 Set the voltage of the bias box at 16V , and v erify
that the protector does not operate.
4 Set the voltage of the bias box at 24V , and v erify
that the protector operates.
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.
16
A
SX68JS10
No
Yes (RED)
Dose horizontal circuit
momentary oscillate?
NO RASTER
TROUBLE SHOOTING TABLE (Continued)
Does RY1700 turn on?
Yes
Turns on, but soon turns off.
Check CRT connector (KY), (H) bias.
Does D1002 (Power LED) turn on?
Abnormal
Normal
Check R1610,
IC801 and its
peripheral parts.
Check IC3801,
IC3802 and
IC3803.
D1002 (Power LED) turn on and off.
No
Check the
Yes
Check
(Bus error)
power circuit
consisting of
IC700, IC752
and IC600.
protecter circuit
and its related
parts (2) pin of
IC1000 vertical
pulse.
B
See many often
D1002 flashes
in red.
This indicates
which IC to
check up.
Check D1602, R1610 and
L1500.
Abnormal
NO VERTICAL SCAN
Check the voltage at pin (6) of IC1501 and
pin (6) of IC1500.
Check IC801 and its
peripheral parts.
TROUBLE SHOOTING TABLE
Normal Abnormal
Check vertical trigger pulse at pin (31) of IC801.
Normal
Check IC1500, IC1501
and related circuits
17
SX68JS10
2000 (ms)500 500
2000 (ms)500 500
2000 (ms)500 500
2000 (ms)500 500
500 500 2000 (ms)
Bus-Err
Bus-Err
PROM
2
E
(IC1001)
V/C/D
TROUBLE SHOOTING TABLE (Continued)
(IC801)
PDC
Bus-Err
(IC1500)
Bus-Err
AV-SW
(IC401)
Bus-Err
SPATIALIZER
(IC300)
Bus-Err
IGR
(IC2300)
2000 (ms)
500 500
Bus-Err
B
500 500
PLL
2000 (ms)
(TU200)
Bus-Err
DCF
500 500
(IC5400)
2000 (ms)
500 500
Bus-Err
4ch DAC
2000 (ms)
(IC1003)
Yes
Blown out
Replace the Fuse.
Check the power circuit
consisting of T700, IC700
etc.
Is the Fuse again blown out?
A
Check F700.
No
Normal
NoYes
Check IC1000,
Does 5V appear at pin (27), (18) of IC1000.
Check the
TROUBLE SHOOTING TABLE (Continued)
18
IC1002, Q1005,
Q1750 and
Q1751.
peripheral circuit
of IC1700,
IC1701, IC1750
and D1752.
C
No snow noise.
Abnormal
Check TU200(TUNER)
and its related parts.
Check pin (19) of TU200.
Check IC401 its
Check Q200, Q201, Q203
and their peripheral circuit.
Yes
peripheral circuit.
No
Check IC3801,
IC3802, IC3803
and their peripheral
circuit.
Are pin (8) of IC3801, pin (8) of
IC3802 and pin (8) of IC3803.
Check the
peripheral circuits
of screen heater
(FBT) and the CRT.
Yes
No Yes No
Check IC801 RGB
out Normal?
Yes
Check IC800,
IC802, IC803 and
their peripheral
circuit.
SX68JS10
No
Normal
TROUBLE SHOOTING TABLE (Continued)
Noise or signal
appear.
Is AV1, AV2, AV3 or
DVD input normal?
Check pin (36) of
IC401 noise or signal
appear?
C
No
NO PICTURE
Does the snow noise appear
on the picture tube at max
contrast and brishtness
control?
Check IC753, L203 etc.
Check IC750, L202, TU200
etc.
No
No
Check L201, IC751 etc.
No
Yes
No
Check pin (15) of
IC801 noise or signal
appear?
Check IC400, Q404,
Q410, Q412 and
their peripheral
circuit.
Yes
Snow noise increase.
TROUBLE SHOOTING TABLE (Continued)
Does 9V appear at pin (6) of
TU200 (TUNER).
Yes
Does 33V appear at pin (9) of
TU200.
Yes
Does 5V appear at pin (7) of
TU200.
Check TU200, Q204 etc.
19
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