Quadro CTV-37D10 TXT User manual

MODELS: CTV-37D10 TXT
CTV-55N11 TXT
CTV-55D10 TXT
CTV-55X10 TXT MkI
I
CTV-55V20 TXT
CTV-55Z10 TXT
MkII
MkIII
SERVICE MANUAL
Brown goods
TV SETS 14", 21" 3P51 chasis

Safety Notice
-2-
SAFETY PRECAUTIONS
1:An isolation transformer should be connected in the power line between the receiver and
the ACline when a service is performed on the primary of the converter transformer of the
set.
2:Comply with all caution and safety-related notes provided on the cabinet back, inside the
cabinet, on the chassis or the picture tube.
3:When replacing a chassis in the cabinet, always be certain that all the protective devices
are installed properly,such as,control knobs, adjustment covers or shields, barriers,isola-
tion resistor-capacitor networks etc.. Before returning any television to the customer,the
service technician must be sure that it is completely safe to operate without dangerof
electrical shock.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in television receiver is the picture tube. The picture
tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION
protection, the replacement tube must be the same type as the original including suffix
letter. Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid
such hazards, the high voltage must be maintained within specified limit. Refer to this
service manual, high voltage adjustment for specific high voltage limit. If high voltage exce-
eds specfied limits, take necessary corrective action. Carefully follow the instructions for
+B1 volt power supply adjustment, and high voltage check to maintain the high voltage
within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made inany area
of a receiver. Components indicated by mark in the parts list and the schematic diagram
designate components in which safety can be of special significance. It is particularly
recommended that only parts designated on the parts list in this
manual be used for com-
ponent replacement designated by mark . No deviations fromresistance
wattage or vol-
tage ratings may be made for replacement items designated by mark .
!
!
!
Contents
Safety Notice-------------------------------------------------------------------------2
Chassis Block Diagram-------------------------------------------------------------
IC Block Diagram --------------------------------------------------------------------5-8
-
12
PCB Top/Bottom layer -------------------------------------------------------------
Service Adjustments ----------------------------------------------------------------
Purity and Convergence Adjustment---------------------------------------------
Control Location ---------------------------------------------------------------------
Input and Output Terminals---------------------------------------------------------
Operation Instructions--------------------------------------------------------------
Mechanical Disassemblies---------------------------------------------------------
Circuit Diagram-----------------------------------------------------------------------
1-
26
2
2
2
-3
3
Technical specification--------------------------------------------------------------3
4
9
10-
322
3
4
5
3
4
35
TRANSISTOR MARK --------------------------------------------------------------

-3-
SPECIFICATIONS
Design and specifications are subject to change without prior notice.
Receiving System : BG / DK / I / M
Colour System : PAL / SECAM / NTSC
Picture Tube : 54cm (21") diagonal
Ext. Antenna : 75 Ohm Coaxial Cable
Ext. In/Out : Audio/video -in/out
Speaker : 8 Ohm(5W) x2
Audio Output(MAX) : 1KHZ 0.5Vrms, 5Wx2
10% THD Audio Output Power : 1KHZ 0.5Vrms, 5Wx2
Power Consumption : AC 110-240V 50Hz, 80W MAX
Dimension : 524(W) x 495(D) x 463(H)mm
Net Weight : 22 kg
REMOTE CONTROL
Transmitting System : Infrared
Power Supply : DC 3V (1.5 x 2)
Dimension : 28(W) x 155(L) x 45(D)mm
Net Weight : 83 g

Chassis Block Diagram
/
63
62
15
5
14
AV2R AV 2 L AV 1 R
AV 1 L
A B
9
10 12
3
1
AUDIO OUT
4052
AUDIO SWITCH
TDA7056A
35023
xx
0
(stereo)
(mono)
BF422/BF423
4

-5-
IC BLOCK DIAGRAM
IC 101 TFA9842AJ(2Channel AudioAmplifier)

-6-
IC 401 (Vertical Deflection Booster) STV9302A
IC BLOCK DIAGRAM
IC 601 (Power Switch) F SCQ0765RT

-7-
1
INPUT
2
OUTPUT
SERIES
PASS
ELEMENT
SOA
PROTECTION
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
THERRMAL
PROTECTION
STARTING
CIRCUIT
CURRENT
GENERATOR
REFERENCE
VOLTAGE
3
GND
IC 652 (Regulators) L7808Series
1
23
4
1:ANODE
2:CATHODE
3:EMITTER
4:COLLECTOR
IC 602 (Photo Transistor ) TLP421
IC BLOCK DIAGRAM
TLP421

-8-
IC 701 ( TDA9381TV Signal Processor)
IC BLOCK DIAGRAM

2DD2499
C1815
A1015
PNP
NPN
L7805
INPUT
GND
OUTPUT
INPUT
L7808
INPUT
GNDOUTPUT
C2482
CB
E
NPN
-9-
CB
E
A966
PNP
TRANSISTOR MARK
NPN
CB
E
CB
E
C2120
NPN
CB
E
C2717
NPN
C
BE
BCE
BF421
PNP
CB
E
BF421
PNP
CB
E
BF422
NPN
CB
E
BF423
PNP
CB
E

MAIN PCB Top Layer
-10-

MAIN PCB BOTTOM Layer
11--

SIDE AV PCB TOP LAYER
CRT,SIDE AV&CONTROL PCB TOP LAYER
CRT PCB LAYER
1
--
2
CONTROL PCB TOP LAYER

Service Adjustments
3
--
1
""

ServiceAdjustments
-14-
3P51 ADJUST MENU
1.FACTORY MODE:
(1)Assembly line adjust mode: Press S.M., (DISPLAY) and keys in turn to enter
this mode.
(2)Engineer adjust mode: Press CLOCK, P.M. and keys in turn to enter this mode. This
mode is usually for R&D and engineering department use.
(3)Press digital keys to enter every adjust page, use PROG+/- keys to pick adjust items, use
VOL+/- keys to adjust the value.
(4)Press DISPLAY to quit factory mode.
2.B+ VOLTAGE ADJUST
Measure C600A + voltage, adjust VR641 to get proper B+ voltage according to CRT
assembly list requirement.
3. RFAGC VOLTAGE ADJUST
(1)Receive 294.25MHz,60dBcolor bar signal.
(2)Enter factory mode and press digital key “4”.
(3)Measure tuner AGC point voltage, adjust AGC item till the voltage is 2.4V,or till picture
noise just disappears。Usually the AGC value is fixed to 27.
4、FINE ADJUST：
(1) FOCUS ADJUST
a. Receive cross-hatch pattern signal。
b. Set picture to“RICH” mode。
c. Adjust FBT’s FOCUS knob till picture is clear。
(2) SCREEN VOLTAGE ADJUST(KEY 0 )：
a. Set picture to“STANDARD”mode，without signal input;
b. Enter factory mode and press digital key”0”
c. Adjust FBT’s SCREEN knob till VG2 voltage flag changes between “LOW” and
“HIGH”，press PROG+ key to enter other menu。
(3) HORIZON ADJUST(KEY 1 ):
a. Receive 50HZ monoscope PATTERN. Set TV to standard mode. Press KEY1 to enter
factory mode
b. Adjust 5HSH(for 60Hz picture,its is 6HSH)to set picture horizontal center to CRT
horizontal center.
c. Receive 60HZ monoscope PATTERN, repeat above b item

ServiceAdjustments
-15-
(4)VERTICAL&YUV/RGB HORIZON ADJUST(KEY2 ):
5VSL 50HZ vertical linearity 5SCL 50Hz vertical slope correction
5VSH 50Hz vertical center 5VAM 50Hz vertical size
6VSL 60HZ vertical linearity 6SCL 60HZ vertical slope correction
6VSH 60HZ vertical center 6VAM 60HZ vertical size
a. Receive 50Hz cross hatch signal, set TV to STANDARD mode, press digital key “2”
after enter factory mode, adjust 5VSL so that picture’s vertical line is just at the
bottom of the half picture.
b. Adjust 5VSH to set picture vertical center to CRT center.
c. Adjust 5SCL to set proper vertical linearity
d. Adjust 5VAM to obtain picture’s vertical re-display ratio more than 90% .
e. If necessary, fine adjust above items.
f. Receive 50HZ RGB or YUV cross hatch signal,set TV to STANDARD mode,adjust
5RGH till picture horizontal center is at the CRT center.(OPTION)
g.
h. Receive 60Hz cross hatch signal, repeat above a,b.
f.Receive 60HZ RGB or YUV cross hatch signal,repeat above items.(OPTION)
(5) OSD POSITION:
4-6-1 Menu OSD position adjustment: Receive 50/60HZ cross hatch pattern. Set
TV standard status. Press KEY 2 in factory mode, adjust 5VOF/6VOF and
HOF item, to obtain menu OSD at the center of CRT screen;
4-6-2 LOGO position adjustment: Receive 50/60HZ cross hatch pattern. Set TV
standard status. Press KEY 7 in factory mode, adjust XMIN,XMAX,YMIN,
and YMAX item, to obtain LOGO at the center upto 1/3 of CRT screen.
4-6-3 TELETEXT OSD position adjustment: Receive 50/60HZ TELETEXT signal.
Set TV standard status. Press KEY 7 in factory mode, adjust TXMI and
5TYM/6TYM item, to obtain INDEX at the center of CRT screen.
4-2 White Balance Adjustment (Applied in factory)（KEY 3 ）
Normally, this chassis can auto adjust white balance, but for some CRT need to adjust
white balance carefully by hand，Set BRIGHTNESS and CONTRAST at normal status ,
receive GREY SCAL and entering factory mode press KEY 3, set WPR at 31, adjust WPG
and WPR to obtain white balance.
4-3 RF.AGC ADJUSTMENT(KEY 4 )
4-3-1 Receive 60dB RF signal. Connect Digital voltmeter positive terminal to
tuner AGC terminal and negative terminal to GND.
4-3-2 Enter the AGC item in factory mode by the REMOTE CONTROL.
Method：Press key S.M., , in turn to enter factory mode, then

ServiceAdjustments
-16-
press key “4” and select AGC item by PROG+/-.
4-3-3 Adjust “VOL+” and “VOL-“ keys to obtain 2.4V Digital voltage meter
reading or just no NOISE on screen。
Press key “ ” to exit factory mode！。
5、E2PROM INITIALIZTION
(1) E2PROM initialization (KEY 8 )：
We can use an empty E2PROM when making the sample TV or repairing,also can use
the E2PROM which has been full of data,but you must follow the steps below to
initialize the E2PROM.
Press the keys CLOCK , P.M., in turn to enter the factory mode。Press KEY
8,VOL +/- in turn,you may see the OSD”BUSY” after the“INIT”on the
screen。About a while, the character“BUSY”will disappear，then POWER OFF
and ON the TV,the initialization is completed。
(2) FUNCTION SETTING (KEY 5 )
Press the keys “CLOCK” , “P.M.”, “ ” in turn to enter the factory mode。Press KEY 5 to
enter the setting menu。
b.Set values to OPTION 1- OPTION 7
c.LOGO setting when powered on or no signal：Press key CLOCK in factory menu
to enter the LOGO edit mode，there are two rows，the 1st can set the
customer’s name etc，and the 2nd row can set to display the customer’s
e-mail, phone…。Press the keys “PROG +/- ”to select the character to
edit，use keys “VOL+/-” to choose the charater.
The detailed instruction of 3P51
Some items displayed but not mentioned below is not used in 3P51 chassis.
.Item Storage
address Display string Range (Index | value) Default value
Information of the factory menu RELEASE2.0; Software Version Fixed, not
changeable
Drect key “8”
initialize 1
Initialization INIT uninitialize 0 0
Instruction
Press key “VOL +”，you can see the character ”INIT BUSY” is
active，Exit the menu and turn off the TV after the character
disappearing，reopen it can have a success to innitialize。Then
the program has been storaged in the memorizer，and then need
to readjust the parameter of the factory menu。

ServiceAdjustments
-17-
.Item Storage
address Display string Range (Index | value) Default value
Drect key “0”
Screen Voltage A level bright line
Instruction Adjust the screen voltage under Tv standard mode and no signal
input，just can see the line is ok。
Drect key “1”
Horizontal paralellogram 50Hz 29 5PAR 0-63 31
Horizontal bow 50Hz 2A 5BOW 0-63 31
Instruction The above value be adjusted±10 can be OK,the default value is31
Horizontal shift 50Hz 2B 5HSH 0-63 19
EW width 50Hz 2C 5EWW 0-63 33
EW parabola/width 50Hz 2D 5EWP 0-63 19
EW upper corner parabola 50Hz 2E 5UCR 0-63 33
EW lower corner parabola 50Hz 2F 5LCR 0-63 18
EW trapezium 50Hz 30 5EWT 0-63 43
Horizontal paralellogram 60Hz 37 6PAR 0-63 31
Horizontal bow 60Hz 38 6BOW 0-63 31
Horizontal shift 60Hz 39 6HSH 0-63 31
Instruction The above value be adjusted±10 can be OK,the default value is31
EW width 60Hz 3A 6EWW 0-63 33
EW parabola/width 60Hz 3B 6EWP 0-63 19
EW upper corner parabola 60Hz 3C 6UCR 0-63 44
EW lower corner parabola 60Hz 3D 6LCR 0-63 10
EW trapezium 60Hz 3E 6EWT 0-63 44
Drect key “2”
Vertical slope 50Hz 31 5VSL 0-63 31
Vertical amplitude 50Hz 32 5VAM 0-63 10
S-correction 50Hz 33 5SCL 0-63 31
Instruction generally ,SCL can be setted to be31。
Vertical shift 50Hz 34 5VSH 0-63 22
Horizontal shift 50Hz on RGB mode 35 5RGH 0-63 38
OSD vertical position offset 50Hz 36 5VOF 0-63 38
Instruction Horizontal shift on RGB mode generally between 30 to 42，the
direct way is to connect the two Tv’s SCART。Adjust the Value
Vertical slope 60Hz 3F 6VSL 0-63 31
Vertical amplitude 60Hz 40 6VAM 0-63 11
S-correction 60Hz 41 6SCL 0-63 31
Vertical shift 60Hz 42 6VSH 0-63 23
Horizontal shift 60Hz on RGB mode 43 6RGH 0-63 38
OSD vertical position offset 60Hz 44 6VOF 0-63 31
OSD horizontal position offset 45 HOF 0-63 42

ServiceAdjustments
-18-
.Item Storage
address Display string Range (Index | value) Default value
Vertical zoom 46 VX 0-63 32
Instruction Adjust this item when lack of vertical amplitude will lead to the
picture can’t be full of the screen,then need to adjust the
resistance’s(R318,R319) value.
Direct Key “3”
Black level off-set R RED 0-63 32
Black level off-set G GRN 0-63 32
White point R (Direct Key “Red”) WPR 0-63 31
White point G (Direct Ke“Green”) WPG 0-63 31
White point B (Direct Key “Blue”) WPB 0-63 45
Instruction
The white balance can be adjusted automatically on this
machine，only one or two tube need to be adjusted，generally
the value of RED and GRN between 23 to 39,if adjust
excessively will lead the picture faded。（Remark：because of
the higher colour temperature，it’s normal that you feel a little
red。）
Luminance delay time PAL YDFP 0-15 8
Instruction This item has the function to adjust the luminance and colour
delay,change the NO. on P card,make the boundary of central
green and purple accord with the border of above gray pane.
Y delay time NTSC YDFN 0-15 8
Y delay time SECAM YDFS 0-15 8
Y delay time AV YDAV 0-15 8
Teletext contrast TTBR 0-15 15
Mute delay time while switch
program MUTD 0-20 13
Instruction
Direct Key “4”
AGC take-over AGC 0-63 27
UOC Volume VOL 0-63 56
Instruction Input standard RF signal with 1KHz sound ,measure UOC
amplitude(location is W101) of output audio RMS value,adjust
VOL till it reaches to 0.5Vrms.
SUB HUE control SHUE 0-63 35
38.9MHz 2
IF frequency IFFS 38.0MHz 3 2
Cathode drive level HDOL 0-15 2

ServiceAdjustments
-19-
.Item Storage
address Display string Range (Index | value) Default value
Instruction
Adjust "HDOL" can change the voltage of “R.G.B”obviously,but
adjust too high may lead to fade badly,reverse maybe lead to lack
of luminance,so should be careful。Generally it's ok when there is
no black screen or picture faded change the channel under the
maximal beam current
0.7X 0
Normal 1
3X 2
IF AGC speed SPD
6X 3
1
VG2 Brightness VG2B 0-63 31
TELETEXT brightness control TRBI 0-63 25
Direct Key “6”
Contrast –Min pre-set 1CON 0-100 10
Brightness –Min pre-set 1BRI 0-100 10
Colour –Min pre-set 1COL 0-100 0
Sharpness –Min pre-set 1SHP 0-100 0
Contrast –Middle pre-set 2CON 0-100 60
Brightness – Middle pre-set 2BRI 0-100 40
Colour – Middle pre-set 2COL 0-100 45
Sharpness – Middle pre-set 65 2SHP 0-100 60
Contrast – Rich pre-set 66 3CON 0-100 100
Brightness – Rich pre-set 67 3BRI 0-100 100
Colour – Rich pre-set 68 3COL 0-100 100
Sharpness – Rich pre-set 69 3SHP 0-100 100
VL05 40
VL20 65
VL40 83
VL60 88
Volume inflexion Pre-set
VL80 95
Instruction
If VOL05 set to 40,it means when VOLUME is set to 05 by
user,the internal Volume is 40.This function is used to adjust
speaker sound level-VOLUME OSD curve
opening time control RGBL 0-25 8
Direct Key “7”
Screen saver / Logo Left position 6A XMIN 0-255 44
Screen saver Right position 6B XMAX 0-255 186
Screen saver Top position 6C YMIN 0-63 4
Screen saver Bottom position 6D YMAX 0-63 37
Teletext Horizontal position 6E TXMI 0-255 40