Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on
these models should only be performed by those who are thoroughly familiar with precautions necessary when
working on high voltage equipment.
Exercise care when servicing this chassis with power applied. Many B plus and high voltage RF terminals
are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain
interconnecting ground lead connections between chassis, escutcheon, picture tube dag and tuner when operating
chassis.
These receivers have a "polarized" AC line cord. The AC plug is designed to fit into standard AC outlets
in one direction only. The wide blade connects to the 'ground side' and the narrow blade connects to the 'hot
side' of the AC line. This assures that the TV receiver is properly grounded to the house wiring. If an extension
cord must be used, make sure it is of the 'polarized' type.
Since the chassis of this receiver is connected to one side of the AC supply during operation, service should
not be attempted by anyone not familiar with the precautions necessary when working on these types of
equipment.
When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an
Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors. The
Isolation Transformer should be connected between the TV line cord plug and the AC power outlet.
Certain HV failures can increase X-ray radiation. Receivers should not be operated with HV levels
exceeding the specified rating for their chassis type. The maximum operating HV specified for the chassis used in
these receivers is 27kV±1.0kV at zero beam current with a liner voltage of 220-240V AC. Higher voltage may
also increase the possibility of failure in the HV supply.
It is important to maintain specified values of all components in the horizontal and high voltage circuits and
anywhere else in the receiver that could cause a rise in high voltage, or operating supply voltages. No changes
should be made to the original design of the receiver.
Components shown in the shaded areas on the schematic diagram and identified by in the replacement parts
list should be replaced only with exact factory recommended replacement parts. The use of unauthorized
substitute parts man creates may create shock, fire, X-ray radiation, or other hazards.
To determine the presence of high voltage, use accurate high impedance HV meter connected between the
second anode lead and the CRT dag grounding device. When servicing the High Voltage System remove static
charges from it by connecting a 10K Ohm resistor in series with an insulated wire (such as test probe) between the
picture tube dag and 2nd anode lead (Have AC line cord disconnected from AC supply).
The picture tube used in this receiver employ integral implosion protection. Replace with a tube of the same
type number for continued safety. Do not lift picture tube by the neck. Handle the picture tube only when wearing
shatterproof goggles and after discharging the high voltage completely. Keep others without shatter proof
goggles away.
Before returning the receiver to the user, perform the following safety checks:
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the
chassis and other metal parts in the receiver.
2. Replace all protective devices such as non-metallic control knobs, insulating fishpaper, cabinet backs,
adjustment and compartment covers of shields, isolation resistor-capacitor networks, mechanical insulators etc.
3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made at
each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw heads knobs and/or
shafts, escutcheon, etc.) in the following manner.
Plug the AC line cord directly into a 220-240V, AC receptacle. (Do not use an Isolation Transformer during
these checks.) All checks must be repeated with the AC line cord plug connection reversed. (If necessary, a
nonpolarized adapter plug must be used only for the purpose of completing these checks.)
If available, measure current using an accurate leakage current tester. Any reading of 0.35mA or more is
excessive and indicates a potential shock hazard, which must be corrected before returning the receiver to the
owner.
If a reliable leakage current tester is not available, this alternate method of measurement should be used.
Using two clip leads, connect a 1500 Ohm, 10 Watt resistor paralleled by a 0.15MF capacitor in series with a
known earth ground, such as a water pipe or conduit and the metal part to be checked. Use a VTVM or VOM with
1000 Ohms per Volt, or higher, sensitivity to measure this AC voltage drop across the resistor. Any reading of
0.35 Volt RMS of more is excessive and indicates potential shock hazard which must be corrected before
returning the receiver to the owner.
3
Page 4
ALIGNMENT PROCEDURES
PLEASE READ BEFORE ATTEMPTING SERVICE
1. Use an Isolation Transformer when performing any service on this chassis.
2. Never disconnect any leads while receiver is in operation.
3. Disconnect all power before attempting any repairs.
4. Do not short any position of the circuit while the power is on.
5. For safety reasons, replace components any with identical replacement parts (SEE PARTS LIST).
6. Before alignment, warm up the TV for at least 30 minutes and demagnetize the CRT with an external
degaussing coil.
7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back
in its original position.
8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only specified
silicon grease. Remove all old silicon when applying new silicon.
9. Before removing the anode cap, discharge electricity because it contains high voltage.
Service Flow Chart
Power supply
check input voltage ―→ check voltage of C910 anode ―→ check Pin 4 of N901(17v)―→ check
N901 ―→ check output voltage of T901 secondary coil ―→check voltage of N931,N933 Pin 3(5.0v) and
N932 Pin3 (9.0V) ―→check voltage of N103 Pin 3,15,45(5v) and Pin25,54 (3.3v)
Audio circuit
check power supply of audio power amplify circuit(21V) ―→ check input audio signal of audio power
amplify circuit ―→ check waveform of XS203 Pin1
Horizontal circuit
Check voltage of C960 anode 108V―→ check waveform of V401 Base ―→ check waveform of V402
Collector ―→ check output voltage of T402 coil ―→ check waveform of T402 Pin 8
Vertical circuit:
check voltage of C963 anode +12V ,C964 anode –12V→ check waveform of N103 Pin 34 Pin35 ―→
check waveform of N440 Pin 1 Pin7 ―→ check waveform of N440 Pin 5
UOC circuit:
check voltage of N103 Pin 7 (5v) and Pin32 (0v) ―→ check Pin6 (5v)―→ check waveform of N103
Pin31
ADJUSTMENT MANUAL
Test Notices
1. Please follow the pointed test steps and choose the right test equipment
to conduct adjustment, otherwise good effect of the unit could not be
obtained. Pointed bias voltage value should be ensured during test to get
satisfied test result.
2. To adjust the chassis, before installing, you should write mother chip’s
data into the memory N104 that being installed into this chassis and no any
data except this test manual listed are promised to be modified without
designer’s agreement.
3. Let the unit warm up at least 30 minutes and demagnetize the CRT and cabinet
2 Apply 8V stable power supply to N931(7805) and N933(7805)input point. Apply
12V stable power supply to N932(7809) input point.
3 Adjust RP121 to the middle position, then swap TV system to PAL D/K with remote
control, connect PH5820 to IF input (R101 and C101 joint) and apply 95dB 38.9MHz
PAL D/K signal.
4 Connect oscilloscope or digital voltmeter anode to Pin8 of N103, and cathode
to GND, adjust IFT T101 with non-inductive rod until the measured point level
reading on the voltmeter is 1.60±0.05V.(Core inside IFT)
5. Reconnect IF end of RF tuner after adjustment.
HF AGC adjustment
1 Receive signal (U channel)
2 Set input field strength to 60dBμV (PAL D/K)gray scale signal.
3Adjust RP120 until C119 anode is just 4.0V±0.1V。
Factory menu
1. Press MENU button to display the main menu, then press RECALL button five
times continuously to enter factory mode. Press 0 button, then RECALL button
to exit factory mode.
2. After entering factory mode:
Press 1 button to adjust Horizontal:including H-BLANK(HBS0、HBST),
H-POSITION(HPOS), H-SIZE(H-P0)、 H TRAPEZIUM(H-P1)、 H PINCUSION(H-P2),
H S-CORRECTION(H-P3)、 H E-W CORNER CORRECTION(H-P4)。
Press 2 button to adjust Vertical:including V PHASE(OFS)、 HEIGHT(V-P1)、
V SYMMETRY(V-P2)、V LINEARITY(V-P3),Angle、Bow adjustment are also Vertical
adjustment.
Angle adjustment: no upper adjustment, just switch the lower right and left
to adjust.
Bow adjustment: no upper adjustment, just switch the lower right and left
to adjust.
Press 3 button:Select some functions
Press 4 button:Check DRIVE REF.
Press 5 button:Enter into G2 mode.(This mode is for grid test)
Press 6 button:Check CUTOFF.
Press 7 button:Select some functions
Press 8 button: Brightness/ Contrast/Color parameters setting.
5
Page 6
Press 9 button:Memory data.
3.Press PROG.△/PROG.▽ to select test item, and VOL+/- button to adjust the
value, then press RECALL button to confirm and store.
Geometry Distortion adjustment
Adjust Geometry Distortion under factory mode with remote control including:
V PHASE, V SYMMETRY, V LINEARITY, H PHASE, H SIZE, H PINCUSHION, etc. RECALL
must be pressed after every step finishing to store, and the adjustment must
be done according to the following order.
Use 50Hz Circle Test Card with CENTER CROSS pattern as test signal, then use
remote control to enter factory mode.
1) Press 1 button to adjust Hor Blanking Stop/Start until H Blank is just
out the screen.
2)Vertical Phase adjustment: Press 2 button to adjust VERT Position value
until V-center and the screen’s geometric center is in accordance.
3)V AMPLITUDE adjustment: Select Vert Amplitude item to adjust the vertical
amplitude until it is at an appropriate position.
4)adjustment, select S-Correction item and adjust it to make the upper and
lower picture symmetrical.
5)V-Linearity adjustment: Select Vert S-Symmtry item, adjust the value to
make the vertical distance from upper edge to middle pattern is equal
to the vertical distance from lower edge to middle pattern.
6)Press 1 button to adjust horizontal center: Adjust Hor Position item until
pattern V-center and the screen’s geometric center is in accordance.
7) Select AV mode and use 60Hz Circle Test Card with CENTER CROSS pattern
as test signal, then use remote control to enter factory mode and select
vertical distortion menu. Adjust 60Hz Geometry Distortion according to
steps 1~6.
Repeat steps from 1) to7) until the right value is obtained.
Functions for this unit (Select different functions for different models)
Enter into factory mode, then press 3 button to select and adjust as the
following:
White Line: Yes(It should be closed in white balance adjustment)
Press button -/--,select and adjust according to the following order:
6
Page 7
RemoteMode:KK-DVD
Ycbcr(AV): Yes
Cvbs2: No
SVHS: No
Side AV: Yes
SCART(RGB):Yes
Grid/Focus adjustment
1. Set condition is AV mode without signal and enter into factory menu, press
5 button to adjust the brightest color line of R, G and B just appears on
the screen. Exit the factory menu.
2. Select CROSSHATCH and DOT signal, then set PICTURE to STANDARD mode.
3. Adjust FOCUS to make the picture on the CRT is the clearest.
Sub Brightness adjustment
Select black and white five circles pattern, set PICTURE to standard
mode. Enter into factory menu, then press 8 button to adjust Bright Mid
until 8~8.5 gray scale of 10 gray scale appears on the screen. (Recommend
value is 25~35). Exit factory menu.
White balance adjustment
1 Apply “left black right white” signal for white balance adjustment.
2 Enter into factory menu with remote control, press EQU button to display
CCU OFF character.
3 Insert I2C BUS controller plug that is used for automatic adjustment system
into XS600 socket on the main board.
4 Run the program.
5 Press SPACE key or press switch on the controller socket, white balance
adjustment will be operated automatically. There have three color
temperature for you to adjust, if OK, “Click” will be heard.
6 Unplug I2C controller after adjustment finishing, then press CLOCK button
on the remote control to restore CCU ON.
Standard:Color temperature 9300K (X=0.284 Y=0.299)
Cold color:Color temperature 12000K(X=0.272 Y=0.279)
Warm color:Color temperature 6500K (X=0.313 Y=0.329)