Model: 21F1[21A8BN87(A)]/21F2[21B8BN87(A)] -
2102[21A9BN37(B)]/2103[2109BN37(D)]
Used ICs: KS88C8424 – MN5199K – AN5539 – AN5265 - FBSC28 (LOT) - Transistorized SMPS
TV system: RF input : PAL
BG/DK, SECAM BG/DK.
Video input : PAL/SECAM/NTSC 3.58/NTSC 4.43
Colour picture tube: 21” 25” 29” 90 degree North(1) hemisphere
Bv=+0.35G±0.2G
Method to enter into SERVICE MENU and ADJUST MENU
Turn on the Main Power Switch, then press volume buttons both "+" and "-" simultaneously for over 5 seconds, the "KWTUA SERVICE" will be displayed on the screen.
The “KWTUA SERVICE” menu is indicated with each item on the screen. The item can be selected by pressing channel “UP ” and “DN” keys.
Selecting “Read 5198”, press “MENU/OK” key (or press “OK” key on the remote handset) to read IC NN5099K/NN5198K DATA in order to operate the TV set. On-screen display will be shown.
Press “MENU/OK” key (or press “OK” key on the remote handset) to confirm Read 5198.
Press “M” key on the remote handset to exit.
Many standard data are already pre-set in the EEPROM inside IC NN5198K or NN5099K by the IC manufacturer. During manufacturing the TV set, it is necessary to read those data stored in EEPROM of IC NN5198K or NN5099K and memorize it in external EEPROM. By doing so, some alignment can be omitted, or the data memorized in the external EEPROM can be changed according to the situation. Please note that according to the specification, the operation of “reading” data from the EEPROM insideNN5198K or NN5099K only can be done 1000 times. When changing IC201 (NN5198K or NN5099K)/IC602 (EEPROM) or before adjusting, it is necessary to read NN5198K or 5099K data one time.
“CNT:X” means number of times that the data stored in the EEPROM of NN5198K or NN5099K has been read. For example, CNT:19, it means the data stored in the EEPROM of NN5198K or NN5099K has been read 19 times.
Selecting “Option”, press “OK” key then input the option code by number keys on the remote handset according to the “Option code”. After changing “OPTION”, the TV set must be set to standby and power on again, then enter into “SERVICE MENU”.
Select “Adjustment”, press “OK” key on the remote handset. The “ADJUST MENU” is indicated with each parameter on the screen. Pressing channel “UP ” and “DN ” keys can select the responding parameter. The parameter value can be changed by pressing volume “+” and “-” keys. Press “OK” key to exit.
Select “Other Adj.”, press “MENU/OK” (or press “OK” key on the remote handset), On-screen display will be shown.
Production
The function of ”Production” is for production aging purpose. When no RF signal input and if it is set to “on”, the TV set will not be blue back and standby shortly. When the TV set is finished, it must be set to “off”. If it is set to “on”, a character “P” will appear on the top of the screen when changing channel, this means that it is set for production purpose. By pressing the volume “+” and “-” keys, “Production” can be set to “off” or “on”. By pressing the “MENU/OK” in the TV set or “M” key on the remote handset, it will exit the menu.
AFT-Step
Use channel “UP ” and “DN ” keys to select the parameter, the parameter value can be changed by pressing volume “+” and “-” keys. See “AFT data setting”. Press “M” key on the remote handset or “MENU/OK” key in TV set to exit-Step” to set AFT DATA, press “OK” key to enter, On-screen display will be shown.
IPC
Selecting “IPC” to set picture mode data, press “OK” key to enter, the picture mode data is indicated with each parameter on the screen. Press “I.P.C.” key to select picture mode, select the parameter and change the parameter value. When this picture mode data is ok, press “OK” key to store, the parameter value below will display “Stored”. When all picture mode data is being stored, press “MENU” key to exit.
Circuit Diagram (Schematic)
Click on the schematic to zoom in
Adjustment of T101(31.9MHz trap) and AFC
A.Adjustment for T101(31.9MHz trap) (for using T101 models)
1. Turn on the main power switch.
2. Apply 100dBµv 31.9MHz signal between IF input pin and GND of the TUNER on main PC board.
3. Put the probe of oscilloscope to SA102 pin1 and GND.
4. Adjust T101 until the waveform in oscilloscope to minimum.
B. Adjustment of AFC
a. Preparation procedure
1. Turn on the main power switch.
2. Set digital voltmeter at DC, then connect it’s probe across of R603 and GND.
3. Apply 100dBµV IF signal between IF input pin and GND of the TUNER on main PC board.
b. Adjustment Step
Adjust the “AFT ADJ” DATA until the meter indicates 2.4±0.1V.
c. AFC Check.
After adjustment, it is necessary to confirm the DC voltage across R603 when Changing the RF output frequency of pattern generator (PM5518) by ±o.1MHz, the DC voltage should be as:
IF+0.1MHz >> 1.2±0.5V
IF-0.1MHz >> 3.3±0.5V
Remark: IF=38.0MHz
If the result is not satisfactory, repeat adjustment step "b. Adjustment Step" until correct voltage is obtained.
d. Press “OK” key to store.
e. press “MENU” key to exit.
Adjustment for H position and V position, V-height and V
linearity.
a. Receive pattern signal (PAL).
b. Enter ADJUST MENU.
1. Adjust value of HOR.POS to get a good H position picture.
2. Adjust value of VER.HEI to get a normal picture.
3. Adjust value of VER.POS to get a good V position picture.
4. Normal VER.LIN and VER.S CUR don’t need adjustment. If V linearity is not good, please adjust value of VER.LIN and VER.S CUR to get a good V linearity picture.
c. Receive pattern signal (NTSC).
d. Enter ADJUST MENU
1. Adjust value of HOR.POS60 to get a good H position picture.
2. Adjust value of VER.H60 to get a normal picture.
3. Adjust value of VER.POS60 to get a good V position picture.
4. Normal VER.LIN60 and VER.SC60 doesn’t need adjustment. If V linearity is not good, please adjust value of VER.LIN60 and VER.SC60 to get a good V linearity picture.
e. Press “OK” key to store.
f. press “MENU” key to exit.
a. Receive pattern signal (PAL).
b. Enter ADJUST MENU.
1. Adjust value of HOR.POS to get a good H position picture.
2. Adjust value of VER.HEI to get a normal picture.
3. Adjust value of VER.POS to get a good V position picture.
4. Normal VER.LIN and VER.S CUR don’t need adjustment. If V linearity is not good, please adjust value of VER.LIN and VER.S CUR to get a good V linearity picture.
c. Receive pattern signal (NTSC).
d. Enter ADJUST MENU
1. Adjust value of HOR.POS60 to get a good H position picture.
2. Adjust value of VER.H60 to get a normal picture.
3. Adjust value of VER.POS60 to get a good V position picture.
4. Normal VER.LIN60 and VER.SC60 doesn’t need adjustment. If V linearity is not good, please adjust value of VER.LIN60 and VER.SC60 to get a good V linearity picture.
e. Press “OK” key to store.
f. press “MENU” key to exit.
Adjustment for RF AGC
a. Receive RF signal (62±3dBµV).
b. Enter into ADJUST MENU.
c. Pressing channel “UP ” and “DN ” keys on the remote handset and on-screen display will be shown as following: RFAGCDP XX
d. Press volume "+" or "-" on the remote handset to change the value of RFAGCDP until snow noise on the screen just disappears.
e. Press “OK” key to store.
f. press “MENU” key to exit.
a. Receive RF signal (62±3dBµV).
b. Enter into ADJUST MENU.
c. Pressing channel “UP ” and “DN ” keys on the remote handset and on-screen display will be shown as following: RFAGCDP XX
d. Press volume "+" or "-" on the remote handset to change the value of RFAGCDP until snow noise on the screen just disappears.
e. Press “OK” key to store.
f. press “MENU” key to exit.
Adjustment for Sub-brightness
a. Receive MONOSCOPE pattern.
b. Press key “I.P.C” on the remote handset to set Brightness and Contrast at natural state.
c. Enter into ADJUST MENU.
d. Pressing channel “UP ” and “DN ” on the remote handset, the display on screen will be: SUB BRI XX
e. Press volume “+” or “-” on the remote handset to change the value of SUB BRI until eight and half of portions is just visible.
a. Receive MONOSCOPE pattern.
b. Press key “I.P.C” on the remote handset to set Brightness and Contrast at natural state.
c. Enter into ADJUST MENU.
d. Pressing channel “UP ” and “DN ” on the remote handset, the display on screen will be: SUB BRI XX
e. Press volume “+” or “-” on the remote handset to change the value of SUB BRI until eight and half of portions is just visible.
f. Press “OK” key to store.
g. press “MENU” key to exit.
g. press “MENU” key to exit.
+B Voltage check
After production aging, it is necessary to check +B voltage.
a. Receive standard colour bar signal.
b. Press key “I.P.C” to select “Natural” mode.
c. Connect digital voltmeter between JP430 (For 21A9BN37) or C403(For other models) and GND. The read-out on the voltmeter should be +B±1V. if the result is not satisfactory, adjust VR901 to make the correct voltage to be +B±1V.
After production aging, it is necessary to check +B voltage.
a. Receive standard colour bar signal.
b. Press key “I.P.C” to select “Natural” mode.
c. Connect digital voltmeter between JP430 (For 21A9BN37) or C403(For other models) and GND. The read-out on the voltmeter should be +B±1V. if the result is not satisfactory, adjust VR901 to make the correct voltage to be +B±1V.
