PROGRAMME...............................MAX.99 PROGRAM MEMORIES
PICTURE TUBE
SOUND OUTPUT
AV JACKS
....................................................................AV SCART & SIDE RCA
CAUTION:
Before servicing the chassis, read the “Safely Precaution”. “X -Ray radiation Precaution” and “Product Safety Notice” in this manual.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To Avoid such hazards the high voltage must be specified limit. The
normal value of the high voltage of this receiver is 28” 27KV 29” 30KV +/-500V under 230V AC power source. The high voltage must not exceed
32KV.
2. Each time a receiver requires servicing the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is
recommended the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage
meter.
3. The primary source of X -RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube
must be exactly the same type tube as used in this TV receiver.
4. Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement
should be undertaken only after referring the PRODUCT SAFETY NOTICE below.
Service should not be attempted by anyone unfamiliar with the necessary Precautions on this receiver.
The following are the necessary precautions to be observed before servicing this chassis.
1. Since the power supply circuit of this receiver is directly connected to the AC power line. An isolation transformer should be used during any dynamic
service to avoid possible shock hazard.
2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if
broken, glass fragments will be violently expelled. Use shatterproof goggles and keep picture tube away from the unprotected body while handling.
3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as: nonmetallic control; knobs,
insulating covers, shields, isolation resistor-capacitor, network, etc.
4. When replacing parts or circuit boards, disconnect the power cord.
5. When replacing a high voltage resistor (metal oxide resistor) on circuit board, keep the resistor APP. 10mm(1/2 in.) away from circuit board.
6. Connection wires must be kept away from components with high voltage or high temperature.
7. If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
8. The receiver is designed to operate with 230V(50Hz) AC mains.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics are often passed unnoticed by a visual inspection and
the X-RAY RADIATON protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage. The use
of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, X-RAY RADIATION
or other hazards.
STF 72-1002/7 Text, ST 70-1002/7 Text
Page 9
GENERAL ADJUSTMENT
1
5
9
-/- -
678
ⅠⅡ/
234
AUTOMATIC DEGAUSSING
An automatic degaussing coil is attached around the picture tube, degaussing the tube properly in about one second after the set is switched on. If the
receiver is moved or faced on a different direction, the power must be switched off at least 15 minutes in order that the automatic degaussing circuit
operated properly. External degaussing is necessary if the automatic degassing proves ineffective after the set is moved.
B+ ADJUSTMENT
CAUTION:
To avoid X-ray hazards and result in a nominal display width, B+ voltage must be set in the scale of 28” 140V±0.5V 29” 130V±0.5V.
1. Make sure the AC power supply is 230V, 50Hz.
2. Switch on the TV receiver, tune in an active channel.
3. Measure the voltage between C641 on Main P.C. Board by DC voltmeter.
4. Set contrast, brightness, color to maximum.
5. Adjust VR631 on Main P.C. Board for B+ 28” 140V±0.5V 29” 130V±0.5V voltage reading.
HIGH VOLTAGE CHECK
CAUTION:
There is no high voltage adjustment in this chassis, B+ voltage directly relates to the high voltage. The high voltage does not exceed 28” 27KV±500V
29”30KV±500V under any conditions.
1. Connect an accurate high voltage meter to the second anode cap of the picture tube.
2. Turn on the receiver, set brightness and contrast to minimum (Zero beam current).
3. Make sure the high voltage does not exceed 30KV±500V.
4. NO matter whether the luminance, contrast and chrominance controls are set to maximum or minimum, the high voltage must be kept under
30KV±500V.
FOCUSING
Receive a TV test pattern signal; adjust focus knob to get optimum picture, a well-defined, sharpest display in the center area of the screen.
ADJUSTMENT AND SERVICING THE CHASSIS
SERVICE MODE
To enter the service mode, a special remote control which contains an additional SERVICE key must be used. See the illustration. Press the ‘SERVICE’
key on remote control, TV will display service menu as following table 1 line by line. To select the item by using the ‘P+/P-’ keys. To adjust the value of
selected parameter by using the ‘V+/V-’ keys. To quit the service mode, press the ‘P.P.’ key on remote control when in the service mode.
Table 1
ParameterValue
Red gain
DC red
Green gain
DC green
Blue gain
DC blue
Apr threshold
Logo
Red Cutoff
Green Cutoff
32
063
32
063
32
063
12
6
31
31
To enter the table 2, press the ‘OK’ key on the remote control
for the first time when in the service mode.
Table 2
ParameterValue
Tuner AGC
H POS 50
VPOS 50
VAMP 50
VLIN 50
H POS 60
VPOS 60
VAMP 60
VLIN 60
Bright max
Bright min
Sub tint
VCO coarse
VCO fine
VCO coarse L1
VCO fine L1
22
32
8
47
31
32
10
53
31
63
00
32
05
063
05
080
STF 72-1002/7 Text, ST 70-1002/7 Text
Page 10
To enter the table 3, press the ‘OK’ key for the second time on the remote control when in the service mode.
Table 3
ParameterValue
AGC gain
Option 1
Option 2
Option 3
Option 4
Option 5
ST Ttext
H POS OSD
V POS OSD
H POS TXT
V POS TXT
Hotel Mode
Volume Limit
Snd ST1
Snd ST2
Following are item description of OPTION in more details.
OPTION1
b7 = Over modulation (0=Disable, 1=Enable, it’s suggested to set it to 0 normally.)
b5 = P/N/S crystals application (0=2 Crystals, 1= 1 Crystals, according the quantity of cristal used for color decoding in chassis.)
b4 = Cutoff Loop (0= OFF, 1=ON, it’s suggested to set it to 1 normally)
b3 = Safety_Reset(0=Active, 1=Non, it’s suggested to set it to 0 normally)
b2 = MONO IN(0 = OFF , 1= ON, Depend on the sound decoding solution used in chassis. )
b1 = Sound Demodulation ( 0 = Intercarrier/MONO, 1 =QSS/NICAM, depend on the sound decoding solution used in chassis.)
b0 = logo display(0 =OFF, 1= ON, it’s suggested to set it to 0 normally.)
00
54
00
134
027
00
00
001
01
067
04
OFF
10
79
79
OPTION2 (set to 0 by default)
b5 = HALF_CONTRAST(0 = OFF, 1=ON)
b4 = Color 6dB (0 = OFF , 1 = ON )
b3 = APR Feature (0 = ON , 1= OFF )
b2 = Black Strech (0 = ON , 1= OFF )
b1 = Auto Flesh (0 = ON , 1= OFF )
b0 = Coring ( 0 = ON , 1 = OFF )
OPTION3
b7 =SMART (0 = OFF, 1=ON, it’s suggested to set it to 1 normally)
b5 = AVL (0 = OFF, 1=ON, it’s suggested to set it to 0 normally.)
b4 = PIF overmodulation (0 = OFF, 1= ON, it’s suggested to set it to 0 normally.)
b3 = Market_France - secam LL ( 0 = OFF, 1 = ON, depend on the solution of chassis.)
b2 = Manual/Auto cutoff ( 0 = Manual, 1 = Auto cutoff, depend on the CRT for chassis. )
b1 = Mute pin low/high –to contol the mute of speaker( 0 = low, 1 = high, depend on the solution of chassis.)
OPTION4
b6 = WIDE MODE ( 0 = OFF,1=ON, it’s suggested to set it to 0 normally.)
b4 = SCART2 ( 0 = OFF,1=ON, depend on the solution of chassis.)
b3 = RGB ( 0 = OFF, 1= ON, depend on the solution of chassis.)
b2 = SVHS ( 0 = OFF, 1= ON, depend on the solution of chassis.)
b1 = AV2 ( 0 = OFF, 1= ON, depend on the solution of chassis.)
b0 = AV1 ( 0 = OFF, 1= ON, depend on the solution of chassis.)
OPTION5
There are 8 bits used in OPTION 5. They are b0, b1, b2, b3, b4, b5, b6 and b7.
For b0, normally, ST suggests to set it to 0.
For b1, b2, they are used to select teletext languages.
For b3, it’s used to enable AV3 and SVHS. When b3 is set to 0, SVHS is enabled. When b3 is set to 1 in binary, the value is 8 in decimal. AV3 is en
abled.
For b4, b5, b6 and b7 of OPTION 5 are also used to set the brightness of background in teletext mode. When b4 b5 b6 and b7 are all set to 0, the
brightness of teletext background is the same as brightness of TV background. When b4, b5, b6 and b7 are all set to 1, it’s the maximum brightness of
teletext background. It’s the minimum brightness of teletext background when b4 is set to 1, and b5, b6 and b7 are all set to 0. you can set these 4 bits
according to your favorite brightness of teletext background.
-
A. For 11 OSD languages ST92195C7B1/MXX for east Europe, the setting of the b1 and b2 is listed as below.
1. If b1 = b2 = 0, then the TEXT languages like “ENGLISH, FRENCH, SWEDISH, CZECH, GERMAN, PORTUGUESE (SPANISH), ITALIAN, RUMANIAN”
can be decoded;
2. If b1=1, b2=0, then the TEXT languages like ENGLISH, RUSSIAN (BULGARIAN), HUNGARIAN, TURKISH, GERMAN, PORTUGUESE (SPANISH),
ITALIAN, RUMANIAN” can be decoded.
3. If b1=0, b2=1, then the TEXT languages like POLISH, RUSSIAN (BULGARIAN), SWEDISH, SLOVAK, GERMAN, SLOVENIAN, LITHUANIAN,
RUMANIAN” can be decoded.
4. If b1 = b2 =1, then the TEXT languages like POLISH, RUSSIAN (BULGARIAN), SWEDISH, CZECH, GERMAN, CROATIAN, LETTISH, RUMANIAN”
can be decoded.
STF 72-1002/7 Text, ST 70-1002/7 Text
Page 11
C. For 12 OSD languages ST92195C7B1/MXX for western Europe, the setting of the b1 and b2 is as below.
1. If b1 = b2 = 0, then the TEXT languages like “ENGLISH, FRENCH, FINNISH, CZECH, GERMAN, PORTUGUESE (SPANISH), ITALIAN, GREEK”
can be decoded;
2. If b1=1, b2=0, then the TEXT languages like ENGLISH, FRENCH, DANISH, NORWEGIAN, GERMAN, PORTUGUESE (SPANISH), ITALIAN, GREEK”
can be decoded.
3. If b1=0, b2=1, then the TEXT languages like POLISH, FRENCH, SWEDISH, CZECH, HOLLAND, SERBIAN, ITALIAN, RUMANIAN can be deco
ded.
4. If b1 = b2 =1, then the TEXT languages like POLISH, FRENCH, SWEDISH, CZECH, GERMAN, PORTUGUESE (SPANISH), LETTISH, RUMANIAN”
can be decoded.
ST Ttext - only for ST engineer
b0 = enable ST to change the process for adjusting Auto gain.
b1,b2,b3 = select the correct process
ROM_M6_P_valid | OSDEPROM_M6_R_valid | ROM_M6_R_valid | EPROM_M6_R_valid
EPROM_M6_R_valid | ROMLESS_H5_P_valid | ROM_H5_P_valid | EPROM_M6_A_valid
/* note: ROMLESS_M6_R_valid == ROM_M6_R_valid*/
b4 = Color transition for SVHS of STV224XH (0 = OFF, 1 = ON).
b5 = Tuner Drift Correction ( 0 = OFF, 1 = ON. )
HPOS OSD
Adjustment for horizontal position of OSD.
VPOS OSD
Adjustment for vertical position of OSD.
HPOS TXT
Adjustment for horizontal position of teletext.
VPOS TXT
Adjustment for vertical position of teletext.
HOTEL MODE
To set HOTEL MODE ON or OFF. When HOTEL MODE is enabled. The end user can not make any adjustment of items in menu INSTALL, AUDIO and
ORGANIZE. Menu INSTALL and AUDIO will disappear automatically.
Volume Limit
To set the maximum volume. It’s only available when HOTEL MODE is enabled.
SndSt 1
b0, b1, b2, b3 of SndSt 1 are used to set the sound output level at pin 26 and pin 27 of STV8216 with RF signal. When b0, b2, b2, b3 of SndSt 1 are
all set 0, the minimum sound output level will be got at pin 26 and pin 27 of STV8216 with RF signal. When b0, b2, b2, b3 of SndSt 1 are all set 1, it’s
15 in decimal. The maximum sound output level will be got at pin 26 and pin 27 of STV8216 with RF signal.
b4, b5, b6, b7 of SndSt 1 are used to set the “SURROUND” gain at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt
1 are all set 0, the minimum “SURROUND” gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are
all set 1, it’s 240 in decimal. The maximum “SURROUND” gain will be got at pin 26 and pin 27 of STV8216 with RF signal.
SndSt 2
b0, b1, b2, b3 of SndSt 2 are used to set the sound output level at pin 26 and pin 27 of STV8216 with AV signal. When b0, b2, b2, b3 of SndSt 1 are
all set 0, the minimum sound output level will be got at pin 26 and pin 27 of STV8216 with AV signal. When b0, b2, b2, b3 of SndSt 1 are all set 1, it’s
15 in decimal. The maximum sound output level will be got at pin 26 and pin 27 of STV8216 with AV signal.
b4, b5, b6, b7 of SndSt 2 are used to set the “EQUALIZER” gain at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt
1 are all set 0, the maximum “EQUALIZER” gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are
all set 1, it’s 240 in decimal. The minimum “SURROUND” gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal.
A.F.C. ADJUSTMENT
Removing any R.F. signal source and prevent any stray signal source from entering the tuner by shorting the tuner input inner contact to the out
screen.
Inject the 38.9 MHZ carrier into the tuner IF output pin (pin 11). Select the item ‘VCO Coarse’ in the service mode (see Table 2). The ‘VCO Status…’will
appear at bottom of the screen. Then press the ‘AV’ key on remote control, the CPU will adjust automatically until the ‘VCO Status OK’ appears on the
screen. If this can not be achieved, i.e. there is no any pattern on the screen, please adjust the T201 first until a stable pattern appears on the screen.
And then press the ‘AV’ key on remote control. The CPU will adjust automatically once again until the ‘VCO Status OK’ appears on the screen.
GEOMETRY
To adjust the picture position and vertical size, select the appropriate parameter in the service mode and adjust as necessary. Please see table 2.