Daewoo CM-870 Schematic
SPECIFICATIONS............................................................................................................................... 5
BLOCK DIAGRAM .............................................................................................................................. 6
1. SERVICE MODE ADJUSTMENT ................................................................................................................ 7
2. VCO/AGC ADJUSTMENT ........................................................................................................................... 7
3. PIP VIDEO GAIN ADJUSTMENT................................................................................................................ 7
4. SOUND INPUT LEVEL ADJUSTMENT....................................................................................................... 7
ALIGNMENT INSTRUCTIONS............................................................................................................ 7
1. STEREO ADJUSTMENT ............................................................................................................................ 8
2. FOCU S A D J U S T M E NT .. ....... .. ... ...... ... .. ....... .. .. ....... ... .. ....... .. .. .............. .. ... ...... ... .. ....... .. .. ....... .................... 8
3. GEOMETRY 8
4. WHITE BALANCE ADJUSTMENT.............................................................................................................. 10
5. SUB-BRIGH T A D J U S T M E N T....... .. .............. .. .. ....... ... .. ....... .. .. ....... .. ... ............. ... .. ....... .. .. ....... ... ................. 11
6. PIP DATA ADJUSTMENT............................................................................................................................ 11
IC DESCRIP TIO N .... ... ......... ... ......... ... ... ......... ... ......... ... ......... ... ... ......... .. ......... ... ......... ... ... .. ............... 16
TROUBLE SHOOTING CHARTS. ....................................................................................................... 24
1.NO POWER.................................................................................................................................................. 24
2. NO PIP. ....... .. .. .............. .. .. ....... ... .. ....... .. .. ....... .. ... ....... .. .. ....... .. ... ...... ... .. ....... .. .. ....... .................................... 26
3. NO PIC T U R E.. .. ....... ... .. .............. .. .. ....... .. ... ...... ... .. ....... .. .. ....... ... .. ....... .. .. ....... .. ... ....... .. ............................... 27
4. NO SO U N D..... .. ... ....... .. .. ....... .. ... ...... ... .. ....... .. .. ....... ... .. ....... .. .. ....... .. ... ....... .. .. ....... .. ... ................................. 28
IC DC VOLTAGE CHARTS................................................................................................................. 29
EXPLODED VIEW ............................................................................................................................... 32
ELECTRICAL PARTS LIST................................................................................................................. 34
A DIFFERENCE PARTS LIST BETWEEN.......................................................................................... 46
PCB LAYOUT...................................................................................................................................... 61
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO - VIDEO PRODUCTS
CAUTION
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER°ØS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY
VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANT
RESULTING PROPERTY DAMAGE OR USER INJU RY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND
SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF
POTENTIAL HAZARDS AND INJURY TO THE USER.
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION
FROM A.C. LINE SHOCK.
: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY.
SAFETY CH EC K S
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED, A CHECK SHO ULD BE M AD E OF TH E FO LLO W ING :
SUBJECT:FIRE & S HOCK HAZAR D
1. BE SURE THAT ALL COM PONENTS ARE POSITIONED IN SUCH A WAY AS
TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS
ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS
INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER
SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER
ORIGINAL DESIGN. BE SURE, THAT THE SAFETY PURPOSE OF THE
POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.
3. SOLDERING MUST BE INSPE CTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OF SHARP SOLDER POINTS. BE CERTA IN TO R EM O VE ALL LOO S E FORE IGN PAR TI C LES.
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIO RATION TO
PARTS AND COMPONENTS, FOR FRAYED LEADS, DAMAGED INSULATION
(INCLUDING A.C. CORD), AND REPLACE IF NECESSARY. FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING TUBE OR A
RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUDING METAL SURFACES M UST BE AVOIDED.
6. ALL CRITICAL COM PONENTS SUCH AS FUSES, FLAMEPROOF RESISTOR,
CAPACITORS, ETC. MUST B E REPLACED WITH EXACT FACTO RY TYPES.
DO N OT USE REPLA CEM ENT C OM PO NENTS OTH ER TH AN THO SE SP ECIFIED OR MAKE UNRECOMM ENDED CIRCUIT MO DIFICATIONS.
7. AFTER RE-ASSEM BLY OF THE STE ALWAYS PERFORM AN A.C. LEAKAGE
TEST O N ALL EXPO SED METALLIC PARTS OF TH E CABINET. (TH E CHA NNEL SELECTOR KNOB, ANTENNA TERMINALS, HANDLE AND SCREWS) TO
BE SUR E THE S ET IS SAFE TO OP ER ATE W ITHOUT DAN GE R O F ELE CTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING
THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VO LT OR
M OR E SENSITI V ITY, IN THE FO LLOW ING M ANN E R : C ONN ECT A 15 00 OH M
10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150V A.C. TYPE CAPACITOR BETW EEN A KNO WN GOOD EARTH GROUND (WATER POPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM
RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND
REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC
PART. VOLTAGE MEASURED MUST NOT EXCEED .75 VOLTS R.M.S THIS
CORRESPONDS TO 0.5 MILLIAMP A.C. NAY VALUE EXCEEDING THIS LIMIT
CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CO RRECTED
IMMEDIATELY.
A.C. VOLTMETER
0.15 uF
GOOD EARTH GROUND
SUCH AS THE WATER
PIPE, CONDUIT, ETC.
1500 OHM
10WATT
PLACE THIS PROBE
ON EACH EXPOSED
METAL PAR T
SUBJEC T : GRA PHIC SY MBO LS
THE LIGHTNING FLASH WITH ARR OWH EAD SYM BO L,
WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED
TO ALERT THE SE RVICE PER SONN EL TO THE PR ESENCE OF UNINSULATED “DANGEROUS VOLTAGE”
THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A R ISK O F ELEC TRIC SH O C K.
THE EXCLAMATION POINT W ITHIN AN EQUILATERAL
TRIANGLE IS INTE NDED TO ALERT THE SERVICE
PERSONNEL TO THE PRESENCE OF IMPORTANT
SAFETY INFORM ATION ON S ERVICE LITERATURE.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL
SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE.
HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS
GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE
SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, AMY PRODUCE RADIATION IN EXC ES S O F D ESIRA BLE LEVE LS.
2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE USED.
DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN CO LOR SETS.
ALWAYS RE-INSTALL THEM.
3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATIO N OF THE
METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE
STANDARD. SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE
IS NO P OS SIBILITY O F AN X-RADIATION PR O BLEM . EVER Y TIME A C OLO R
CHASSIS IS SERVICED, THE BRIGHTNESS SHOULD BE RUN UP AND
DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE
CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED
VALUE AND THAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT
YOU AND YOUR SERVICE ORGANIZATION REVIEW TEST PROCEDURES
SO THAT VOLTAGE REGULATIO N IS ALWAYS CHECKED AS A STANDARD
SERVICING PROCEDURE, AND THAT THE HIGH VOLTAGE READING BE
RECORDED ON EACH CUSTOMER°ØS INVOICE.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A
PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID
BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH
VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS
NECESSARY TO LOCATE THE CAUSE OF EXCESSIVE VOLTAGE.
6. REFER TO HV, B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE
USED).
SUBJECT : IMPLOSION
1. ALL DIR ECT VIEW ED PICTURE TU BES AR E EQUIPPED WITH AN INTEGR A
IMPLOSION PR O TEC TION SYS TEM. BUT CA R E SHO UL D B E TAKEN TO
AVOID DAMAGE DURING INSTALLATION. AVOID SCRATCHING THE
TUBE. OF SCRATCHED REPLACE IT.
2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
SUBJECT : TIPS ON PROPER INSTALLATION
1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR
CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN
THE PATH OF HEATED AIR FLOW.
2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS
WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PLACEMENT W HERE DRAPERIES MAY OBSTRUCT REAR VENTING.
THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE
SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL
MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTING
INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST
RETAIN ITS ORIGINAL FEET (OR THE EQ UIVA LENT T HIC KNESS IN SPACERS)TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS
OR SCREWS USED FOR FA STENERS MUST NOT TOUCH ANY PARTS OR
WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIO NS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON
SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PRO PERLY SECU RED .
6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHO LDS OR
DEEP PILE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH
HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES. INC. FOR
USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR
GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR
LARGER SCREEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SING LE
OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND
FAM ILY.
PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVIS ION RECEIVERS
CAUTION : Do not attempt to modify this product in any way. Unautho riz ed mo d if ic a tio n s will n o t o n ly v oid the w arran ty, b u t may le a d to
your being liable for any resulting property damage or user injury.
Service work should be performed only after you are thoroughly
fam iliar w ith a ll of th e fo llow ing sa fety che cks and servicing guidelines. To do otherwise, increases the risk of potential hazards and
injury to the user.
SAFETY CHECKS
After the original service problem has been corrected, a check should be made of the following:
SUBJECT : FIRE & SHOCK HAZAR D
1. Be sure that all components are positioned in such a way as to
av oid po ssib ility of adja cen t com ponent shorts. This is especially
important on those chassis which are transported to and from the
repair shop.
2. Never release a repair unless all protective devices such as insulators, barriers, covers, shields, strain reliefs, and other hardware
have been reinstalled per original design.
3. Soldering m us t be ins pecte d to dis co ve r poss ible cold solder join t s,
frayed leads, damaged insulation (including A.C. cord), solder
splashes or sharp solder points. Be certain to remove all loose foreign particals.
4. Check for physical evidence of damage or deterioration to parts
and components, and replace if necessary follow original layout,
lead length and dress.
5. No leads or components should touch a receiving tube or a resistor
rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.
6. All critical componen ts such as fuses, flam eproof resistors, capacitors, etc. must be replaced with exact factory types. Do not use
replacement components other than those specified or make
unrecommended circuit m odifications.
7. After re-assembly of the set always perform an A.C. leakage test
on a ll ex po sed m eta llic pa rts o f th e ca bine t, (th e ch a nne l sele cto r
knob, antenna terminals, handle and screws) to be sure the set is
safe to operate without danger of electrical shock. D o not use a
line isolation transformer during this test. Use an A.C. voltmeter,
having 5000 ohms per volt or more sensitivity, in the following
manner : connect a 1500 ohm 10 watt resistor, paralleled by a 15
mfd. 150V A.C. type capacitor between a known good earth
ground (9water pipe, conduit, etc.) and the exposed metallic parts,
one at a time. Measure the A.C. voltage across the combination of
1500 ohm resistor and 0.15 M FD capacitor. Reverse the A.C . plug
and r ep ea t A .C . v o ltag e m ea s u reme nt s fo r e a ch ex p os ed m e ta llic
part. Voltage measured must not exceed 0.75 volts R.M.S. This
corresponds to 0.5 milliamp A.C. Any value exceeding this limit
constitu tes a potential shock hazard and must be corrected immediately.
A.C. VO LTMETER
GRAPHIC SYMBOLS :
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to alert
the service personnel to the presence of uninsulated “dangerous voltage” that may be of sufficienty magnitude to constitute a risk of electric
shock.
The exclamation point within an equilateral triangle is intended to alert the service personnel
to the presen ce of im porta nt safe ty inform ation
in s ervice literature.
Fuse symbol is printed on pcb adjacent to the
fuse, w ith “RIS K O F FIR E R EP LAC E FU SE AS
MARKED”. The symbol is explained in the service manual with the following wording or equivalent.
“CAUTION :
FOR CONTINUED PROTECTION AGAINST FIRE
HAZARD, REPLACE ONLY WITH SAME TYPE (6.3A, 250V)” and
ATTENTION
“
: AFIN D’ASSU UNE PROTECTION PERMANENTE
CONTRE LES RISQUES D’INCENDIE, REMPLACER UNIQUEMENT PAR UN FUS IBLE DE MEME TYPE ET DE ”6.3A, 250V”.
SUBJECT : X-RADIATION
1. Be sure procedures and instructions to all service personnel cover
the subject of X-rays in current T.V. receivers is the picture tube.
However, this tube does not emit X-rays when the high voltage is
at the factory specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure
of the picture tube or high voltage supply and, under certain circumstances, may produce radiation in excess of desirable levels.
2. Only factory specified C.R.T. anode connectors must be used.
Degaussing shields also serve as X-ray shield in color sets.
Alw a y s re -ins ta ll them.
3. It is essential that the serviceman has available an accurate and
reliable high voltage meter. The calibration of the meter should be
checked perio - dically against a reference standard. Such as the
one available at your distributor.
4. When the high voltage circuitry is operating properly there is no
po ss ib ility o f a n X -ra d iatio n pr ob lem. Ev ery tim e a c olo r c ha s sis is
serviced, the brightness should be run up and down while m onitoring the high voltage with a meter to be certain that the high voltage
does not exceed the specified value and that it is regulating correctly. We suggest that you and your service organization review
test procedures so that voltage regulation is always checked as a
standard servicing procedure. And that the high voltage reading be
recorded on each customer’s invoice.
5. When troubleshooting and making test measurements in a
receiver with a problem of excessive high voltage, avoid being
unnecessarily close to the picture tube and the high voltage compartment.
Do not operate the chassis longer than is necessary to locate the
cause of excessive voltage.
6. Refer to HV, B+and Shutdown adjustment procedures described in
the appropriate schematic and diagram s(where used).
Good earth ground,
such a s the water
pipe, conduit, etc.
0.15 uF
1500 OHM
10WATT
Place this probe
on each exposed
metal part.
SUBJEC T : IMPLOSION
1. All direct viewed picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage
during installation. Avoid scratching the tube. If scratched, replace
it.
2. Use only recommended factory replacement tubes.
SUBJEC T : TIPS ON PRO PER INSTALL ATION
1. Never install any receiver in closed-in recess, cubbyhole or closely
fitting shelf space over, or close to heat duct, or in the path of
heated air flow.
2. Avoid conditions of high humidity such as : Outdoor patio installations where dew is a factor. Near steam radiators where steam
leakage is a factor, etc.
3. Avoid placement where draperies may obstruct rear venting. The
customer should also avoid the use of decorative scarves or other
coverings which might obstruct ventilation.
4. Wall and shelf mounted installations using a comm ercial mounting
kit, must follow the factory approved mounting instructions. A
receiver mounted to a shelf or platform must retain its original
feet(or the equivalent thickness in spacers) to provide adequate
are flow across the bottom, bolts or screws used for fasteners
must not touch and parts or wiring. Perform leakage test on customized installations.
5. Caution customers against the m ounting of a receiver on sloping
shelf or a tilted position, unless the receiver is properly secured.
6. A receiver on a roll-about cart should be stable on its mounting to
the cart. Caution the customer on the hazards of trying to roll a cart
with small casters across thresholds or deep pile carpets.
7. Caution customers against the use of a cart or stand which has not
been listed by underwriters laboratories, inc. For use with their
specific model of television receiver or generically approved for
use with T.V.’s of the same or larger screen size.
SPECIFICATIONS
DTH-25G1FST
MODEL
TV STANDARD NTSC/PAL-M/PAL-N
MAINS VO LTAG E 100~250V AC, 50/60Hz
POWER C ONSU MPTION 110W 120W
SOUND OUTPUT 5W+5W
SPEAKER 7W 8Ohm(2EA)
ANTEN NA IMP EDAN CE 75 ohm unbalanced
TUNIN G SYSTEM Frequency Synthesize Tuning System
MEM O RY CH AN NEL 181 Channels
RECEPTION CHANNEL UNIT VHF TV LOW : CH2 - CH6
REMOTE CONTROL UNIT R-23B04
SCRE EN SIZE 25” Diagonal 29” Diagonal
WEIGH T 35Kg 42Kg
TUNER TYPE Varactor Type with PLL
AUX. TERM INAL(IN PUT) Front : Video, Audio(L/R)
AUX. TERM INAL(OUTPUT) Rear : Video, Audio( L/R)
DTH-25G1FSP
DTH-25G1FS
HIGH : CH7 - CH1 3
CH1, CH14 - CH125
U H F T V CH 1 4 - CH6 9
Rear : Video, A udio(L/R)
DTH-29G1FST, DTH-29G3FST
DTH-29G1FSP, DTH-29G3FSP
DTH-29G1FS, DTH-29G3FS
BLOCK D IAGR AM
ALIGNME NT INSTRU CTIO NS
- ALIGNMENT BY USER REMOCON
1. SERVICE MODE ADJUSTMENT
How to enter into Service Mode.
1) Direct the remote control to the reception w indow of TV.
2) Push button of rem ote control in sequence.
MUTE RECALL MUTE
1
3) Then, the screen will appear as follows.
S5 : PIC ADJ
S5 : PIC ADJ
S6 : GEOMETRY
S7 : PIP ADJ
S6 : GEOMETRY
S8 : R GB ADJ
S7 : PIP ADJ
S9 : DP ADJ
S10 : P/S ADJ
S8 : RGB ADJ
S11 : AUTO PIC
TO EXIT : POW ER OFF
S9 : DP ADJ
When you select a item , its turns into the green.
How to memorize the adjusted settings in service mode; Must press RECALL button the state which the screen is
displaying each of service menus after all adjustments are com pleted each of all service menu.
2. VCO/AGC ADJUSTMENT
1) Receive the COLOR BAR signal. (INPUT LEVEL : 60 dBuV)
2) Select the S10 of service mode to display items, then press the
3) Press
4) It will start auto adjustment if you press
5) After adjustment, the “ VCO O K *** ” or “ AGC O K *** ” OSD w ill be displayed.
CH buttons on the rem ote control to select VCO or AGC
VOLbuttons.
VCO
VCO
AGC
AGC
VCO31
S MANUAL
VCO31
S MANUAL
VOLbuttons on the remote control.
3. PIP VIDEO GAIN ADJUSTMENT
1) Turn ON the PIP and receive the COLO R BAR PATTE RN.
2) Turn the volume R128 to set 1Vp-p on TP1.
4. SOUND INPUT LEVEL ADJUSTMENT
1) Receive the 100% mod. MON O. Signal.
ALIGNMENT INS TR UCTIO NS
2) Select the S10 of service mode to display items, then press the VOLbuttons on the remote control.
3) Press
4) Press
become 490m V (+20mV/-5mV).
5) Press the REC ALL button of remote control to store.
CH buttons on the remo te co ntrol to select S MANUAL and press VOL buttons on the remo te control.
CH buttons on the remote control to select INPU T LE VEL and pressVOLbuttons to set T P2
INPUT LEVEL 15
INPUT LEVEL 15
WIDEBAND 23
WIDEBAND 23
SPECTRAL 32
SPECTRAL 32
5. STEREO AD JUS TMENT
1) Receive the Zenith M TS signal of 1KHz CH(L only).
2) Connect scope at T P2 to verify R out correspondent.
3) Select the S10 of service mode to display items, then press the VOLbuttons on the remote control.
4) Press
5) Press
6) Adj us t with
7) Press
8) Adj us t with
9) Press the RECA LL button on the remote control to store.
CH buttons on the remo te co ntrol to select S MANUAL and press VOL buttons on the remo te control.
CH buttons on the remote control to select WIDEBAND and pressVOLButtons on the remote con trol.
VOLbuttons till the Rout(scope) become minim um .
CH buttons on the remote control to select SPE CTRAL and pressVOLButtons on the remote con trol.
VOLbuttons till the Rout(scope) become minim um .
INPUT LEVEL 15
INPUT LEVEL 15
WIDEBAND 23
SPECTRAL 32
WIDEBAND 23
SPECTRAL 32
6. FOCUS ADJUSTMENT
1) Receive the RETM A PATTER N signal.
2) Adjust the FOC US VOLU ME of FBT to obtain the clearest picture
7. GEOM ETRY
7-1. VERT ICAL CENT ER AD JUST MEN T
1) Receive the RETM A PATTER N signal.
2) Set the user control A UTO PICTUR E to STANDAR D m ode.
3) Select the S6 of service mode to display items, then press the VOLbuttons on the remote control.
ALIG NMENT INSTRUCTIONS
4)Press CH buttons on the remote control to select V CE N T ER and press VOL buttons on the remote
control to adjust the horizontal line of RETM A PATTER N S center m ay m e et with the mechan ical CENT ER of CRT.
5) Press the RECA LL button on the remote control to store.
V CENTER 05
V CENTER 05
V SIZE 31
H CENTER 18
V SIZE 31
H CENTER 18
V LIN 10
VS COR 09
GEO ADJ ON
V LIN 10
7-2. VERTICAL SIZE ADJUSTME NT
1) Receive the R ETM A PATTERN signal.
2) Set the user control AUTO P ICTU RE to STANDAR D m ode.
3) Select the S6 of service mode to display items, then press the VOLbuttons on the remote control.
4) Press
CH buttons on the remote control to select V SIZE and press VOL buttons on the remote control
to adjust the CENTE R OF CIR CUM F ER E N CE of big circle may meet w ith the upper and Lower sides of screen.
5) Press the RECA LL button on the remote control to store.
V CENTER 05
V CENTER 05
V SIZE 31
H CENTER 18
V SIZE 31
H CENTER 18
V LIN 10
VS COR 09
GEO ADJ ON
V LIN 10
7-3. VERTICAL LINEARITY ADJUSTMENT
1) Receive the R ETM A PATTERN signal.
2) Set the user control AUTO P ICTU RE to STANDAR D m ode.
3) Select the S6 of service mode to display items, then press the
4) Press
5) Adjust
CH buttons on the remote control to select V LIN,VS CO R
VOL buttons to be round center circle of R ETM A PATTERN
6) Press the RECA LL button on the remote control to store.
V CENTER 05
V CENTER 05
V SIZE 31
H CENTER 18
V SIZE 31
VOLbuttons on the remote control.
H CENTER 18
V LIN 10
VS COR 09
GEO ADJ ON
V LIN 10
ALIG NMENT INSTRUCTIONS
7-4. HORIZONTAL CENTER ADJUS TMENT
1) Receive the R ETM A PATT E R N signal.
2) Set the user control AUTO P ICTU RE to STANDAR D m ode.
3) Select the S6 of service mode to display items, then press the
4) Press
CH buttons on the rem ote control to select H C EN TE R and press VOL buttons on the remote
control to adjust the left and right W IDTH of RE TM A PATTE R N becom e sym m etrical.
5) Press the R ECALL button on the remote control to store.
V CENTER 05
V CENTER 05
V SIZE 31
H CENTER 18
V SIZE 31
H CENTER 18
V LIN 10
VS COR 09
GEO ADJ ON
V LIN 10
VOLbuttons on the remote control.
7-5. HORIZONTAL WIDTH ADJUSTMENT
Receive the RE TMA PATTERN signal.
Set the user control A U TO PICTU RE to STANDAR D m ode.
Adjust R 406 in order to set the left and right end of RETMA PATTERN on point 5.
7-6. SIDE PINCUSHION ADJUSTMENT
1) Receive the R ETM A PATTERN signal.
2) Set the user control AUTO P ICTU RE to STANDAR D m ode.
3) Select the S11 of service mode to display items, then press the
4) Press
CH buttons on the remote control to select S G PATTERN 8 and press VOL buttons on the
VOLbuttons on the rem ote control.
rem o te co ntrol to selec t SG PATTE R N 2 o f SG PATTE R N 8
5) Adjust R 4 09 in order to set the second line from right side becom e straight.
6) After PO WER O FF /ON readjust H O R IZON TAL WIDTH with R406.
STANDARD
STANDARD
SOFT
SOFT
STRONG
MUSIC
STRONG
MOVIE
SG PATTERN 8
MUSIC
STANDARD
SOFT
STRONG
MUSIC
MOVIE
SG PATTERN 2
MOVIE
8. WHITE BALANCE ADJUSTMENT
1) Execute HEAT RUN of the TV set over 30 minutes.
2) Connect the signal output of white balance tester(Nitsuki 2840) to the ANTENN A(or VIDEO IN) input of theTV SET.
Stick and fix the SENSOR to the center position of CRT.
3) Select the S8 of service mode to display items, then press the
VOLbuttons on the remote control.
ALIG NMENT INSTRUCTIONS
4) Adjust the R.G.B BIAS and G.B DRIVE, with VOLbuttons, in order that R.G.B of the High and Low BEAM may
meet with the CENTE R LED of each measuring instrument.
5) At this time, the memorized coordinates of the white balance tester, unless otherwise specified, use above coordinates
and color temperature(9600
6) Press the R E C ALL button on the remote control to store.
G DR IVE 0 61
G DRIVE 061
B DRIVE 070
B DRIVE 070
R CUT 127
B CUT 060
G CUT 087
K 265X295).
°
9. SUB-BRIGHT ADJUSTMENT
1) Receive the R ETM A PATTERN signal.
2) Set the user control AUTO P ICTU RE to STANDAR D m ode.
3) Select the S9 of service mode to display items, then press the VOLbuttons on the remote control.
4) Press
control to adjust Sub bright level in order that the gradation pattern may serve 18% of BRIGHT NESS.
5) Press the RECA LL button on the remote control to store.
CH buttons on the remote control to select BRIGHTNESS and press VOL buttons on the rem ote
DP ADJUST
DP ADJUST
BRIGNTNESS 32
CONTRAST 14
BRIGNTNESS 32
CO L O R 20
CONTRAST 14
TINT 45
COLOR 20
TINT 45
10. PIP DATA ADJUSTMENT
1) Select the S7 of service mode to display items, then press the VOLbuttons on the remote control.
2) Adjust PIP sub data.(TINT : 057, Y DE LAY : 00, SYN C D ELAY : 15, VSIDEL : 06, VSPDE L : 00)
3) Press the RECA LL button on the rem ote control to store.
PIP TIN T 057
PIP TINT 057
H POS 146
V POS 032
H POS 146
Y DELAY 00
V POS 032
SYNC DELAY 15
VSIDEL 06
Y DELAY 00
VSPDEL 00
SYNC DELAY 15
ALIGNMENT INSTRUC TIONS
- ALIGNMENT BY SERVICE REMOCON
1. VCO/AGC ADJUSTMENT
1) Receive the COLOR BAR signal. (INPUT LEVEL : 60 dBuV)
2) Press S10 button on the SVC remote control to display MENU .
3) Press CH buttons on the SVC remote control to select V CO or AGC
4) It w ill start auto adjustm ent if you press
5) After adjustment, the “VCO O K ***” or “AG C O K ***” OSD will be displayed.
VOLkey
2. PIP VIDEO GAIN ADJUSTMENT
1) Turn ON the PIP and receive the COLOR B AR PAT TER N .
2) Turn the volume R 128 to set 1Vp-p on TP1.
3. SOUND INPUT LEVEL ADJUSTMENT
1) Receive the 100% m od. M ON O . Signal.
2) Press S10 button on the SVC remote control to display M ENU
3) Press CH buttons on the SVC remote contro l to select S MAN UAL and press VOL buttons on the SVC
rem ote co ntrol
4) Press
become 490m V (+20mV/-5mV).
5) Press the RECA LL button of SVC remote control to store.
CH buttons on the SVC remote control to select IN PU T LE VE L and pressVOL button s to s et TP2
4. STEREO AD JUS TMENT
1) Receive the Zenith MTS signal of 1KHz CH (Lonly).
2) Connect scope at T P2 to verify R out correspondent.
3) Press S10 button on the SVC remote control to display MENU.
4) Press
rem ote co ntrol
5) Press CH buttons on the SVC remote control to select W IDEBA ND and pressVOL Buttons
6) Ad just with
7) Press
8) Ad just with
9) Press the R EC ALL button on the S VC remote control to store.
CH buttons on the SVC remote control to select S M AN U A L and press VOL buttons on the SVC
VOLbuttons till the Rout(scope) become minimum.
CH buttons on the SVC remote control to select SPECTRAL and pressVOL Buttons
VOLbuttons till the Rout(scope) become minimum.
5. SCREEN ADJ U STME NT
1) Receive the RETM A PATTE RN signal.
2) Obtain horizontal line pressing S 2 button on the SVC remote control.
3) Adjust the SCR EE N V O LUME of FBT in order to the horizontal line of screen disappear.
4) Press the S2 button on the SVC remote control.
6. FOCUS ADJUSTMENT
1) Receive the R ETM A PATTERN signal.
2) Adjust the FO C US V O LU M E of FBT to obtain the clearest picture.
7. GEOM ETRY
7-1. VERTICAL CENTER ADJUSTMENT
1) Receive the RETMA PATTER N signal.
2) Set the user control A U TO PICTU R E to STANDARD mode.
3) Press S6 button on the SVC remote control to display MENU
4) Press
SVC remote control to adjust the horizontal line of RETMA PAT TERN S center may m eet with the mechanical
CE N T E R o f CR T.
5) Press the RECA LL button on the SVC remote control to store.
7-2. VERTICAL SIZE ADJUSTMENT
1) Receive the R ETMA PATTERN signal.
2) Set the user control A UTO PICTURE to STANDA RD mode.
3) Press S6 button on the SVC remote control to display MENU
4) Press
CENTE R O F C IRCU M F ER ENCE of big circle may m eet with the upper and Lower sides of screen.
5) Press the R E C ALL button on the SVC remote control to store.
CH buttons on the SVC remote control to select V CE NT ER and press VOL buttons on the
CH buttons on the SVC remote control to select V SIZE and press VOL buttons to adjust the
ALIG NMENT INSTRUCTIONS
7-3. VERTICAL LINEARITY ADJUSTMENT
1) Receive the RET MA PATTERN signal.
2) Set the user control AUTO PICTU RE to STANDAR D m ode.
3) Press S6 button on the SVC remo te control to display M E NU
4) Press
5) Ad just
6) Press the R E CALL button on the SVC remote control to store.
CH buttons on the SVC remote control to select V LIN,VS CO R
VOL buttons to be round center circle of RETMA PATTE RN
7-4. HORIZONTAL CENTER ADJUSTM ENT
1) Receive the RETM A PATTE RN signal.
2) Set the user control AU TO PICTU R E to STANDAR D mode.
3) Press S6 button on the SVC remote control to display ME NU
4) Press
SVC remote control to adjust the left and right W IDTH of RETMA PATTERN becom e sym metrical.
5) Press the R ECALL button on the SVC remote control to store.
CH buttons on the SVC rem ote control to select H CEN TE R and press VOL buttons on the
7-5. HORI ZONT AL WI DTH ADJUST ME NT
1) Receive the R E TM A PATTERN signal.
2) Set the user control A UTO PICTURE to STAN DAR D mode.
3) Adjust R406 in order to set the left and right end of RETMA PATTERN on point 5.
ALIGNMENT INSTRUC TIONS
7-6. SIDE PINCUSHION ADJUSTMENT
1) Receive the R ETMA PATTERN signal.
2) Set the user control A UTO PICTURE to STAND ARD mode.
3) Press S11 button on the SVC remote control to display ME N U
4) Press
on the SVC remote control to select SG PATTERN 2 of SG PATTERN 8
5) Adjust R409 in order to set the second line from right side becom e straight.
6) After POW ER O FF/ON readjust HO RIZONTAL WIDTH w ith R406.
CH buttons on the SVC remote control to select S G PATT ERN 8 and press VOL buttons
7-8. WHITE BALA NC E ADJUS TME NT
1) Execute HEAT RUN of the set over 30 minutes pressing S1 button on the SVC remote control .
2) Connect the signal output of white balance tester(NIT S U KI 2840) to the antenna input of the TV SET. S tick
and fix the SENSO R to the center position of CRT.
3) Press S8 button of SVC rem ote control and adjust the R .G.B BIAS and G .B DR IVE, with
order that R .G.B of the High and Low BE A M may m eet with the C EN TER LED of each measuring instrument.
4) At this time, the m em orized coordinates of the w hite balance tester, unless otherwise specified, use above
coordinates and color temperature(9600
5) Press the RECALL button on the SVC remote control to store
K 265X295).
°
VOLkey, in
7-9. SUB-BRIGHT ADJUSTMENT
1) Receive the R E TM A PATTERN signal.
2) Set the user control A UTO PICTURE to STAN DAR D mode.
3) Choose BRIGHTNESS of MENU pressing S9 button on the SVC remote control .
4) Press
BRIGHTNESS.
5) Press the R EC ALL button on the SVC remote control to store
SVC Remote Control
1) S1 KEY : heat run mode(ON/OFF)
2) S2 KEY : screen voltage adjust mode(ON/OFF)
3) S3 KEY : sound test mode
4) S4 KEY : picture test mode
5) S5 KEY : m ain IC bus data adjust m ode
- AGC : AG C adjust(0 ~ 63)
- VCO : VCO adjust(0 ~ 127)
- TOF : 3.58MH z BPF select(RF:1, VID EO :0).
- TRAP : 3.58MHz TRAP ON/OFF(ON:1, O FF:0).
- AFC G : AFC Gain select(norm al:00, 1/3:01, X3 at VBLK:10, OFF:11).
- WPS : White Peak Suppressor select(ON:0, OFF:1).
- V AGC : Vertical AGC speed select(normal:0, X3:1).
- SW VIDEO : VIDEO input select(TV:00, EXT:01, TV Y/C:10, EXT Y/C:11).
- ABL G : ABL G ain select(-0.12V:00, -0.37V:01, -0.64V:10, -0.74:11).
VOLbutton to adjust Sub bright level in order that the gradation pattern m ay serve 18% of
- ABL S : ABL S tart point select(-0.01V:00, -0.11V:01, -0.3V:10, -0.45V:11).
- 60H : vertical frequency of VIDEO B LUE BACK select.
- RGB : PIP CONTRAST adjust(0 ~ 63)
- SW38 : VIDEO variation (ON:0, OFF:1).
6) S6 KEY : geometry adjust mode
- V CEN TER : V CENTER adjust(0 ~ 7)
- V SIZ E : V SIZE adjust(0 ~ 63)
- H CENTER : H CENTER adjust(0 ~ 32)
- V LIN : VERTICAL LINERITY adjust(0 ~ 15)
- VS COR : V-S CORRECTION adjust(0 ~ 15)
7) S7 KEY : PIP item adjust mode
- PIP TINT : PIP TINT adjust(0 ~ 127)
- H POS : PIP HOR IZONTAL POSITION adjust(0 ~ 255)
- V POS : PIP VERTICAL POSITION adjust(0 ~ 255)
- Y D ELAY : PIP Y D ELAY adjust(0 ~ 7)
- SYNC DELAY : PIP SYNC. DELAY(0 ~ 15)
- VSIDEL : VERTIC AL SYNC . DELAY adjust(INSET SIGNAL, 0 ~ 32)
- VSPDEL : VERTICAL SYNC. DE LAY adjust(PARENT SIGNAL, 0 ~ 32)
8) S8 KEY : WHITE BALANCE adjust mode
- G DRIVE : 0 ~ 127
- B DRIVE : 0 ~ 127
- R BIAS : 0 ~ 255
- G BIAS : 0 ~ 255
- B BIA S : 0 ~ 255
9) S9 KEY : DP adjust mode
- BRIGHT : 0 ~ 63
- CONTRAST : 0 ~ 15
- COLOR : 0 ~ 63
- TIN T : 0 ~ 63
10) S10 KEY : VCO, AG C Auto adjust, SOUN D adjust
- VCO : VCO Auto adjust
- AGC : AGC Auto adjust
- S MAN U A L : SOUND adjust mode
INPUT LEVEL : SO UND input level adjust(0 ~ 15)
•
W IDEBA ND : STERE O SE PARATION RATIO(300Hz) adjust(0 ~ 63)
•
SPEC TR AL : STE R EO S EPARATION RATIO(3KHz) adjust(0 ~ 63)
•
11) S11 KEY : AUTO PICTURE, AUTO SOUND BUS DATA setting m ode
- STANDAR D : CON 52, BRI 32, SHA 48, CO L32
- SOFT : CON 32, BRI 32, SHA 48, CO L30
- STRON G : CO N 60, BRI 32, SHA 52, COL38
- MUSIC : TREBLE 50, BASS 50
- MOVIE : TR EBLE 36, BASS 48
- TEST PATTERN 8 : TEST PATTERN(8 MO DE)
12) S12 KEY : O U T OK
ALIG NMENT INSTRUCTIONS
IC DESCRIPTION
I701
♦
- TMP87CM38N (M-com)
1. Pin Description
PIN NAME FUNCTIO N REMARK
1 VSS Ground
2 TINT TINT control output
3 P41(PWM0) Ground
4 P42(PWM1) Ground
5 P43(PWM2) Ground
6 P OWE R - Ac tiv e H igh
- Low state at initial condition(RESET)
- Toggle Low/High when power key input is detected.
Lo w
Power OFF
Hig h
Power ON
- Autom atically turns to Low when S leep Timer(count down) counts ”0”
- Autom atically turns to Low when the OFF TIMER is set and the clock
(TV ) ind ica te s O FF - TIME .
- Autom atically turns to High when the ON TIMER is set and the clock
(TV ) ind ica te s O N-TIME.
- Autom atically turns to Low when A uto Power OFF.
7 KEY OUT KEY OUTPUT
8 KEY OUT KEY OUTPUT
9 KEY OUT KEY OUTPUT
10 ID Timer/coun ter input
11 P51(SI1/S CL1/PWM 9) G round
12 P52(SO 1/SDA1) Ground
13 P53(SCK 1/IN T2/TC1/A INO) Ground
14 P54(AIN1) Ground
15 KEY IN KEY INPUT
16 KEY IN KEY INPUT
17 OC P Over Current P rotect
18 M A FT AFT input
19 C.V OUT Test video signal output
20 KEY IN KEY INPUT
21 VSS G round
22 OS D R R output
23 OS D G G output
24 OS D B B output
25 OS D Y
26 H SY NC - Sync. Signal for H or_position
S
Focus signal output
- 0 ~ 5V pu lse
- Detect input-Active Low
IC DESCRIPTION
PIN NAME FUNCTIO N REMARK
27 V SY NC - Sync. Signal for Vertical position
- 0 ~ 5V pu lse
-Detect input-Active Low
27 V SY NC - Sync. Signal for Vertical position
- 0 ~ 5V pu lse
-Detect input-Active Low
2829OSC1
OSC2
30 GN D Ground
3132X IN
X OU T
33 RESET - SYSTEM Reset(Hardware Reset) input term inal
34 50/60H z 50/60H z
35 IR IN REM O TE C ONT RO L signal input terminal
36 M S D Time r coun ter input
37 SC L
38 SD A
39 P34(SCL0)/P57 Ground
40 P35(SDA0)/P32(INT4) Ground
41 S M UT E Sound mute
42 VD D +5V
O S D os c illa to r
8MHz X-TAL input/output
- Ac tiv e Lo w
2
I
C bus serial clock input/output
2
I
C bus serial data input/output
I501
♦
- TB1238N(IF + VCD PRO CESS OR )
1. Pin Description
PIN NAM E FUNCTION REMARK
1 De-Emphasis The term inal to be connected with capacitor for deemphasis.
2 Audio O utput N.C
3IF V
(9V) The term inal for Vcc of PIF circuit.
CC
4 AFT Output The term inal for AFT output and Self-adj. Output.
5 IF G ND The te r mina l fo r GND o f P IF c irc u it.
67IF In p u t
The term inal for IF signal input.
IF In p u t
8 RF AGC The term inal for RF AGC output (open collector Output).
9 IF AGC The term inal to be connected with an IF AG C filter.
10 APC Filter T he term inal to be connected with APC filter for chrom a dem odulation.
11 Xtal The term inal to be connected with a 4.433619M Hz Xtal oscillator.
12 Y /C GND Th e te rmin a l fo r G ND o f Y /C c ircu it.
IC DESCRIPTION
PIN NAM E FUNCTION REMARK
13 Ys/Ym. The term inal for switching of analog RG B M ode and fast
half tone.
14
Analog R Input
15
Analog G Input
16
Analog B Input
17 RG B V
18
R Output
19
G Output
20
B Output
(9V ) The te rmina l for V cc o f RGB c ircuit (TE X T circ uit).
CC
21 A B C L The te r mina l fo r A BL /AC L c o n tro l.
22 V. Ram p The terminal to be connected with a capacitor to make V Ramp signal.
23 V. NFB The term inal for input of V.sawteeth signal feedback.
24 V. Output The term inal for output of vertical drive signal.
25 V. AG C The term inal to be connected with a capacitor for V. AG C.
26 SCL
27 SDA
28 H. V
(9V) The term inal for Vcc of deflection circuit.
CC
29 S ID/CW OU T The terminal for PAL/NTSC ID output and SE CAM ID input.
30 FBP Input The term inal for FBP Input.
31 SYNC O utput The terminal for composite sync. Output(open collector output).
32 H. Output The term inal for output of horizontal drive signal.
33 DEF G ND The terminal for GND of deflection circuit.
34 SCP O utput N.C
35 Video output The term inal for Video Switch output.
36 Dig. V
(5V ) The te rmina l for V
DD
3738SECAM .B-Y Input
SECAM .R-Y Input
39 Y Input The term inal for Y input.
40 H . A F C T he te r mina l to b e c o n ne c te d w ith H . A F C filter.
41 EXT. Video/Y
Input
42 Dig. G N D The terminal for GND of digital block.
43 TV Input The term inal for input of com posite video signal from PIF Det.
44 BLACK Det The terminal to be connected with Black Det. filter.
45 EXT. C Input The terminal for input of chroma signal from TVs ext.jack.
46 Y/C V
(5V) The term inal for Vcc of Y/C circuit.
CC
47 IF Det. Output The terminal for output of composite video signal and SIF signal detected
48 LOOP Filter The term inal to be connected with loop filter for IF PLL.
49 VCO GN D The term inal for GND of VCO and SIF circuit.
The term inal for analog RGB signals input.
The term inals for RGB signals output.
The term inal for input of I
The term inal for input/output of I
2
C bus clock.
of digital block.
DD
2
C bus data.
N.C
The term inal for input of com posite signal or Y signal from
TVs ext. jack.
Output.
in IF circ u it.
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