7. Service parts list .......................................................................................................................... 20
1
1. Improtant Service Notes
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO - VIDEO PRODUCTS
CAUTION :
DO NOT ATTEMPT TO MOOIFY THIS PROOUCT IN AHY WAY.
NEVER PERFORM CUSTOMIZED INSTALLATI0NS WITHOUT MANUFACTURER" S
APPROVAL. UNAUTHORIZED MOOIFICATI0NS WILL NOT ONLY VOID THE WARRANTY,
BUT MAY LEAD TO YOUR BEING LIABLE FOR ANT RESULTING PROPERTY DAMAGE OR
USER INJURY. 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.
SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED, A CHECK SHOULD
BE MADE OF THE FOLLOWING :
SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID
POSSIBILITY OF ADJACENT COMPONENT SHORTS THIS IS ESPECIALLY IMPORTANT
ON THOSE NODULES 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 DEFECTED.
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS,
SOLDER SPLASHES OF SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL
LOOSE FOREIGN PARTICLES.
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORANN 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 MUST BE AVOIDED.
6. ALL CRlTICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTOR,
CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES. DO NOT
USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIAL OR MAKE
UNRECOMMENDED CIRCUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE STE ALWAYS PERFORM AN A.C. LEAKAGE TEST ON
ALL EXPOSED METALLIC PARTS OF THE CABINET. (THE CHANEL SELECTOR KNOB,
ANTENNA TERMINALS, HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO
OPERATE WITHOUT DANCER OF ELECTRICAL SHOCK. DO 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 .75 MFD. 150V A.C.
TYPE CAPACITOR BETWEEN A KNOWN 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 MEASUREMENTS
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 CORRECTED IMMEDIATELY
SUBJECT : 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 SUFFICIENT
MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQULATERAL TRIANGLE
IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE
PRESENCE OF IMPORTANT SAFETY INFORMATION ON SERVICE
LITERATURE.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND AND INSTRUCTIONS TO ALL SERVICE PERSONNEL
COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENIAL SOURCE OF X-RAYS
IN CURRENT TV RECEIVERS IS THE PICTURE TUBE HOWEVER, THIS TUBE DOES
NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIEDLEVEL
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 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.
AIWAYS RE-INSTALL THEM.
3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND
RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE METER SHOULD BE
CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD. SUCH AS THE ONE
AVAlLABLE AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO
POSSIBLITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR 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 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 PROOUCT
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 DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRA
IMPLOSION PROTECTION SYSTEM BUT CARE SHOULD BE TAKEN TO AVOID
IAMAGE 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-lN RECESS, CUBBYHOLE OR
CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH
OF HEAIED AIR FLOW.
2. AVOID CONDlTIONS OF HIGH HUMIDITY SUCH AS : OUTDOOR PAT10 INSTALLAIONS
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 OBSTRUCTS VENTILATION
4. WALL AHD 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 EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW
ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT
TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED
INSTALLATIONS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING
SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED.
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 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 TELEVISTION RECEIVER OR GENERICALLY APPROVED FOR
USE WITH TV.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 SINGLE OUTLET CAN LEAD TO
DISASTROUS CONSEQUENCES TO HOME AND FAMILY.
2
Improtant Service Notes
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO - VIDEO PRODUCTS
CAUTION :
Do not attempt to modify this product in any way Unauthorized modifications will
not only void the warranty, but may lead to your being liable for any resulting property damage
or user Injury. Service work should be performed only afters you are thoroughly familiar with all
of the following safety checks and servicing guidelines. To do otherwise, increases the risk of
potential hazards 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 HAZARD
1. Be sure that all components are positioned in such a way as to avoid possibility of adjacent
component 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, strein reliefs, and other hardware have been reinstalled per original design.
3. Soldering must be inspected to discover possible cold solder joints 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 metalsurfaces must be avoided.
6. All critical components such as fuses, flameproof resistors, capacitor, etc must be replaced
with exact factory types. Do not use replacement components other than those specified or
make unrecommended circuit modifications.
7. After re-assembly of the set always perform an A.C. leakage test on all exposed metallic
parts of the cabinet, (the channel selector knob, antenna terminals, handle and screws) to
be sure the set is safe to operate without danger of electrical shock. Do 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 ( 9 water 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 MFD capacitor. Reverse the A.C plug and
repeat A.C. voltage measurements for each exposed metallic 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 constitutes a potential shock hazard and must be corrected immediately
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 presence of important safety information
in service literature.
Fuse symbol is printed on pcb adjacent to the fuse, with "RISK OF FIRE
REPLACE FUSE AS MARKED". The symbol is explained in the service
manual with the following wording or equivalent.
"
CAUTION :
WITH SAME TYPE (6.3A, 250V)" and "ATTENTION : AFIN D'ASSU UNE PROTECTION
PERMANENTE CONTRE LES RISQUES D'INCENDIE, REMPLACER UNIQUEMENT PAR
UN FUSIBLE 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. Always re-install 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 possibility of an X-radiation
problem. Every time a color 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 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 diagrams(where used).
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY
SUBJECT : IMPLOSION
1. All direct viewed picture tubes are equipped with an integeral 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.
SUBJECT : TIPS ON PROPER INSTALLATION
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 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 commercial mounting kit, must follow the
factoryapproved 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 mounting 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 harzards 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.
Input voltageAC110 ~ 220V
Power consumption140W130W158W140W130W
Speaker impedance8 OHM
MTS systemZenith
R : 7.5W
Sound output power
(100% modulation)
WOOFER : 10WXWOOFER : 10WX
Receiving channels
(181ch)
A5-A1, A-W, W+1-W+84, 5A
L : 7.5W
VHF : 2 ~ 13
UHF : 14 ~ 69
RF impedance75 OHM
Screen size68 Cm
Remote controlR-37C04R-37C05R-37C04R-37C05
4 : 3
Screen aspect
16 : 9
Width : 843mm
Dimension
Weight56kg
Height : 592mm
Depth : 504mm
4
3. Alignment Instructions
POWER
MUTE
TV/VIDEO
ADD/ERASE
How to enter into Service Mode
1
RECALL
STOP
P
A
R
E
W
O
P
R
C
V
W
E
R
100
MTS
U
S
E
PLAY
F
F
W
SLEEP
/
S
T
I
L
L
Direct the remote control to the reception window of TV
2
Push buttons of remote control in sequece.
1 MUTE RECALL MUTE
3
then, the screen will appear as followws.
* Service Mode *
1 - HEAT RUN 7 - PIP CON
2 - SCREEN 8 - WHT BAL
3 - VOL CHK 9 - D.P. CON
4 - PIC CHK 0 - FUN CHK
5 - PIC CON 100 - ABL
6 - GEOMETR * - EX FACT
CHANNEL
MENU
SOUND
SURROUND
CHANNEL
SOUND
DIGITAL
SENSOR
R-37C04
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 completed each of all
service menu.
5
Alignment Instructions
CN-789S EEPROM DATA
KEYCONTENTS29U9FSO29U9FS29U9FSAKEYCONTENTS29U9FSO29U9FS29U9FSA
S1HEAT-RUN=>AUTO ON=>NORMALS7-1TWIN ON/OFF
S2HORIZENTAL LINE => NORMALP1 PIP A H-POS7
100Hz2119157P6 MAIN V-POS2
300Hz14171515P7 PIP A V-POS3
1K9131314S7-2Y-GAIN9
3K14171512PIP COLOR8
102118118PIP TINT6
VOLUMEMINPEDEST U4
5
VOLUMEMAXPEDEST V6
6
7
VOLUMECENTERDC TRAN0
S-TRACOFFS8-1G-DRIVE63
WHITE PEAKONB-DRIVE63
COLOR R0R-BIAS127
COLOR LIMITONG-BIAS70
Y RONB-BIAS70
GP-PHASEOFFC SYSTEMON
R-Y PHASE1OSD7
R-Y AMPLI1S8-2V-DLY2
Y DELAYOFFH-DLY64
VM GAIN0H-POS6