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SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ......... 1-3
SERVICING PRECAUTIONS .................................................................................. 1-4
SERVICE INFORMATION FOR EEPROM IC SETTING ........................................ 1-5
SPECIFICATIONS ................................................................................................... 1-6
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, SUBJECT : X-RADIATION
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-
TURER'S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
RESULTING PROPERTY DAMAGE OR USER INJURY. TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-
CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
USER. CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC- ABLE LEVELS.
TION FROM A.C. LINE SHOCK. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE
USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN
SAFETY CHECKS COLOR SETS, ALWAYS RE-INSTALL THEM.
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A 3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN
CHECK SHOULD BE MADE OF THE FOLLOWING. ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA
SUBJECT : FIRE & SHOCK HAZARD TION OF THE METER SHOULD BE CHECKED PERIODICALLY
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE
AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. AT YOUR DISTRIBUTOR.
THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY
TRANSPORTED TO AND FROM THE REPAIR SHOP. THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD
SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES
BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING
SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-
DEFEATED. NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON
SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. EACH CUSTOMER'S INVOICE.
BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,
TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND
INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS. LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR SIVE VOLTAGE.
A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
PROTRUNING METAL SURFACES MUST BE AVOIDED. DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF (WHERE USED).
RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT SUBJECT: IMPLOSION
FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS
OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR- 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE
CUIT MODIFICATIONS. GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE
TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN- 2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE SUBJECT : TIPS ON PROPER INSTALLATION
WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-
ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT- HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON- INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-
DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 OBSTRUCT VENTILATION.
VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK
CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED
HAZARD AND MUST BE CORRECTED IMMEDIATELY.
MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR
A.C. VOLTMETER 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.
GOOD EARTH GROUND PLACE THIS PROBE 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS
SUCH AS THE WATER ON EACH EXPOSED MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-
PIPE. CONDUIT. ETC METAL PART ARDS 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
SUBJECT: GRAPHIC SYMBOLS WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION
AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.'S OF
SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED THE SAME OR LARGER SCREEN SIZE.
"DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAG-
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN- GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO
GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO HOME AND FAMILY.
THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
1-3
SERVICING PRECAUTIONS
CAUTION : Before servicing the COMBI HOME THEATER Electrostatically Sensitive (ES) Devices
SYSTEM covered by this service data and its supplements Some semiconductor (solid state) devices can be damaged
and addends, read and follow the SAFETY PRECAUTIONS. easily by static electricity. Such components commonly are
NOTE : if unforeseen circumstances create conflict between called Electrostatically Sensitive (ES) Devices. Examples of
the following servicing precautions and any of the safety pre- typical ES devices are integrated circuits and some field
cautions in this publications, always follow the safety pre- effect transistors and semiconductor chip components.
cautions. The following techniques should be used to help reduce the
Remembers Safety First: incidence of component damage caused by static electricity.
General Servicing Precautions 1. Immediately before handling any semiconductor compo-
1. Always unplug the COMBI HOME THEATER SYSTEM AC nent or semiconductor-equipped assembly, drain off any
power cord from the AC power source before: electrostatic charge on your body by touching a known
(1) Removing or reinstalling any component, circuit board, earth ground. Alternatively, obtain and wear a commer-
module, or any other assembly. cially available discharging wrist strap device, which
(2) Disconnection or reconnecting any internal electrical should be removed for potential shock reasons prior to
plug or other electrical connection. applying power to the unit under test.
(3) Connecting a test substitute in parallel with an elec-
trolytic capacitor. 2. After removing an electrical assembly equipped with ES
Caution : A wrong part substitution or incorrect devices, place the assembly on a conductive surface such
polarity installation of electrolytic capacitors may result as aluminum foil, to prevent electrostatic charge buildup or
in an explosion hazard. exposure of the assembly.
2. Do not spray chemicals on or near this COMBI HOME 3. Use only a grouned-tip soldering iron to solder or unsolder
THEATER SYSTEM or any of its assemblies. ES devices.
3. Unless specified otherwise in this service data, clean 4. Use only an anti-static solder removal device. Some
electrical contacts by applying an appropriate contact solder removal devices not classified a "anti-static" can
cleaning solution to the contacts with a pipe cleaner, generate electrical charges sufficient to damage ES
cotton-tipped swab, or comparable soft applicator. devices.
Unless specified otherwise in this service data, lubrication
of contacts is not required. 5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
4. Do not defeat any plug/socket B+ voltage interlocks with devices.
whitch instruments covered by this service manual might
be equipped. 6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
5. Do not apply AC power to this COMBI HOME THEATER install it. (Most replacement ES devices are packaged with
SYSTEM and/or any of its electrical assemblies unless all leads electrically shorted together by conductive foam,
solid-state device heat sinks are cerrectly installed. aluminum foil, or comparable conductive material).
6. Always connect test instrument ground lead to the
appropriate ground before connection the test instrument 7. Immediately before removing the protective material from
positive lead. Always remove the test instrument ground the leads of a replacement ES device, touch the protective
lead last. material to the chassis or circuit assembly into which the
device will be installed.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn Caution : Be sure no power is applied to the chassis or
the power on. Connect an insulation resistance meter(500V) circuit, and observe all other safety precautions.
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces- 8. Minimize bodily motions when handling unpackaged
sible conductive parts (Note 1) should be more than 1M- replacement ES devices. (Normally harmless motion such
ohm. as the brushing together of your clothes fabric or the lifting
Note 1 : Accessible Conductive Parts including Metal pan- of your foot from a carpeted floor can generate static elec-
els, Input terminals, Earphone jacks, etc. tricity sufficient to damage an ES device.)
1-4
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. EXPLODED VIEWS ................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Woofer Speaker Section .........................................................................................................2-4
3. Speaker Section.......................................................................................................................2-5
4. Packing Accessory Section ....................................................................................................2-6
2-1
1
2
3
4
5
457 462
457
462
A00
250
A
264
262
457
A46B 265
463
462
A26 300
463
A48A
263
B
285
1. Cabinet and Main Frame Section
A46A
A46 A48
2-2
323 266
465
260 467
A42
276
A43 276B
EXPLODED VIEWS
320
C
280 DG
283 601
330
284 A49
452
277
452
OPTIONAL PART
D
2. Woofer Speaker Section (DTE-550WE)
OPTIONAL PART
851
854
860
856
861
855
859 853
857
863 862
2-4
3. Speaker Section (DTE-530TE)
850
858
851
852
859
853
854
855
856
2-5
4. Packing Accessory Section
810 CABLE SET ASS'Y, RF
811 PLUG ASS'Y 1WAY(YELLOW)
806 CABLE, COAXIAL
812 PLUG ASS'Y 2WAY
821 SCART CABLE
820 PLUG ASS'Y 1WAY(BLACK)
823 SCART JACK
822 CABLE, DIN
808 BATTERY
801 OWNER'S MANUAL
900 REMOCON
803A PACKING, CASING
803B PACKING, CASING
803C PACKING, CASING
804 SHEET
803 PACKING, CASING
802 BOX
OPTIONAL PARTS
SECTION 3
ELECTRICAL
CONTENTS
OVERALL BLOCK DIAGRAM.........................................................................................................................................................................................3-2
VCR PART
LECTRICAL ADJUSTMENT PROCEDURES ...........................................................................................................................................................3-3
ELECTRICAL TROUBLESHOOTING GUIDE ..........................................................................................................................................................3-4
1. Power(SMPS) Circuit.........................................................................................................................................................................................................3-4
2. SYSTEM/KEY CIRCUIT......................................................................................................................................................................................................3-6
3. SERVO CIRCUIT ................................................................................................................................................................................................................3-7
4. Y/C CIRCUIT .....................................................................................................................................................................................................................3-10
5. Hi-Fi CIRCUIT...................................................................................................................................................................................................................3-14
6. Tuner/IF CIRCUIT .............................................................................................................................................................................................................3-17
BLOCK DIAGRAMS ...........................................................................................................................................................................................................3-19
1. Power(SMPS) BLOCK DIAGRAM 1................................................................................................................................................................................3-19
2. Power(SMPS) BLOCK DIAGRAM 2................................................................................................................................................................................3-21
3. Tu/IF, NICAM & A2 BLOCK DIAGRAM ...........................................................................................................................................................................3-23
4. VPS BLOCK DIAGRAM ...................................................................................................................................................................................................3-24
5. Y/C BLOCK DIAGRAM ....................................................................................................................................................................................................3-25
6. Hi-Fi BLOCK DIAGRAM ..................................................................................................................................................................................................3-27
7. SYSTEM BLOCK DIAGRAM............................................................................................................................................................................................3-29
CIRCUIT DIAGRAMS.........................................................................................................................................................................................................3-31
1. Power(SMPS) CIRCUIT DIAGRAM 1 ..............................................................................................................................................................................3-31
2. Power(SMPS) CIRCUIT DIAGRAM 2 ..............................................................................................................................................................................3-33
3. TU/IF, NICAM & A2 CIRCUIT DIAGRAM.........................................................................................................................................................................3-35
4. A/V CIRCUIT DIAGRAM...................................................................................................................................................................................................3-37
5. Hi-Fi CIRCUIT DIAGRAM.................................................................................................................................................................................................3-39
6. SCART(JACK) CIRCUIT DIAGRAM ................................................................................................................................................................................3-41
7. SYSTEM CIRCUIT DIAGRAM..........................................................................................................................................................................................3-43
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