Service Manuals, User Guides, Schematic Diagrams or docs for : ZENITH TV MX474C chassis ZENITH+H13A02+MX474C

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ZENITH+H13A02+MX474C


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      SERVICE MANUAL                                                                            Model Series:

        Product Type:    Color TV                                                                 H13A02D
        Chassis:         MX474C                                                                   H13A02X
        Manual Series:   CM153
        Manual Part #:   923-03459
        Model Line:      D
        Product Year:    2001




                                                CONTENTS
                          General Information ....................................... 1
                          Servicing ..................................................... 2
                          Parts ........................................................... 3
                          Exploded views ............................................. 4
                          Schematics ................................................... 5




                               Published by Technical Publications
                                 Zenith Electronics Corporation
                    201 James Record Road - Huntsville, Alabama 35824-1513
Printed in U.S.A.
CN DG 5k                 Copyright      October 2001 by Zenith Electronics Corporation
       PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service                                             A.C. Voltmeter
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from Zenith Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.                                                 0.16uF
These components are indicated by the letter "x" included in their component                                                                         Place this probe
                                                                                             Good Earth Ground
designators and are required to maintain safe performance. No deviations are                                                                         on each exposed
                                                                                             such as the Water
allowed without prior approval by Zenith Electronics Corporation.                                                             1600 OHM               metal part.
                                                                                             Pipe, Conduit, etc.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into                                                  10 WATT
the set is not delayed until the new service literature is printed.

Caution: Do not attempt to modify this product in any way. Never perform                X-RADIATION
customized installations without manufacturer's approval. Unauthorized                  1.   Be sure procedures and instructions to all service personnel cover the
modifications will not only void the warranty, but may lead to property damage               subject of x-radiation. The only potential source of x-rays in current TV
or user injury.                                                                              receivers is the picture tube. However, this tube does not emit x-rays when
                                                                                             the HV is at the factory-specified level. The proper value is given in the
Service work should be performed only after you are thoroughly familiar with
                                                                                             applicable schematic. Operation at higher voltages may cause a failure of
these safety checks and servicing guidelines.
                                                                                             the picture tube or high-voltage supply and, under certain circumstances
                                                                                             may produce radiation in excess of desirable levels.
Graphic symbols
                                                                                        2.   Only factory-specified CRT anode connectors must be used.
              The exclamation point within an equilateral triangle is intended
              to alert the service personnel to important safety information in         3.   It is essential that the service personnel have available an accurate and
              the service literature.                                                        reliable high-voltage meter.

              The lightning flash with arrowhead symbol within an equilateral           4.   When the high-voltage circuitry is operating properly, there is no possibility
              triangle is intended to alert the service personnel to the presence            of an x-radiation problem. Every time a color chassis is serviced, the
              of noninsulated "dangerous voltage" that may be of sufficient                  brightness should be run up and down while monitoring the high voltage
              magnitude to constitute a risk of electric shock.                              with a meter, to be certain that the high voltage does not exceed the
                                                                                             specified value and that it is regulating correctly.
              The pictorial representation of a fuse and its rating within an
                                                                                        5.   When troubleshooting and making test measurements in a product with a
              equilateral triangle is intended to convey to the service personnel
                                                                                             problem of excessively high voltage, avoid being unnecessarily close to
              the following fuse replacement caution notice:
                                                                                             the picture tube and the high voltage power supply. Do not operate the
              CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
                                                                                             product longer than necessary to locate the cause of excessive voltage.
              REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED
              NEAR EACH FUSE.                                                           6.   Refer to HV, B+, and shutdown adjustment procedures described in the
                                                                                             appropriate schematics and diagrams (where used).
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.        IMPLOSION
After the original service problem has been corrected, make a check of the              1.   All direct view picture tubes are equipped with an integral implosion
following:                                                                                   protection system; take care to avoid damage during installation.
                                                                                        2.   Use only the recommended factory replacement tubes.
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of                 TIPS ON PROPER INSTALLATION
    adjacent component shorts. This is especially important on items trans-             1.   Never install any receiver in a closed-in recess, cubbyhole, or closely
    ported to and from the repair shop.                                                      fitting shelf space over, or close to, a heat duct, or in the path of heated
2. Verify that all protective devices such as insulators, barriers, covers,                  air flow.
   shields, strain reliefs, power supply cords, and other hardware have been            2.   Avoid conditions of high humidity such as: outdoor patio installations
   reinstalled per the original design. Be sure that the safety purpose of the               where dew is a factor, near steam radiators where steam leakage is a factor,
   polarized line plug has not been defeated.                                                etc.
3. Soldering must be inspected to discover possible cold solder joints, solder          3.   Avoid placement where draperies may obstruct venting. The customer
   splashes, or sharp solder points. Be certain to remove all loose foreign                  should also avoid the use of decorative scarves or other coverings that
   particles.                                                                                might obstruct ventilation.
4. Check for physical evidence of damage or deterioration to parts and compo-           4.   Wall- and shelf-mounted installations using a commercial mounting kit
   nents, for frayed leads or damaged insulation (including the AC cord), and                must follow the factory-approved mounting instructions. A product mounted
   replace if necessary.                                                                     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
5. No lead or component should touch a receiving tube or a resistor rated at                 or screws used for fasteners must not touch any parts or wiring. Perform
   1 watt or more. Lead tension around protruding metal surfaces must be                     leakage tests on customized installations.
   avoided.
                                                                                        5.   Caution customers against mounting a product on a sloping shelf or in a
6. After re-assembly of the set, always perform an AC leakage test on all exposed            tilted position, unless the receiver is properly secured.
   metallic parts of the cabinet (the channel selector knobs, antenna terminals,
                                                                                        6.   A product on a roll-about cart should be stable in its mounting to the cart.
   handle and screws) to be sure that set is safe to operate without danger of
                                                                                             Caution the customer on the hazards of trying to roll a cart with small
   electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
                                                                                             casters across thresholds or deep pile carpets.
   TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in
   the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by            7.   Caution customers against using a cart or stand that has not been listed
   a .15 mfd 150V AC type capacitor between a known good earth ground                        by Underwriters Laboratories, Inc. for use with its specific model of
   water pipe, conduit, etc.) and the exposed metallic parts, one at a time.                 television receiver or generically approved for use with TVs of the same or
   Measure the AC voltage across the combination of 1500 ohm resistor and                    larger screen size.
   .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor              8.   Caution customers against using extension cords. Explain that a forest of
   and repeat AC voltage measurements for each exposed metallic part. Voltage                extensions, sprouting from a single outlet, can lead to disastrous
   measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp                 consequences to home and family.
   AC. Any value exceeding this limit constitutes a potential shock hazard and
   must be corrected immediately.

                                                                                    i
                                                            TABLE OF CONTENTS
SECTION 1               GENERAL INFO / REMOTE CONTROL
SPECIFICATIONS .......................................................... 1-1

SECTION 2               SERVICING
DISASSEMBLY INSTRUCTION .......................................... 2-1
SERVICE MODE LIST ..................................................... 2-3
ALIGNMENT INSTRUCTION ............................................. 2-4
ELECTRICAL ADJUSTMENT ............................................. 2-4
MAJOR COMPONENTS LOCATION GUIDE ........................... 2-7

SECTION 3               EXPLODED VIEW
EXPLODED VIEW .......................................................... 3-1

SECTION 4               PARTS LIST
COMPONENT PARTS LIST ............................................... 4-1

SECTION 5               SCHEMATIC
H13A02D/02X       POWER SUPPLY CIRCUIT ........................... 5-1
H13A02D/02X       DEFLECTION CIRCUIT ............................... 5-2
H13A02D/02X       MAIN MICRO & TUNER CIRCUIT .................. 5-3
H13A02D/02X       CHROMA CIRCUIT .................................... 5-4
H13A02D/02X       AUDIO CIRCUIT ....................................... 5-5
H13A02D/02X       PCB LAYOUT TOP ..................................... 5-6
H13A02D/02X       PCB LAYOUT BOTTOM ............................... 5-7




CM153                                                                           TOC   MX474C - TOC
SPECIFICATIONS


                 MODEL
                                   H13A02D / H13A02X                   REMARKS
ITEMS
TV STANDARD                               NTSC-M
POWER INPUT                            AC 120V 60 Hz
POWER CONSUMPTION                            54W
TUNING SYSTEM             Frequency Synthesizer ( FS ) Tuning System
                                    VHF : 2 ~ 13 (12)
TUNING RANGES                       UHF : 14 ~ 69 (56)
                                   CATV : 1 ~ 181 (181)
SOUND OUTPUT                               1.0 W

SPEAKER                                 1 W 8 ohm

ANTENNA INPUT IMPEDANCE              75 ohm Unbalanced
                                          Front :
AUXILIARY                             Ear Phone Jack
INPUT TERMINAL                            Rear:
                                   VHF/UHF Antenna Input

INTERMEDIATE               Picture IF Carrier Frequency : 45.75 MHz
                           Sound IF Carrier Frequency : 41.25 MHz
FREQUENCIES




REMARKS




    CM153                                   1-1                         MX474C - GENERAL INFO
                                               SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 1 second.

    Set Key       Remocon Key                                                    Operations

  VOL. (-) MIN           0            Releasing of V-CHIP PASSWORD.


                                      Initialization of the factory.
  VOL. (-) MIN           1
                                      NOTE: Do not use this for the normal servicing.

                                      POWER ON total hours is displayed on the screen.
                                      Refer to the "CONFIRMATION OF USING HOURS".
  VOL. (-) MIN           6
                                      Can be checked of the INITIAL DATA of MEMORY IC.
                                      Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".

                                      Writing of EEPROM initial data.
  VOL. (-) MIN           8
                                      NOTE: Do not use this for the normal servicing.

                                      Display of the Adjustment MENU on the screen.
  VOL. (-) MIN           9
                                      Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).




                                    CONFIRMATION OF USING HOURS
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
                                                                              ADDRESS    DATA
1. Set the VOLUME to minimum.
2. Press both VOL. DOWN button on the set and Channel                  INIT     00       83           Initial setting content of MEMORY IC.
   button (6) on the remote control for more than 1 second.
3. After the confirmation of using hours, turn off the power.          CRT ON           0010          POWER ON total hours.
                                                                                                       = (16 x 16 x 16 x thousands digit value)
                                                                                                       + (16 x 16 x hundreds digit value)
                                                                                                       + (16 x tens digit value)
                                                                              FIG. 1                   + (ones digit value)



                             NOTE FOR THE REPLACING OF MEMORY IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.


                                                                 Table 1

                                         INI   INI   INI   INI   INI   INI     INI      INI     INI   INI   INI
                          ADDRESS
                                         00    01    02    03    04    05      06       07      08    09    0A
                             DATA        08    09    A0    01     06   B3       24      99      21    25    FF



1. Enter DATA SET mode by setting VOLUME to minimum.
2. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.
   ADDRESS and DATA should appear as FIG 1.
3. ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until
   required ADDRESS to be changed is reached.
4. Press ENTER to select DATA. When DATA is selected, it will "blink".
5. Again, step through the DATA using SET + or - until required DATA value has been selected.
6. Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7. Repeat steps 3 to 6 until all data has been checked.
8. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
The unit will now have the correct DATA for the new MEMORY IC.


          CM153                                                        2-1                                                  MX474C - SERVICING
                                                        ALIGNMENT INSTRUCTIONS

1. SERVICE MODE ADJUSTMENS
      Follow the steps below whenever service adjustment is required. See Table- A and Table- B to determine if
      service adjustm ents are required.
NOTE
T o\ p e r f o r m   the service mode for model H13A02D/02X, please perform the following steps on part OS101.
       1) R e m o t e c o n t r o l P N # 9 2 4 - 1 0 0 5 3 i s n e e d e d t o c o m p l e t e t h e f o l l o w i n g .
       2) Remo ve 3pi n te rm ina l at loc at io n OS101 and ad d IR se n so r PN# 942-10065.
       3) E nter th e S e rv ic e m ode an d adjus t.
       4) Remo ve IR pre A m p after all menu ad ju stm ents have been com p le te d.


      1) How to enter the service mode using your remote control.
         



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