Service Manuals, User Guides, Schematic Diagrams or docs for : TOSHIBA TV 44hm85 Toshiba_44HM85_s.m

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Toshiba_44HM85_s.m


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                                    FILE NO. 050-200534




     SERVICE MANUAL


    Projection Television
                                 44HM85




TOSHIBA CORPORATION 2005   -1-    Published in Japan, Sep. 2005 (YC)
                                                                TABLE OF CONTENTS

SAFETY PRECAUTIONS ........................................................................................................................................................... 3
SPECIFICATIONS ....................................................................................................................................................................... 4
DESCRIPTION OF CONTROLS ................................................................................................................................................. 5
ADJUSTMENT INSTRUCTION ................................................................................................................................................ 12
EXPLODED VIEW .................................................................................................................................................................... 16
REPLACEMENT PARTS LIST .................................................................................................................................................. 17
PC BOARDS TOP & BOTTOM VIEW ....................................................................................................................................... 32
BLOCK DIAGRAM .................................................................................................................................................................... 39
SCHEMATIC DIAGRAM ............................................................................................................................................................ 43




                                                                                       -2-
                                               SAFETY PRECAUTIONS


                                             IMPORTANT SAFETY NOTICE
 Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified
 by in the Schematic Diagram and Replacement Parts List.
 It is essential that these special safety parts should be replaced with the same components as recommended in this
 manual to prevent Shock, Fire, or other Hazards.
 Do not modify the original design without permission of manufacturer.


General Guidance                                                      Leakage Current Hot Check (See below Figure)
                                                                      Plug the AC cord directly into the AC outlet.
An lsolation Transformer should always be used during the             Do not use a line Isolation Transformer during this
servicing of a receiver whose chassis is not isolated from the        check.
AC power line. Use a transformer of adequate power rating as          Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
this protects the technician from accidents resulting in personal     between a known good earth ground (Water Pipe, Conduit, etc.)
injury from electrical shocks.                                        and the exposed metallic parts.
                                                                      Measure the AC voltage across the resistor using AC
It will also protect the receiver and it's components from being      voltmeter with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitary that may be            Reverse plug the AC cord into the AC outlet and repeat AC
inadvertently introduced during the service operation.                voltage measurements for each esposed metallic part. Any
                                                                      voltage measured must not exceed 0.75 volt RMS which is
If any fuse (or Fusible Resistor) in this monitor is blown, replace   corresponds to 0.5mA.
it with the specified.                                                In case any measurement is out of the limits sepcified, there
                                                                      is possibility of shock hazard and the set must be checked
When replacing a high wattage resistor (Oxide Metal Film              and repaired before it is returned to the customer.
Resistor, over 1W), keep the resistor 10mm away from PCB.
                                                                      Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
                                                                                             AC Volt-meter



Leakage Current Cold Check(Antenna Cold Check)                                                                   Good Earth Ground
With the instrument AC plug removed from AC source, connect                                                      such as WATER PIPE,
an electrical jumper across the two AC plug prongs.                                                              CONDUIT etc.
                                                                        To Instrument's
Place the AC switch in the on positioin, connect one lead of                                       0.15uF
                                                                        exposed
ohm-meter to the AC plug prongs tied together and touch other           METALLIC PARTS
ohm-meter lead in turn to each exposed metallic parts such
as antenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis,                                 1.5 Kohm/10W
the measured resistance should be between 1M and 5.2M.
When the exposed metal has no return path to the chassis
the reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.




                                                                      TOSHIBA OF CANADA LTD.
                                                                      191 McNABB STREET, MARKHAM.
                                                                      ONTARIO, L3R 8H2, CANADA
                                                                      TEL : (905)470-5400




                                                                  -3-
                                                SPECIFICATIONS

Product Specifications






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