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V752UK


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                 FILE NO. 120-200211




SERVICE MANUAL



VIDEO CASSETTE RECORDER
V-752UK




                            FEB, 2002
        TOTAL CONTENTS




1. Precautions

2. Reference Information

3. Product Specifications

4. Disassembly and Reassembly

5. Alignment and Adjustment

6. Exploded View

7. Replacement Parts List

8. Block Diagram

9. PCB Diagrams

10. Schematic Diagrams
1. Precautions
1. Be sure that all of the built-in protective devices are
   replaced. Restore any missing protective shields.                                                    (READING SHOULD
                                                                                                          NOT BE ABOVE
                                                                                                             0.5mA)
                                                                                              LEAKAGE
2. When reinstalling the chassis and its assemblies, be              DEVICE                   CURRENT
                                                                     UNDER                     TESTER
   sure to restore all pretective devices, including :                TEST
   control knobs and compartment covers.
                                                                                 TEST ALL
                                                                              EXPOSED METER
3. Make sure that there are no cabinet openings                                 SURFACES
   through which people--particularly children                           2-WIRE CORD
   --might insert fingers and contact dangerous
   voltages. Such openings include the spacing                         ALSO TEST WITH                       EARTH
                                                                        PLUG REVERSED                      GROUND
   between the picture tube and the cabinet mask,                    (USING AC ADAPTER
                                                                      PLUG AS REQUIRED)
   excessively wide cabinet ventilation slots, and
   improperly fitted back covers.
                                                                                Fig. 1-1 AC Leakage Test
  If the measured resistance is less than 1.0 megohm
  or greater than 5.2 megohms, an abnormality exists         7. Antenna Cold Check :
  that must be corrected before the unit is returned            With the unit's AC plug disconnected from the
  to the customer.                                              AC source, connect an electrical jumper across the
                                                                two AC prongs. Connect one lead of the ohmmeter
4. Leakage Current Hot Check (See Fig. 1-1) :                   to an AC prong.
   Warning : Do not use an isolation transformer                Connect the other lead to the coaxial connector.
   during this test. Use a leakage current tester or a
   metering system that complies with American               8. High Voltage Limit :
   National Standards Institute (ANSI C101.1,                   High voltage must be measured each time
   Leakage Current for Appliances), and Underwriters            servicing is done on the B+, horizontal deflection
   Laboratories (UL Publication UL1410, 59.7).                  or high voltage circuits.

5. With the unit completely reassembled, plug the AC           Heed the high voltage limits. These include the
   line cord directly the power outlet. With the unit's        X-ray protection Specifications Label, and the
   AC switch first in the ON position and then OFF,            Product Safety and X-ray Warning Note on the
   measure the current between a known erath                   service data schematic.
   ground (metal water pipe, conduit, etc.) and all
   exposed metal parts, including : antennas, handle         9. Some semiconductor ("solid state") devices are
   brackets, metal cabinets, screwheads and control             easily damaged by static electricity.
   shafts. The current measured should not exceed               Such components are called Electrostatically
   0.5 milliamp. Reverse the power-plug prongs in the           Sensitive Devices (ESDs); examples include
   AC outlet and repeat the test.                               integrated circuits and some field-effect transistors.
                                                                The following techniques will reduce the
6. X-ray Limits :                                               occurrence of component damage caused by static
   The picture tube is designed to prohibit X-ray               electricity.
   emissions. To ensure continued X-ray protection,
   replace the picture tube only with one that is the        10. Immediately before handling any semiconductor
   same type as the original.                                    components or assemblies, drain the electrostatic
                                                                 charge from your body by touching a known
                                                                 earth ground. Alternatively, wear a discharging
                                                                 Wrist-strap device. (Be sure to remove it prior to
                                                                 applying power--this is an electric shock
                                                                 precaution.)




Toshiba                                                                                                                   1-1
Precautions


11. High voltage is maintained within specified limits    18. Picture Tube Implosion Warning :
    by close-tolerance, safety-related components and         The picture tube in this receiver employs
    adjustments. If the high voltage exceeds the              "integral implosion" protection. To ensure
    specified limits, check each of the special               continued implosion protection, make sure that
    components.                                               the replacement picture tube is the same as the
                                                              original.
12. Design Alteration Warning :
    Never alter or add to the mechanical or electrical    19. Do not remove, install or handle the picture tube
    design of this unit. Example : Do not add                 without first putting on shatterproof goggles
    auxiliary audio or video connectors.                      equipped with side shields. Never handle the
    Such alterations might create a safety hazard.            picture tube by its neck. Some "in-line" picture
    Also, any design changes or additions will void           tubes are equipped with a permanently attached
    the manufacturer's warranty.                              deflection yoke; do not try to remove such
                                                              "permanently attached" yokes from the picture
13. Hot Chassis Warning :                                     tube.
    Some TV receiver chassis are electrically
    connected directly to one conductor of the AC         20. Product Safety Notice :
    power cord. If an isolation transformer is not            Some electrical and mechanical parts have special
    used, these units may be safely serviced only if          safety-related characteristics which might not be
    the AC power plug is inserted so that the chassis         obvious from visual inspection. These safety
    is connected to the ground side of the AC source.         features and the protection they give might be
                                                              lost if the replacement component differs from the
      To confirm that the AC power plug is inserted           original--even if the replacement is rated for
      correctly, do the following : Using an AC               higher voltage, wattage, etc.
      voltmeter, measure the voltage between the
      chassis and a known earth ground. If the reading       Components that are critical for safety are
      is greater than 1.0V, remove the AC power plug,        indicated in the circuit diagram by shading,
      reverse its polarity and reinsert. Re-measure the      (     or     ).
      voltage between the chassis and ground.                Use replacement components that have the same
                                                             ratings, especially for flame resistance and
14. Some TV chassis are designed to operate with 85          dielectric strength specifications. A replacement
    volts AC between chassis and ground, regardless          part that does not have the same safety
    of the AC plug polarity. These units can be safely       characteristics as the original might create shock,
    serviced only if an isolation transformer inserted       fire or other hazards.
    between the receiver and the power source.

15. Never defeat any of the B+ voltage interlocks.
    Do not apply AC power to the unit (or any of its
    assemblies) unless all solid-state heat sinks are
    correctly installed.

16. Always connect a test instrument's ground lead to
    the instrument chassis ground before connecting
    the positive lead; always remove the instrument's
    ground lead last.

17. Observe the original lead dress, especially near
    the following areas : Antenna wiring, sharp
    edges, and especially the AC and high voltage
    power supplies. Always inspect for pinched, out-
    of-place, or frayed wiring. Do not change the
    spacing between components and the printed
    circuit board. Check the AC power cord for
    damage. Make sure that leads and components
    do not touch thermally hot parts.



1-2                                                                                                       Toshiba
Toshiba
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                                Front Controls:                                                                                                   Rear Connections:
                                                                                                                                                                                                                                                                2-1 Operation of Controls


                        (V-752UK)                                                                                                                (V-752UK/V-632UK/V-252UK)
                                                                                                                                                                                                                                                                                            2. Reference Information




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