Sanyo DS27800 27" TV

AS FILE NO. SERVICE MANUAL

Remote Control Color Television

DS27800

(U.S.A.) (CANADA)

ORIGINAL VERSION

Chassis No. 27800-00

NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual. If the Original Version Service Manual Chassis No. does not match the unit’s, additional Service Literature is required. You must refer to “Notices” to the Original Service Manual prior to servicing the unit.

Contents

Specifications

Safety Instructions . . . . . . . . . . . . . . . . . . 2 Service Adjustments . . . . . . . . . . . . . . 3 - 8 Service Hints . . . . . . . . . . . . . . . . . . . . . . . 9 Mechanical Disassemblies. . . . . . . . . . . 10 Chassis Electrical Parts List . . . . . . 11 - 21 Cabinet Parts List . . . . . . . . . . . . . . . . . . 22 Component and Test Point Locations . . . . . . . . . . . . . . . . . . . 23 - 24 Schematic Insert . . . . . . . . . . . . . . . 25 - 32 Schematic Notes . . . . . . . . . . . . . . . . . 25 Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25 Capacitor and Resistor Codes . . . . . . 25 Block Diagram . . . . . . . . . . . . . . . 26 - 27 Voltage Charts . . . . . . . . . . . . . . . 26 - 28 Waveforms. . . . . . . . . . . . . . . . . . . . . . 28 Schematic Diagrams . . . . . . . . . . 29 - 32

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz 86W (Avg), 2.5A (Max) Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω UHF/VHF/CATV Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF), 14 - 69 (UHF), 01, 14-94, 95-125 (CATV) Remote Ready . . . . . . . . . . 38 Key Remote Control Sound Output . . . . . . . . . . . . . . . . . . . . . . 3.0 W/CH Intermediate Frequency Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz Picture Tube . . . . . . . . . . . . . . . . . . . A68AJB82X04 Semiconductors Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . 13 Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Except within Tuner and RC Pre-Amp. Cabinet Dimensions Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664mm Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629mm Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503mm

DS27800, G5MRM, PRODUCT CODE 111336193

REFERENCE No. SM780069

SAFETY INSTRUCTIONS SAFETY PRECAUTIONS WARNING: The chassis of this receiver has a floating ground with the potential of one half the AC line voltage in respect to earth ground. Service should not be attempted by anyone not familiar with the precautions necessary when working on this type of equipment. The following precautions must be observed: 1. An isolation transformer must be connected in the power line between the receiver and the AC line before any service is performed on the receiver. 2. Comply with all caution and safety-related notes provided on the side of the cabinet, inside the cabinet, on the chassis, and the picture tube. 3. When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly, such as control knobs, adjustment covers, shields and barriers. DO NOT OPERATE THIS TELEVISION RECEIVER WITHOUT THE PROTECTIVE SHIELD IN POSITION AND PROPERLY SECURED. 4. Before replacing the back cover of the set, thoroughly inspect the inside of the cabinet to see that no stray parts or tools have been left inside. Before returning any television to the customer, the service technician must perform the following safety checks to be sure that the unit is completely safe to operate without danger of electrical shock.

ANTENNA COLD CHECK Remove AC plug from the 120 VAC outlet and place a jumper across the two blades. Connect one lead of an ohmmeter to the jumpered AC plug, and touch the other lead to each exposed antenna terminal (UHF and VHF antenna terminals). The resistance must measure between 1M ohm and 5.2M ohm. Any resistance value below or above this range indicates an abnor