Toshiba FT-8901 Service Manual

Also see for FT-8901: Owner's manual

— 1 —CONTENTSSAFETY PRECAUTIONS ...................................................................................................................... 1OPERATING CONTROLS ..................................................................................................................... 2ANSWERING MACHINE ....................................................................................................................... 3ALIGNMENT PROCEDURE .................................................................................................................. 4BLOCK DIAGRAMS ............................................................................................................................... 8SCHEMATIC DIAGRAMS .................................................................................................................... 10TROUBLESHOOTING HINTS ............................................................................................................. 14IC AND TRANSISTOR VOLTAGE CHART ......................................................................................... 21SEMICONDUCTOR LEAD IDENTIFICATION ..................................................................................... 26ELECTRICAL PARTS LOCATION ...................................................................................................... 28WIRING DIAGRAMS............................................................................................................................ 30EXPLODED VIEW AND MECHANICAL PARTS LIST ........................................................................ 32PARTS LIST......................................................................................................................................... 34ASSEMBLY PARTS LIST .................................................................................................................... 46SPECIFICATIONS ............................................................................................................................... 47SAFETY PRECAUTIONSBefore returning any models to the customer, a safety check of the entire instrument should be made.The service technician must be sure that no protective device built into the instrument by the manufacturerhas become defective or inadvertently degraded during servicing.1. WARNING:Alterations of the design or circuitry of these models should not be made.Any design changes or additions such as, but not limited to, circuit modifications, auxiliary speakerjacks, switches, grounding, active or passive circuitry, etc. may alter the safety characteristics of thesemodels and potentially create a hazardous situation for the user.Any design alterations or additions will void the manufacturer’s warranty and will further relieve themanufacturer of responsibility for personal injury or property damage resulting therefrom.2. PRODUCT SAFETY NOTICEMany electrical and mechanical parts in this chassis have special characteristics. These characteristicsoften pass unnoticed and the protection afforded by them cannot necessarily be obtained by usingreplacement components rated for higher voltage, wattage, etc. Replacement parts that have thesespecial safety characteristics are identified in this manual and its supplements; electrical componentshaving such features are identified by a in the schematic diagram and the parts list. Before replacingany of these components, read the parts list in this manual carefully. The use of substitute replacementparts that do not have the same safety characteristics as specified in the parts list may create shock, fireor other hazards.