Toshiba FT-3808BK, Service Manual

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CONTENTS
SAFETY PRECAUTIONS-------------------------------------------------------------------------- 1
OPERATING CONTROLS ------------------------------------------------------------------------ 2
ALIGNMENT PROCEDURE --------------------------------------------------------------------- 4
BLOCK DIAGRAM ------------------------------------------------------------------------------- 11
SCHEMATIC DIAGRAMS ---------------------------------------------------------------------- 13
TROUBLESHOOTING HINTS ------------------------------------------------------------------ 15
FREQUENCY CHART ---------------------------------------------------------------------------- 21
IC AND TRANSISTOR VOLTAGE CHART ------------------------------------------------- 22
SEMICONDUCTOR LEAD IDENTIFICATION --------------------------------------------- 28
ELECTRICAL PARTS LOCATION ------------------------------------------------------------ 30
WIRING DIAGRAMS -----------------------------------------------------------------------------3 2
EXPLODED VIEW AND MECHANICAL PARTS LIST ---------------------------------- 34
COMPONENT LIST -------------------------------------------------------------------------------3 8
PACKING PARTS LIST---------------------------------------------------------------------------5 4
SPECIFICATIONS ---------------------------------------------------------------------------------5 5
SAFETY PRECAUTIONS
Before returning any TOSHIBA FT-3808BK 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 manufacturer has 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
speaker jacks, switches, grounding, active or passive circuitry, etc. may alter the safety
characteristics of these models and potentially create a hazardous situation for the user.
Any design alterations or additions will void the manufacturer’s warranty and will further
relieve the manufacturer of responsibility for personal injury or property damage resulting
therefrom.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special characteristics. These
characteristics often pass unnoticed and the protection afforded by them cannot necessarily
be obtained by using replacement component rated for higher voltage, wattage, etc.
Replacement parts that have these special safety characteristics are identified in this
manual and its supplements; electrical components having such features are identified by a
! in the schematic diagram and the parts list. Before replacing any of these components
read the parts list in this manual carefully. The use of substitute replacement parts that do
not have the same safety characteristics as specified in the parts list may create shock, fire
or other hazards.