Hitachi HTA-DD1E Service Manual page 3

WARNING
Check that exposed parts are acceptably insulated from the supply circuit before returning the repaired
instrument to the customer.
CHECKING METHOD
Measure the resistance value between the both poles of
attachment cup (power supply plug) and the exposed
parts (parts such as covers etc. where the customer can
easily touch) and check that the resistance value is
500k ohms or more.
SAFETY PRECAUTIONS
The following precautions should be observed when servicing.
Since many parts in the unit have special safety related characteristics, always use genuine HITACHI
replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers.
Critical parts are marked with a ! in the circuit diagram and printed wiring board.
Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to
ascertain that it is completely safe to operate without danger of electrical shock.
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