Hitachi AX-F300 Service Manual page 2

AX-F300

Check that exposed parts are acceptably insulated from

the supply circuit before returning the repaired instrument

to the customer.

• • • • • Checking method

Checking method

Measure the resistance value between the both poles of

attachment cup (Power supply plug) and the exposed

parts (Parts such as Knob, Cover, etc. where the cus-

tomer is easy to touch.) and check that the resistance

value is 500 kohms or more.

SAFETY PRECAUTIONS

The following precautions should be observed when servicing.

1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachi's replacement

parts. Especially critical parts in the power circuit block should not be replaced with other makers. Critical parts

are marked with

2. 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.

in the circuit diagram and printed wiring board.

Insulation tester (DC 500V)

– 2 –

INSTRUMENT

(Exposed part)

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