Panasonic sc tm 22 service manual

Page 2

1 Safety Precaution

(This Safety Precaution is applied only in U.S.A.)

Before servicing, unplug the power cord to prevent an electric
shock.

When replacing parts, use only manufacturers recommended
components for safety.

Check the condition of the power cord. Replace if wear or
damage is evident.

After servicing, be sure to restore the lead dress, insulation
barriers, insulation papers, shields, etc.

Before returning the serviced equipment to the customer, be
sure to make the following insulation resistance test to
prevent the customer from being exposed to a shock
hazard.

1.1 Insulation Resistance Test

Unplug the power cord and short the two prongs of the plug
with ajumper wire.

Turn on the power switch.

Measure the resistance value with ohmmeter between the jumper
AC plug and each exposed metal cabinet part, such as
screwheads, antenna, control shafts, handle brackets, etc.Measure
the resistance value with ohmmeter between the jumper AC
plugand each exposed metal cabinet part, such as screwheads,
antenna, control shafts, handle brackets, etc.

Equipment with antenna terminals should read between 2.7M and
3.9M to all exposed parts". (Ligi)

Equipment without antenna terminals should read approximately
infinity to all exposed parts. (Ligg )

*Note : Some exposed parts may be isolated from the chassisby
design. These will read infinity.

If the measurement is outside the specified limits, there is a
possibility of a shock hazard. The equipment should be
repaired and re-checked before it is returned to the
customer.

Fig.1

Antenna
terminal \

Exposed /
metal part
Ohmmeter
Resistance : 2.7MQ - 3.9M Q
Fig.2
,0
Exposed /
metal part

Ohmmeter
Resistance = Approx 00