Panasonic SU-373 - Page 2

Mi SAFETY PRECAUTION
mh wWhHND
prevent the customer from being exposed to a shock hazard.
e INSULATION RESISTANCE TEST
(This ‘safety precaution” is applied in U.S.A.)
. Before servicing, unplug the power cord to prevent an electric shock.
. When replacing parts, use only manufacturer’s 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
1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3MQ
and 5.2M2Q to all exposed parts.
all exposed parts. (Fig. B)
Note:
Antenna
terminal
Exposed 2 Exposed
metal Ch metal
part part |
Ohmmeter
(Fig. A)
Resistance = 3M2—5.2MQ
(Fig. A) Equipment without antenna terminals should read approximately infinity to
Some exposed parts may be isolated from the chassis by design. These will read infinity.
(Fig. B)
Resistance = Approx oo
4. |f the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be
repaired and rechecked before It is returned to the customer.
Mi
PROTECTION
CIRCUITRY
The protection circuitry may have operated if either of the
following conditions is noticed:
@ No sound is neard when the power is turned on.
@ Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage
if, for example, the positive and negative speaker connection
wires are ‘‘shorted’’, or if speaker systems with an impedance
less than the indicated rated impedance of this unit are used.
Mi BEFORE REPAIR
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct It.
3. Turn on the power once again after one minute.
Note
When the protection circuitry functions, the unit will not
operate unless the power is first turned off and then on
again.
Disconnect AC power, Discharge both Power Supply Capacitors C703 and C704 through a 102, 5W resistor to ground.
DO
NOT
SHORT-CIRCUIT
DIRECTLY
(witha
screwdriver
blade,
for
instance),
as
this
may
distroy
solid
state
devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at 120V, 60Hz in NO SIGNAL mode should be 250 ~ 500mA.
e Accessories
@AC power supplycord ............ 1 e Flat cable for remote-control
(SJA172—1) operation .... 1
(SWKUV96KM)
eBatteries.......... 2
(UM—3NEP)
@ Remote-control