Panasonic Lumix DMC-LZ30P, Service Manual

3

1 Safety Precautions

1.1.

General Guidelines

1.

IMPORTANT SAFETY NOTICE

There are special components used in this equipment 
which are important for safety. These parts are marked by         

 in the Schematic Diagrams, Circuit Board Layout, 

Exploded Views and Replacement Parts List. It is 
essential that these critical parts should be replaced with 
manufacturer’s specified parts to prevent X-RADIATION, 
shock, fire, or other hazards. Do not modify the original 
design without permission of manufacturer.

2. An Isolation Transformer should always be used during 

the servicing of AC Adaptor whose chassis is not isolated 
from the AC power line. Use a transformer of adequate 
power rating as this protects the technician from 
accidents resulting in personal injury from electrical 
shocks. It will also protect AC Adaptor from being 
damaged by accidental shorting that may occur during 
servicing.

3. When servicing, observe the original lead dress. If a short 

circuit is found, replace all parts which have been 
overheated or damaged by the short circuit.

4. After servicing, see to it that all the protective devices 

such as insulation barriers, insulation papers shields are 
properly installed.

5. After servicing, make the following leakage current 

checks to prevent the customer from being exposed to 
shock hazards.

1.2.

Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the 

two prongs on the plug.

2. Measure the resistance value, with an ohmmeter, 

between the jumpered AC plug and each exposed 
metallic cabinet part on the equipment such as 
screwheads, connectors, control shafts, etc. When the 
exposed metallic part has a return path to the chassis, the 
reading should be between 1 M

Ω

 and 5.2 M

Ω

. When the 

exposed metal does not have a return path to the chassis, 
the reading must be infinity.

1.3.

Leakage Current Hot Check 
(See Figure 1.)

1. Plug the AC cord directly into the AC outlet. Do not use 

an isolation transformer for this check.

2. Connect a 1.5 k

Ω

, 10 W resistor, in parallel with a 0.15 

µ

F 

capacitor, between each exposed metallic part on the set 
and a good earth ground, as shown in Figure 1.

3. Use an AC voltmeter, with 1 k

Ω

/V or more sensitivity, to 

measure the potential across the resistor.

4. Check each exposed metallic part, and measure the 

voltage at each point.

5. Reverse the AC plug in the AC outlet and repeat each of 

the above measurements.

6. The potential at any point should not exceed 0.75 V RMS. 

A leakage current tester (Simpson Model 229 or 
equivalent) may be used to make the hot checks, leakage 
current must not exceed 1/2 mA. In case a measurement 
is outside of the limits specified, there is a possibility of a 
shock hazard, and the equipment should be repaired and 
rechecked before it is returned to the customer.

Figure. 1