Rolsen RL-26X20 SERVICE
1. Precautions
Prior to shipment from the factory, the products are strictly inspected to conform with the recognized product safety
and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it
is equally important to implement the following precautions when a set is being serviced.
SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone unfamiliar with the necessary precautions on this TV.
The following are the necessary precautions to be observed before servicing this chassis.
1. An isolation Transformer should be connected in the power line between the TV and the AC line before any
service is performed on the TV.
2. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in
place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network
etc.
3. Before returning the set to the customer, always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as terminals, screwheads, metal overlays, control shafts etc. to be sure
the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a AC outlet
(do not use a line isolation transformer during this check). Use an AC voltmeter having 5000
more sensitivity in the following manner: Connect a 1500
10W resistor, paralleled by a 0.15 F, AC type capacitor,
u
AC VOLTMETER
between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the combination of 1500
0.15 F
resistor and 0.15
AC outlet and repeat
the
u
F capacitor. Reverse the AC plug at
AC voltage measurements for
each exposed metallic part. Voltage measured must not
exceed 5.25V(rms). This corresponds to 3.5 mA(AC). Any
value exceeding this limit constitutes a potential shock
Good earth ground
such as a water
pipe, conduit, etc.
u
1500
10W
hazard and must be corrected immediately.
per volt or
Place this probe on
each exposed
metallic part.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts
which have these special safety characteristics are identified in this manual and its supplements; electrical
components having such features are identified by the international hazard symbols on the schematic diagram
and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts which do not have the same safety characteristics as specified in the parts list may create
shock, fire or other hazards.
DANGER
The components such as the power supply and FL inverter carry high voltages. When you partially disassemble the computer and turn on the components, use extreme care not to touch the connectors and components to avoid the risk of electrical shock. Do not disassemble individual components during first-level maintenance.
1-1
SAFETY NOTICE
Handling the LCD Module
Safety Precaution
In case the screen is damaged and the internal liquid
leaks, do not suck or drink the internal fluid. Nor do you
touch it either, otherwise you might be poisoned or get a
rash with your skin. If the internal fluid enters your
mouth, rinse with water. If it adheres to your skin or
clothes, wipe it away with alcohol and then wash with
water. If it enters your eyes, wash with running water
immediately.
Precautions for handling the LCD module
The LCD module can be easily damaged during assembly
or disassembly. Observe the following precautions when
handling the LCD module:
1. When installing the LCD module in the LCD cover, be
sure to seat it so that it is properly aligned and
maximum visibility of the display is maintained.
3. If the panel’s surface gets dirty, wipe it with cotton or
a soft cloth. If it is still dirty
surface to create a light condensate and wipe it again.
If the surface is very dirty, we recommend a CRT
cleaning agent. Apply the agent to a cloth and then
wipe the panel’ s surface. Do not apply cleanser
directly to the panel. Also, never scratch the surface.
4. If water or other liquid is left on the panel’ s surface for
a long period, it can change the screen’ s tint or stain it.
Be sure to quickly wipe off any liquid.
, try breathing on the
2. Be careful to align the four holes at the right side and
left side of the LCD module with the corresponding
holes in the LCD cover before securing the module
with four screws. Do not force the module into place,
because stress can affect its performance. Also, the
panel’s polarized surface is easily scarred, so be
careful when handling it.
1-2
5. Glass is used in the panel, so be careful not to drop it
or let it strike a hard object, which could cause
breakage or cracks.
Loading...