Read Sharp LC-37GD1E (serv.man2) Service Manual online
PROTECTION AGAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by “
oughly familiar with all safety checks and the servicing guidelines which follow:
For continued protection, replacement parts must be
identical to those used in the original circuit.
The use of a substitute replacement parts which do not
have the same safety characteristics as the factory
recommended replacement parts shown in this service
manual, may create shock, fire or other hazards.
(Fire & Shock Hazard)
the following safety checks:
between the chassis and other metal parts in the
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
and connect the DC power cable into the receiver's
DC jack. (Do not use an isolation transformer for this
resistor paralleled by a 0.15µF capacitor in series with
all exposed metal cabinet parts and a known earth
connected to an earth ground.
higher, sensitivity or measure the AC voltage drop
across the resisor.
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All checks must be repeated with the AC cord plug
connection reversed. (If necessary, a nonpolarized
adaptor plug must be used only for the purpose of
completing these checks.)
Any reading of 0.75V rms (this corresponds to 0.5
milliamp. rms AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the monitor to the owner.
LCD SIDE : F2701,F2702(4A,250V)
LC-37GD1E : F7401, F7503(10A, 250V)
this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and
service manuals. The alphabetical character following LF shows the type of lead-free solder.
lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40ºC, we recommend
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldening
bit, contact our service station or service ranch in your area.
solder by 40°C, and as it has poor solder wettabillty, you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance
temperature of parts may be excoeded, remove the bit from the PWB as soon as you conurm the steady
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to tum on
and off the power of the bit as required.
if a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit
after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.