akira 14KLS4/CE, Service Manual

Page: 6 / 33

- 6 -
Model No.: 14KLS4CE
Version: 1.0
To determine the presence of high voltage, use accurate high impedance HV meter connected between
the second anode lead and the CRT dag grounding device. When servicing the High Voltage System
remove static charges from it by connecting a 10K Ohm resistor in series with an insulated wire (such
as test probe) between the picture tube dag and 2nd anode lead (Have AC line cord disconnected from
AC supply).
The picture tube used in this receiver employ integral implosion protection. Replace with a tube of the
same type number for continued safety. Do not lift picture tube by the neck. Handle the picture tube
only when wearing shatterproof goggles and after discharging the high voltage completely. Keep
others without shatter proof goggles away.
Before returning the receiver to the user, perform the following safety checks:
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the receiver.
2. Replace all protective devices such as non-metallic control knobs, insulating fish papers,
cabinet backs, adjustment and compartment covers of shields, isolation resistor-capacitor
networks, mechanical insulators etc.
3. To be sure that not shock hazard exists, a check for the presence of leakage current
should be made at each exposed metal part having a return path to the chassis (antenna,
cabinet metal, screw heads knobs and/or shafts, escutcheon, etc.) in the following
manner.
Plug the AC line cord directly into a 110V/220V/240V, AC receptacle. (Do not use an Isolation
Transformer during these checks.) All checks must be repeated with the AC line cord plug connection
reversed. (If necessary, a non polarized adapter plug must be used only for the purpose of completing
these checks.)
If available, measure current using an accurate leakage current tester. Any reading of 0.35mA or more
is excessive and indicates a potential shock hazard, which must be corrected before returning the
receiver to the owner.
If a reliable leakage current tester is not available, this alternate method of measurement should be
used. Using two clips leads, connect a 1500 Ohm, 10 Watt resistor paralleled by a 0.15MF capacitor
in series with a known earth ground, such as a water pipe or conduit and the metal part to be checked.
Use a VTVM or VOM with 1000 Ohms per Volt, or higher, sensitivity to measure this AC voltage
drop across the resistor. Any reading of 0.35 Volt RMS of more is excessive and indicates potential
shock hazard, which must be corrected before returning the receiver to the owner.