Profotex-Speaker Active

Dead, when in turn on MCB PLN plummeted.
Measurement travo and input cable.
Travo was burnt,and occur short circuit.
Replace travo 3 amperes with 5 amperes.
Pairs of primary voltage at 240V then secondary voltage at 25V.
The goal is power is needed nothing less, travo lighter works.
Do not enter any the input signal.
Measuring currents using Ampere meter, currents should be close to 0 amperes.
when the magnitude of the current is close to 0 amperes, then it's ready to use.

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Kiseki CK-F18

Radio can only be turned on by using battery.
Travo was broken while travo spare parts on the market does not exist.
We use 24 volt travo booster antenna and turn it into 3 volts.
Way is:
Unloading travo booster and replace the secondary coil with a wire diameter of 0.3mm as much as 2 times 100 windings (3V-CT).

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Measurement Techniques Final Amplifier are often broken

I will discuss here is the OCL amplifier .
often in doing repairs, we are too hasty.
in replacing spare parts, we must be careful.
it will lead to cost over. because the spare parts that we replace the likelihood can be burn again.
preferably before we put the transistors final amplifier , we measure the working voltage.
we measured between the negative pole (-) with each end of B(basis) of the transistor amplifier should be half of the voltage positf (+) with a negative voltage (-) source.
if it deviates far, we measure the driver transistor.
there may be a leak.
measure with the multi at 10k ohm position.

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