Akai CT-S21MTD-E3 Service Manual download pdf (Page 3)

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PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this TV

receiver have special safety-related characteristics.

These characteristics are offer passed unnoticed by

visual spection and the protection afforded by them

cannot necessarily be obtained by using replacement

components rates for a higher voltage, wattage, etc.

The replacement parts which have these special

safety characteristics are identified by marks on

the schematic diagram and on 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, X-RAY RADIATION or

other hazards.

Good earth ground

such as the water

pipe, conductor,

etc.

Place this probe

on eac h e x-

posed metallic

part

AC VOLTMETER

AC Leakage Current Check

4. Completely discharge the high potential voltage of the

picture tube before handling. The picture tube is a

vacuum and if broken, the glass will explode.

5. When replacing a MAIN PCB in the cabinet, always

be certain that all protective are installed properly

such as control knobs, adjustment covers or shields,

barriers, isolation resistor networks etc.

6. When servicing is required, observe the original lead

dressing. Extra precaution should be given to assure

correct lead dressing in the high voltage area.

7. Keep wires away from high voltage or high tempera

ture components.

8. Before returning the set to the customer, always

perform an AC leakage current check on the exposed

metallic parts of the cabinet, such as antennas,

terminals, screwheads, metal overlay, control shafts,

etc., to be sure the set is safe to operate without

danger of electrical shock. Plug the AC line cord

directly to the AC outlet (do not use a line isolation

transformer during this check). Use an AC voltmeter

having 5K ohms volt sensitivity or more in the

following manner.

Connect a 1.5K ohm 10 watt resistor paralleled by a

0.15µF AC type capacitor, between a good earth

ground (water pipe, conductor etc.,) and the exposed

metallic parts, one at a time.

Measure the AC voltage across the combination of

the 1.5K ohm resistor and 0.15 uF capacitor. Reverse

the AC plug at the AC outlet and repeat the AC

voltage measurements for each exposed metallic

part.

The measured voltage must not exceed 0.3V RMS.

This corresponds to 0.5mA AC. Any value exceeding

this limit constitutes a potential shock hazard and

must be corrected immediately.

The resistance measurement should be done

between accessible exposed metal parts and power

cord plug prongs with the power switch "ON". The

resistance should be more than 6M ohms.

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Akai CT-S21MTD-E3 Service Manual Page 3

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