Daewoo DTQ-20D4SSFM, DTQ-14D4SSFM service manual Safety Checks

PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS

CAUTION : Do not attempt to modify this product in any way. Unau- thorized modifications will not only void the warranty, but may lead to your being liable for any resulting property damage or user injury.

Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guide- lines. To do otherwise, increases the risk of potential hazards and injury to the user.

SAFETY CHECKS

After the original service problem has been corrected, a check should be made of the following:

SUBJECT : FIRE & SHOCK HAZARD

1.Be sure that all components are positioned in such a way as to avoid possibility of adjacent component shorts. This is especially important on those chassis which are transported to and from the repair shop.

2.Never release a repair unless all protective devices such as insula- tors, barriers, covers, shields, strain reliefs, and other hardware have been reinstalled per original design.

3.Soldering must be inspected to discover possible cold solder joints, frayed leads, damaged insulation (including A.C. cord), solder splashes or sharp solder points. Be certain to remove all loose for- eign particals.

4.Check for physical evidence of damage or deterioration to parts and components, and replace if necessary follow original layout, lead length and dress.

5.No leads or components should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal sur- faces must be avoided.

6.All critical components such as fuses, flameproof resistors, capaci- tors, etc. must be replaced with exact factory types. Do not use replacement components other than those specified or make unrecommended circuit modifications.

7.After re-assembly of the set always perform an A.C. leakage test on all exposed metallic parts of the cabinet, (the channel selector knob, antenna terminals, handle and screws) to be sure the set is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this test. Use an A.C. voltmeter, having 5000 ohms per volt or more sensitivity, in the following manner : connect a 1500 ohm 10 watt resistor, paralleled by a 15 mfd. 150V A.C. type capacitor between a known good earth ground (9water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the A.C. voltage across the combination of 1500 ohm resistor and 0.15 MFD capacitor. Reverse the A.C. plug and repeat A.C. voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts R.M.S. This corresponds to 0.5 milliamp A.C. Any value exceeding this limit constitutes a potential shock hazard and must be corrected imme- diately.

A.C. VOLTMETER

Good earth ground,	0.15 uF
such as the water
	1500 OHM	Place this probe
pipe, conduit, etc.
		on each exposed
	10WATT
		metal part.

GRAPHIC SYMBOLS :

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the service personnel to the presence of uninsu- lated “dangerous voltage”that may be of suffi- cienty magnitude to constitute a risk of electric shock.

The exclamation point within an equilateral tri- angle is intended to alert the service personnel to the presence of important safety information in service literature.

Fuse symbol is printed on pcb adjacent to the fuse, with “RISK OF FIRE REPLACE FUSE AS MARKED”. The symbol is explained in the ser- vice manual with the following wording or equiv- alent.

“CAUTION : FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH SAME TYPE (4A, 125V)” and

“ATTENTION: AFIN D’ASSU UNE PROTECTION PERMANENTE CONTRE LES RISQUES D’INCENDIE, REMPLACER UNIQUE- MENT PAR UN FUSIBLE DE MEME TYPE ET DE ”4A, 125V”.

SUBJECT : X-RADIATION

1.Be sure procedures and instructions to all service personnel cover the subject of X-rays in current T.V. receivers is the picture tube. However, this tube does not emit X-rays when the high voltage is at the factory specified level. The proper value is given in the appli- cable schematic. Operation at higher voltages may cause a failure of the picture tube or high voltage supply and, under certain cir- cumstances, may produce radiation in excess of desirable levels.

2.Only factory specified C.R.T. anode connectors must be used. Degaussing shields also serve as X-ray shield in color sets. Always re-install them.

3.It is essential that the serviceman has available an accurate and reliable high voltage meter. The calibration of the meter should be checked perio - dically against a reference standard. Such as the one available at your distributor.

4.When the high voltage circuitry is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be run up and down while monitor- ing the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating cor- rectly. We suggest that you and your service organization review test procedures so that voltage regulation is always checked as a standard servicing procedure. And that the high voltage reading be recorded on each customer’s invoice.

5.When troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, avoid being unnecessarily close to the picture tub eand the high voltage compartment.

Do not operate the chassis longer than is necessary to locate the cause of excessive voltage.

6.Refer to HV, B+and Shutdown adjustment procedures described in the appropriate schematic and diagrams(where used).

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