Safety Test Requirements - Philips TFT LCD Colour Monitor Service Manual

19” tft lcd colour monitor

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190B4 LCD

All units that are returned for service or repair must pass the

original manufactures safety tests. Safety testing requires both

Hi-pot and Ground Continuity testing.

HI-POT TEST INSTRUCTION

1. Application requirements

1.1 All mains operated products must pass the H-Pot test as

described in this instruction.

1.2 This test must be performed again after the covers have

been refitted following the repair, inspection or modification

of the product.

2. Test method

2.1 Connecting conditions

2.1.1 The test specified must be applied between the

parallel-blade plug of the mainscord and all accessible

metal parts of the product.

2.1.2 Before carrying out the test, reliable conductive

connections must be ensured and thereafter be

maintained throughout the test period.

2.1.3 The mains switch(es) must be in the "ON" position.

2.2 Test Requirements

All products should be Hi-Pot and Ground Continuity tested as

follows¡ G

Condition

Hi-Pot Test for

products

where the

mains input

range is Full

range (or

220VAC)

Test voltage

2820VDC

(2000VAC)

Test time

3 seconds

(min.)

Trip current

Set at 100uA

(Tester)

for Max.

limitation; set

at 0.1uA for

Min. limitation

Ramp time

Set at 2

seconds

2.2.1 The test with AC voltage is only for production purpose,

Service center shall use DC voltage.

2.2.2 The minimum test duration for Quality Control Inspector

must be 1 minute. No breakdown during the test.

2.2.3 The test voltage must be maintained within the specified

voltage + 5%.

2.3.4 The grounding blade or pin of mains plug must be

conducted with accessible metal parts.