Safety Test Requirements - Philips 150P4CG Service Manual

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All units that are returned for service or repair must pass the
original manufactures safety tests. Safety testing requires both
Hipot and Ground Continuity testing.
HI-POT TEST INSTRUCTION
1. Application requirements
1.1 All mains operated products must pass the Hi-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 HiPot and Ground Continuity tested as
follows:
Condition HiPot Test for HiPot Test for
products where products where
the mains input the mains input is
range is Full 110V AC(USA
range(or 220V type)
AC)
Test 2820VDC 1700VDC
voltage (2000VAC) (1200VAC)
Test time 3 seconds 1 second
(min.)
Trip set at 100 uA 5 mA
current for Max.
(Tester) limitation; set
at 0.1 uA for
Min. limitation
Ramp set at 2
time 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%.
2.2.4 The grounding blade or pin of mains plug must be
conducted with accessible metal parts.
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Safety Test Requirements

Ground Continuity
Test requirement
Test current:
25A,AC
Test time:
3 seconds(min.)
Resistance
required:
<=0.09+R ohm,
R is the
resistance of
the mains cord.
3. Equipments and Connection
3.1. Equipments
For example :
- ChenHwa 9032 PROGRAMMABLE AUTO SAFETY
TESTER
- ChenHwa 510B Digital Grounding Continuity Tester
- ChenHwa 901 (AC Hi-pot test), 902 (AC, DC Hi-pot test)
Withstanding Tester
3.2. Connection
* Turn on the power switch of monitor before Hipot and
Ground Continuity testing.
Clip
Clip
(ChenHwa 9032 tester)
Connect the "video cable"
or "grounding screw"
to the CLIP on your tester.
Connect the power cord
to the monitor.
4. Recording
Hipot and Ground Continuity testing records have to be kept for
a period of 10 years.
21
150P4 LCD
Go to cover page
Video cable
Grounding screw
Power outlet
(Rear view of monitor)