Philips TFT LCD Colour Monitor, Руководство по обслуживанию

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27 190B4 LCD
Safety Test Requirements
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
：
Condition Hi-Pot Test for
products
where the
mains input
range is Full
range (or
220VAC)
Hi-Pot test
for products
where the
mains input
is 110VAC
(USA type) Ground
Continuity test
requirement
Test voltage 2820VDC
(2000VAC) 1700VDC
(1200VAC)
Test time
(min.) 3 seconds 1 second
Trip current
(Tester) Set at 100uA
for Max.
limitation; set
at 0.1uA for
Min. limitation 5mA
Ramp time Set at 2
seconds
Test current:
25A, AC
Test time:
3 seconds(min.)
Resistance
required:
≦
0.09+R ohm,
R is the
resistance of
the mains cord.
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
v 5%.
2.3.4 The grounding blade or pin of mains plug must be
conducted with accessible metal parts.
3. Equipments and Connection
3.1 Equipments
For
example
：
- ChenHwa 9032 PROGRAMMABLE AUTO SAFETY
TESTER
- ChenHwa 510B Digital Grounding Continuity tester
- Chen Hwa 901 (AC Hi-pot test), 902 (AC, DC Hi-pot test)
Withstanding tester
3.2 Connection
* Turn on the power switch of monitor before Hi-pot and
Ground Continuity testing.
4. Recording
Hi-pot and Ground Continuity testing records have to be kept
for a period of 10 years.
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