Safety Tests - NEC MultiSync LCD1550V Service Manual

3. Safety Tests

Perform the following inspection tests in accordance with the standards set forth in Common Electrical
Safety Inspection Standards for Information Processing Device & Office Equipment (DSQS-009-103).
Destination :
Applicable Regulations :
Classification :
Ratings :
3.1 Ground Continuity
( It is applied to the PSU built-in set. )
Perform the test at the points indicated below and make sure that the ground continuity values are within
the prescribed range. (This test is to be performed before the electric strength test.)
1) The Ground Line of inlet shall be satisfied indicated below.
a) The color of Ground Line is spiral of green and yellow.
b) The Ground Line is connected at specified point on the chassis base with specified screw.
2) Measurement Point- Between the ground terminal of power supply cord and the chassis Screw
The standard for a decision : Less than 0.1ohm. ( Input current 25A)
3.2 Electric Strength
( It is applied to the PSU built-in set. )
Perform the tests at the points indicated below and make sure that there is no dielectric breakdown or
flashing.
Measurement Points
Make measurements between the power supply terminals (other than the ground terminal) and each
of the following points : (See note below.)
Signal cable connector shell
Chassis base
Note : The two terminals other than the ground terminal (power supply cord) must be shorted out.
The standard for a decision :
World wide
UL1950, CSA C22.2 No 950 (C-UL), DHHS, TUV (EN60950), CE, PTB
Class I device (with safety ground), movable
AC 100-240V, 50/60Hz,
Unless otherwise specified, rating voltage is 240V.
Less than 10mA. ( Input voltage
5-7
1500V AC )