NEC DPro2070SB, Service Manual

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2.5 Inspections (In normal mode)
2.5.1 Electrical performance
Inspect the electrical performance after confirming that the contrast is set to MAX and the
bright is set to center (by pressing (-) (+) buttons simultaneously).
After inspection, carry out FACTORY PRESET operation.
2.5.1.1 Withstand voltage
There must be no abnormality when 1500VAC is applied for two seconds between both ends of
the AC input terminal and chassis, and between the DG coil terminal and chassis.
The cut-off current should be 20mA.
2.5.1.2 Grounding conductivity check
Check that the resistance value is 100ohms or less when 25A is passed between the AC input
terminal grounding GND and chassis GND.
2.5.1.3 Degaussing coil operation
Confirm that when OSM DEGAUSS is executed, the picture vibrates and then stops.
2.5.1.4 IPM OFF MODE function operation (Set the AC power input to 230V)
Use the full white pattern without R, G, B signals.
Select IPM OFF MODE from OSM, and set to 1:ENABLE.
(1) IPM OFF MODE ENABLE
(a) Confirm that when R, G, B, H/V SYNC signals are removed, the system waits for
approx. five seconds, displays IPM OFF MODE for approx. three seconds, and then the
picture dark ens.
Also confirm that Power Indicator changes to orange and the power consumption is
as follows.
(b) Confirm that when R, G, B, H/V SYNC signals are input again, the high voltage is
rcovered, and the picture appears in approx. five seconds.
Adjustment item
Inspections
Adjustment mode/set
Normal mode
Imput signal/pattern
Status
indicator
Confirmation timing
Timing No. 12 (106.25kHz / 85Hz, 1600x1200)
Power consumption 3W or less