Cooper Bussmann 858 - Manual (Page 21)

DOCUMENT 1025
REV. H
Instruction Manual
AGS-LED
858 LED Series
Sizes 1, 2, 3, 4 and 5
12
Voltage is greater than 30-VDC, then you must wait until the Power Supply Output Voltage drops below
30-VDC before you proceed with the next step.
Open the Power Supply Box cover. Place current clamp around one of the wires connected to the switch
labeled with switch marker PWR. Connect the current clamp to the true RMS current meter. Measure the
input current. Current should measure between 2.7-ARMS and 6.7-ARMS depending on the CCR current
level or current step.
Upon completing the measurement of the input current, remove current clamp and close Power Supply
Box cover.
10.5 Checking Power Supply LED Cable
WARNING:
WARNING
Failure to turn off power to the sign and wait five minutes could result
in severe injury or death.
Turn off power to the sign. (WARNING: Wait five minutes after sign power is turned off to service
the sign. This will allow any residual high voltage stored in Power Supply PCB components to
bleed off. ) With your multimeter set to DC Volts, verify that the Power Supply Output Voltage is less
than 30-VDC at TP6 (Positive lead) and TP3 (Negative Lead) as indicated in Figure 21. If the Power
Supply Output Voltage is greater than 30-VDC, then you must wait until the Power Supply Output
Voltage drops below 30-VDC before you proceed with the next step.
Remove the sign top cover bolts and then lift the top cover from the sign. Remove the front face from the
sign. Check the Power Supply LED Cable for visible damage. Make sure the Power Supply LED cable
connector is properly seated in CN9 at the Power Supply Board (see Figure 18). Verify that the Power
Supply LED cable connector connects to the input connector of the first LED MODULE and is properly
seated in the input connector housing. The LED MODULE input connector and the output connector are
clearly marked with inward pointing and outward pointing black arrows, respectively, on the LED
MODULE PCB (see Figure 7).