Warning – Cooper Bussmann 858 User Manual
Page 23
DOCUMENT 1025
REV.
H
Instruction Manual
AGS-LED
858 LED Series
Sizes 1, 2, 3, 4 and 5
14
Turn off power to the sign by turning off the corresponding Constant Current Regulator (CCR) power.
(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 22. 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 black return cable connector from the last LED MODULE output cable connector (see
Figures 7-11 & 20). Replace the output cable connector in the first LED MODULE with the black return
cable connector. Turn on main power. If the first LED MODULE momentarily lights and then turns off,
then the first LED MODULE and the Power Supply LED cable and Power Supply board are operating
normally.
Turn off main power to the sign. Wait five minutes for the power supply voltages to dissipate. Verify that
the output voltage is less than 30-VDC with a multimeter as described in the opening paragraph of this
section. Replace the black return cable connector with the first LED MODULE output cable connector.
If the sign does not light at all, then replace the LED MODULE #1 and/or the cable connecting from the
output of the Power Supply to the input of LED MODULE #1(see Section 10.10). Then repeat the test
described above in this section.
10.8
Checking the Second LED MODULE
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 by turning off the corresponding Constant Current Regulator (CCR) power.
(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 22. 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 black return cable connector from the last LED MODULE output cable connector. Replace
the output cable connector in the second LED MODULE with the black return cable connector. Turn on
main power to the sign. If both LED MODULES momentarily light and then turn off or stays lit, then the