Daktronics AB-1600-1.5,2.5 - Manual (Page 54)

Maintenance & Troubleshooting 4-10
< F5 >.
7. Check your display and record the location of any bad lamps on the test form.
Note: A test pattern can also run from the data distributor. Refer to the data distributor manual for
instructions on starting these test patterns.
The Pixel Locator Method: The pixel locator method checks for bad lamps without leaving the
controller. To run the Pixel Locator:
1. From the Venus 7000 Shell, open the Monitor program.
2. Open the Diagnostics program.
3. In the Diagnostic text box, select Pixel Locator.
4. Select the driver size of your display, (8 by 16).
5. Click on Start. This will light the entire top row and the entire left column of lamps. You’ll be
able to see if any of the lamps in the top row are bad.
a) If you spot a bad lamp, arrow to the right until the lighted column is on the bad lamp, i.e.,
the intersection of the lighted row and the lighted column is on the bad lamp.
b) To record the location of the bad lamp, press the Stuck Off button. If you have a lamp
that is stuck on, follow the same procedure but press the Stuck-On button instead of the
Stuck Off button.
6. Arrow down one row at a time to check each row for bad lamps, recording each bad lamp in
the same way.
7. After marking the location of all the bad lamps, turn the display power off at the main power
disconnect.
Note: For more information about lamp testing and replacement, refer to the Venus 7000
controller manual or contact the Daktronics Animation Department.
Optional Lampbank Driver Test Table
The purpose of the test table is to check the lampbank input and output and to determine if all
lamps are working within that lampbank. Use the following steps as a guide when using the test
table. Refer to Drawing A-96449 for the location of jacks.
1. Remove the lampbank from the lens/reflector assembly or from the display.
2. Plug the test table into a standard 230-volt outlet. A standard IEC outlet is on the test table.
Make sure the power switch is OFF.
3. Place the 4-pin jumper plug into J42 for the 2-
1
/
2
O, 1
/
4
O lampbank.
CAUTION: Never insert jumpers into both J42 and J43 at the same time.
4. Attach power cable from J45 to the power plug of the lampbank.
5. Attach signal cables to the lampbank. The cable from J34 attaches to the input jack of the
lampbank and the cable from J38 attaches to the output jack of the lampbank. For lampbanks
with piggyback boards, connect the signal wire from the test fixture directly to the lampbank
input.
6. Turn power switch ON and mark all bad lamps with a piece of masking tape.
Note: Do not remove or replace lamps with the power ON as this may damage the
lampbank.