Controller address & test mode, Light detector, Controller address & test mode -3 – Daktronics AF-3020-7.6-R,A User Manual

Page 25: Light detector -3

Figure 15: Location of DIP
Switches

Control er Address & Test Mode

Before a display can be run in a sign network, it must have an
address. The display address can be set using “DIP” switches
located on a PC board known as the MDC. The MDC is the
circuit card mounted in the lower right corner of the controller
board.

Locate the DIP switches on the MDC. They should be on the
bottom end of the card. Refer to Figure 15 for a picture of the
DIP switches.

When replacing a controller board, be sure to set the DIP
switches to the same address configuration as the defective
controller. The DIP switches follow standard binary code.

Note: A test mode can be activated by setting the DIP switches
to address 0 (flip all the switches toward the numbers on the
circuit board). The display’s power must be disconnected, and
then reconnected to run the test mode.

Switch

Address

Off Off Off Off Off Off Off On 1
Off Off Off Off Off Off On Off 2
Off Off Off Off Off Off On On 3
Off Off Off Off Off On Off Off 4
Off Off Off Off Off On Off On 5
Off Off Off Off Off On On Off 6
Off Off Off Off Off On On On 7
Off Off Off Off On Off Off Off 8
Off Off Off Off On Off Off On 9
Off Off Off Off On Off On Off 10

… … … … … … … …

Off On On On On On On On 127

4.5 Light

Detector

Reference Drawing:

Assembly, Photo Cell Bracket ............................................................. Drawing A-169332

The light detector assembly is mounted inside the bottom left of the cabinet. The entire assembly fits
over two stud-welded screws. If the light detector should fail, only the circuit board (Daktronics part
no. 0P-1151-0002) needs to be replaced. To replace a failed light detector, refer to the following
steps:

1. Remove the #8-32 nuts (HC-1354) behind the circuit board plate (øM-165978) and then remove

the plate and circuit board from the assembly.

2. Remove the #4-40 nuts (HC-1352) securing the circuit board to the plate.
3. Disconnect the electrical connections to the light detector.
4. Contact Daktronics for a replacement part (refer to Section 4.11).

Maintenance & Troubleshooting

4-3