LK404-25-E Matrix Orbital, LK404-25-E Datasheet - Page 15

• Manufacturer Part Number: LK404-25-E
• Description: LCD Character Display Modules 40x4 Grn/Yel Ext Temp
• Manufacturer: Matrix Orbital

Specifications of LK404-25-E

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3 Troubleshooting
3.1 The display does not turn on when power is applied.
3.2 The display module is not communicating.
Matrix Orbital
• First, you will want to make sure that you are using the correct power connector. Standard floppy
• The next step is to check the power cable which you are using for continuity. If you don’t have an
• The last step will be to check the Power / Data Connector on the LK404-25. If the Power / Data
• First, check the communication cable for continuity. If you don’t have an ohm meter, try using a
• Second, please ensure that the display module is set to communicate on the protocol that you are
drive power cables from your PC power supply may fit on the Power/Data Connector however they do
not have the correct pin out as can be seen in figure 8 on page 4. Matrix Orbital supplies power cable
adapters for connecting to a PC, which can be found in the Accessories Section on page 1.
ohm meter, try using a different power cable, if this does not help try using a different power supply.
Connector has become loose, or you are unable to resolve the issue, please contact Matrix Orbital,
see 14.6 on page 53 for contact information.
different communication cable. If you are using a PC try using a different Com Port.
using, by checking the Protocol Select Jumpers. To change the protocol used by the display module
see Section 2.3 on page 8.
NOTE The Ground / +5V pin is toggled by the jumper to the right of the keypad connec-
tor. Jump 1 & 2 for +5V or 2 & 3 for GND.
Figure 18: Keypad Interface Connector
LK404-25
11