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Amended: Jan 2014
Getting Started & Fault Diagnosis
Powering the panel.
When the panel is powered up it will go through a boot up sequence and will test all the display LEDs.
The touch screen should be illuminated and show the normal front screen. If that does not happen
this section details common problems and methods of fixing the problem.
Panel takes a long time to start the boot up sequence after a
watchdog reset (or power up).
On 4 loop panels (with 2 loop driver cards) there may sometimes be a long delay in watchdog. The
following steps will speed up a reset.
Place a jumper link on a loop driver (2 pins near crystal).
The panel will reset and the relay click will be heard 4-6 seconds later.
Remove the jumper link from the loop driver card.
IMPORTANT the jumper link must not be left on a panel once it is booted up.
Power LED not illuminated
If this happens, the display PCB is not getting power. The following steps should help identify where
the fault is.
Always power down the panel before disconnecting and connecting any PCB wires or cables.
Refer to DF6000 Motherboard drawing
First confirm the PSU PCB is working correctly. Disconnect the red multiway connector from the PSU
and mother board, check it
’s continuity.
Check the voltage on the battery connectors, this should be around 26V. If this is lower check the
battery fuse
– replace as necessary. If the fuse is OK, then the PSU PCB needs replacing.
Power up the PSU and carefully check the +26V and +26Vraw connectors are at around 26V, if they
are power down the PSU and reconnect the PSU to the motherboard by the red connector.
Next confirm the motherboard is working. Disconnect the ribbon cable, loops etc. only leave the
connection to the PSU. Find the test points on the Loop motherboard PCB check +26V, +26Vraw and
also Vcc (should be 5V). If any are low check the PCB for any contamination shorting on the board. If
this doesn't clear the problem replace the motherboard.
Next connect the display ribbon cable only. Check the Vcc on the motherboard and the display board.
If it is 5V on the motherboard only replace the ribbon cable. If both are low check the display for
shorts.
Replace the micro board and display board separately to locate which is faulty.
Power LED on but touch screen is not illuminated
Connect a PC using panel comm. When the panel is reset debug code should be shown on panel
comm, if it is the following should fix the problem.
Ensure the connector on the inverter is securely in position.
Ensure the micro board is securely connected to the display board.
There are two 5V regulators on the motherboard, check both Vcc and 5V backlight are at 5V, if not
replace the motherboard, if they are replace the display board.
If the panel does not respond on panel comm, ensure the micro board is connected to the display
PCB securely. Otherwise replace the micro and display PCBs.
