35
Trouble Shooting
8) NEVER force a terminal block into its location.
9) NEVER exchange or reposition terminal blocks on the circuit board.
10) In case of a major problem such as a burned or water-damaged circuit board, evaluate possible causes before
replacing it and turn the power back on.
11) Isolate the problem before changing the circuit board.
12) Return faulty circuit boards with the proper forms, concisely completed.
There may be several probable causes for a system malfunction. Listed on the next 3 pages are several probable caus-
es to aid in returning the system to operation as quickly as possible. The list is not all-inclusive and should only be used
as a guide.
PROBLEM
PROBABLE CAUSE SOLUTION
Unit will not
power up or
there is no
display
Inadequate supply
voltage. +9 to 28
VDC is required for
operation
1. With the key in the accessory position, check the battery voltage to the circuit
board. Use the negative terminal as DC ground. While the TCS 3000 will
power-up at +9VDC, it is recommended that the input be at least +12.6VDC.
2. Check the 7.5A, in-line fuse for continuity. It is located in the accessory power
line. Replace if necessary.
3. If the green light blinks fast it is doing what it is supposed to, but then it will go
to a slow blink. If you see red, then you do not have enough power on the
register. It must see a minimum of 9vdc.
4. If the red light comes on and the unit doesn’t power-up. Check the voltage if
the voltage is OK but the temperature is -20 this will indicate that the heater is
warming the display to prevent any damage to the VGA display and should
come-up shortly
Unit blow
7.5A Fuse
+12 VDC battery line
is shorted to ground
1. For safety reasons, remove the 7.5A, in-line fuse from the accessory power
cable.
2. Unscrew the 3 pin power connector. Inspect for stray wire strands and
visible shorts.
3. Inspect the full length of the power cable. Look for damaged insulation, which
may cause shorting between the cable and ground potential (e.g. truck frame
or chassis). If the power cable is damaged, it must be replaced.
4. Replace the 7.5A fuse and re-install the wires into the terminal connector.
5. If the 7.5A blows again, then replace the power cable.
6. If the 7.5A fuse blows after replacing the power cable, then replace the TCS
3000 terminal circuit board.
