SECTION 5
COMMISSIONING FAULT FINDING
WARNING! FAULT FINDING SHOULD BE UNDERTAKEN
ONLY BY SUITABLY TRAINED PERSONNEL.
Basic Hardware
A) The display is blank or frozen, the leds are unlit and the neon does not fire:-
1. Ensure that power is being supplied to the board, and that it is correctly wired.
Refer to figure 3, on Page 3.
2. Check fuses F3 (ac) and F4 (dc)
3. Check that the supply voltage is within specified levels (See Section 1 Page 3).
A large voltage drop can cause the unit to lock and show last distance or level
reading.
B) The fuse blows continuously:-
1. Power down and fit a new fuse – refer to Page 3
Remove all connection blocks except AC power TB6 or DC power TB1.
If fuse does not blow on power up insert each terminal block until fault
reappears.
Check wiring of this terminal block.
2. Check that the power supply is within specified limits -refer to Page 3.
3. Check the enclosure for metal debris which may be under the lower PCB.
C) The system powers up, but displays garbage:-
1. Power down then check that an EPROM is fitted at U2 and that it is firmly in
place.
D) The display is blank:-
1. Power down then check that a jumper link is fitted on 3 pin link LK1 at the
side of the display on the top PCB going between the centre pin and pin W.
E) The display appears faded or too dark:-
1. Adjust contrast pot P1.
Ref: MINIFLEX LR MANUAL Rev. 0 43
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