Emerson 2468CD, 2468CB manual 4-15, Flickering Display

Hydrastep 2468CB & 2468CD Manual Remote Display Options 24683B, C & D

Indication	Fault	Analysis and Corrective Action
Flickering Display	Corruption of signal	Most probably caused by bad shielding (screening) of the remote
	data	display cabling or by bad shield connections to ground.
		Check shielding and shield connections. Ensure that only one
		end of the cable shield is connected to ground.
		If several remote displays are ‘daisy chained’ together then a
		termination resistor may be required on the end display. (See
		Section 4.4.3 in this chapter.)
Chequered	Wrong setting of	Refer to Section 2.3 in Chapter 2 and ensure that the switch is set
pattern on red	‘Number of	correctly. If the display still shows a chequered pattern then a
and green LED	Electrodes’ switch	circuit fault exists on the 2468 display board. Remove this board
display	on 2468 display	and fit a serviceable replacement.
	board.
On/off pattern on	Wrong setting of	As above.
red and green	‘Number of
LEDs.	Electrodes’ switch	If a fault is not found, check the link setting on the 24683BB and
	on 2468 display	reset the links if necessary.
	board, or wrong
	setting of links LK1,
	LK2, LK3 and LK4
	on the 24683BB
	decoding pcb.
Indication not		As above.
displayed for	As above.
lower electrodes.
Each electrode
represented by
only one LED	As above.	As above.
when 16 or less
electrodes are
used.
LEDs display an
irregular	As above.	As above.
red/green
pattern.

Table 4.1 (cont.) - Fault Analysis and Correction Chart

24685034 4-15