Advantech Fault Finding INTRAC-305, Fault Symptoms, Intrac doesn’t appear, To power up

FAULT FINDING INTRAC-305

This fault finding guide goes no further than the replacement of the major assemblies such as power supply, IBR-L or complete printed circuit assemblies.

The INTRAC-305 consists of six major assemblies :-

	⎯	Main Interface PCB
	⎯	Processor PCB
	⎯ Low voltage power supply
	⎯	LCD Display panel
	⎯ Front panel keys assembly
	⎯	Beacon receiver (optional)
Note	The LCD display panel has a replaceable backlight which has
	a finite life span. This light will need replacing within the
	working life of the INTRAC-305. Included in this section are
	instructions on replacing the lamp.
FAULT SYMPTOMS
INTRAC doesn’t appear	Check that the main power-on switch glows green when
to power up	switched on. If not check INTRAC fuse, power cable and
	power source
Display screen blank/dark	Data is visible on screen but display is very dark.
	Try to adjust display brightness and contrast. Contrast
	adjustment has some effect but brightness has none.
	LCD backlight or its inverter has failed.
Note	To adjust brightness or contrast press menu keys 2 - 4 - 5
	followed by the Enter key. Menu key 4 will now control
	brightness and menu key 3 will control contrast.
	Display is bright but there is no data visible. Brightness
	control has some effect but contrast does not.
	Check power supply voltages :-
	⎯	V1 = +5v to com	)	Voltages should be
	⎯	V2 = +15v to com	)
				within 5% of stated
	⎯	V3 = 12v across + & −	)
				values
	⎯	V4 = 24v across + & −	)

If voltages are correct fault is with LCD, ribbon cable to J18 (Interface PCB) or the Interface PCB itself.

Replacing the LCD backlight	This section applies only to units fitted with a display with a
	fluorescent tube backlight (blue display). Some units may be
	fitted with a LED backlight display (grey display) which do not
	require replacement of the backlight.
	Remove the top cover from the INTRAC-305. The rear of the
	LCD panel is then visible.

Page 78 INTRAC-305 MANUAL - Issue 3.2 © 2011 Advantech Wireless