In Case Of Trouble; Contrast; Environment And Contrast; Power On Preset Value If Contrast Was Lost - AEA VIA Bravo MRI Operating Manual

8 In Case of Trouble

Some problems may be identified and solved by the operator. More
involved problems will require factory service. To try to solve a problem
yourself, refer to the chart below:
Symptom
On power up, I hear
relays click but there is
no visible display
On power up, I hear no
relays click nor do I get a
display
On power up, I see a
display, but there
appears to be no activity
The display fills with a
faint blue rectangle and
nothing else happens
Unit gives bad readings

8.1 Contrast

8.1.1 Environment and Contrast

Occasionally, changes in temperature or ambient light conditions may necessitate
adjustment of the display contrast. Instructions may be found in section

8.1.2 Power On Preset Value if Contrast Was Lost

If the contrast has dropped so you cannot see the display then you can try the following
procedure. If you should accidentally push the wrong key, you will have to restart the
procedure.
Turn off unit, if there is a faint blue rectangle filling up most if the display then check
paragraph 8.1.3
Hold the ENTER key while you press the ON key. Wait a few seconds before releasing
the ENTER key. Wait a few more seconds while the relays finish their activity.
Press the F2 key.
Press the ENTER key.
Press and hold either the FREQ down key or the WIDTH down key. A usable display
should soon appear.
Possible cause
Display contrast setting
Power source
Illegal instrument state
Bad power on condition
Cable nulling function is
in wrong state
20
Refer to paragraph
3.8.2, 8.1, 8.1.2
6.2, 3.5, 8.2, if available,
try a second power pack.
3.5 (hold ENTER key)
8.1.3
3.12
3.8.2.