19
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
Possible cause
Refer to paragraph
On power up, I hear
relays click but there is
no visible display
Display contrast setting
3.8.2, 8.1, 8.1.2
On power up, I hear no
relays click nor do I get a
display
Power source or batteries 6.2, 6.3, 3.5, 8.2, if
available, try a second
power pack.
On power up, I see a
display, but there
appears to be no activity
Illegal instrument state
3.5 (hold ENTER key)
The display fills with a
faint blue rectangle and
nothing else happens
Bad power on condition
8.1.3
Unit gives bad readings
Cable nulling function is
in wrong state
3.12
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 3.8.2.
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
while the relays finish their activity.
Press the F2 key.
Press the ENTER key.
Press and hold either the FREQ up key or the WIDTH up key. A usable
display should soon appear.