BIRD 4391A - Troubleshooting; General

Maintenance
20
Troubleshooting
General
The troubleshooting instructions are intended to aid in fault isolation. This is
accomplished through the use of a troubleshooting table.
First, locate the symptom(s) in the problem column of Table 7 . In some cases
the same fault can have more than one symptom and more than one possible
remedy. Compare the possible causes until you arrive at a suspected fault. Once
a fault has been isolated, repair or replace the defective components.
Note: Always recalibrate the RF Power Analyst after repairing the fault.
Table 7 - Trouble-shooting
PROBLEM POSSIBLE CAUSE REMEDY
Inaccurate power
readings
RF Power Analyst uncalibrated Recalibrate.
Defective Plug-in Elements Replace defective elements.
Intermittent connection at the
element wiper
Adjust the element wiper
contact.
Loose hold down catch
Readjust catch to hold element
securely in place.
Worn line section Replace line section.
Defect on Data Acquisition PC
board assembly
Replace the PC board assembly
(attached to line section).
High standing
waves
Dirty Connectors Clean the connectors.
Worn or damaged connectors Replace the connectors
Foreign objects in line section
Remove object from the line
section.
Short battery life
115/230V switch in wrong
position
Set 115/230V switch to correct
position.
Damaged/worn batteries Replace the batteries.
Will not operate
from AC line
115/230V switch in wrong
position
Set 115/230V switch to correct
position.
Blown fuse Replace blown fuse.
Defective line cord Repair or replace.
Display indicates
“0” Power
Element wiper not contacting
the element
Readjust the element wiper to
make good contact.
Defective Plug-in Element Replace Plug-In Element.
Defect on Data Acquisition PC
board assembly
Replace the PC board assembly
(attached to line section).