TM 11-6625-3053-14
SECTION V. TROUBLESHOOTING (FAULT LOCATION)
6-16.
This section contains a
troubleshooting table which will aid you in
isolating signal generator malfunctions due to
defective components. This table is based upon the signal generator check procedure in Section III and requires power
be turned ON inside the unit. You must exercise extreme care when making measurements inside an operating unit.
Observe all safety rules. Refer to para 1-14a, Safety, Care & Handling and Warning pages at the front of this manual.
6-17.
TROUBLESHOOTING TABLE.
You will observe that the troubleshooting table contains three columns. These are:
ITEM
The number in this column is keyed to a similar item in the CORRECTIVE ACTION
column of the electrical check procedure given in Section III or the alinement
procedure given in Section IV. It directs you to the applicable MALFUNCTION in
this table.
MALFUNCTION
This column lists the fault you have observed when performing the electrical check
or alinement.
CHECKS/
This column provides you with instructions to make additional checks
CORRECTIVE ACTION to components which you must replace. If a malfunction
or fault cannot be isolated to a single component, those components which may be
faulty are listed in order of most probable failure or their ease of replacement.
6-18.
PROCEDURE.
Proceed as follows to troubleshoot the signal generator.
Perform the checks or corrective action given in the CHECKS/CORRECTIVE ACTION column of the
troubleshooting table for any fault you observe during checkout.
Be sure to observe the sequence of checks or corrective actions as given.
Inspect components for signs of burning or other deterioration as an aid to fault location.
Before replacing a component, check associated wiring for breaks or shorts. Refer to the schematics
(Figure FO-2) and functional schematics contained in Section II, and the wiring diagrams contained at the
*
If broken wiring or poor connections are repaired, perform the check procedure to see if the repair you have made
has corrected the malfunction. You may not have to replace the component if wiring repairs have eliminated the
malfunction.
NOTE
If a DC voltage is to be measured, the troubleshooting procedure will first
mention the point of lower potential or closest to ground. For example, if the
instructions are to measure the voltage between test pin 11 and test pin 18 of
A2A2 card assy, the common or neutral probe will first be placed on pin 11,
and the active or voltage probe will be placed on pin 18.
6-47