LESSON 3
TROUBLESHOOT A DEFECTIVE TELEPHONE SUBSTATION/LINE
1.
Types of troubles.
Most of the troubles that occur in substation equipment result from a failure or malfunction in any of the
four functions of the telephone set.
a. Signaling of the operator or seizing of automatic switching equipment.
b. Signaling of the telephone user.
c. Transmitting of the message.
d. Receiving of the message.
2.
Troubleshooting considerations.
a. Before beginning any troubleshooting procedure, investigate the effect of the following items
on the cause of the trouble--
(1) The type of service involved.
(2) The type of apparatus involved.
(3) The effect of the trouble on the telephone user's service.
(4) The weather conditions at the time the trouble was reported.
(5) The maintenance history of the equipment involved.
b. Before the repairman is sent to work on any equipment, certain procedures should have been
completed by the wire chief at the test desk.
(1) A transmission test to test the condition of the transmitter or receiver. This not always
possible since the wire could be broken.
(2) Test to locate the source of trouble as being definitely outside the central office.
c. Frequently several factors may cause an interruption or impairment of service. A logical
step-by-step procedure must be followed to localize and eliminate the sources of trouble. To eliminate
all sources of trouble, follow the troubleshooting procedures to completion, even if the source of trouble
has been
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