Elenco Telephone Line Analyzer Kit - Manual (Page 13)

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When hung up, the telephone should have practically no effect on the telephone line.
6. If the meter is still not in the LINE OK area with all telephones unplugged, the problem is in the line. Recheck
and if necessary, remove and rewire any newly installed wires.
7. If the REVERSE POLARITY (REV POL) LED is on, the wires to the wall jack are reversed. The TT-400 will
read the line voltage correctly but some telephones may not work with the polarity reversed. If the telephone
does not work properly, reverse the wires to the wall jack to get the correct polarity.
8. When the TT-400 meter reads in the LINE OK area, pick up the telephone. The meter should drop to almost
zero. When the telephone is hung up, the meter should return to the LINE OK area.
RING TEST
A single telephone company ring source may ring telephones for many different subscribers. If the load is
heavy, the ring voltage may be temporarily low. If the meter does not read in the RING OK area during the ring
test, wait a while and repeat the test.
1. The ring test should be ran only after the line voltage reads in the LINE OK area. The test is run under the
same conditions as the LINE TEST, that is:
a) The switch on the TT-400 should be in the LINE/RING position.
b) The telephone should be hung up and plugged into the INPUT jack on the TT-400 (see Figure 10).
c) The TT-400 should be plugged into the wall jack. All other telephones on the same line should be hung up.
2. Have someone call you (you could also dial a ring back number if one is available). The ringing signal
consists of a 90VAC, 20 Hertz (cycles per second) signal superimposed on the 48VDC. This signal should
cause the meter to increase at least 1/8” into the RING OK area. If the meter was already in the RING OK
area, it should increase at least 1/8” further into the area. The needle will vibrate at 20 Hertz during the ring
signal.
3. If the meter increases 1/8” into the RING OK area and the telephone still does not ring, the telephone ringer
circuit is probably bad.
4. If the meter does not increase 1/8” into the RING OK area and the telephone does not ring the problem may
be due to excessive load on the ring signal. There should be a ringer equivalence number (REN) on each
telephone. The ringer equivalence number is a measure of how heavily the telephone loads the ring signal.
The total of the RENs of all the telephones on the line should be less than 5. If the total is 5 or greater, the
telephone are not guaranteed to ring. Unplug enough of the telephones to get the total REN below 5 and
repeat the test.
5. If the meter does not increase 1/8” into the RING OK area and the telephone does not ring when only one
telephone is on the line, the problem is either a bad ringer circuit in the telephone or a low ring voltage.
Unplug the telephone and repeat the test. If the meter now increases 1/8” into the RING OK area, the
telephone ringer circuit is probably bad. If the meter still does not increase into the RING OK area, the ring
voltage is most likely the problem. Before contacting the telephone company, carefully recheck all of the
newly installed wiring and correct if necessary.
6. If the meter reads in the “?” area, the ring voltage is marginal. Not every telephone will ring with this marginal
voltage.
LOOP TEST
If the LINE and RING test fail, the telephone line from the telephone company central office to your wall jack
may be at fault. The LOOP TEST checks that line.
1. Connect the TT-400 plug to the wall jack and set the switch to the LOOP position (see Figure 10).
2. Connect the telephone to the INPUT jack of the TT-400 and hang up the telephone. Be sure that all other