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ADJUSTMENT AND MAINTENANCE
The proper adjustments to insure correct oper
ation of this relay have been made at the factory
and should not be disturbed after receipt by the
customer. In particular, do not remove knob from
rheostat shaft and do not loosen potentiometer
lock nut.
ACCEPTANCE TEST
A timing check at minimum and maximum
settings is recommended to insure that the relay is
in proper working order. A recommended test cir
cuit is shown in Figure 5.
ROUTINE MAINTENANCE
All contacts should be cleaned periodically. A
contact burnisher S# 182A8 36 H0 1 is recommend
ed for this purpose. The use of abrasive material
for cleaning contacts is not recommended,
because of the danger of embedding small par
ticles in the face of the soft silver and thus im
pairing the contact.
6
-
-
-10
0
1 0
A MBIE NT
TE MPERATURE, IN DEGREES
4.
Fig.
Timing Variation with Temperature Changes.
UPP ER LIMIT
APPROXIMAT�-
LOWER LIMIT,
APPROXIMATE-
20
30
40
50
CENTIGRADE
TROUBLE SHOOTING PROCEDURE
Use the following procedure to locate the
source of trouble if the TD-5 unit is not operating
correctly.
1. Inspect all wires and connections, paying parti
cular attention to telephone relay and printed
circuit terminC'ls.
2. Check the reference voltage circuit. This is
done by measuring the de voltage across the
silicon power regulator,
voltmeter positive terminal to the rear terminal
Rs
of
and the negative terminal to relay ter
minal 8 or 18. Apply rated voltage per the
test circuit diagram, Figure 5. The Zener volt
age should be between 1 1.0 and 1 3 .0 volts for
2 4/ 3 2 volt relays, between 2 1.5 and 2 4.5 volts
for 48/ 125 volt relays, and between 50 and 58
volts for 2 50 volt relays.
3 . Check the timing capacitor voltage and the
potentiometer brush voltage (between printed
circuit terminal 3 and relay terminal 8 or 18)
with a cathode ray oscilloscope or a high re-
TYPICAL
-
70
60
18 7A526
z.
Connect the de
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.
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