AT&T Bell System 200 Series Maintenance

BELL SYSTEM PRACTICES
Plant Series
SECTION 502-300-300
Issue 1, Sep te mber , 1957
AT&TCo Standard
HAND TELEPHONE SETS - 200 SERIES
MAINTENANCE
1.00 INTRODUCTION .
This section covers the requirements and ad-
justing procedures for the maintenance of types A, B,
C, D, E, and G handset mountings of the 200 series
hand telephone sets.
2.00 GENERAL
2.01 Prior to proceeding with routine maintenance,
inspect th e exterior and interior of the hand
telephone set for loose, displaced, or broken parts and
determine if any such defects are responsible for the
trouble condition.
2.02 R eplace set if replacement parts are not avail-
able.
3.00 CONTACTS
ALIGNMENT
3.01
Point and disc contacts shall line up so that
the point fa lls wholly within the circumference
of the opposing contact disc ( see Fi g. 1 ) .
3 .02 Crossbar contacts sha ll lin e up so the width of
one falls wholly within the contact surface of
the other ( see
Fig. 1 ) .
I/ PO I N T
/OISC
I •~
' ftJ
I
I
Ji
FIG . I-P OINT AND DISC AND CROSSBAR CONTACTS
MARGINS
3.03 When the plunger is slowly re leased on types
A, B, D, and E mountings, no contacts shall
make or break until the plunger has raised at least
1/ 16 inch (see Fig.
2A).
3.04 On G-type mountings, the operating stud shall
not touch the operating springs when the
switchhook is in its extreme upward position ( see
Fig.
2B).
,
..
i6
FIG. 2A- TYPES A, B,
D,
AND
E
MOUNTING
MARGIN
FI G. 2B-G-TYPE MOUNTING MARGIN
Copyrirht, 1957, by American Telephone and Tele gra ph Company
Printed in U. S. A.
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