Ericsson DIALOG - Base Plate Construction and Features

Fig. 5
Onl 'Y one
screw
Ca se
3.1 Base pl ate
Fig. 6
The scr ew is well located
for the repairman
maintenance in the field can be carried out by semi-skilled staff,
with a minimum of tools and instruments. Only a screwdriver is
required to replace any unit (fig. 6). When necessary, repla c ed
units can be repaired at a central workshop where qualified staff,
tools, and instruments are available.
The DIALOG-case and handset are moulded in acrylate butadiene
styrene (ABS), and are manufactured in eight colours. The dyes
or pigments used for colouring have been chosen c arefully to
ensure colour-fastness. The plastic material offers an o ptimum
of hi gh impact- and scratch resistance and can easil y withstand
the effects of falling from one meter on to a hardwood floor .
The handset cradle is designed so that line disconnection is ensured
even when the handset is lightly or carelessly replaced.
Under the cradle and at a convenient distance from the handset ,
there is a carrying grip to facilitate the moving of the telephone
instrument. This execution is far superior to su ch t ype s wher e
extra arrangements have been added to the ca-se afterwards or
where metal handles have been fixed to the case by means of
screws.
The frame for the subs c riber number is fixed to the front of the
case, allowing both subscriber number and routing number , or
nam e of exchange, to be typed.
The base plate, shown in fig. 7 is made of sheet steel, zinc-electro-
plated with yellow c hromate coating and laquered . Unlike
L M Ericsson~ s e arlier telephone instruments, the base plate of
this instrument has raised edges to ensure hi gh mechanical
stability. The various units can then be keyed into the base plate
without affecting its mechanical strength, despite the fact that thin
metal is used. The base plate has four non-slip feet of neopren,
a durable, migration-free synthetic rubber, which hold the instru-
ment steady during dialling .
The slots in the base plate permit re g ulation of the ringer and
supply locking support for the various units to be mounted. At
7
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