4 MAINTENANCE NOTES
4.1 REPLACEMENT OF THE BATTERY
li a battery check, as described in Section 2.2, shows that a replace-
ment is required proceed as follows :-
(l) Remove the formed plate fitted inside the cut-out in the rear case
panel by unscrewing the two captive 2 BA screws.
(2) Prize the two snap connectors off the battery.
(3) Slide out the old battery and fit a new one.
(4) Press on the snap connectors. When a similar standard 9 V battery
is used, EverReady type PP9 or Exide type DT9, the connectors can
only be fitted far the correct polarity. li, however, a non-standard
battery has to be used the connections must bave the same polarity
as far the originaI.
(5) Replace the plate, making sure the battery leads are not trapped.
~
4.2 REPLACEMENT OF CIRCUIT COMPONENTS
li the precautions and limita described in Section 2 are observed the
instrument should not require any maintenance other than the occasionaI
replacement of the battery. In the event of serious damage, however, the
instrument should be returned to our Service Department or nearest Area
office. (For addresses, see rear cover.)
The use of high stabiIity, close tolerance components has resulted
in the almost complete absence of preset components. Should a transistor
or some othe r component be damaged by a transient surge from an external
suppIy or by aver rating, then the subsequent replacement of the faulty
component may necessitate making one or more of the re-adjustments
given in this section.
4.2. l ACCESS TO INTERIOR
The main case assembly can be removed after unscrewing the cen-
trally Iocated Phillips-head screws that retain the rear case panel.
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